Expansion Joints
\nThe flexible part of pipeline<\/strong><\/h2>\n\nEven quite simple piping systems needs expansion joints \u2013 to compensate the influence of thermal expansion, static and dynamic movements due to load changes, pressure surges and for damping vibrations and noise.These are very difficult tasks, that requires high flexibility, while the best possible strength and resistance against the internal factors (pressure, temperature, physical and chemical properties of the medium) and external factors (outdoor applications with huge temperature fluctuations and exposition to UV or heat radiation, salty moisture or flame) have to be assured. Additionally, the expansion joints are principally the integral parts of the installations and they have to provide possibly longest lifetime \u2013 even in continuous use \u2013 in heating installations, petrochemical installations or storage tanks. Apart from the requirements connected to durability, last but not least is the requirement of cleanliness \u2013 especially in the applications like transfer of potable water or foodstuffs.<\/p>\n<\/div>\n
<\/div>
<\/div>
\n<\/p>\nHow to choose the expansion joint?<\/strong><\/h2>\nMovements<\/h4>\n
The key is the type of allowed movements and their ranges, which have to be absorbed by the expansion joint, without the risk of damage. Depending on the direction we can define three basic types: axial (compression or expansion), lateral and angular. The manufacturers of expansion joints provides the specific limit values concerning their products. It has to be expressed, that apart from the designed directions of the movement, its dynamics has to be observed. Fast movements of high frequency \u2013 e.g. vibrations, even within the allowed range of movements can lead to quick wear of the expansion joint.<\/p>\n
![\"poktogramy_expansion_joints\"](\"http:\/\/ticon.pl\/wp-content\/uploads\/2015\/09\/poktogramy_expansion_joints.png\")
<\/p>\n
<\/p>\n
Parameters<\/h4>\n
As a classical selection criteria, the basic parameters of the application are valid:<\/p>\n
\n- chemical compatibility\/cleanliness,<\/li>\n
- pressure and vacuum,<\/li>\n
- temperature,<\/li>\n
- nominal diameter<\/li>\n<\/ul>\n
When selecting the expansion joint all external factors that are present in the place of installation have to be thoroughly taken into account. These can be the elevated temperature (as inside the engine chamber), risk of flame or the presence of a corrosive atmosphere. Some applications \u2013 in order to provide the highest safety \u2013 require exclusively specific products, certified by the notified bodies. The marine applications are an example.
\nIn many cases one of the primary criteria can be the installation length, while the required range of movements is assured.<\/p>\n
<\/p>\n
![\"piktogramy](\"http:\/\/ticon.pl\/wp-content\/uploads\/2015\/09\/piktogramy-kompensatory_ang2.png\")
<\/div>\n<\/div>\nIn terms of the construction materials we can choose between the expansion joints made of the rubber, metal sheet (single and multilayer) and PTFE. Every type can be equipped with the additional elements limiting the movements (tie rods).<\/div>\n<\/div>
<\/div>
\n<\/p>\nRubber expansion joints<\/strong><\/h2>\nRubber expansion joints provides large movement ranges, presents negligible inherent resistance and are very compact (short installation length). Thanks to wide range of available rubber compounds and reinforcement materials they can be applied for very different media. There is no risk of stress corrosion and fatigue due to vibration \u2013 while they are effectively dampening the noise and vibrations. They are also quite resistant against the external mechanical damage, e.g. by hitting. The mostly used are expansion joints with single bellow, reinforced with synthetic cord, with the rubber liner selected for the conveyed fluid.<\/p>\n
<\/div>\n![\"komp_erv_objasnienie_en\"](\"http:\/\/ticon.pl\/wp-content\/uploads\/2015\/09\/komp_erv_objasnienie_en.png\")
<\/div>\nThe single sphere type, synthetic cord reinforced rubber bellow with swiveling metal flanges is the most popular, widely used type.
\nFor some applications that requires an extra durability, longer lifetime and the flame resistance, the synthetic cord is replaced with the steel wire reinforcement.<\/div>\n\nOptions<\/h4>\n![\"ogranicznik\"](\"http:\/\/ticon.pl\/wp-content\/uploads\/2015\/08\/ogranicznik.png\")
<\/div>\n![\"ogranicznik2\"](\"http:\/\/ticon.pl\/wp-content\/uploads\/2015\/08\/ogranicznik2.png\")
<\/div>\nTie rods<\/strong>
\nUsed to secure the expansion joint against movement over allowed limit. There are tie rods with outer limitation, outer- and inner limitation and swivels for angular limitation.
\nZS<\/strong> – outer limiter<\/a>
\nZSS<\/strong> – inner and outer limiter<\/a>
\nRG<\/strong> – angular swivel<\/a><\/div>\n![\"pierscien\"](\"http:\/\/ticon.pl\/wp-content\/uploads\/2015\/08\/pierscien.png\")
<\/div>\n![\"pierscien2\"](\"http:\/\/ticon.pl\/wp-content\/uploads\/2015\/08\/pierscien2.png\")
<\/div>\nVacuum support<\/strong>
\nSpirals or rings protecting the bellow against collapsing in case of vacuum.
\nVSD<\/strong> – spiral<\/a>
\nVSR<\/strong> – ring<\/a>
\nVSRV<\/strong> – segmented ring<\/a>
\nTAS<\/strong> – PTFE ring<\/a><\/div>\n![\"wykladzina\"](\"http:\/\/ticon.pl\/wp-content\/uploads\/2015\/08\/wykladzina.png\")
<\/div>\n![\"wkladka\"](\"http:\/\/ticon.pl\/wp-content\/uploads\/2015\/08\/wkladka.png\")
<\/div>\nLinings and sleeves<\/strong>
\nPTFE lining is protecting the internal surface of the bellow against chemically aggressive medium. For the fluids containing abrasive particles – the metal sleeves are used.
\nSR<\/strong> – sleeve<\/a>
\nTA<\/strong> – lining<\/a><\/div>\n![\"oslona\"](\"http:\/\/ticon.pl\/wp-content\/uploads\/2015\/08\/oslona.png\")
<\/div>\n![\"oslona2\"](\"http:\/\/ticon.pl\/wp-content\/uploads\/2015\/08\/oslona2.png\")
<\/div>\nProtection covers<\/strong>
\nUsed to shield the expansion joint against high temperatur\u0119, flame, weather conditions and the sun.
\nFSH<\/strong> – Flame protection cover<\/a><\/div>\n<\/div>\n\nTECHNICAL INFORMATIONS<\/em><\/strong><\/h4>\n\n![\"infotech\"](\"http:\/\/ticon.pl\/wp-content\/uploads\/2015\/09\/infotech2.png\")
<\/div>\n\n- Check list – how to select the expansion joint?<\/a><\/li>\n
- Hints for pipework designers<\/a><\/li>\n
- Temperature influence on pressure and movement<\/a><\/li>\n
- Pressure Equipment Directive 97\/23\/EC<\/a><\/li>\n
- Overview of Certificates<\/a><\/li>\n<\/ul>\n<\/div>\n\n
![\"infotech2\"](\"http:\/\/ticon.pl\/wp-content\/uploads\/2015\/09\/infotech21.png\")
<\/p>\n
\n- Assembling instructions<\/a><\/li>\n
- Flanges – types and dimensions<\/a><\/li>\n<\/ul>\n<\/div>\n<\/div>\n\n
Rubber expansion joints types<\/h4>\nERV PRODUCT RANGE<\/h4>\n
ERV high quality expansion joints DN 25 -1000 by Elaflex\/ContiTech. With swiveling flanges ( various types and materials ). For detail information see Elaflex catalogue.
\n<\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV-R<\/h4>\n
RED BAND expansion joint for water, drinking water, waste water, seawater, cooling water, chemical waste water (without oil), chemicals, acids and alkalis, salt solutions, alcohols.
\nTemperature range
\n-40\u00b0 C up to 100\u00b0 C,
\ntemporarily up to 120\u00b0 C.
\nLining Butyl \/ EPDM.<\/p>\n<\/div>\n
<\/a><\/a><\/a><\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nROTEX<\/h4>\n
ROTEX expansion joint for permanent service with heating water, cooling water and hot air (without oil). W.P. 10 bar up to 100\u00b0 C, 6 bar up to 110\u00b0 C. Temperature range -40\u00b0 up to 130\u00b0 C, temporarily up to 150\u00b0 C.
\nT\u00dcV approved for heating
\ninstallations.
\nLining EPDM.<\/p>\n<\/div>\n
<\/a><\/a><\/a><\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV – CR<\/h4>\n
CR expansion joint for cold and warm water, seawater (also oil containing), various waste water, lube oils and greases, air, compressed air. Temperature range -25 \u00b0 C up to 90\u00b0 C, temporarily up to 100\u00b0 C.
\nLining Chloroprene.<\/p>\n<\/div>\n
<\/a><\/a><\/a><\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV – BR<\/h4>\n
BR expansion joint for abrasive media such as sludges, solid\/liquid mixtures, dustlike and pow- dery products. Temperature range -50\u00b0 C up to 70\u00b0 C, temporarily up to 90\u00b0 C.
\nLining BR\/NR.<\/p>\n<\/div>\n
<\/a><\/a><\/a><\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERP<\/h4>\n
RED SPOT expansion joint for sanitary facilities, cold \/ warm water, swimming pool water, sea- water, drinking water. Highly flexible + low own resistance. W.P. max. 10 bar. Temperature range -40\u00b0 C up to 90\u00b0 C,
\ntemporarily up to 120\u00b0 C.
\nLining Butyl \/ EPDM.<\/p>\n<\/div>\n
<\/a><\/a><\/a>
\n<\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV – G<\/h4>\n
YELLOW BAND expansion joint for petroleum based products up to 50 % aromatics, also town gas and natural gas, cooling water emul- sions with corrosion preventing oil. Temperature range -20\u00b0 C up to 90\u00b0 C,
\ntemporarily up to 100\u00b0 C.
\nLining NBR.<\/p>\n<\/div>\n
<\/a><\/a><\/a>
\n<\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV – GS<\/h4>\n
YELLOW STEEL expansion joint. Similar to type ERV-G, but fire resistant to ISO 15540 (type approved). Temperature range -20\u00b0 C up to 90\u00b0 C, temporarily up to 100\u00b0 C. Lining NBR.<\/p>\n<\/div>\n
<\/a><\/a><\/a>
\n<\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV – GS HNBR<\/h4>\n
YELLOW STEEL HBNR expansion joint for pe- troleum based products up to 50 % aromatics and hydraulic oil. Very good ageing, weathering and ozone resistance. Temperature range
\n-35 \u00b0 C up to 100\u00b0 C,
\ntemporarily up to 120\u00b0 C.
\nLining HNBR.<\/p>\n<\/div>\n
<\/a><\/a><\/a>
\n<\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV – G LT<\/h4>\n
YELLOW BAND LT expansion joint designed for low temperature applications for petroleum based products. Temperature range -40\u00b0 C up to 90\u00b0 C, temporarily up to 100\u00b0 C.
\nLining NBR.<\/p>\n<\/div>\n
<\/a><\/a><\/a>
\n<\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV – OR<\/h4>\n
ORANGE BAND expansion joint for Liquid Petroleum Gas (LPG) according to EN 589. temperature range -20\u00b0 C up to 90\u00b0 C. Working pressure 25 bar, burst pressure > 100 bar<\/p>\n<\/div>\n
<\/a><\/a><\/a>
\n<\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV – GR<\/h4>\n
GREEN BAND expansion joint for acids, alkalis, chemicals and aggressive chemical waste water. Temperature range -20\u00b0 C up to 100\u00b0 C, temporarily up to 110\u00b0 C. For oil contaminated compressor air
\nup to 90\u00b0 C. Lining CSM.<\/p>\n<\/div>\n
<\/a><\/a><\/a><\/p>\n<\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV – W<\/h4>\n
WHITE BAND expansion joint for foodstuffs, also oils and fat containing food. Liner conforms to German foodstuff regulations. Temperature range -20\u00b0 C up to 90\u00b0 C, temporarily up to
\n100\u00b0 C.
\nLining NBR, light grey.<\/p>\n<\/div>\n
<\/a><\/a><\/a><\/p>\n\nAccessories<\/h4>\n\n\n- Tie rods with outer limitation (… ZS),<\/li>\n
- Tie rods with inner and outer limitation (… ZSS),<\/li>\n
- Angular limiter ( … RG ),<\/li>\n
- Inner protection sleeve stainless steel (… SR),<\/li>\n
- PTFE liner ( … TA ),<\/li>\n
- PTFE liner and vacuum support ring (… TAS),<\/li>\n
- Vacuum support spiral stainless steel (… VSD),<\/li>\n<\/ul>\n<\/div>\n\n
\n- Vacuum support ring stainless steel (… VSR),<\/li>\n
- Bolted vacuum support ring stainless (… VSRV),<\/li>\n
- Flame protection cover ( … FSH ),<\/li>\n
- Flame protection cover Naval Standard (… FSH-M),<\/li>\n
- Earth Cover (… EAH).<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n
<\/div>
<\/div><\/p>\n<\/p>\nMetal expansion joints<\/strong><\/h2>\n\nThe metal expansion joints made from the corrugated metal sheet are traditional, and usually indispensable parts, of the pipeline. To reach the expected pressure resistance and retain the required elasticity they are usually made of multiple layers. The tubes made from a thin metal sheet are shaped with mechanical and hydraulic methods. The waves may have different profiles \u2013 suited to the needs. Multilayer construction enable the use of different materials, e.g. for inner and outer layer to achieve higher corrosion resistance the special alloys can be used. Additionally, such construction is more flexible than a single thicker metal sheet. Metal expansion joints are manufactured in the extremely wide range of diameters \u2013 from teens of millimeters up to several meters.<\/p>\n
![\"kompensator_stal_en\"](\"http:\/\/ticon.pl\/wp-content\/uploads\/2015\/09\/kompensator_stal_en.png\")
<\/p>\n
Differently than rubber expansion joints, which are always a separate part that could be disassembled, the metal ones are usually permanently welded to the pipeline or manufactured as multi-bellow sets, consisting of two or more bellows and additional parts provided to limit the movement to the defined planes and ranges, or more sophisticated designs that can compensate the reaction force arising from the internal pressure. Over time there have been developed many complete solutions using a waved metal bellows.<\/p>\n
The characteristic feature of the metal expansion joints is relatively high spring rate, so high, that it have to be considered in pipeline calculations. For that reason the manufacturers of the metal expansion joints specifies for their products not only the effective area, to calculate the reaction force aroused from the internal pressure, but also the spring rate dependent on the range of movement.<\/p>\n
Metal expansion joints are used for the extreme working conditions (temperature, pressure, chemical resistance) or extreme sizes (expansion joints of several meters of diameter for process technology \u2013 e.g. chemical reactors).<\/p>\n
Typical ranges:<\/p>\n
\n- DN from 15 \u2013 5000 mm,<\/li>\n
- PN from vacuum through pressure classes 1, 6, 10, 25, 40 up to 63 bar,<\/li>\n
- temperatures: -30\u00b0C up to 1200\u00b0C (standard material 1.4541 up to +550\u00b0C),<\/li>\n
- materials: bellows – usually 1.4541 (AISI 321) Other options see: Bellow Materials,<\/li>\n
- life cycles (designed life cycles): basic – 1.000 cycles \u2013 other \u2013 upon demand,<\/li>\n
- media examples: air, exhaust, water, steam, mineral oils and fuels, liquid gases etc.<\/li>\n<\/ul>\n
Metal expansion joints are mostly designed according to the standards defined by E.J.M.A (Expansion Joint Manufacturers Association, Inc.), which specifies the methods to calculate the strength of bellows for number of different load types. Actually valid is 9-th edition of this standard \u2013 EJMA 9. Metal expansion joints are also specified by European Norm EN 14917.<\/p>\n<\/div>\n
\nMetal expansion joints types<\/h4>\n![\"ss1\"](\"http:\/\/ticon.pl\/wp-content\/uploads\/2015\/09\/ss11.png\")
<\/a><\/div>\n![\"ss1a\"](\"http:\/\/ticon.pl\/wp-content\/uploads\/2015\/09\/ss1a.png\")
<\/a><\/div>\nSingle bellow (axial)<\/strong>
\nCapable to absorb axial movements, small lateral and angular, vibration and combined movements in a single plane.
\nEconomic, but with limited pressure capabilities, require proper anchoring and guiding.<\/div>\n![\"ss2\"](\"http:\/\/ticon.pl\/wp-content\/uploads\/2015\/09\/ss21.png\")
<\/a><\/div>\n![\"ss2a\"](\"http:\/\/ticon.pl\/wp-content\/uploads\/2015\/09\/ss2a.png\")
<\/a><\/div>\nUniversal (lateral)<\/strong>
\nAllow lateral movements in any direction. Consist of two bellows connected with the tube.
\nUsually equipped with tie rods to control the pressure thrust, so there is no need for anchor.<\/div>\n![\"ss3\"](\"http:\/\/ticon.pl\/wp-content\/uploads\/2015\/09\/ss3.png\")
<\/a><\/div>\n![\"ss3a\"](\"http:\/\/ticon.pl\/wp-content\/uploads\/2015\/09\/ss3a.png\")
<\/a><\/div>\nUniversal swing<\/strong>
\nCan absorb large lateral and angular movements in one plane due to swing bars with pins near ends of the unit.<\/div>\n![\"ss4\"](\"http:\/\/ticon.pl\/wp-content\/uploads\/2015\/09\/ss4.png\")
<\/a><\/div>\n![\"ss4a\"](\"http:\/\/ticon.pl\/wp-content\/uploads\/2015\/09\/ss4a.png\")
<\/a><\/div>\nHinged (angular)<\/strong>
\nAllows only angular movements in one plane.
\nAs the bars are permanently fixed on both ends, the pressure thrust form the bellow is not transmitted to the pipeline. Usually used in pairs on more pieces.<\/div>\n![\"ss5\"](\"http:\/\/ticon.pl\/wp-content\/uploads\/2015\/09\/ss5.png\")
<\/a><\/div>\n![\"ss5a\"](\"http:\/\/ticon.pl\/wp-content\/uploads\/2015\/09\/ss5a.png\")
<\/a><\/div>\nGimbal<\/strong>
\nAllow to angle in any plane thanks to the pair of two hinges fixed to the common floating ring located centrally.
\nPressure thrust from the bellow is not transmitted to the pipeline as the swing bars are permanently fixed at both ends.<\/div>\n\nApart from the above listed standard configurations, there are many solutions of expansion joints designed as the integral units, e.g. with the internal compensation of the pressure thrust, that eliminates need for anchoring or externally pressurized bellows designed to eliminate squirm problem at high pressures.<\/p>\n
Usually, there are very specific and different solutions designed to solve the specific application problems. Do not hesitate contacting our sale team for special items.<\/p>\n<\/div>\n
\nOptions<\/h4>\n![\"ograniczniki2\"](\"http:\/\/ticon.pl\/wp-content\/uploads\/2015\/09\/ograniczniki2.png\")
<\/a><\/div>\n![\"ograniczniki\"](\"http:\/\/ticon.pl\/wp-content\/uploads\/2015\/09\/ograniczniki.png\")
<\/a><\/div>\nTie rods<\/strong>
\nUsed to secure the expansion joint against over extension and\/or over compression. In the normal working conditions they have no influence on working expansion joint.<\/div>\n![\"wk\u0142adka\"](\"http:\/\/ticon.pl\/wp-content\/uploads\/2015\/09\/wk\u0142adka.png\")
<\/a><\/div>\n![\"wk\u0142adka2\"](\"http:\/\/ticon.pl\/wp-content\/uploads\/2015\/09\/wk\u0142adka2.png\")
<\/a><\/div>\nInner sleeves<\/strong>
\nUsed to minimize turbulences of the fluid passing through and reduce the creation of vibrations, to secure metal bellow form erosion when the fluid contains solid particles or reduce direct influence of the high temperature. During installation, the flow direction should be observed.<\/div>\n![\"oslona\"](\"http:\/\/ticon.pl\/wp-content\/uploads\/2015\/09\/oslona.png\")
<\/a><\/div>\n
Even quite simple piping systems needs expansion joints \u2013 to compensate the influence of thermal expansion, static and dynamic movements due to load changes, pressure surges and for damping vibrations and noise.These are very difficult tasks, that requires high flexibility, while the best possible strength and resistance against the internal factors (pressure, temperature, physical and chemical properties of the medium) and external factors (outdoor applications with huge temperature fluctuations and exposition to UV or heat radiation, salty moisture or flame) have to be assured. Additionally, the expansion joints are principally the integral parts of the installations and they have to provide possibly longest lifetime \u2013 even in continuous use \u2013 in heating installations, petrochemical installations or storage tanks. Apart from the requirements connected to durability, last but not least is the requirement of cleanliness \u2013 especially in the applications like transfer of potable water or foodstuffs.<\/p>\n<\/div>\n
<\/div>
\n
How to choose the expansion joint?<\/strong><\/h2>\nMovements<\/h4>\n
The key is the type of allowed movements and their ranges, which have to be absorbed by the expansion joint, without the risk of damage. Depending on the direction we can define three basic types: axial (compression or expansion), lateral and angular. The manufacturers of expansion joints provides the specific limit values concerning their products. It has to be expressed, that apart from the designed directions of the movement, its dynamics has to be observed. Fast movements of high frequency \u2013 e.g. vibrations, even within the allowed range of movements can lead to quick wear of the expansion joint.<\/p>\n
<\/p>\n
<\/p>\n
Parameters<\/h4>\n
As a classical selection criteria, the basic parameters of the application are valid:<\/p>\n
\n- chemical compatibility\/cleanliness,<\/li>\n
- pressure and vacuum,<\/li>\n
- temperature,<\/li>\n
- nominal diameter<\/li>\n<\/ul>\n
When selecting the expansion joint all external factors that are present in the place of installation have to be thoroughly taken into account. These can be the elevated temperature (as inside the engine chamber), risk of flame or the presence of a corrosive atmosphere. Some applications \u2013 in order to provide the highest safety \u2013 require exclusively specific products, certified by the notified bodies. The marine applications are an example.
\nIn many cases one of the primary criteria can be the installation length, while the required range of movements is assured.<\/p>\n
<\/p>\n
<\/div>\n<\/div>\nIn terms of the construction materials we can choose between the expansion joints made of the rubber, metal sheet (single and multilayer) and PTFE. Every type can be equipped with the additional elements limiting the movements (tie rods).<\/div>\n<\/div>
<\/div>
\n<\/p>\nRubber expansion joints<\/strong><\/h2>\nRubber expansion joints provides large movement ranges, presents negligible inherent resistance and are very compact (short installation length). Thanks to wide range of available rubber compounds and reinforcement materials they can be applied for very different media. There is no risk of stress corrosion and fatigue due to vibration \u2013 while they are effectively dampening the noise and vibrations. They are also quite resistant against the external mechanical damage, e.g. by hitting. The mostly used are expansion joints with single bellow, reinforced with synthetic cord, with the rubber liner selected for the conveyed fluid.<\/p>\n
<\/div>\n<\/div>\nThe single sphere type, synthetic cord reinforced rubber bellow with swiveling metal flanges is the most popular, widely used type.
\nFor some applications that requires an extra durability, longer lifetime and the flame resistance, the synthetic cord is replaced with the steel wire reinforcement.<\/div>\n\nOptions<\/h4>\n<\/div>\n<\/div>\nTie rods<\/strong>
\nUsed to secure the expansion joint against movement over allowed limit. There are tie rods with outer limitation, outer- and inner limitation and swivels for angular limitation.
\nZS<\/strong> – outer limiter<\/a>
\nZSS<\/strong> – inner and outer limiter<\/a>
\nRG<\/strong> – angular swivel<\/a><\/div>\n<\/div>\n<\/div>\nVacuum support<\/strong>
\nSpirals or rings protecting the bellow against collapsing in case of vacuum.
\nVSD<\/strong> – spiral<\/a>
\nVSR<\/strong> – ring<\/a>
\nVSRV<\/strong> – segmented ring<\/a>
\nTAS<\/strong> – PTFE ring<\/a><\/div>\n<\/div>\n<\/div>\nLinings and sleeves<\/strong>
\nPTFE lining is protecting the internal surface of the bellow against chemically aggressive medium. For the fluids containing abrasive particles – the metal sleeves are used.
\nSR<\/strong> – sleeve<\/a>
\nTA<\/strong> – lining<\/a><\/div>\n<\/div>\n<\/div>\nProtection covers<\/strong>
\nUsed to shield the expansion joint against high temperatur\u0119, flame, weather conditions and the sun.
\nFSH<\/strong> – Flame protection cover<\/a><\/div>\n<\/div>\n\nTECHNICAL INFORMATIONS<\/em><\/strong><\/h4>\n\n<\/div>\n\n- Check list – how to select the expansion joint?<\/a><\/li>\n
- Hints for pipework designers<\/a><\/li>\n
- Temperature influence on pressure and movement<\/a><\/li>\n
- Pressure Equipment Directive 97\/23\/EC<\/a><\/li>\n
- Overview of Certificates<\/a><\/li>\n<\/ul>\n<\/div>\n\n
<\/p>\n
\n- Assembling instructions<\/a><\/li>\n
- Flanges – types and dimensions<\/a><\/li>\n<\/ul>\n<\/div>\n<\/div>\n\n
Rubber expansion joints types<\/h4>\nERV PRODUCT RANGE<\/h4>\n
ERV high quality expansion joints DN 25 -1000 by Elaflex\/ContiTech. With swiveling flanges ( various types and materials ). For detail information see Elaflex catalogue.
\n<\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV-R<\/h4>\n
RED BAND expansion joint for water, drinking water, waste water, seawater, cooling water, chemical waste water (without oil), chemicals, acids and alkalis, salt solutions, alcohols.
\nTemperature range
\n-40\u00b0 C up to 100\u00b0 C,
\ntemporarily up to 120\u00b0 C.
\nLining Butyl \/ EPDM.<\/p>\n<\/div>\n
<\/a><\/a><\/a><\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nROTEX<\/h4>\n
ROTEX expansion joint for permanent service with heating water, cooling water and hot air (without oil). W.P. 10 bar up to 100\u00b0 C, 6 bar up to 110\u00b0 C. Temperature range -40\u00b0 up to 130\u00b0 C, temporarily up to 150\u00b0 C.
\nT\u00dcV approved for heating
\ninstallations.
\nLining EPDM.<\/p>\n<\/div>\n
<\/a><\/a><\/a><\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV – CR<\/h4>\n
CR expansion joint for cold and warm water, seawater (also oil containing), various waste water, lube oils and greases, air, compressed air. Temperature range -25 \u00b0 C up to 90\u00b0 C, temporarily up to 100\u00b0 C.
\nLining Chloroprene.<\/p>\n<\/div>\n
<\/a><\/a><\/a><\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV – BR<\/h4>\n
BR expansion joint for abrasive media such as sludges, solid\/liquid mixtures, dustlike and pow- dery products. Temperature range -50\u00b0 C up to 70\u00b0 C, temporarily up to 90\u00b0 C.
\nLining BR\/NR.<\/p>\n<\/div>\n
<\/a><\/a><\/a><\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERP<\/h4>\n
RED SPOT expansion joint for sanitary facilities, cold \/ warm water, swimming pool water, sea- water, drinking water. Highly flexible + low own resistance. W.P. max. 10 bar. Temperature range -40\u00b0 C up to 90\u00b0 C,
\ntemporarily up to 120\u00b0 C.
\nLining Butyl \/ EPDM.<\/p>\n<\/div>\n
<\/a><\/a><\/a>
\n<\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV – G<\/h4>\n
YELLOW BAND expansion joint for petroleum based products up to 50 % aromatics, also town gas and natural gas, cooling water emul- sions with corrosion preventing oil. Temperature range -20\u00b0 C up to 90\u00b0 C,
\ntemporarily up to 100\u00b0 C.
\nLining NBR.<\/p>\n<\/div>\n
<\/a><\/a><\/a>
\n<\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV – GS<\/h4>\n
YELLOW STEEL expansion joint. Similar to type ERV-G, but fire resistant to ISO 15540 (type approved). Temperature range -20\u00b0 C up to 90\u00b0 C, temporarily up to 100\u00b0 C. Lining NBR.<\/p>\n<\/div>\n
<\/a><\/a><\/a>
\n<\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV – GS HNBR<\/h4>\n
YELLOW STEEL HBNR expansion joint for pe- troleum based products up to 50 % aromatics and hydraulic oil. Very good ageing, weathering and ozone resistance. Temperature range
\n-35 \u00b0 C up to 100\u00b0 C,
\ntemporarily up to 120\u00b0 C.
\nLining HNBR.<\/p>\n<\/div>\n
<\/a><\/a><\/a>
\n<\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV – G LT<\/h4>\n
YELLOW BAND LT expansion joint designed for low temperature applications for petroleum based products. Temperature range -40\u00b0 C up to 90\u00b0 C, temporarily up to 100\u00b0 C.
\nLining NBR.<\/p>\n<\/div>\n
<\/a><\/a><\/a>
\n<\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV – OR<\/h4>\n
ORANGE BAND expansion joint for Liquid Petroleum Gas (LPG) according to EN 589. temperature range -20\u00b0 C up to 90\u00b0 C. Working pressure 25 bar, burst pressure > 100 bar<\/p>\n<\/div>\n
<\/a><\/a><\/a>
\n<\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV – GR<\/h4>\n
GREEN BAND expansion joint for acids, alkalis, chemicals and aggressive chemical waste water. Temperature range -20\u00b0 C up to 100\u00b0 C, temporarily up to 110\u00b0 C. For oil contaminated compressor air
\nup to 90\u00b0 C. Lining CSM.<\/p>\n<\/div>\n
<\/a><\/a><\/a><\/p>\n<\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV – W<\/h4>\n
WHITE BAND expansion joint for foodstuffs, also oils and fat containing food. Liner conforms to German foodstuff regulations. Temperature range -20\u00b0 C up to 90\u00b0 C, temporarily up to
\n100\u00b0 C.
\nLining NBR, light grey.<\/p>\n<\/div>\n
<\/a><\/a><\/a><\/p>\n\nAccessories<\/h4>\n\n\n- Tie rods with outer limitation (… ZS),<\/li>\n
- Tie rods with inner and outer limitation (… ZSS),<\/li>\n
- Angular limiter ( … RG ),<\/li>\n
- Inner protection sleeve stainless steel (… SR),<\/li>\n
- PTFE liner ( … TA ),<\/li>\n
- PTFE liner and vacuum support ring (… TAS),<\/li>\n
- Vacuum support spiral stainless steel (… VSD),<\/li>\n<\/ul>\n<\/div>\n\n
\n- Vacuum support ring stainless steel (… VSR),<\/li>\n
- Bolted vacuum support ring stainless (… VSRV),<\/li>\n
- Flame protection cover ( … FSH ),<\/li>\n
- Flame protection cover Naval Standard (… FSH-M),<\/li>\n
- Earth Cover (… EAH).<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n
<\/div>
<\/div><\/p>\n<\/p>\nMetal expansion joints<\/strong><\/h2>\n\nThe metal expansion joints made from the corrugated metal sheet are traditional, and usually indispensable parts, of the pipeline. To reach the expected pressure resistance and retain the required elasticity they are usually made of multiple layers. The tubes made from a thin metal sheet are shaped with mechanical and hydraulic methods. The waves may have different profiles \u2013 suited to the needs. Multilayer construction enable the use of different materials, e.g. for inner and outer layer to achieve higher corrosion resistance the special alloys can be used. Additionally, such construction is more flexible than a single thicker metal sheet. Metal expansion joints are manufactured in the extremely wide range of diameters \u2013 from teens of millimeters up to several meters.<\/p>\n
<\/p>\n
Differently than rubber expansion joints, which are always a separate part that could be disassembled, the metal ones are usually permanently welded to the pipeline or manufactured as multi-bellow sets, consisting of two or more bellows and additional parts provided to limit the movement to the defined planes and ranges, or more sophisticated designs that can compensate the reaction force arising from the internal pressure. Over time there have been developed many complete solutions using a waved metal bellows.<\/p>\n
The characteristic feature of the metal expansion joints is relatively high spring rate, so high, that it have to be considered in pipeline calculations. For that reason the manufacturers of the metal expansion joints specifies for their products not only the effective area, to calculate the reaction force aroused from the internal pressure, but also the spring rate dependent on the range of movement.<\/p>\n
Metal expansion joints are used for the extreme working conditions (temperature, pressure, chemical resistance) or extreme sizes (expansion joints of several meters of diameter for process technology \u2013 e.g. chemical reactors).<\/p>\n
Typical ranges:<\/p>\n
\n- DN from 15 \u2013 5000 mm,<\/li>\n
- PN from vacuum through pressure classes 1, 6, 10, 25, 40 up to 63 bar,<\/li>\n
- temperatures: -30\u00b0C up to 1200\u00b0C (standard material 1.4541 up to +550\u00b0C),<\/li>\n
- materials: bellows – usually 1.4541 (AISI 321) Other options see: Bellow Materials,<\/li>\n
- life cycles (designed life cycles): basic – 1.000 cycles \u2013 other \u2013 upon demand,<\/li>\n
- media examples: air, exhaust, water, steam, mineral oils and fuels, liquid gases etc.<\/li>\n<\/ul>\n
Metal expansion joints are mostly designed according to the standards defined by E.J.M.A (Expansion Joint Manufacturers Association, Inc.), which specifies the methods to calculate the strength of bellows for number of different load types. Actually valid is 9-th edition of this standard \u2013 EJMA 9. Metal expansion joints are also specified by European Norm EN 14917.<\/p>\n<\/div>\n
\nMetal expansion joints types<\/h4>\n<\/a><\/div>\n<\/a><\/div>\nSingle bellow (axial)<\/strong>
\nCapable to absorb axial movements, small lateral and angular, vibration and combined movements in a single plane.
\nEconomic, but with limited pressure capabilities, require proper anchoring and guiding.<\/div>\n<\/a><\/div>\n<\/a><\/div>\nUniversal (lateral)<\/strong>
\nAllow lateral movements in any direction. Consist of two bellows connected with the tube.
\nUsually equipped with tie rods to control the pressure thrust, so there is no need for anchor.<\/div>\n<\/a><\/div>\n<\/a><\/div>\nUniversal swing<\/strong>
\nCan absorb large lateral and angular movements in one plane due to swing bars with pins near ends of the unit.<\/div>\n<\/a><\/div>\n<\/a><\/div>\nHinged (angular)<\/strong>
\nAllows only angular movements in one plane.
\nAs the bars are permanently fixed on both ends, the pressure thrust form the bellow is not transmitted to the pipeline. Usually used in pairs on more pieces.<\/div>\n<\/a><\/div>\n<\/a><\/div>\nGimbal<\/strong>
\nAllow to angle in any plane thanks to the pair of two hinges fixed to the common floating ring located centrally.
\nPressure thrust from the bellow is not transmitted to the pipeline as the swing bars are permanently fixed at both ends.<\/div>\n\nApart from the above listed standard configurations, there are many solutions of expansion joints designed as the integral units, e.g. with the internal compensation of the pressure thrust, that eliminates need for anchoring or externally pressurized bellows designed to eliminate squirm problem at high pressures.<\/p>\n
Usually, there are very specific and different solutions designed to solve the specific application problems. Do not hesitate contacting our sale team for special items.<\/p>\n<\/div>\n
\nOptions<\/h4>\n<\/a><\/div>\n<\/a><\/div>\nTie rods<\/strong>
\nUsed to secure the expansion joint against over extension and\/or over compression. In the normal working conditions they have no influence on working expansion joint.<\/div>\n<\/a><\/div>\n<\/a><\/div>\nInner sleeves<\/strong>
\nUsed to minimize turbulences of the fluid passing through and reduce the creation of vibrations, to secure metal bellow form erosion when the fluid contains solid particles or reduce direct influence of the high temperature. During installation, the flow direction should be observed.<\/div>\n<\/a><\/div>\n
<\/p>\nWhen selecting the expansion joint all external factors that are present in the place of installation have to be thoroughly taken into account. These can be the elevated temperature (as inside the engine chamber), risk of flame or the presence of a corrosive atmosphere. Some applications \u2013 in order to provide the highest safety \u2013 require exclusively specific products, certified by the notified bodies. The marine applications are an example.
\nIn many cases one of the primary criteria can be the installation length, while the required range of movements is assured.<\/p>\n
<\/p>\n
<\/div>\n<\/div>
\n
Rubber expansion joints<\/strong><\/h2>\nRubber expansion joints provides large movement ranges, presents negligible inherent resistance and are very compact (short installation length). Thanks to wide range of available rubber compounds and reinforcement materials they can be applied for very different media. There is no risk of stress corrosion and fatigue due to vibration \u2013 while they are effectively dampening the noise and vibrations. They are also quite resistant against the external mechanical damage, e.g. by hitting. The mostly used are expansion joints with single bellow, reinforced with synthetic cord, with the rubber liner selected for the conveyed fluid.<\/p>\n
<\/div>\n<\/div>\nThe single sphere type, synthetic cord reinforced rubber bellow with swiveling metal flanges is the most popular, widely used type.
\nFor some applications that requires an extra durability, longer lifetime and the flame resistance, the synthetic cord is replaced with the steel wire reinforcement.<\/div>\n\nOptions<\/h4>\n<\/div>\n<\/div>\nTie rods<\/strong>
\nUsed to secure the expansion joint against movement over allowed limit. There are tie rods with outer limitation, outer- and inner limitation and swivels for angular limitation.
\nZS<\/strong> – outer limiter<\/a>
\nZSS<\/strong> – inner and outer limiter<\/a>
\nRG<\/strong> – angular swivel<\/a><\/div>\n<\/div>\n<\/div>\nVacuum support<\/strong>
\nSpirals or rings protecting the bellow against collapsing in case of vacuum.
\nVSD<\/strong> – spiral<\/a>
\nVSR<\/strong> – ring<\/a>
\nVSRV<\/strong> – segmented ring<\/a>
\nTAS<\/strong> – PTFE ring<\/a><\/div>\n<\/div>\n<\/div>\nLinings and sleeves<\/strong>
\nPTFE lining is protecting the internal surface of the bellow against chemically aggressive medium. For the fluids containing abrasive particles – the metal sleeves are used.
\nSR<\/strong> – sleeve<\/a>
\nTA<\/strong> – lining<\/a><\/div>\n<\/div>\n<\/div>\nProtection covers<\/strong>
\nUsed to shield the expansion joint against high temperatur\u0119, flame, weather conditions and the sun.
\nFSH<\/strong> – Flame protection cover<\/a><\/div>\n<\/div>\n\nTECHNICAL INFORMATIONS<\/em><\/strong><\/h4>\n\n<\/div>\n\n- Check list – how to select the expansion joint?<\/a><\/li>\n
- Hints for pipework designers<\/a><\/li>\n
- Temperature influence on pressure and movement<\/a><\/li>\n
- Pressure Equipment Directive 97\/23\/EC<\/a><\/li>\n
- Overview of Certificates<\/a><\/li>\n<\/ul>\n<\/div>\n\n
<\/p>\n
\n- Assembling instructions<\/a><\/li>\n
- Flanges – types and dimensions<\/a><\/li>\n<\/ul>\n<\/div>\n<\/div>\n\n
Rubber expansion joints types<\/h4>\nERV PRODUCT RANGE<\/h4>\n
ERV high quality expansion joints DN 25 -1000 by Elaflex\/ContiTech. With swiveling flanges ( various types and materials ). For detail information see Elaflex catalogue.
\n<\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV-R<\/h4>\n
RED BAND expansion joint for water, drinking water, waste water, seawater, cooling water, chemical waste water (without oil), chemicals, acids and alkalis, salt solutions, alcohols.
\nTemperature range
\n-40\u00b0 C up to 100\u00b0 C,
\ntemporarily up to 120\u00b0 C.
\nLining Butyl \/ EPDM.<\/p>\n<\/div>\n
<\/a><\/a><\/a><\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nROTEX<\/h4>\n
ROTEX expansion joint for permanent service with heating water, cooling water and hot air (without oil). W.P. 10 bar up to 100\u00b0 C, 6 bar up to 110\u00b0 C. Temperature range -40\u00b0 up to 130\u00b0 C, temporarily up to 150\u00b0 C.
\nT\u00dcV approved for heating
\ninstallations.
\nLining EPDM.<\/p>\n<\/div>\n
<\/a><\/a><\/a><\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV – CR<\/h4>\n
CR expansion joint for cold and warm water, seawater (also oil containing), various waste water, lube oils and greases, air, compressed air. Temperature range -25 \u00b0 C up to 90\u00b0 C, temporarily up to 100\u00b0 C.
\nLining Chloroprene.<\/p>\n<\/div>\n
<\/a><\/a><\/a><\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV – BR<\/h4>\n
BR expansion joint for abrasive media such as sludges, solid\/liquid mixtures, dustlike and pow- dery products. Temperature range -50\u00b0 C up to 70\u00b0 C, temporarily up to 90\u00b0 C.
\nLining BR\/NR.<\/p>\n<\/div>\n
<\/a><\/a><\/a><\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERP<\/h4>\n
RED SPOT expansion joint for sanitary facilities, cold \/ warm water, swimming pool water, sea- water, drinking water. Highly flexible + low own resistance. W.P. max. 10 bar. Temperature range -40\u00b0 C up to 90\u00b0 C,
\ntemporarily up to 120\u00b0 C.
\nLining Butyl \/ EPDM.<\/p>\n<\/div>\n
<\/a><\/a><\/a>
\n<\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV – G<\/h4>\n
YELLOW BAND expansion joint for petroleum based products up to 50 % aromatics, also town gas and natural gas, cooling water emul- sions with corrosion preventing oil. Temperature range -20\u00b0 C up to 90\u00b0 C,
\ntemporarily up to 100\u00b0 C.
\nLining NBR.<\/p>\n<\/div>\n
<\/a><\/a><\/a>
\n<\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV – GS<\/h4>\n
YELLOW STEEL expansion joint. Similar to type ERV-G, but fire resistant to ISO 15540 (type approved). Temperature range -20\u00b0 C up to 90\u00b0 C, temporarily up to 100\u00b0 C. Lining NBR.<\/p>\n<\/div>\n
<\/a><\/a><\/a>
\n<\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV – GS HNBR<\/h4>\n
YELLOW STEEL HBNR expansion joint for pe- troleum based products up to 50 % aromatics and hydraulic oil. Very good ageing, weathering and ozone resistance. Temperature range
\n-35 \u00b0 C up to 100\u00b0 C,
\ntemporarily up to 120\u00b0 C.
\nLining HNBR.<\/p>\n<\/div>\n
<\/a><\/a><\/a>
\n<\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV – G LT<\/h4>\n
YELLOW BAND LT expansion joint designed for low temperature applications for petroleum based products. Temperature range -40\u00b0 C up to 90\u00b0 C, temporarily up to 100\u00b0 C.
\nLining NBR.<\/p>\n<\/div>\n
<\/a><\/a><\/a>
\n<\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV – OR<\/h4>\n
ORANGE BAND expansion joint for Liquid Petroleum Gas (LPG) according to EN 589. temperature range -20\u00b0 C up to 90\u00b0 C. Working pressure 25 bar, burst pressure > 100 bar<\/p>\n<\/div>\n
<\/a><\/a><\/a>
\n<\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV – GR<\/h4>\n
GREEN BAND expansion joint for acids, alkalis, chemicals and aggressive chemical waste water. Temperature range -20\u00b0 C up to 100\u00b0 C, temporarily up to 110\u00b0 C. For oil contaminated compressor air
\nup to 90\u00b0 C. Lining CSM.<\/p>\n<\/div>\n
<\/a><\/a><\/a><\/p>\n<\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV – W<\/h4>\n
WHITE BAND expansion joint for foodstuffs, also oils and fat containing food. Liner conforms to German foodstuff regulations. Temperature range -20\u00b0 C up to 90\u00b0 C, temporarily up to
\n100\u00b0 C.
\nLining NBR, light grey.<\/p>\n<\/div>\n
<\/a><\/a><\/a><\/p>\n\nAccessories<\/h4>\n\n\n- Tie rods with outer limitation (… ZS),<\/li>\n
- Tie rods with inner and outer limitation (… ZSS),<\/li>\n
- Angular limiter ( … RG ),<\/li>\n
- Inner protection sleeve stainless steel (… SR),<\/li>\n
- PTFE liner ( … TA ),<\/li>\n
- PTFE liner and vacuum support ring (… TAS),<\/li>\n
- Vacuum support spiral stainless steel (… VSD),<\/li>\n<\/ul>\n<\/div>\n\n
\n- Vacuum support ring stainless steel (… VSR),<\/li>\n
- Bolted vacuum support ring stainless (… VSRV),<\/li>\n
- Flame protection cover ( … FSH ),<\/li>\n
- Flame protection cover Naval Standard (… FSH-M),<\/li>\n
- Earth Cover (… EAH).<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n
<\/div>
<\/div><\/p>\n<\/p>\nMetal expansion joints<\/strong><\/h2>\n\nThe metal expansion joints made from the corrugated metal sheet are traditional, and usually indispensable parts, of the pipeline. To reach the expected pressure resistance and retain the required elasticity they are usually made of multiple layers. The tubes made from a thin metal sheet are shaped with mechanical and hydraulic methods. The waves may have different profiles \u2013 suited to the needs. Multilayer construction enable the use of different materials, e.g. for inner and outer layer to achieve higher corrosion resistance the special alloys can be used. Additionally, such construction is more flexible than a single thicker metal sheet. Metal expansion joints are manufactured in the extremely wide range of diameters \u2013 from teens of millimeters up to several meters.<\/p>\n
<\/p>\n
Differently than rubber expansion joints, which are always a separate part that could be disassembled, the metal ones are usually permanently welded to the pipeline or manufactured as multi-bellow sets, consisting of two or more bellows and additional parts provided to limit the movement to the defined planes and ranges, or more sophisticated designs that can compensate the reaction force arising from the internal pressure. Over time there have been developed many complete solutions using a waved metal bellows.<\/p>\n
The characteristic feature of the metal expansion joints is relatively high spring rate, so high, that it have to be considered in pipeline calculations. For that reason the manufacturers of the metal expansion joints specifies for their products not only the effective area, to calculate the reaction force aroused from the internal pressure, but also the spring rate dependent on the range of movement.<\/p>\n
Metal expansion joints are used for the extreme working conditions (temperature, pressure, chemical resistance) or extreme sizes (expansion joints of several meters of diameter for process technology \u2013 e.g. chemical reactors).<\/p>\n
Typical ranges:<\/p>\n
\n- DN from 15 \u2013 5000 mm,<\/li>\n
- PN from vacuum through pressure classes 1, 6, 10, 25, 40 up to 63 bar,<\/li>\n
- temperatures: -30\u00b0C up to 1200\u00b0C (standard material 1.4541 up to +550\u00b0C),<\/li>\n
- materials: bellows – usually 1.4541 (AISI 321) Other options see: Bellow Materials,<\/li>\n
- life cycles (designed life cycles): basic – 1.000 cycles \u2013 other \u2013 upon demand,<\/li>\n
- media examples: air, exhaust, water, steam, mineral oils and fuels, liquid gases etc.<\/li>\n<\/ul>\n
Metal expansion joints are mostly designed according to the standards defined by E.J.M.A (Expansion Joint Manufacturers Association, Inc.), which specifies the methods to calculate the strength of bellows for number of different load types. Actually valid is 9-th edition of this standard \u2013 EJMA 9. Metal expansion joints are also specified by European Norm EN 14917.<\/p>\n<\/div>\n
\nMetal expansion joints types<\/h4>\n<\/a><\/div>\n<\/a><\/div>\nSingle bellow (axial)<\/strong>
\nCapable to absorb axial movements, small lateral and angular, vibration and combined movements in a single plane.
\nEconomic, but with limited pressure capabilities, require proper anchoring and guiding.<\/div>\n<\/a><\/div>\n<\/a><\/div>\nUniversal (lateral)<\/strong>
\nAllow lateral movements in any direction. Consist of two bellows connected with the tube.
\nUsually equipped with tie rods to control the pressure thrust, so there is no need for anchor.<\/div>\n<\/a><\/div>\n<\/a><\/div>\nUniversal swing<\/strong>
\nCan absorb large lateral and angular movements in one plane due to swing bars with pins near ends of the unit.<\/div>\n<\/a><\/div>\n<\/a><\/div>\nHinged (angular)<\/strong>
\nAllows only angular movements in one plane.
\nAs the bars are permanently fixed on both ends, the pressure thrust form the bellow is not transmitted to the pipeline. Usually used in pairs on more pieces.<\/div>\n<\/a><\/div>\n<\/a><\/div>\nGimbal<\/strong>
\nAllow to angle in any plane thanks to the pair of two hinges fixed to the common floating ring located centrally.
\nPressure thrust from the bellow is not transmitted to the pipeline as the swing bars are permanently fixed at both ends.<\/div>\n\nApart from the above listed standard configurations, there are many solutions of expansion joints designed as the integral units, e.g. with the internal compensation of the pressure thrust, that eliminates need for anchoring or externally pressurized bellows designed to eliminate squirm problem at high pressures.<\/p>\n
Usually, there are very specific and different solutions designed to solve the specific application problems. Do not hesitate contacting our sale team for special items.<\/p>\n<\/div>\n
\nOptions<\/h4>\n<\/a><\/div>\n<\/a><\/div>\nTie rods<\/strong>
\nUsed to secure the expansion joint against over extension and\/or over compression. In the normal working conditions they have no influence on working expansion joint.<\/div>\n<\/a><\/div>\n<\/a><\/div>\nInner sleeves<\/strong>
\nUsed to minimize turbulences of the fluid passing through and reduce the creation of vibrations, to secure metal bellow form erosion when the fluid contains solid particles or reduce direct influence of the high temperature. During installation, the flow direction should be observed.<\/div>\n<\/a><\/div>\n
<\/div>\n\nFor some applications that requires an extra durability, longer lifetime and the flame resistance, the synthetic cord is replaced with the steel wire reinforcement.<\/div>\n
Options<\/h4>\n<\/div>\n<\/div>\nTie rods<\/strong>
\nUsed to secure the expansion joint against movement over allowed limit. There are tie rods with outer limitation, outer- and inner limitation and swivels for angular limitation.
\nZS<\/strong> – outer limiter<\/a>
\nZSS<\/strong> – inner and outer limiter<\/a>
\nRG<\/strong> – angular swivel<\/a><\/div>\n<\/div>\n<\/div>\nVacuum support<\/strong>
\nSpirals or rings protecting the bellow against collapsing in case of vacuum.
\nVSD<\/strong> – spiral<\/a>
\nVSR<\/strong> – ring<\/a>
\nVSRV<\/strong> – segmented ring<\/a>
\nTAS<\/strong> – PTFE ring<\/a><\/div>\n<\/div>\n<\/div>\nLinings and sleeves<\/strong>
\nPTFE lining is protecting the internal surface of the bellow against chemically aggressive medium. For the fluids containing abrasive particles – the metal sleeves are used.
\nSR<\/strong> – sleeve<\/a>
\nTA<\/strong> – lining<\/a><\/div>\n<\/div>\n<\/div>\nProtection covers<\/strong>
\nUsed to shield the expansion joint against high temperatur\u0119, flame, weather conditions and the sun.
\nFSH<\/strong> – Flame protection cover<\/a><\/div>\n<\/div>\n\nTECHNICAL INFORMATIONS<\/em><\/strong><\/h4>\n\n<\/div>\n\n- Check list – how to select the expansion joint?<\/a><\/li>\n
- Hints for pipework designers<\/a><\/li>\n
- Temperature influence on pressure and movement<\/a><\/li>\n
- Pressure Equipment Directive 97\/23\/EC<\/a><\/li>\n
- Overview of Certificates<\/a><\/li>\n<\/ul>\n<\/div>\n\n
<\/p>\n
\n- Assembling instructions<\/a><\/li>\n
- Flanges – types and dimensions<\/a><\/li>\n<\/ul>\n<\/div>\n<\/div>\n\n
Rubber expansion joints types<\/h4>\nERV PRODUCT RANGE<\/h4>\n
ERV high quality expansion joints DN 25 -1000 by Elaflex\/ContiTech. With swiveling flanges ( various types and materials ). For detail information see Elaflex catalogue.
\n<\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV-R<\/h4>\n
RED BAND expansion joint for water, drinking water, waste water, seawater, cooling water, chemical waste water (without oil), chemicals, acids and alkalis, salt solutions, alcohols.
\nTemperature range
\n-40\u00b0 C up to 100\u00b0 C,
\ntemporarily up to 120\u00b0 C.
\nLining Butyl \/ EPDM.<\/p>\n<\/div>\n
<\/a><\/a><\/a><\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nROTEX<\/h4>\n
ROTEX expansion joint for permanent service with heating water, cooling water and hot air (without oil). W.P. 10 bar up to 100\u00b0 C, 6 bar up to 110\u00b0 C. Temperature range -40\u00b0 up to 130\u00b0 C, temporarily up to 150\u00b0 C.
\nT\u00dcV approved for heating
\ninstallations.
\nLining EPDM.<\/p>\n<\/div>\n
<\/a><\/a><\/a><\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV – CR<\/h4>\n
CR expansion joint for cold and warm water, seawater (also oil containing), various waste water, lube oils and greases, air, compressed air. Temperature range -25 \u00b0 C up to 90\u00b0 C, temporarily up to 100\u00b0 C.
\nLining Chloroprene.<\/p>\n<\/div>\n
<\/a><\/a><\/a><\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV – BR<\/h4>\n
BR expansion joint for abrasive media such as sludges, solid\/liquid mixtures, dustlike and pow- dery products. Temperature range -50\u00b0 C up to 70\u00b0 C, temporarily up to 90\u00b0 C.
\nLining BR\/NR.<\/p>\n<\/div>\n
<\/a><\/a><\/a><\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERP<\/h4>\n
RED SPOT expansion joint for sanitary facilities, cold \/ warm water, swimming pool water, sea- water, drinking water. Highly flexible + low own resistance. W.P. max. 10 bar. Temperature range -40\u00b0 C up to 90\u00b0 C,
\ntemporarily up to 120\u00b0 C.
\nLining Butyl \/ EPDM.<\/p>\n<\/div>\n
<\/a><\/a><\/a>
\n<\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV – G<\/h4>\n
YELLOW BAND expansion joint for petroleum based products up to 50 % aromatics, also town gas and natural gas, cooling water emul- sions with corrosion preventing oil. Temperature range -20\u00b0 C up to 90\u00b0 C,
\ntemporarily up to 100\u00b0 C.
\nLining NBR.<\/p>\n<\/div>\n
<\/a><\/a><\/a>
\n<\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV – GS<\/h4>\n
YELLOW STEEL expansion joint. Similar to type ERV-G, but fire resistant to ISO 15540 (type approved). Temperature range -20\u00b0 C up to 90\u00b0 C, temporarily up to 100\u00b0 C. Lining NBR.<\/p>\n<\/div>\n
<\/a><\/a><\/a>
\n<\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV – GS HNBR<\/h4>\n
YELLOW STEEL HBNR expansion joint for pe- troleum based products up to 50 % aromatics and hydraulic oil. Very good ageing, weathering and ozone resistance. Temperature range
\n-35 \u00b0 C up to 100\u00b0 C,
\ntemporarily up to 120\u00b0 C.
\nLining HNBR.<\/p>\n<\/div>\n
<\/a><\/a><\/a>
\n<\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV – G LT<\/h4>\n
YELLOW BAND LT expansion joint designed for low temperature applications for petroleum based products. Temperature range -40\u00b0 C up to 90\u00b0 C, temporarily up to 100\u00b0 C.
\nLining NBR.<\/p>\n<\/div>\n
<\/a><\/a><\/a>
\n<\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV – OR<\/h4>\n
ORANGE BAND expansion joint for Liquid Petroleum Gas (LPG) according to EN 589. temperature range -20\u00b0 C up to 90\u00b0 C. Working pressure 25 bar, burst pressure > 100 bar<\/p>\n<\/div>\n
<\/a><\/a><\/a>
\n<\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV – GR<\/h4>\n
GREEN BAND expansion joint for acids, alkalis, chemicals and aggressive chemical waste water. Temperature range -20\u00b0 C up to 100\u00b0 C, temporarily up to 110\u00b0 C. For oil contaminated compressor air
\nup to 90\u00b0 C. Lining CSM.<\/p>\n<\/div>\n
<\/a><\/a><\/a><\/p>\n<\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV – W<\/h4>\n
WHITE BAND expansion joint for foodstuffs, also oils and fat containing food. Liner conforms to German foodstuff regulations. Temperature range -20\u00b0 C up to 90\u00b0 C, temporarily up to
\n100\u00b0 C.
\nLining NBR, light grey.<\/p>\n<\/div>\n
<\/a><\/a><\/a><\/p>\n\nAccessories<\/h4>\n\n\n- Tie rods with outer limitation (… ZS),<\/li>\n
- Tie rods with inner and outer limitation (… ZSS),<\/li>\n
- Angular limiter ( … RG ),<\/li>\n
- Inner protection sleeve stainless steel (… SR),<\/li>\n
- PTFE liner ( … TA ),<\/li>\n
- PTFE liner and vacuum support ring (… TAS),<\/li>\n
- Vacuum support spiral stainless steel (… VSD),<\/li>\n<\/ul>\n<\/div>\n\n
\n- Vacuum support ring stainless steel (… VSR),<\/li>\n
- Bolted vacuum support ring stainless (… VSRV),<\/li>\n
- Flame protection cover ( … FSH ),<\/li>\n
- Flame protection cover Naval Standard (… FSH-M),<\/li>\n
- Earth Cover (… EAH).<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n
<\/div>
<\/div><\/p>\n<\/p>\nMetal expansion joints<\/strong><\/h2>\n\nThe metal expansion joints made from the corrugated metal sheet are traditional, and usually indispensable parts, of the pipeline. To reach the expected pressure resistance and retain the required elasticity they are usually made of multiple layers. The tubes made from a thin metal sheet are shaped with mechanical and hydraulic methods. The waves may have different profiles \u2013 suited to the needs. Multilayer construction enable the use of different materials, e.g. for inner and outer layer to achieve higher corrosion resistance the special alloys can be used. Additionally, such construction is more flexible than a single thicker metal sheet. Metal expansion joints are manufactured in the extremely wide range of diameters \u2013 from teens of millimeters up to several meters.<\/p>\n
<\/p>\n
Differently than rubber expansion joints, which are always a separate part that could be disassembled, the metal ones are usually permanently welded to the pipeline or manufactured as multi-bellow sets, consisting of two or more bellows and additional parts provided to limit the movement to the defined planes and ranges, or more sophisticated designs that can compensate the reaction force arising from the internal pressure. Over time there have been developed many complete solutions using a waved metal bellows.<\/p>\n
The characteristic feature of the metal expansion joints is relatively high spring rate, so high, that it have to be considered in pipeline calculations. For that reason the manufacturers of the metal expansion joints specifies for their products not only the effective area, to calculate the reaction force aroused from the internal pressure, but also the spring rate dependent on the range of movement.<\/p>\n
Metal expansion joints are used for the extreme working conditions (temperature, pressure, chemical resistance) or extreme sizes (expansion joints of several meters of diameter for process technology \u2013 e.g. chemical reactors).<\/p>\n
Typical ranges:<\/p>\n
\n- DN from 15 \u2013 5000 mm,<\/li>\n
- PN from vacuum through pressure classes 1, 6, 10, 25, 40 up to 63 bar,<\/li>\n
- temperatures: -30\u00b0C up to 1200\u00b0C (standard material 1.4541 up to +550\u00b0C),<\/li>\n
- materials: bellows – usually 1.4541 (AISI 321) Other options see: Bellow Materials,<\/li>\n
- life cycles (designed life cycles): basic – 1.000 cycles \u2013 other \u2013 upon demand,<\/li>\n
- media examples: air, exhaust, water, steam, mineral oils and fuels, liquid gases etc.<\/li>\n<\/ul>\n
Metal expansion joints are mostly designed according to the standards defined by E.J.M.A (Expansion Joint Manufacturers Association, Inc.), which specifies the methods to calculate the strength of bellows for number of different load types. Actually valid is 9-th edition of this standard \u2013 EJMA 9. Metal expansion joints are also specified by European Norm EN 14917.<\/p>\n<\/div>\n
\nMetal expansion joints types<\/h4>\n<\/a><\/div>\n<\/a><\/div>\nSingle bellow (axial)<\/strong>
\nCapable to absorb axial movements, small lateral and angular, vibration and combined movements in a single plane.
\nEconomic, but with limited pressure capabilities, require proper anchoring and guiding.<\/div>\n<\/a><\/div>\n<\/a><\/div>\nUniversal (lateral)<\/strong>
\nAllow lateral movements in any direction. Consist of two bellows connected with the tube.
\nUsually equipped with tie rods to control the pressure thrust, so there is no need for anchor.<\/div>\n<\/a><\/div>\n<\/a><\/div>\nUniversal swing<\/strong>
\nCan absorb large lateral and angular movements in one plane due to swing bars with pins near ends of the unit.<\/div>\n<\/a><\/div>\n<\/a><\/div>\nHinged (angular)<\/strong>
\nAllows only angular movements in one plane.
\nAs the bars are permanently fixed on both ends, the pressure thrust form the bellow is not transmitted to the pipeline. Usually used in pairs on more pieces.<\/div>\n<\/a><\/div>\n<\/a><\/div>\nGimbal<\/strong>
\nAllow to angle in any plane thanks to the pair of two hinges fixed to the common floating ring located centrally.
\nPressure thrust from the bellow is not transmitted to the pipeline as the swing bars are permanently fixed at both ends.<\/div>\n\nApart from the above listed standard configurations, there are many solutions of expansion joints designed as the integral units, e.g. with the internal compensation of the pressure thrust, that eliminates need for anchoring or externally pressurized bellows designed to eliminate squirm problem at high pressures.<\/p>\n
Usually, there are very specific and different solutions designed to solve the specific application problems. Do not hesitate contacting our sale team for special items.<\/p>\n<\/div>\n
\nOptions<\/h4>\n<\/a><\/div>\n<\/a><\/div>\nTie rods<\/strong>
\nUsed to secure the expansion joint against over extension and\/or over compression. In the normal working conditions they have no influence on working expansion joint.<\/div>\n<\/a><\/div>\n<\/a><\/div>\nInner sleeves<\/strong>
\nUsed to minimize turbulences of the fluid passing through and reduce the creation of vibrations, to secure metal bellow form erosion when the fluid contains solid particles or reduce direct influence of the high temperature. During installation, the flow direction should be observed.<\/div>\n<\/a><\/div>\n
<\/div>\n<\/div>\n\nUsed to secure the expansion joint against movement over allowed limit. There are tie rods with outer limitation, outer- and inner limitation and swivels for angular limitation.
\nZS<\/strong> – outer limiter<\/a>
\nZSS<\/strong> – inner and outer limiter<\/a>
\nRG<\/strong> – angular swivel<\/a><\/div>\n
<\/div>\n<\/div>\n\nSpirals or rings protecting the bellow against collapsing in case of vacuum.
\nVSD<\/strong> – spiral<\/a>
\nVSR<\/strong> – ring<\/a>
\nVSRV<\/strong> – segmented ring<\/a>
\nTAS<\/strong> – PTFE ring<\/a><\/div>\n
<\/div>\n<\/div>\n\nPTFE lining is protecting the internal surface of the bellow against chemically aggressive medium. For the fluids containing abrasive particles – the metal sleeves are used.
\nSR<\/strong> – sleeve<\/a>
\nTA<\/strong> – lining<\/a><\/div>\n
<\/div>\n<\/div>\n\nUsed to shield the expansion joint against high temperatur\u0119, flame, weather conditions and the sun.
\nFSH<\/strong> – Flame protection cover<\/a><\/div>\n<\/div>\n
TECHNICAL INFORMATIONS<\/em><\/strong><\/h4>\n\n<\/div>\n\n- Check list – how to select the expansion joint?<\/a><\/li>\n
- Hints for pipework designers<\/a><\/li>\n
- Temperature influence on pressure and movement<\/a><\/li>\n
- Pressure Equipment Directive 97\/23\/EC<\/a><\/li>\n
- Overview of Certificates<\/a><\/li>\n<\/ul>\n<\/div>\n\n
<\/p>\n
\n- Assembling instructions<\/a><\/li>\n
- Flanges – types and dimensions<\/a><\/li>\n<\/ul>\n<\/div>\n<\/div>\n\n
Rubber expansion joints types<\/h4>\nERV PRODUCT RANGE<\/h4>\n
ERV high quality expansion joints DN 25 -1000 by Elaflex\/ContiTech. With swiveling flanges ( various types and materials ). For detail information see Elaflex catalogue.
\n<\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV-R<\/h4>\n
RED BAND expansion joint for water, drinking water, waste water, seawater, cooling water, chemical waste water (without oil), chemicals, acids and alkalis, salt solutions, alcohols.
\nTemperature range
\n-40\u00b0 C up to 100\u00b0 C,
\ntemporarily up to 120\u00b0 C.
\nLining Butyl \/ EPDM.<\/p>\n<\/div>\n
<\/a><\/a><\/a><\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nROTEX<\/h4>\n
ROTEX expansion joint for permanent service with heating water, cooling water and hot air (without oil). W.P. 10 bar up to 100\u00b0 C, 6 bar up to 110\u00b0 C. Temperature range -40\u00b0 up to 130\u00b0 C, temporarily up to 150\u00b0 C.
\nT\u00dcV approved for heating
\ninstallations.
\nLining EPDM.<\/p>\n<\/div>\n
<\/a><\/a><\/a><\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV – CR<\/h4>\n
CR expansion joint for cold and warm water, seawater (also oil containing), various waste water, lube oils and greases, air, compressed air. Temperature range -25 \u00b0 C up to 90\u00b0 C, temporarily up to 100\u00b0 C.
\nLining Chloroprene.<\/p>\n<\/div>\n
<\/a><\/a><\/a><\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV – BR<\/h4>\n
BR expansion joint for abrasive media such as sludges, solid\/liquid mixtures, dustlike and pow- dery products. Temperature range -50\u00b0 C up to 70\u00b0 C, temporarily up to 90\u00b0 C.
\nLining BR\/NR.<\/p>\n<\/div>\n
<\/a><\/a><\/a><\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERP<\/h4>\n
RED SPOT expansion joint for sanitary facilities, cold \/ warm water, swimming pool water, sea- water, drinking water. Highly flexible + low own resistance. W.P. max. 10 bar. Temperature range -40\u00b0 C up to 90\u00b0 C,
\ntemporarily up to 120\u00b0 C.
\nLining Butyl \/ EPDM.<\/p>\n<\/div>\n
<\/a><\/a><\/a>
\n<\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV – G<\/h4>\n
YELLOW BAND expansion joint for petroleum based products up to 50 % aromatics, also town gas and natural gas, cooling water emul- sions with corrosion preventing oil. Temperature range -20\u00b0 C up to 90\u00b0 C,
\ntemporarily up to 100\u00b0 C.
\nLining NBR.<\/p>\n<\/div>\n
<\/a><\/a><\/a>
\n<\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV – GS<\/h4>\n
YELLOW STEEL expansion joint. Similar to type ERV-G, but fire resistant to ISO 15540 (type approved). Temperature range -20\u00b0 C up to 90\u00b0 C, temporarily up to 100\u00b0 C. Lining NBR.<\/p>\n<\/div>\n
<\/a><\/a><\/a>
\n<\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV – GS HNBR<\/h4>\n
YELLOW STEEL HBNR expansion joint for pe- troleum based products up to 50 % aromatics and hydraulic oil. Very good ageing, weathering and ozone resistance. Temperature range
\n-35 \u00b0 C up to 100\u00b0 C,
\ntemporarily up to 120\u00b0 C.
\nLining HNBR.<\/p>\n<\/div>\n
<\/a><\/a><\/a>
\n<\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV – G LT<\/h4>\n
YELLOW BAND LT expansion joint designed for low temperature applications for petroleum based products. Temperature range -40\u00b0 C up to 90\u00b0 C, temporarily up to 100\u00b0 C.
\nLining NBR.<\/p>\n<\/div>\n
<\/a><\/a><\/a>
\n<\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV – OR<\/h4>\n
ORANGE BAND expansion joint for Liquid Petroleum Gas (LPG) according to EN 589. temperature range -20\u00b0 C up to 90\u00b0 C. Working pressure 25 bar, burst pressure > 100 bar<\/p>\n<\/div>\n
<\/a><\/a><\/a>
\n<\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV – GR<\/h4>\n
GREEN BAND expansion joint for acids, alkalis, chemicals and aggressive chemical waste water. Temperature range -20\u00b0 C up to 100\u00b0 C, temporarily up to 110\u00b0 C. For oil contaminated compressor air
\nup to 90\u00b0 C. Lining CSM.<\/p>\n<\/div>\n
<\/a><\/a><\/a><\/p>\n<\/a><\/p>\n<\/a><\/p>\n<\/p>\n\nERV – W<\/h4>\n
WHITE BAND expansion joint for foodstuffs, also oils and fat containing food. Liner conforms to German foodstuff regulations. Temperature range -20\u00b0 C up to 90\u00b0 C, temporarily up to
\n100\u00b0 C.
\nLining NBR, light grey.<\/p>\n<\/div>\n
<\/a><\/a><\/a><\/p>\n\nAccessories<\/h4>\n\n\n- Tie rods with outer limitation (… ZS),<\/li>\n
- Tie rods with inner and outer limitation (… ZSS),<\/li>\n
- Angular limiter ( … RG ),<\/li>\n
- Inner protection sleeve stainless steel (… SR),<\/li>\n
- PTFE liner ( … TA ),<\/li>\n
- PTFE liner and vacuum support ring (… TAS),<\/li>\n
- Vacuum support spiral stainless steel (… VSD),<\/li>\n<\/ul>\n<\/div>\n\n
\n- Vacuum support ring stainless steel (… VSR),<\/li>\n
- Bolted vacuum support ring stainless (… VSRV),<\/li>\n
- Flame protection cover ( … FSH ),<\/li>\n
- Flame protection cover Naval Standard (… FSH-M),<\/li>\n
- Earth Cover (… EAH).<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n
<\/div>
<\/div><\/p>\n<\/p>\nMetal expansion joints<\/strong><\/h2>\n\nThe metal expansion joints made from the corrugated metal sheet are traditional, and usually indispensable parts, of the pipeline. To reach the expected pressure resistance and retain the required elasticity they are usually made of multiple layers. The tubes made from a thin metal sheet are shaped with mechanical and hydraulic methods. The waves may have different profiles \u2013 suited to the needs. Multilayer construction enable the use of different materials, e.g. for inner and outer layer to achieve higher corrosion resistance the special alloys can be used. Additionally, such construction is more flexible than a single thicker metal sheet. Metal expansion joints are manufactured in the extremely wide range of diameters \u2013 from teens of millimeters up to several meters.<\/p>\n
<\/p>\n
Differently than rubber expansion joints, which are always a separate part that could be disassembled, the metal ones are usually permanently welded to the pipeline or manufactured as multi-bellow sets, consisting of two or more bellows and additional parts provided to limit the movement to the defined planes and ranges, or more sophisticated designs that can compensate the reaction force arising from the internal pressure. Over time there have been developed many complete solutions using a waved metal bellows.<\/p>\n
The characteristic feature of the metal expansion joints is relatively high spring rate, so high, that it have to be considered in pipeline calculations. For that reason the manufacturers of the metal expansion joints specifies for their products not only the effective area, to calculate the reaction force aroused from the internal pressure, but also the spring rate dependent on the range of movement.<\/p>\n
Metal expansion joints are used for the extreme working conditions (temperature, pressure, chemical resistance) or extreme sizes (expansion joints of several meters of diameter for process technology \u2013 e.g. chemical reactors).<\/p>\n
Typical ranges:<\/p>\n
\n- DN from 15 \u2013 5000 mm,<\/li>\n
- PN from vacuum through pressure classes 1, 6, 10, 25, 40 up to 63 bar,<\/li>\n
- temperatures: -30\u00b0C up to 1200\u00b0C (standard material 1.4541 up to +550\u00b0C),<\/li>\n
- materials: bellows – usually 1.4541 (AISI 321) Other options see: Bellow Materials,<\/li>\n
- life cycles (designed life cycles): basic – 1.000 cycles \u2013 other \u2013 upon demand,<\/li>\n
- media examples: air, exhaust, water, steam, mineral oils and fuels, liquid gases etc.<\/li>\n<\/ul>\n
Metal expansion joints are mostly designed according to the standards defined by E.J.M.A (Expansion Joint Manufacturers Association, Inc.), which specifies the methods to calculate the strength of bellows for number of different load types. Actually valid is 9-th edition of this standard \u2013 EJMA 9. Metal expansion joints are also specified by European Norm EN 14917.<\/p>\n<\/div>\n
\nMetal expansion joints types<\/h4>\n<\/a><\/div>\n<\/a><\/div>\nSingle bellow (axial)<\/strong>
\nCapable to absorb axial movements, small lateral and angular, vibration and combined movements in a single plane.
\nEconomic, but with limited pressure capabilities, require proper anchoring and guiding.<\/div>\n<\/a><\/div>\n<\/a><\/div>\nUniversal (lateral)<\/strong>
\nAllow lateral movements in any direction. Consist of two bellows connected with the tube.
\nUsually equipped with tie rods to control the pressure thrust, so there is no need for anchor.<\/div>\n<\/a><\/div>\n<\/a><\/div>\nUniversal swing<\/strong>
\nCan absorb large lateral and angular movements in one plane due to swing bars with pins near ends of the unit.<\/div>\n<\/a><\/div>\n<\/a><\/div>\nHinged (angular)<\/strong>
\nAllows only angular movements in one plane.
\nAs the bars are permanently fixed on both ends, the pressure thrust form the bellow is not transmitted to the pipeline. Usually used in pairs on more pieces.<\/div>\n<\/a><\/div>\n<\/a><\/div>\nGimbal<\/strong>
\nAllow to angle in any plane thanks to the pair of two hinges fixed to the common floating ring located centrally.
\nPressure thrust from the bellow is not transmitted to the pipeline as the swing bars are permanently fixed at both ends.<\/div>\n\nApart from the above listed standard configurations, there are many solutions of expansion joints designed as the integral units, e.g. with the internal compensation of the pressure thrust, that eliminates need for anchoring or externally pressurized bellows designed to eliminate squirm problem at high pressures.<\/p>\n
Usually, there are very specific and different solutions designed to solve the specific application problems. Do not hesitate contacting our sale team for special items.<\/p>\n<\/div>\n
\nOptions<\/h4>\n<\/a><\/div>\n<\/a><\/div>\nTie rods<\/strong>
\nUsed to secure the expansion joint against over extension and\/or over compression. In the normal working conditions they have no influence on working expansion joint.<\/div>\n<\/a><\/div>\n<\/a><\/div>\nInner sleeves<\/strong>
\nUsed to minimize turbulences of the fluid passing through and reduce the creation of vibrations, to secure metal bellow form erosion when the fluid contains solid particles or reduce direct influence of the high temperature. During installation, the flow direction should be observed.<\/div>\n<\/a><\/div>\n
<\/div>\n- \n
- Check list – how to select the expansion joint?<\/a><\/li>\n
- Hints for pipework designers<\/a><\/li>\n
- Temperature influence on pressure and movement<\/a><\/li>\n
- Pressure Equipment Directive 97\/23\/EC<\/a><\/li>\n
- Overview of Certificates<\/a><\/li>\n<\/ul>\n<\/div>\n
\n<\/p>\n- \n
- Assembling instructions<\/a><\/li>\n
- Flanges – types and dimensions<\/a><\/li>\n<\/ul>\n<\/div>\n<\/div>\n
\nRubber expansion joints types<\/h4>\n
ERV PRODUCT RANGE<\/h4>\n
ERV high quality expansion joints DN 25 -1000 by Elaflex\/ContiTech. With swiveling flanges ( various types and materials ). For detail information see Elaflex catalogue.
\n<\/a><\/p>\n<\/a><\/p>\n
<\/p>\n
\nERV-R<\/h4>\n
RED BAND expansion joint for water, drinking water, waste water, seawater, cooling water, chemical waste water (without oil), chemicals, acids and alkalis, salt solutions, alcohols.
\nTemperature range
\n-40\u00b0 C up to 100\u00b0 C,
\ntemporarily up to 120\u00b0 C.
\nLining Butyl \/ EPDM.<\/p>\n<\/div>\n<\/a><\/a><\/a><\/a><\/p>\n
<\/a><\/p>\n
<\/p>\n
\nROTEX<\/h4>\n
ROTEX expansion joint for permanent service with heating water, cooling water and hot air (without oil). W.P. 10 bar up to 100\u00b0 C, 6 bar up to 110\u00b0 C. Temperature range -40\u00b0 up to 130\u00b0 C, temporarily up to 150\u00b0 C.
\nT\u00dcV approved for heating
\ninstallations.
\nLining EPDM.<\/p>\n<\/div>\n<\/a><\/a><\/a><\/a><\/p>\n
<\/a><\/p>\n
<\/p>\n
\nERV – CR<\/h4>\n
CR expansion joint for cold and warm water, seawater (also oil containing), various waste water, lube oils and greases, air, compressed air. Temperature range -25 \u00b0 C up to 90\u00b0 C, temporarily up to 100\u00b0 C.
\nLining Chloroprene.<\/p>\n<\/div>\n<\/a><\/a><\/a><\/a><\/p>\n
<\/a><\/p>\n
<\/p>\n
\nERV – BR<\/h4>\n
BR expansion joint for abrasive media such as sludges, solid\/liquid mixtures, dustlike and pow- dery products. Temperature range -50\u00b0 C up to 70\u00b0 C, temporarily up to 90\u00b0 C.
\nLining BR\/NR.<\/p>\n<\/div>\n<\/a><\/a><\/a><\/a><\/p>\n
<\/a><\/p>\n
<\/p>\n
\nERP<\/h4>\n
RED SPOT expansion joint for sanitary facilities, cold \/ warm water, swimming pool water, sea- water, drinking water. Highly flexible + low own resistance. W.P. max. 10 bar. Temperature range -40\u00b0 C up to 90\u00b0 C,
\ntemporarily up to 120\u00b0 C.
\nLining Butyl \/ EPDM.<\/p>\n<\/div>\n<\/a><\/a><\/a>
\n<\/a><\/p>\n<\/a><\/p>\n
<\/p>\n
\nERV – G<\/h4>\n
YELLOW BAND expansion joint for petroleum based products up to 50 % aromatics, also town gas and natural gas, cooling water emul- sions with corrosion preventing oil. Temperature range -20\u00b0 C up to 90\u00b0 C,
\ntemporarily up to 100\u00b0 C.
\nLining NBR.<\/p>\n<\/div>\n<\/a><\/a><\/a>
\n<\/a><\/p>\n<\/a><\/p>\n
<\/p>\n
\nERV – GS<\/h4>\n
YELLOW STEEL expansion joint. Similar to type ERV-G, but fire resistant to ISO 15540 (type approved). Temperature range -20\u00b0 C up to 90\u00b0 C, temporarily up to 100\u00b0 C. Lining NBR.<\/p>\n<\/div>\n
<\/a><\/a><\/a>
\n<\/a><\/p>\n<\/a><\/p>\n
<\/p>\n
\nERV – GS HNBR<\/h4>\n
YELLOW STEEL HBNR expansion joint for pe- troleum based products up to 50 % aromatics and hydraulic oil. Very good ageing, weathering and ozone resistance. Temperature range
\n-35 \u00b0 C up to 100\u00b0 C,
\ntemporarily up to 120\u00b0 C.
\nLining HNBR.<\/p>\n<\/div>\n<\/a><\/a><\/a>
\n<\/a><\/p>\n<\/a><\/p>\n
<\/p>\n
\nERV – G LT<\/h4>\n
YELLOW BAND LT expansion joint designed for low temperature applications for petroleum based products. Temperature range -40\u00b0 C up to 90\u00b0 C, temporarily up to 100\u00b0 C.
\nLining NBR.<\/p>\n<\/div>\n<\/a><\/a><\/a>
\n<\/a><\/p>\n<\/a><\/p>\n
<\/p>\n
\nERV – OR<\/h4>\n
ORANGE BAND expansion joint for Liquid Petroleum Gas (LPG) according to EN 589. temperature range -20\u00b0 C up to 90\u00b0 C. Working pressure 25 bar, burst pressure > 100 bar<\/p>\n<\/div>\n
<\/a><\/a><\/a>
\n<\/a><\/p>\n<\/a><\/p>\n
<\/p>\n
\nERV – GR<\/h4>\n
GREEN BAND expansion joint for acids, alkalis, chemicals and aggressive chemical waste water. Temperature range -20\u00b0 C up to 100\u00b0 C, temporarily up to 110\u00b0 C. For oil contaminated compressor air
\nup to 90\u00b0 C. Lining CSM.<\/p>\n<\/div>\n<\/a><\/a><\/a><\/p>\n
<\/a><\/p>\n
<\/a><\/p>\n
<\/p>\n
\nERV – W<\/h4>\n
WHITE BAND expansion joint for foodstuffs, also oils and fat containing food. Liner conforms to German foodstuff regulations. Temperature range -20\u00b0 C up to 90\u00b0 C, temporarily up to
\n100\u00b0 C.
\nLining NBR, light grey.<\/p>\n<\/div>\n<\/a><\/a><\/a><\/p>\n
\nAccessories<\/h4>\n
\n- \n
- Tie rods with outer limitation (… ZS),<\/li>\n
- Tie rods with inner and outer limitation (… ZSS),<\/li>\n
- Angular limiter ( … RG ),<\/li>\n
- Inner protection sleeve stainless steel (… SR),<\/li>\n
- PTFE liner ( … TA ),<\/li>\n
- PTFE liner and vacuum support ring (… TAS),<\/li>\n
- Vacuum support spiral stainless steel (… VSD),<\/li>\n<\/ul>\n<\/div>\n\n
- \n
- Vacuum support ring stainless steel (… VSR),<\/li>\n
- Bolted vacuum support ring stainless (… VSRV),<\/li>\n
- Flame protection cover ( … FSH ),<\/li>\n
- Flame protection cover Naval Standard (… FSH-M),<\/li>\n
- Earth Cover (… EAH).<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n
<\/div>
<\/div><\/p>\n<\/p>\nMetal expansion joints<\/strong><\/h2>\n
\nThe metal expansion joints made from the corrugated metal sheet are traditional, and usually indispensable parts, of the pipeline. To reach the expected pressure resistance and retain the required elasticity they are usually made of multiple layers. The tubes made from a thin metal sheet are shaped with mechanical and hydraulic methods. The waves may have different profiles \u2013 suited to the needs. Multilayer construction enable the use of different materials, e.g. for inner and outer layer to achieve higher corrosion resistance the special alloys can be used. Additionally, such construction is more flexible than a single thicker metal sheet. Metal expansion joints are manufactured in the extremely wide range of diameters \u2013 from teens of millimeters up to several meters.<\/p>\n
<\/p>\nDifferently than rubber expansion joints, which are always a separate part that could be disassembled, the metal ones are usually permanently welded to the pipeline or manufactured as multi-bellow sets, consisting of two or more bellows and additional parts provided to limit the movement to the defined planes and ranges, or more sophisticated designs that can compensate the reaction force arising from the internal pressure. Over time there have been developed many complete solutions using a waved metal bellows.<\/p>\n
The characteristic feature of the metal expansion joints is relatively high spring rate, so high, that it have to be considered in pipeline calculations. For that reason the manufacturers of the metal expansion joints specifies for their products not only the effective area, to calculate the reaction force aroused from the internal pressure, but also the spring rate dependent on the range of movement.<\/p>\n
Metal expansion joints are used for the extreme working conditions (temperature, pressure, chemical resistance) or extreme sizes (expansion joints of several meters of diameter for process technology \u2013 e.g. chemical reactors).<\/p>\n
Typical ranges:<\/p>\n
- \n
- DN from 15 \u2013 5000 mm,<\/li>\n
- PN from vacuum through pressure classes 1, 6, 10, 25, 40 up to 63 bar,<\/li>\n
- temperatures: -30\u00b0C up to 1200\u00b0C (standard material 1.4541 up to +550\u00b0C),<\/li>\n
- materials: bellows – usually 1.4541 (AISI 321) Other options see: Bellow Materials,<\/li>\n
- life cycles (designed life cycles): basic – 1.000 cycles \u2013 other \u2013 upon demand,<\/li>\n
- media examples: air, exhaust, water, steam, mineral oils and fuels, liquid gases etc.<\/li>\n<\/ul>\n
Metal expansion joints are mostly designed according to the standards defined by E.J.M.A (Expansion Joint Manufacturers Association, Inc.), which specifies the methods to calculate the strength of bellows for number of different load types. Actually valid is 9-th edition of this standard \u2013 EJMA 9. Metal expansion joints are also specified by European Norm EN 14917.<\/p>\n<\/div>\n
\nMetal expansion joints types<\/h4>\n
<\/a><\/div>\n<\/a><\/div>\nSingle bellow (axial)<\/strong>
\nCapable to absorb axial movements, small lateral and angular, vibration and combined movements in a single plane.
\nEconomic, but with limited pressure capabilities, require proper anchoring and guiding.<\/div>\n<\/a><\/div>\n<\/a><\/div>\nUniversal (lateral)<\/strong>
\nAllow lateral movements in any direction. Consist of two bellows connected with the tube.
\nUsually equipped with tie rods to control the pressure thrust, so there is no need for anchor.<\/div>\n<\/a><\/div>\n<\/a><\/div>\nUniversal swing<\/strong>
\nCan absorb large lateral and angular movements in one plane due to swing bars with pins near ends of the unit.<\/div>\n<\/a><\/div>\n<\/a><\/div>\nHinged (angular)<\/strong>
\nAllows only angular movements in one plane.
\nAs the bars are permanently fixed on both ends, the pressure thrust form the bellow is not transmitted to the pipeline. Usually used in pairs on more pieces.<\/div>\n<\/a><\/div>\n<\/a><\/div>\nGimbal<\/strong>
\nAllow to angle in any plane thanks to the pair of two hinges fixed to the common floating ring located centrally.
\nPressure thrust from the bellow is not transmitted to the pipeline as the swing bars are permanently fixed at both ends.<\/div>\n\nApart from the above listed standard configurations, there are many solutions of expansion joints designed as the integral units, e.g. with the internal compensation of the pressure thrust, that eliminates need for anchoring or externally pressurized bellows designed to eliminate squirm problem at high pressures.<\/p>\n
Usually, there are very specific and different solutions designed to solve the specific application problems. Do not hesitate contacting our sale team for special items.<\/p>\n<\/div>\n
\nOptions<\/h4>\n
<\/a><\/div>\n<\/a><\/div>\nTie rods<\/strong>
\nUsed to secure the expansion joint against over extension and\/or over compression. In the normal working conditions they have no influence on working expansion joint.<\/div>\n<\/a><\/div>\n<\/a><\/div>\nInner sleeves<\/strong>
\nUsed to minimize turbulences of the fluid passing through and reduce the creation of vibrations, to secure metal bellow form erosion when the fluid contains solid particles or reduce direct influence of the high temperature. During installation, the flow direction should be observed.<\/div>\n<\/a><\/div>\n
- Flanges – types and dimensions<\/a><\/li>\n<\/ul>\n<\/div>\n<\/div>\n
- Hints for pipework designers<\/a><\/li>\n
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