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Multi-Layer Metallic Bellows

Metal expansion joints are indispensable elements for pipeline technology. They are used to compensate for changes in length which arise in pipelines from temperature differences. In addition, they are able to absorb vibrations arising from pumps, motors, compressors or turbines. Axial, lateral or angular movements can be compensated depending on the specific situation, and we are happy to advise you on the best type of bellows.

DEKOMTE stainless steel expansion joints are manufactured as single-walled or multi-walled bellows. The standard designs listed in the following tables provide an overview of our range and can aid you in your design considerations. However we would recommend that you provide us with detailed information on each individual use as we can then technically optimise the possible expansion joints taking account of movements, pressure, temperature etc. which usually leads to lower costs as well.

Nominal diameters of metal expansion joints

DN 15 to DN 6000. From DN 250 intermediate sizes can be manufactured without considerable additional costs. Rectangular expansion joints with rounded corners in any size are manufactured.

Pressure range of metal expansion joints

The standard expansion joints can be supplied for pressures up to PN 40 depending on nominal diameter, bellows construction and type of construction. Please request a quote for higher pressures.

Materials for metal expansion joints

For temperatures up to 600ºC, the standard material for bellows and conduits is V2A or V4A (material 1.4541 (321), 1.4301 (304), 1.4571 (316Ti), 1.4435, for higher temperatures it is material 1.4828 (308) or 1.4878). Special materials such as Hastelloy, Incoloy or Inconel can also be supplied. For multi-walled bellows it is possible, if required, to select a higher quality material for the internal and external layer than for the intermediate layers which are usually made of material 1.4301 (304). Connectors and anchorings are made of unalloyed steel, rust-proof or acid-proof stainless steel or high-temperature steel, depending on requirements.

Connections to metal expansion joints

Welding flanges, loose and integral flanges, threaded joints, in accordance with German and international standards. Special connections in accordance with customer drawings are also possible.

Connectors and anchorings are made of unalloyed steel, rust-proof or acid-proof stainless steel or high-temperature steel, depending on requirements.

Metallic bellows can compensatre axial, lateral or angular movements

DEKOMTE gives support in selecting the best type of expansion joint.

DEKOMTE metallic bellows are delivered with welding flanges, loose and integral flanges or threaded joints