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How do you connect duct pipe with expansion joints?

Connecting duct pipe with expansion joints can be accomplished by using angle iron flanges, weld bands or butt welding.

How do you attach a copper tube with a bellows?

A copper tube can be attached by brazing or soldering the tube to the bellows.

How do you anchor and guide an expansion joint on elevated pipe?

The anchoring and guiding of any expansion joint system would be per EJMA standards. Elevated piping systems will usually use some type ...Continue Reading

How do you adjust pipe expansion joint tie rods?

Tie rods on expansion joints are factory set in the manufacture process and should not be adjusted in the field.

How do the bellows flex when you have a solid rod connecting each end together?

The flow end bellows will compress and the balancing bellows will extend because they are connected by the rods.

How do I insulate large piping expansion joints?

An external cover can be provided as an accessory to expansion joints so that insulation can then be placed over the expansion ...Continue Reading

How do I change a steam expansion joint?

The expansion joint can be replaced by an expansion joint of a similar design in the cold condition (when the plant is ...Continue Reading

How does one determine the design life of a particular bellow as opposed to cycle life?

Design life is fatigue life which is also the cycle life. They are all the same thing.

How does an expansion joint operate in a furnace?

Expansion joints are not installed inside furnaces due to the extremely high temperatures of the environment and the piping system. Expansion ...Continue Reading

How does an expansion bellows function?

A bellows functions by compressing or extending according to the axial motion that is required in the piping system. Please see video ...Continue Reading

How close should the expansion joint be set to the anchor?

The expansion joint should be located as close as possible to the main anchor. The first guide should be 4 pipe ...Continue Reading

How are the telescoping liner and liner seal installed?

They are installed before the fabric belt installation. Telescoping liners are welded on each side of the expansion joint, either ...Continue Reading

How are the seals retained?

Seals are retained with clips and welded to the inside diameter of the liner.

For field installation work do you have tools to punch holes in the expansion joint? Is it a mechanical or hydraulic punch?

For a fabric expansion joint, what does the joint frame take the place of?

Do you provide lifting lugs and/or lift points to be used during field installation?

Yes we do provide lifting lugs. Whether or not we provide them depends upon the size and weight of the unit.

Do you normally recommend tie-rods for a single expansion joint?

Not normally, it all depends on the service condition or application of the expansion joint.

Do you include or recommend adding construction tolerances to the calculated thermal movements the expansion joints are supposed to accommodate?

No, expansion joints are good for thermal or operating movements only. They should not be used for any misalignments or ...Continue Reading

Do intermediate anchors have to be a full anchors on an expansion joint?

No, intermediate anchors are typically used to divide the pipeline into sections and therefore multiple expansion joints can be used to divide ...Continue Reading

Does US Bellows, Inc. have any unique design for pressure thrust balancing an in-line slip joint for long stretch of large-bore pipes?

Slip joints transfer pressure thrust & spring forces into system unlike pressure balanced units.