Tag: faq

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

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

The anchoring and guiding of any expansion joint system would be per EJMA standards. Elevated piping systems will usually use some type of tied expansion joint to eliminate main anchors.

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

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

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

The expansion joint can be replaced by an expansion joint of a similar design in the cold condition (when the plant is shut down). Shipping brackets should be placed on the expansion joint before un-flanging or cutting the expansion joint from the system.

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

Expansion joints are not installed inside furnaces due to the extremely high temperatures of the environment and the piping system. Expansion joints will typically be found in the piping coming in and out of the furnace.

A bellows functions by compressing or extending according to the axial motion that is required in the piping system.

The expansion joint should be located as close as possible to the main anchor. The first guide should be 4 pipe diameters from the expansion joint. The second guide should be 14 pipe diameters from the first guide.

They are installed before the fabric belt installation. Telescoping liners are welded on each side of the expansion joint, either on inner diameter base of flange or inner diameter of pipe. Liner seal is held by clips that are also welded on the inner diameter of the liners.

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

Holes should never be punch on or in expansion joints.

The joint frame takes the place of the stiffener flange.

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

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

No, expansion joints are good for thermal or operating movements only. They should not be used for any misalignments or to close any gap while installing.

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

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