Tag: faq

Yes, we would recommend that the expansion joint is filled with Kao, but it would require a special design or over-sized bellows.

We obtain the MTR’s and additionally we perform positive material identification tests in house and if a customer requires additional the additional chemical and physical properties, we can obtain that as well.

A double offset expansion joint can be used to absorb large amounts of lateral motion with a minimum amount of deflection forces

Bellows have corrugations (convolutions) in order to be able to absorb the thermal movement of the piping.

We punch form our bellows. This is an industry accepted forming method.

There are a variety of places for the insulation pillow to be placed within the expansion joint. It can be inside the unit or we can fabricate the expansion joint over sized and we can fill the extra space with the insulation pillow for example to reduce the skin temperature of the fabric.

The location of expansion joints in a piping system depends on the design conditions and the piping system configuration. All cases must be evaluated individually.

Use a center spool support to support the weight of the spool between the bellows and to stabilize the center spool during operation.

Kaowool is used. It is a ceramic thermal blanket.

Pressure balance type. The major advantage of a pressure balanced joint is its ability to absorb axial movement without imposing additional pressure thrust into the piping system.

Fatigue life of any unit has to be calculated. The number of cycles varies according to the design conditions of the expansion joints.

If you use a two-ply bellows, each ply can be designed for the full temperature and pressure conditions so that if the inside ply were to fail, you would still have the outside ply to carry the design pressure and temperatures.

This expansion joint is also known as an Omega bellows pipe expansion joint for it resembles the Greek letter Omega.

Design condition of bellow prescribes physical dimension and shape of convolution. It also depends on a combination of size, temperature and pressure. The image of the rounded corner below is an example of an U-shaped design.

1″ nom diameter.

There is not a particular time period of service life, but it depends on the environmental condition of the expansion joints. Maintenance is not required on expansion joints.

Hinged expansion joints are used in conjunction with piping loops in order to absorb large amounts of thermal expansion.

There is not an acceptance criterion for bolt to fabric connection.

In certain conditions, a particulate deflector can be specified to reduce air born particulate from falling down into the expansion joint cavity. This is most common on vertical ducting with the flow directions up and an upstream liner overlapping the downstream duct. The deflector presents an angled surface to the flow and eliminates a ledge for build-up.