faq Archives

How much expansion can a flanged and fluid expansion joint accommodate?

August 2, 1990

Flanged and flued expansion joints can take minimal amounts of axial motion due to the thickness of the flanged and flued heads.

72" Double Gimbal and Single Hinged Flanged and Flued Head Expansion Joints — 72″ Double Gimbal and Single Hinged Flanged and Flued Head Expansion Joints

What is a flange on an expansion joint?

The flange on an expansion joint can be one of the end connections to allow for connection to the pipe in the piping system.

Number79 — Flange Indicated on a Neoprene Expansion Joint

What is expansion joint ply?

Ply refers to the number of sheet metal thicknesses used in the forming of the bellows. Therefore, a 2-ply bellows would be composed of two sheets of metal.

101519a2 — 48″ Tied Universal Expansion Joint with Two-ply Bellows

What is a heat exchanger bellows?

Heat exchanger shell bellows are used on fixed tube sheet heat exchangers. Bellows deflection is only axial and can be either extension or compression depending on the differential expansion of shell and tubes. In most cases the tubes are hotter than the shell, moreover tube material is sometimes high alloy, i.e. Stainless steel or nickel alloy, which expands about 50% more than carbon steel.

Dye penetrant testing clamshell — Heat Exchanger Clam Shell Bellows

What are FLEXXCEL Flouroplastic materials composed of?

August 1, 1990

The expansion joint fabric is composed of two components: PTFE resins and fiberglass cloth.

Does the style400B turbulent air expansion joint application require a belt attachment?

Yes, it does. This model requires belt attachment nuts to be tack welded.

Where can I store a fabric expansion joint?

Expansion Joints should be stored in a clean and dry environment. However, as a minimum, expansion joints must be stored so that water does not penetrate any closed container.

Do the turbulent flue gas and wet gas expansion joint applications have potential for wet conditions?

Yes they do have potential for wet conditions.

212 — Turbulent Flue Gas/Wet Gas Expansion Joint

What are styles of dirty flue gas expansion joint applications?

Styles Include: Style 200W, Style 100W, Style 300W, Style 600W, and Style 700W

What is a drawback of FLEXXCEL elastomeric belt materials?

The biggest limitation is the relatively low-temperature capability.

Elastomeric Fabric Belt Single Ply Reinforcement — 1/8″ Thick Elastomeric Fabric Belt With Single Ply Reinforcement

For fabric expansion joints what type of rotation is the twisting of one side of the duct about the longitudinal axis?

That is called torsional rotation.

Fabric Expansion Joint Torsional Rotation — Torsional Rotation

On a fabric expansion joint where is the radius corner located?

The belt radius is located at the corner of rectangular expansion joints. The radius corner helps prevent sharp creases that may shorten belt life.

205 — Rectangular Fabric Expansion Joint

How is the Flexxcell FF1 manufactured?

Flexxcell FF1 is manufactured to a high weight without sacrificing the critical flexing properties required for a fabric expansion joint.

For fabric expansion joints can the fabric belt withstand thermal, pressure and chemical conditions?

Yes, it can. The fabric belt must be able to withstand the thermal, pressure and chemical conditions. Modern fabrics accomplish this with a chemically inert barrier bonded to high strength substrate. For high-temperature applications, a layer of insulation is incorporated into the belt.

What is the function of the particulate deflector on a fabric expansion joint?

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.