Duct work assemblies can include fabricated elbows, tees, straight sections of duct work, fabric or metallic expansion joints and can be rectangular or round.
Tag: Expansion Joint Accessories
When should you use a liner in an expansion joint?
It is recommended that all expansion joints include liners in order to protect the bellows from the internal flow environment.
What is a movement guide?
A movement guide controls the thermal motion of the piping system into the bellowsRead More
What is an expansion coupling used for?
Expansion couplings are used mainly to connect two pieces of pipe together.
How thick are internal liners for bellows?
Usually, the liner material can be the same as the system pipe material, such as carbon steel, with liner thicknesses of 1/8-inch and greater depending upon flow rate and diameter.
How do you restrain the growth of a bellows?
The growth of an expansion joint bellows is restrained with the use of limit rods.
What is an internal liner?
Internal liners are an expansion joint accessory used to protect the convolutions from direct flow impingement, which can cause erosion and flow-induced vibration. They are recommended to extend the life of metallic expansion joints.
For a simple bellow, are the tie-rods main purpose to take the pressure thrust?
How do you handle pressure thrust in a piping system?
Pressure thrust can be absorbed by placing anchors in a system or by using an expansion joint with tie rods.
What is a directional anchor on a bellows?
A directional anchor restrains the pressure thrust from the expansion joint and allows for movement in a direction perpendicular to the pressure thrust.
Why do the universal expansion joints need to be tied?
The tie rods are used to take the pressure thrust forces. Most universal expansion joints use tie rods to eliminate the requirements for main anchorsRead More
What is meant by pantographic linkage?
How many tie rods should you use for an expansion joint?
What is the purpose of the control rods in an expansion joint?
Control rods are used to control axial and lateral movements of the expansion joint.
When do you use limit rods on expansion joints?
Limit rods are used to limit axial expansion or compression to prevent the bellows from over-compression. Limit rods are designed to absorb the pressure thrust of the expansion joint in case of anchor failure.
What is the purpose of tie rods on an expansion joint?
The function of tie rods on an expansion joint is to continuously restrain the full pressure thrust during normal operation while permitting only lateral deflection. Angular rotation can be accommodated only if two tie rods are used and located 90 degrees opposed to the direction of rotation.