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Categories - Frequently Asked Questions (FAQ)

Category Articles
What is the purpose of tie rods on an expansion joint?
Added on Tue, Feb 8, 2011
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... Read More
When do you use limit rods on expansion joints?
Added on Tue, Feb 8, 2011
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. Limit Rods Read More
What is the purpose of the control rods in an expansion joint?
Added on Sat, Apr 16, 2011
Control rods are used to control axial and lateral movements of the expansion joint. Single Hinged Expansion Joint with Control Rods Read More
Why do the universal expansion joints need to be tied?
Added on Thu, Nov 3, 2011
The tie rods are used to take the pressure thrust forces. Most universal expansion joints use tie rods to eliminate the requirements for main anchors. Universal Expansion Joint Read More
How many tie rods should you use for an expansion joint?
Added on Wed, Jul 6, 2011
The number of tie-rods used is determined by the design pressure of the expansion joint. It can range from two to eight tie rods in extremely high pressure conditions. Universal Expansion Joint with Tie Rods Read More
What is a directional anchor on a bellows?
Added on Wed, Jun 29, 2011
A directional anchor restrains the pressure thrust from the expansion joint and allows for movement in a direction perpendicular to the pressure thrust. Single Expansion Joints Read More
What is meant by pantographic linkage?
Added on Sat, Apr 16, 2011
Pantographic linkage is an accessory that is used to distribute axial movement between two bellows, allow lateral motion and support the weight of the center pipe section between the bellows. Expansion Joint with Pantographic Linkage Read More
How do you handle pressure thrust in a piping system?
Added on Sat, Apr 16, 2011
Pressure thrust can be absorbed by placing anchors in a system or by using an expansion joint with tie rods. Inline Pressure Balance Read More
For a simple bellow, are the tie-rods main purpose to take the pressure thrust?
Added on Thu, Nov 3, 2011
Yes for a simple bellow, the tie-rods main purpose is to hold the pressure thrust. 12" Single Expansion Joints With Tie Rods Read More
What is an internal liner?
Added on Tue, Feb 8, 2011
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. Internal... Read More
How do you restrain the growth of a bellows?
Added on Sat, Apr 16, 2011
The growth of an expansion joint bellows is restrained with the use of limit rods. Limit Rods Shown on a Universal Expansion Joint Read More
How thick are internal liners for bellows?
Added on Tue, Feb 8, 2011
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. 50 Universal Expansion Joints with Liners Read More
What is an expansion coupling used for?
Added on Wed, Jun 29, 2011
Expansion couplings are used mainly to connect two pieces of pipe together. Read More
What is a movement guide?
Added on Wed, Jun 29, 2011
A movement guide controls the thermal motion of the piping system into the bellows. Read More
When should you use a liner in an expansion joint?
Added on Wed, Jul 6, 2011
It is recommended that all expansion joints include liners in order to protect the bellows from the internal flow environment. Universal Expansion Joint with Stainless Steel Liner Read More
Can duct work include expansion joints?
Added on Tue, Aug 13, 2013
Duct work assemblies can include fabricated elbows, tees, straight sections of duct work, fabric or metallic expansion joints and can be rectangular or round. Duct work and expansion joint assembly. Read More
 
 
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