Metal Expansion Joint

More Information

Keyser Metal Expansion Joints Applications For Axial Movement Material Evaluation For Hydro-Forming Process Types of Expansion Joints available Pressure Balanced Expansion Joints Dual-flex And Universal Series Model PBEU Analysis i) Universal LPG Expansion Bellow ii) Sleeve Type Expansion Joint

Keyser Metal Expansion Joints Design

In order to evaluate the loads upon piping, supports or equipment, the determination of the forces and movements required is essential in order to move an Expansion Joint. Due to this reason, the catalogs of most Expansion Joint manufacturers will contain force data to move a convolution to the rated axial movement established by the manufacturer. For convenience, it desirable to divide this force by the rated movement to obtain a bellows resistance factor or working spring rate, fw. in pounds per inch of movement per convolution. Once this factor has been determined, the movements and forces required to move an Expansion Joint may be calculated as follows: (Formulas from the EJMA Handbook Eighth Edition 2003 & Ninth Edition 2008)

The preceding relationships are applicable in all Expansion Joints. It should be noted that every equation is dependent upon data which must be supplied by the Expansion Joint manufacturer. For standard designs, all necessary data is available in the catalogs of the individual manufacturer. UNDER NO CIRCUMSTANCES SHOULD THE DATA OF ONE MANUFACTURER BE APPLIED TO THE PRODUCT OF ANOTHER DUE TO FUNDAMENTAL DESIGN DIFFERENCES.

Lateral Deflection (Universal Expansion Joint) Axial Movement (Single Expansion Joint) Angular Movement (Single Expansion Joint) Lateral Movement (Single Expansion Joint) Unreinforced Bellows Optional: Reinforced Bellows