Why An Expansion Joint Works Part One

Why An Expansion Joint Works Part One

How does a thin bellows hold the same pressure as that of a thicker pipe? The hoop stress pressure of a pipe is derived and then a comparison is made to how it is calculated for a metal bellows.

This is the basis for the equation found in both the ASME code and the EJMA design manual.

Metal bellows pressure increasing reinforcement options such as root rings and T-rings are reviewed.

This is a video that is of interest to design, piping, and vessel engineers.

Length: 6:28


About The Author

Greg Perkins
Greg Perkins
President & General Manager

Greg Perkins has 25 years experience in the expansion joint industry. In his previous employment with Senior Flexonics Pathway, Greg Perkins held the position of CEO and General Manager for 11 years. Prior positions include project engineer, director of engineering, and business unit manager.

In addition Greg, a degreed engineer, served on both the EJMA (expansion joint manufacturers association) technical and management committee tasked with developing/updating bellows and expansion joint performance criteria. Proficient in ASME design codes. Patents include high temperature piping restraint structures for expansion joint applications.

Got questions? Need answers? Call Greg today (830) 626-7773 or send him an email [email protected]!