Steam Relief Valve (SRV) Expansion Joints
Source: Expansion Joint Systems, Inc.
Introducing an expansion joint in any piping or ducting systems may also introduce Pressure Thrust unless the joint is a restrained or balanced type
Introducing an expansion joint in any piping or ducting systems may also introduce Pressure Thrust unless the joint is a restrained or balanced type. Most expansion joints used in Steam Relief Valve (SRV) lines are restrained type (tied universals), therefore the positioning of the joint is important. To use a tied joint, all the axial movement has to be within the tie rods, the remaining movements are taken laterally.
Piping flexibility is very important on this type of system. Before using an expansion joint, analyze the piping. It may be flexible enough not to require expansion joints.
If axial movement has to be absorbed from outside the tie rods, a balanced joint is recommended. The remaining option, which is occasionally used, is a 3-hinge system. The thermal movements seen on a SRV system are two fold:
- Normal everyday movement of the SRV itself.
- Additional thermal movement when the SRV opens due to the steam flow through the pipe.
Expansion Joint Systems, Inc., 10025 Prospect Avenue, Suite 202, Santee, CA 92071. Tel: 619-562-7458; Fax: 619-562-0636.
This website uses cookies to ensure you get the best experience on our website. Learn more