2 replies to this topic

We're having a discussion about requirements for lift levers on RVs. ASME BPVC Sec VIII Div 1 para UG-136(a)(3) states "Each pressure relief valve on air, water over 140°F (60”C), or steam service shall have a substantial lifting device . . .". We interpret the "air" fluid as being ambient air with potential high humidity, and condensate in an air receiver tank.

Our service is research air, filtered and dried to a -90F dewpoint. We have never lifted lift levers in our system; we remove RVs and bench test periodically either in-house, or at a VR shop for Code valves. Lift levers make valves expensive. I noted in an RP520 task force meeting (4/20/2005) that "Nobody in room understands the technical justification for the lifting levers. " See link

http://committees.ap...sjntmin-s05.pdf

Since we are testing valves on the unit or on the bench (per NBIC 23, RB3550), are lifting levers a requirement?

I am not an expert, but it is my understanding the history of the lifting lever goes back to the late 1800s or early 1900s when metallurgy and seat design was not as advanced as it is today. Typically they would chain the lifting lever to pulleys and a pull handle located at a safe distance. The RV would be tested daily or on a periodic basis to ensure it works by operating the lifting lever. The code has provided an exemption that you have already found that allows you to operate without the lever provided you follow the code exemption requirements.

WDB12630