Section VIII UG-136(a)(3) states “Each pressure relief valve on air, water over 140o F (60o C), or steam service shall have a substantial lifting device which when activated will release the seating force on the disk when the pressure relief valve is subjected to a pressure of at least 75% of the set pressure of the valve.”
Code Case 2203 states the lifting device may be omitted provided:
- The user has a documented procedure and an associated implementation program for the periodic removal of the pressure relief valves for inspection and testing, and repair as necessary.
- The omission is specified by the user.
- The user shall obtain permission to omit the lifting device from the authority having jurisdiction over the installation of pressure vessels.