WOG or CWP Valve for Steam
WOG or CWP Valve for Steam
(OP)
I have an existing system that needs evaluation for compliance to B31.3 (as referenced by our local boiler code). The system is a deaerator for boiler feed water. One thing I have noted is that all of the ball valves on the unit do not have WSP ratings. Four have a CWP rating (1500 psi) and the other a WOG rating (2000 psi).
The deaerator has twin 25 psi relief valves and contains water and steam used for spray type deaeration.
The spec sheets on the valves list a max operating temp of 450F and 380F.
Are these adequate for the service?
The deaerator has twin 25 psi relief valves and contains water and steam used for spray type deaeration.
The spec sheets on the valves list a max operating temp of 450F and 380F.
Are these adequate for the service?





RE: WOG or CWP Valve for Steam
For the WOG rated valve, you would need to determine what standard it was made to (likely an MSS standard, perhaps SP-108) and see if that standard could provide you working pressure ratings at elevated temperatures.
Unfortunately, knowing the cold working pressure rating and the max temp doesn't actually tell us anything about pressure ratings that may apply between ambient and the max rated temperature.
RE: WOG or CWP Valve for Steam
I missed adding in my original post that those temps are at 25psi. The valve spec has a temp vs pressure graph.
RE: WOG or CWP Valve for Steam
Am I missing something ?
Or is the question that you want to validate the temp vs. pressure charts you have ?
RE: WOG or CWP Valve for Steam
RE: WOG or CWP Valve for Steam