Single Boiler stop check valve required?
Single Boiler stop check valve required?
(OP)
We purchased a used boiler that came with both a stop check valve and a stop valve. We are going to install as the only boiler in the system and no other steam sources attached to the header. When reviewing ASME B31.1 - 2004 section 122.1.7 (A) specifically(A.3) it would appear that a stop check valve (non-return) is not required in this application. I would appreciate any feedback as to this interpretation. Thank you in advance.





RE: Single Boiler stop check valve required?
Yes, you are correct for a single boiler installation. ASME Boiler and Pressure vessel Code PG-58.3.1 requires only a single boiler stop valve located downstream of the superheater outlet header.
RE: Single Boiler stop check valve required?
Also, if multiple boilers are feeding a common steam header, a non return valve is no longer mandated, but 2 stop valves with a telltale bleed is required at the outlet of each boiler. A a practical matter, though, one of these 2 stop valves would be a stop-check valve.