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Single Boiler stop check valve required?

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?

bh1;
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?

Correct, and if the boiler is installed feeding a single steam turbine , then the steam turbine inlet stop valve may serve as the required stop valve, if it is suitable for hydrotest purposes.

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.

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