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Posted by Bob D. on April 05, 2006 at 10:17:44:
In Reply to: steam header posted by John T on April 04, 2006 at 16:13:32:
In a high pressure system (>15 PSIG), ASME Boiler & PV Code, Section I, is usually an accepted Standard, and it requires, for any boiler having a man-hole opening, two stop valves with a free-blow drain between them (PG-58.3.2). Usually, the valve closest to the boiler drum will be a combination stop & non-return.