Posted by Tarzan on June 06, 2001 at 04:09:34:
In Reply to: pressure test posted by DFer on June 05, 2001 at 17:34:15:
If you mean a hydrostatic test, you want to do it IAW the NBIC (National Board Inspection Code). Basicly, ensure the boiler is completely full of water and make certain not to exceed the MAWP of the boiler by more than X 1.5.... Use water that is as close to 70F as possible. Vent all air from the boiler, valve it off and press it up to any pressure at or below MAWP x 1.5....MAWP is stamped somewhere on the boiler. When at the desired pressure, stop the hydro pump and observe the pressure to gage the rate of drop. If any pressure drop is noted, find the leak. Never leave the boiler isolated and under pressure as it could over pressurize from an increase in ambient temp.
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