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    aiene's Avatar
    aiene Posts: 3, Reputation: 1
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    #1

    Jan 21, 2011, 06:39 PM
    Working pressure of a boiler is 470 psig.the safety valve lifts 570 psig and blows do
    Working pressure of a boiler is 470 psig.the safety valve lifts 570 psig and blows down to 480 psig.the blowdown is what percentage og the working pressure?
    jcaron2's Avatar
    jcaron2 Posts: 986, Reputation: 204
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    #2

    Jan 21, 2011, 11:11 PM
    The way I read your question, it sounds like the blowdown pressure is 90 psig (570 psig - 480 psig). So that's 90/470 = 19.15%.

    Am I missing something? It didn't say anything about absolute pressure versus gauge pressure, so it seems to really be that simple.
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