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Pressure Relief Valve sizing ?

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The Steam Whisperer
The Steam Whisperer Member Posts: 1,215
in THE MAIN WALL
I just received an inspection fail from the Illinois State Fire Marshall. The boiler is a 491,000 input, 408 lb/hr steam boiler and the inspector is requiring at minimum 800 lb/hr relief valve. Burner is a Carlin 301 with a rating from 401mbh to 1100 mbh. The inspector is requiring the relief valve capacity based on the burner input, not boiler capacity. Does this square with ASME? I'd like to see the section calling out minimum relief valve capacity.
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  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,523
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    The inspector doesn't know what he's doing. Safety valve are never sized on burner capacity.

    I don't have the ASME code but I have a book "ASME CODE Simplified" by Mr Carroll.
    Pg 139 "the valve should have sufficient capacity to discharge all the steam that the boiler MFG has rated the boiler to produce"

    How would the above inspector size a safety valve for a coal or wood boiler...ask him that.

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