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    BTU and Orifice Size Guide

    BTU Input

    Natural Gas Pressure
    Inches W.C.

    L/P Gas Pressure
    Inches W.C

    3.0" 3.5" 4.0" 4.5" 7.0" 11"
    10,000 51 52 1/16 53 54 62
    12,000 50 50 51 51 53 59
    14,000 48 49 50 50 52 57
    16,000 46 5/64 48 49 51 56
    18,000 45 46 47 48 50 55
    20,000 44 44 45 46 49 54
    25,000 3\32 42 43 44 46 53
    30,000 38 40 41 42 44 52
    35,000 35 36 38 39 42 50
    40,000 31 33 35 36 41 48
    Drill Sizes
    K Factor .82 Calculation Based on:
    Natural-1050 BTU Gas -0.65 Spec. Gr.
    L/P-2500 BTU Gas - 1.55 Spec Gr.
    Approximate sizes based on average data for all orifice types.

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