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    Gas Correction Factors for Variable Area Flow Meters

    To determine corrected flowrate: find the gas for which the meter is calibrated in the left column, move to the right to the gas that is being used. Multiply the flowrate indicated on the meter by the correction factor. This will equal an approximation of the flowrate of the gas being used.

    Please note: this correction factor is only accurate within ±10%. This is also inaccurate for extremely low flow, or elevated pressure; consult factory for your specific condition.

    Gas being used / S.G.

    Gas for which meter is calibrated

    H2

    Cracked
    Ammonia

    Methane

    Ammonia

    Gas

    Neon

    Acetylene

    N2 or O2

    Air

    Ethane

    O2

    Argon

    CO2 or N2O

    Propane

    Butane

    0.070

    0.294

    0.554

    0.588

    0.620

    0.700

    0.899

    0.967

    1.000

    1.038

    1.105

    1.520

    1.523

    1.523

    2.007

    Air

    3.78

    1.84

    1.34

    1.30

    1.27

    1.20

    1.05

    1.02

    1

    0.98

    0.95

    0.85

    0.81

    0.81

    0.71

    Oxygen

    3.97

    1.94

    1.41

    1.37

    1.34

    1.26

    1.11

    1.07

    1.05

    1.03

    1

    0.90

    0.85

    0.85

    0.74

     


    Calculating Conversion Factors

    Based on Specific Gravity

    Conversion Factor Calculations


    Pressure & Temperature Corrections

    Pressure Effects

    • Elevated pressures (above atmosphere)
    allow for greater capacity for a given flowmeter

    • To determine the actual flowrate (at the elevated
    pressure), the following formula is used:

    Pressure Effects Correction Calculation 

    • All pressures are in absolute, not gauge

    Temperature Effects

    • Elevated temperatures (above standard
    atmospheric temperature) decrease maximum
    flowrate for a given flow body

    • To determine the actual flowrate,
    the following formula is used:

    Temperature Effects Correction Calculation

    • All temperatures are in absolute

    Pressure Correction Example

    • Our flowmeters are calibrated at a standard
    pressure of 14.696 PSIA (which is equivalent
    to 0 PSIG)

    • If a customer is operating the meter at 20 PSIG,
    what will the effect be on the flow reading?

    – The actual flowrate will be higher than
    that indicated by the flowmeter
    – How much higher will it be?

    Pressure Correction Calculation

    Pressure Correction Example 

    Pressure Correction Actual Flow Rate

    Temperature Correction Example

    • Our flowmeters are calibrated at a standard
    temperature of 20 °C or 68 °F

    • If a customer is using the meter at 30 °C, what
    will the effect be on the flow reading?

    – The actual flowrate will be lower than
    that indicated by the flowmeter
    – How much lower will it be?

     

     Temperature Correction Calculation

    Temperature Correction Example

    Temperature Correction Actual Flow Rate

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