Measuring a gas mass fraction
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United States of America Patent
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Sep 2, 2003
Grant Date -
N/A
app pub date -
Oct 23, 2000
filing date -
Apr 23, 1998
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Abstract
A method of measuring a gas mass fraction (X) in a mass of liquid and gas flowing in direction (A) along pipeline (2) which includes a venturi formed by throat (10), convergent portion (12) and divergent portion (14). Adjacent the venturi (12, 10, 14) but upstream is a flow conditioner (28) creating a uniform mixture of gas and liquid downstream so as to reduce or avoid slip between the gas and liquid phases in the venturi. Differential pressure (DP1) is measured between a position upstream of the flow conditioner and a position intermediate the flow conditioner and venturi. Differential pressure (DP2) is measured between the throat and a position intermediate the flow conditioner and venturi. Differential pressure (DP3) is measured across the venturi. Computer (50) calculates the gas mass fraction (X) using a formula that may take the form: X=a.multidot.(DP1).sup.b.multidot.(DP2).sup.c.multidot.(DP3).sup. d.multidot.(DP2-DP3).sup.e.multidot.(DP1+DP3).sup.f, in which a, b, c, d, e and f are constants.
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