(g) The words "gas" or "natural gas" as used in these rules shall, unless
otherwise specifically provided, be defined to mean dry, merchantable, natural
gas, either dry gas as produced from a dry gas well or so-called casinghead gas after
removal of gasoline vapors, or either such gas after dilution with other gas or gases,
as distinguished from so-called casinghead gas before treatment for removal of
gasoline vapors.
(h) The term "cubic foot" of gas as used in these rules shall have the following
meanings:
(i) In cases where gas is supplied and metered to the ultimate consumer at the
standard delivery pressure which may vary from 3 inches to 10 inches water
column, a cubic foot of gas shall be defined to be that volume of gas which, at the
temperature and pressure existing in the meter, occupies 1 cubic foot.
(ii) In cases where gas is supplied to purchasers through orifice or positive
meters at other than standard delivery pressure as defined above, a cubic foot of gas shall
be defined to be that volume of gas which, at 60 degrees Fahrenheit and at absolute
pressure of 14.65 pounds per square inch, occupies 1 cubic foot; except that in
cases where a different pressure base that is considered by the commission to be
fair and reasonable is provided for in gas sales contracts or in rules or practices of a
distributor such different pressure base shall be effective. (Corrections for
temperature and pressure shall be made in accordance with
Charles' law and Boyle's law respectively, except that, when the meter pressure is
125 pounds per square inch gauge or greater, correction shall be made for deviation from
such laws (supercompressibility) in accordance with American gas association gas
measurement committee report no. 3, "Orifice Metering of Natural Gas" dated April,
1955, or other procedures which may be approved by the commission.)
(iii) The cubic foot of gas for the purposes of measuring gas produced and
purchased at wells shall be defined to be that volume of gas which, at an assumed
temperature of 60 degrees Fahrenheit and an absolute pressure of 15.025 pounds per
square inch, occupies 1 cubic foot: provided, that contracting parties may agree to
any special method or procedure in measuring or determining temperatures that is
considered by the commission to be reasonable. (Corrections for temperature and
pressure shall be made in accordance with Charles' law and Boyle's law respectively,
except that, when the meter pressure is 125 pounds per square inch gauge or
greater, correction shall be made
(supercompressibility) in accordance with American
for
deviation
from
gas
such
association
laws
gas
measurement committee report no. 3, "Orifice Metering of Natural Gas" dated April,
1955, or other procedures which may be approved by the commission.)
(iv) The standard cubic foot of gas for testing the gas itself for heating value,
etc., shall be that volume of gas which, when saturated with water vapor and at a
temperature of 60 degrees Fahrenheit and under a pressure equivalent to that of 30
inches of mercury (mercury at 32 degrees Fahrenheit and under standard gravity)
occupies 1 cubic foot. (Corrections for temperature and pressure shall be made in
accordance with Charles' law and Boyle's law respectively, except that, when the meter
pressure is 125 pounds per square inch gauge or greater, correction shall be made
for deviation from such laws (supercompressibility) in accordance with American
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