Page 41 - Handbook of Natural Gas Transmission and Processing Principles and Practices

o
o
when P is 1 atm (14.6959 psia or 101.325 kPa) and T is 60°F (519.67 R or 288.71 K) this
s
s
equation can be written in three well known standard forms:

(1.12)

3
where B is in ft /SCF, P is in psia, and T is in °R. Alternately,
g

(1.13)

3
3
where B is in m /Sm , P is in KPa, and T is in °K.
g
In some cases, it is more convenient to define the value of B in bbl/SCF. The equation can be
g
written as:

(1.14)

where T is in °R and P is in psia.

1.6.1.4. Gas Density
The gas density is defined as mass per unit volume and so can also be derived and calculated from
the real gas law:

(1.15)

Knowing that molecular weight of gas is the product of specific gravity and molecular weight of
air, and the value of R is 10.73 in field units [8.314 in SI units], we can write the equation for density
as:

(1.16)

3
where is in lbm/ft , P is in psia, and T is in °R. Alternately,

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