Air and Gas Calculations
Note 1: This chapter has unit system consistent equations, not field equations. The equations may be worked using either the USCS or SI. If USCS is used, pressure is (lb/ft2 abs), specific weight (lb/ft3) or specific gravity, temperature (°Rankin), and depth (ft). If SI is used, pressure is (N/m2 abs), specific weight (N/m3) or specific gravity, temperature (Kelvin), and depth (m). API Standard Conditions are 14.696 psia (~ 14.7 psia), 59 °F, and 0% humidity.
Note 2: Flow problems with gas require that the calculations be carried out from a flow state that is known (usually at the exit). This requires that the calculations proceed from that known position in the flow to subsequent upstream positions until ...
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