Propane Vapour Pressure - Ametek 241CE II Operator's Manual

Propane Vapour Pressure

1,2,3
Vapour pressure data for propane from three sources are tabulated in
Figures 5-1 and 5-2. The data in these figures are illustrated for compari-
son with the vapour pressures calculated from the equations listed under
References 2 and 3 (in Figures 5-1 and 5-2). At a given temperature, the
average of the results obtained from the two equations is taken as the
vapour pressure for propane. For completeness, the two equations are
reproduced here.
From Reference 2, the Pv is the vapour pressure of propane (mm Hg) and
t is the temperature (°C).
813.2
log = 6.82973 –
P
10 v
248 + t
From Reference 3,
1737.2
log = 36.007 – – 11.666 log T + 0.0085187T
P
10 v 10
T
where Pv is the vapour pressure propane (mm Hg) and T is the absolute
temperature (K). Equation 2 was based upon 105 data points in the range
-128.9 to 96.8 °C and fitted the data with an average deviation of 0.46 per-
cent.
5-4 | Model 241CE II Hydrocarbon Dewpoint Analyzer