Page 704 - Air and Gas Drilling Manual

Appendix
D

Average Annual Atmospheric Conditions

This appendix gives the graphic representation of the average atmospheric
conditions for mid-latitudes (30˚ N to 60˚ N) of the North American continent.
Figure D-1 gives the average annual atmospheric pressure of air for mid-latitudes
of the North American continent as a function of surface elevation location above
mean sea level. These average annual atmospheric pressures are of critical
importance in predicting the actual weight rate of flow of air (or other gases) at an
actual drilling location (see Chapters 5, 8, 9 and 10).
Figure D-2 gives the average annual atmospheric temperature of air for mid-
latitudes of the North American continent as a function of surface elevation location
above mean sea level. These average annual atmospheric temperatures are of critical
importance in predicting the approximate geothermal temperature at an actual drilling
location (see Chapters 5, 8, 9 and 10).
Figure D-3 gives the specific weight of atmospheric air for the average annual
atmospheric pressures and temperatures given in Figures D-1 and D-2 as a function
of surface elevation location above mean sea level.
Figure D-4 gives the specific weight of air at the average annual atmospheric
pressures given in Figure D-1 for various actual atmospheric temperatures (i.e., 20˚
F, 40˚F, 60˚F, 80˚F) as a function of surface elevation location above mean sea
level. These values are very useful for determining the adjusted minimum
volumetric flowrate for air (or other gases) for surface elevations above mean sea
level (see Chapters 4, 5, 8, 9 and 10).

D-1
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