Page 148 - Air and Gas Drilling Manual

4-34 Air and Gas Drilling Manual
.5 lb/hr
. ) =1
113
˙ w = 0
.540
(210
f
The specific gravity of diesel fuel is 0.8156, thus, the total volume (in United States
gallons) of diesel fuel consumption per hour is
q f = 113 5 . = 16 7 . gal/hr
.
(0 8156 )(8 33 )
.

Figure 4-18: Fuel consumption for natural gas [3, 12].
b) Surface location at 6,000 ft above sea level.
The prime mover has a derated maximum 234 horsepower available at 1,000
rpm at 6,000 ft elevation. The actual shaft power needed by the three-stage rotary
compressor to produce the 240 psig maximum pressure output is 168.7 horsepower.
Thus, the percent load on the prime mover, or power ratio is

.
PR = 168 7 (100 ) = 72 1.
234
Entering the abscissa of Figure 4-17 with the power ratio percent, the approximate
fuel consumption rate can be read on the ordinate using the diesel fuel curve. The