Page 125 - Air and Gas Drilling Manual
P. 125
Chapter 4: Compressors 4-11
Figure 4-9: Rotary compressors operating with back-pressure at the built-in design
pressure (upper), with a back-pressure above the built-in design pressure (middle), and
with a back-pressure below the built-in design pressure (lower) [1].
The volumetric flow rate for a sliding vane compression stage, q s , is
approximately
q = 20. a l d −( m t N (4-2)
)
s 2
and
d − d
a = 2 1 (4-3)
2
where q s is volumetric flow rate (cfm),
a is the eccentricity (ft),
