Atlas Copco GA 160 VSD Instruction Book page 55

Instruction book
Phase
1
2
3
Correction factors
Air consumption divided by compressor free air delivery
0.9
0.8
0.7
0.5
0.3
0.2
0.1
APF192090
Description
Install the compressor on a level floor suitable for taking its weight. For ventilation
alternative 1 (indicated as Alt. 1), the minimum distance between the top of the bodywork
and the ceiling is 1200 mm (47.2 in).
Remove the plastic plug (if provided) from the compressor air outlet pipe and fit the air
outlet valve (to be provided by the customer) to the pipe. Close the valve and connect it
to the net.
The pressure drop over the air outlet pipe can be calculated as follows:
For SI Units:
1.85
dp = (L x 450 x Qc ) / (d
d = Inner diameter of the outlet pipe in mm
dp = Pressure drop (recommended maximum = 0.1 bar)
L = Length of outlet pipe in m
p = Absolute pressure at the compressor outlet in bar(a)
Qc = Free air delivery of the compressor in l/s
It is recommended that the connection of the compressor air outlet pipe is made on top of
the main air net pipe in order to minimize carry-over of possible condensate residue.
As a rule of thumb, the following formula can be used to calculate the recommended
volume of the air net:
V = (30 x C x p x Q) / Dp
C = Correction factor
Dp = Pressure difference between unloading and loading pressures in bar (recommended
minimum = 0.6)
p = Compressor inlet pressure in bar absolute
Q = Free air delivery of compressor in l/s
V = Recommended air net volume in l
5
x p)
Correction factor C
0.10
0.15
0.20
0.25
0.20
0.15
0.10
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