(1) Minimum free area to be reserved for the compressor installation
(2) Ventilation proposals (on air-cooled compressors)
(3) Cooling systems (on water-cooled compressors)
Description
1 Install the compressor unit on a solid, level floor suitable for taking the weight.
2 Position of the compressed air outlet valve.
3 The pressure drop over the air delivery pipe can be calculated as follows:
Δp = (L x 450 x Q
c
1.85
) / (d
5
x P), with
d = Inner diameter of the pipe in mm
Δp = Pressure drop (recommended maximum: 0.1 bar (1.5 psi)
L = Length of the pipe in m
P = Absolute pressure at the compressor outlet in bar(a)
Q
c
= 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 minimise carry-over of possible condensate residue.
4 Ventilation: the inlet grids and ventilation fan should be installed in such a way that any
recirculation of cooling air to the compressor or dryer is avoided. The maximum air velocity
through the grids is 5 m/s (16.5 ft/s).
The maximum air temperature at the compressor intake is 46 ˚C (115 ˚F) (minimum 0 ˚C / 32 ˚F).
For air-cooled compressors ventilation alternatives 1 and 3, the ventilation capacity
required to limit the compressor room temperature can be calculated as follows:
• Q
v
= (1.06 N + 8)/ΔT for GA Workplace Full-Feature compressors
The cooling air of the dryer can be ducted outside
Q
v
= Required ventilation capacity in m
3
/s
N = Shaft input of compressor in kW
ΔT = Temperature increase in compressor room in °C
For ventilation alternatives 2 and 4: the fan capacity should match the compressor fan capacity
at a pressure head equal to the pressure drop over the air ducts.
The maximum allowed pressure drop in ducting before or after the compressor is 30 Pa
5 The drain pipes to the drain collector must not dip into the water of the drain collector. Atlas
Copco has oil/water separators (type OSD or OSCi) to separate the major part of the oil from the
condensate to ensure that the condensate meets the requirements of the environmental codes.
6 Control module with monitoring panel.
7 Power supply cable to be sized and installed by a qualified electrician.
To preserve the protection degree of the electric cubicle and to protect its components from dust
from the environment, it is mandatory to use a proper cable gland when connecting the supply
cable to the compressor.
8 Provision for energy recovery system.
9 Filter, type DD for general purposes. The filter traps solid particles down to 1 micron with a max.
oil carry-over of 0.5 mg/m
3
. A high-efficiency filter, type PD, may be installed downstream of a DD
filter. This filter traps solid particles down to 0.01 micron with a max. oil carry-over of 0.01 mg/m
3
.
If oil vapours and odours are undesirable, a QD type filter should be installed downstream of the
PD filter.
It is recommended to install by-pass pipes over each filter together with ball valves, in order to
isolate the filters during service operations without disturbing the compressed air delivery.
10 Safety valve
11 By-pass system to by-pass the dryer during service operations (available as an option, consult
Atlas Copco).
Instruction book
56 API603130
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