(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 maximum total pipe length (including interconnecting piping between compressor and
receiver) can be calculated as follows:
dp = (L x 450 x Qc
1.85
) / (d
5
x p)
d = Inner diameter of the outlet pipe in mm
dp = Pressure drop (recommended maximum = 0.1 bar/1.5 psi)
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
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 GA 37 VSD up to GA 90 VSD air-cooled compressors alternatives 1 and 3, the
ventilation capacity required to limit the compressor room temperature can be
calculated as follows:
•
Qv = 1.06 N/dT for GA VSD Workplace compressors
•
Qv = (1.06 N + 8)/dT for GA VSD Workplace Full-Feature compressors
The cooling air of the dryer can be ducted outside
Qv = Required ventilation capacity in m
3
/s
N = Shaft input of compressor in kW
dT = Temperature increase in compressor room
For 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.
For GA 37 VSD up to GA 90 VSD water-cooled compressors, the ventilation capacity
required to limit the compressor room temperature can be calculated as follows:
•
Qv = 0.13 N/dT for GA VSD Workplace compressors
•
Qv = (0.13 N + 8)/dT for GA VSD Workplace Full-Feature compressors
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) 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 an electrician.
In case of an IT network consult Atlas Copco.
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.
Instruction book
2920 1634 04 73
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