Atlas Copco GA90 User Manual

99
Instruction book
9096 3313 00
Description
(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)
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)
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 5m/s.
The maximum air temperature at the compressor intake is 46 °C (minimum 0 °C). For air-
cooled compressors ventilation 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 Workplace compressors
? Qv = (1.06 N + 8)/dT for GA 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 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.
For water-cooled compressors, the ventilation capacity required to limit the
compressor room temperature can be calculated from:
? Qv = 0.13 N/dT for GA Workplace compressors
? Qv = (0.13 N + 8)/dT for GA Workplace Full-Feature compressors
Max. allowable pressure drop in ducting before or after the compressor = 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, maybe 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

Atlas Copco GA90 Specifications

General

Brand	Atlas Copco
Model	GA90
Category	Air Compressor
Language	English