2920 1381 02
17
Instruction book
Ref. Description/recommendation
on
Fig. 2.3
1 Install the compressor on a solid, level floor suitable
for taking the weight.
2 Position of compressed air outlet valve.
3 The maximum total pipe length (including
interconnecting piping between compressor and
receiver) can be calculated as follows:
L = (dp x d
5
x p) / (450 x Qc
1.85
)
L = pipe length in m
dp = maximum allowable pressure drop
(recommended 0.1 bar)
d = inner diameter of pipe in mm
p = compressor outlet pressure in bar absolute
Qc = free air delivery of 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 air
velocity to the grids must be limited to 5 m/s. The
maximum allowable pressure drop over the cooling air
ducts is 50 Pa.
- For alternatives 1 and 3, the required ventilation
capacity to limit the compressor room temperature
can be calculated as follows:
Qv = 1.06 N / dT for GA Pack air-cooled
compressors
Qv = (1.06 N + 6) / dT for GA Full-feature
air-cooled compressors
Qv = 0.16 N / dT for GA Pack water-cooled
compressors
Qv = (0.16 N + 6) / dT for GA Full-feature
water-cooled compressors
Qv = required ventilation capacity in m³/s
N = nominal motor power 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.
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.
Ref. Description/recommendation
on
Fig. 2.3
6 Position of control panel.
7 Position of mains cables.
8 Provision for inlet and outlet of energy recovery system
(system is optional).
9 Filter, type DD, for general purpose filtration (optional).
The filter traps solid particles down to 1 micron with
max. oil carry-over of 0.5 mg/m³. A high-efficiency
filter, type PD (optional), may be installed downstream
of a DD filter. This filter traps solid particles down to
0.01 micron with max. oil carry-over of 0.01 mg/m³. If
oil vapour and odours are undesirable, a filter of the
QD type (optional) should be installed downstream of
the PD filter.
10 The air receiver (optional) should be installed in a frost-
free room on a solid, level floor.
For normal air consumption, the volume of the air net
(receiver and piping) can be calculated as follows:
V = (0.25 x Qc x p1 x To) / f
max
x dp x T1
V = volume of air net in l
Qc = free air delivery of compressor in l/s
p1 = compressor air inlet pressure in bar absolute
f
max
= cycle frequency = 1 cycle/30 s
dp = difference between unloading and
loading pressures
T1 = compressor air inlet temperature in K
To = air receiver temperature in K
By-pass system for compressors with dryer (optional)
11 Dryer by-pass pipe.
12 Condensate trap.
14 Dryer by-pass valve (inside the bodywork).
For water-cooled compressors
13 Position of cooling water pipes.
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