3 The maximum total pipe length 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 is avoided. The maximum air velocity through
the grids is 5 m/s (16.5 ft/s).
The maximum allowable pressure drop over the cooling air ducts depends on the ambient
temperature, consult your supplier.
The maximum air temperature at the compressor intake is 40 ˚C (104 ˚F) (minimum 0 ˚C /
32 ˚F).
The ventilation capacity required to limit the compressor room temperature can be
calculated as follows:
•
Qv = 0.92 N/dT
Qv = Required ventilation capacity in m
3
/s
N = Shaft input of compressor in kW
dT = Temperature increase in compressor room
5 Pressure switch
6 Main cable entry
7 The drain pipes to the drain collector must not dip into the water.
Instruction book
20 2920 7002 03
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