Technical data

10
Compressed Air Applications Manual | Configuration of a compressed air system
Connecting pipes (CP)
The connecting pipe runs from the dis-
tribution pipe to the machine or com-
pressed-air supply point. The way in
which the connecting pipe is joined to the
distribution pipe will depend on the actual
air quality. If the air is not dried, the con-
necting pipe should be led to the top of
the distribution line in order to keep out
condensate.
If the air is dried, the connecting pipe can
lead directly downwards.
Connecting pipes should always be fit-
ted with a shutoff valve at the end. With
an individual connecting pipe, the shutoff
valve can be integrated into the down-
stream outlet connector. In the case of
group connections via a manifold, it is
recommended to install a separate shut-
off valve at this point.
When a machine or production tool is
connected directly to the distribution
pipe, it is recommended to install an elec-
trically operated shutoff valve. This will
shut off the air supply when the machine
is switched off. In this manner, the loss of
compressed air through leaks in the ma-
chine can be avoided.
The pressure loss in the connecting
pipes (CP) should not exceed
∆p ≤ 0.04 bar.
Q
l/s, m
3
/min
DN
mm
PB
d
0.42/0.25 12 16
9.2/0.55 15 20
L = 10 m/p = 6 bar
Nominal diameter (DN) of connecting
pipes (CP) with a length of 10 m and an
operating pressure of 6 bar.
Arrangement of connecting pipe when
the air is not dried
Arrangement of CP when the air is dry
DP
CP
DP
CP
CP
Individual connecting pipe with integrated
shutoff valve
Manifold for group connection
Q
l/s, m
3
/min
DN
mm
PB
d
16.6/1 20 25
33.3/2 25 32
L = 10 m/p = 6 bar