Technical data

4
Compressed Air Applications Manual | Air quantity
The actual air quantity required will de-
pend on the points of use to be supplied.
Compressed air should flow with-
out loss from the compressor to the
point of use. This means that the
compressed air network has to be
leakproof in order to avoid waste and
unnecessary operating costs.
The loss of air – i.e., of energy – through
leaks in the distribution network or equip-
ment results in a completely unnecessary
increase in the operating costs.
The easiest measurement of leakage
loss is carried out by emptying the re-
ceiver.
Compressed air is an expensive form of
energy.
In neglected compressed air systems,
the leakage volume is attributable to
≈30 % to the distribution network and
≈70 % to hoses and tools.
Air quantity
Hole diameter Air loss
in l/s at
Power in kWh required
for air compression
Costs for 8000 Bh/a at
€ 0.10 kWh
Ø mm 6 bar 12 bar 6 bar 12 bar 6 bar 12 bar
1 1.2 1.8 0.3 1.0 245,- 818,-
3 11.1 20.8 3.1 12.7 2 536,- 10 389,-
5 30.9 58.5 8.3 33.7 6 790,- 27 569,-
10 123.8 235.2 33.0 132.0 26 996,- 113 098,-
Compressing 1 m³ of air to 6 bar requires 0.075 kWh.
t
PA
PE
VB
VL = Leakage volume
VB = Receiver volume
pA = Initial pressure
pE = Final pressure
t = Measurement
time
€/kWh
Heat Elektr. Compr.
use air 6 bar
0,15
0,10
0,05
VB x (pA - pE)
t
VL=
500 l x (9 bar - 7 bar)
3 minutes
VL= = 333 l/min