Technical data

28
Compressed Air Applications Manual | Dimensioning
Compressed air demand
The compressed air demand is deter-
mined on the basis of the specifications
for the machine or device connected to
the compressed air network. However,
in order to ensure that the pipe network
is not overdimensioned, it is important to
determine the degree of utilization η
and take this into account.
For calculating the necessary com-
pressed air demand it is recommend-
ed to include an extra allowance and
adequate spare capacity.
Allowances for:
• Leaks at the points od use 10%
• Estimation errors 10%
• Spare capacity 20%
Examples of the determination of the
compressed air demand:
Machine No. 1 2
Compr. air demand
V = l/min
300 500
Number of ma-
chines
n
2 1
Degree of utilization
η = %
50 25
Compr. air demand
V = l/min
300 125
Total compr. air
demand
425 l/min
V = V x n x η
Compressed air demand incl. allowances
V = 600 l/min