Compressors / compressed air - Aircraft

Compressed air line systems - Ø 15-28 mm
Determining the diameter of compressed air piping
Compressed air distribution with closed circular pipeline
For the dimensioning of the closed circular pipeline half the nominal
length of the total closed circular pipeline and the total compressed air
requirement is to be deducted.
Example:
Compressed air requirement 1000 l/min., working overpressure 7 bar,
total tube line length would be 300 m, to be calculated as a closed
circular pipeline of 150 m.
Delivery volume of the compressor
length m 25 50 100 150 200 250 300
l/min.
200 12 12 12 15 15 15 18
400 12 12 15 15 15 18 18
500 15 15 15 18 18 18 18
750 15 15 18 18 18 22 22
1000 15 15 18 18 22 22 22
1500 18 18 18 22 22 22 22
2000 18 18 22 22 22 28 28
3000 22 22 28 28 28 28 28
4000 28 28 28 28 28 28 28
In order to determine the required line lengths for the main, supply and
branch line, we recommend to plan the supply line since a closed circular
pipeline as then the dimensioning can be based upon total the output and
half the line length.
Determining the fluidic piping length
The values of the spare piping length need to be added to the actual pipe length, in order to get fluidic piping length L:
Spare tube line length of fittings per piece
Outside Ø 15 18 22 28
Inside Ø 12 14 18 23
Fittings comparable with 3/8” 1/2” 3/4” 1”
Ball valve 0.1 m 0.2 m 0.3 m 0.4 m
Angle 0.7 m 1 m 1.3 m 1.5 m
T-piece 0.85 m 1 m 1.5 m 2 m
Reduction piece 0.4 m 0.45 m 0.5 m 0.6 m
Arithmetic example to determine the effective piping length l:
Planned Spare tube Nominal
components line length length
2 x T-pieces Ø 18 1 m 2 m
3 x angle Ø 18 1 m 3 m
1 x ball valve Ø 18 0.2 m 0.2 m
Sum 5.2 m
Effective tube line length: planned length + total nominal length
Compressed air distribution with stub
Flow rates for plastic tubes and aluminium tubes
Tube Ø mm Plastic tube Plastic tube Aluminium tube Aluminium tube
Main line Branch line Main line Branch line
6 m/sec. at 8 bars 15 m/sec. at 8 bars 6 m/sec. at 8 bars 15 m/sec. at 8 bars
l/min. l/min. l/min. l/min.
15 365 916 430 1004
18 498 1248 650 1548
22 823 2057 1018 2442
28 1344 3367 1720 4160
To dimension the stub the whole tube line length and the overall
pressure air requirement is included in the calculation.
Example:
Compressed air requirement 750 l/min., working overpressure 7
bars, total tube line length would be 50 m
Delivery volume of the compressor
length m 25 50 100 150 200 250 300
l/min.
200 12 12 12 15 15 15 18
400 12 12 15 15 15 18 18
500 15 15 15 18 18 18 18
750 15 15 18 18 18 22 22
1000 15 15 18 18 22 22 22
1500 18 18 18 22 22 22 22
2000 18 18 22 22 22 28 28
3000 22 22 28 28 28 28 28
4000 28 28 28 28 28 28 28
Further technical details upon request. All indicated values
correspond to the theoretical calculations and are therefore
non-binding. Exactly calculate for the individual tube line
and cut them to the situation on site.
The indicated valves for
the flow in the main tube
can be changed at flow in
both directions.
Other values for larger
tube diameters are
available upon request.
116 Built according to CE directives