1.3 Piping
Pipe sizes for air mains or lines: “Table 1”
Air mains and lines must be of adequate size and strength for
the systems requirements. See table 1 for recommended
sizes.
Slope all air lines toward compressor receiver tanks. This will
help prevent moisture in branch lines See drawing C.
Valves should be provided in various branches and loops of air
systems to allow separation from main system in event of
failure or reason for shut-down. These valves should normally
be open.
Branch lines to various air tools, and appliances should be
brought off top or side of mains to prevent entry of moisture as
it condenses in mains. Never connect a branch line at bottom
of mains See drawing D.
1.3.1 Piping diagram
Table 1: Pipe sizes for compressed air lines:
Air
Length of pipe lines in feet
c.f.m.
25
50
75
100
150
200
250
300
1
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
3
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
5
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
10
1/2
1/2
1/2
3/4
3/4
3/4
3/4
3/4
15
1/2
3/4
3/4
3/4
3/4
3/4
3/4
3/4
20
3/4
3/4
3/4
3/4
3/4
3/4
3/4
3/4
25
3/4
3/4
3/4
3/4
3/4
1
1
1
30
3/4
3/4
3/4
3/4
1
1
1
1
35
3/4
3/4
1
1
1
1
1
1
40
3/4
1
1
1
1
1
1
1
50
1
1
1
1
1
1
1
1
60
1
1
1
1
1 1/4
1 1/4
1 1/4
1 1/4
70
1
1
1
1
1 1/4
1 1/4
1 1/4
1 1/4
80
1 1/4
1 1/4
1 1/4
1 1/4
1 1/2
1 1/2
1 1/2
1 1/2
100
1 1/4
1 1/4
1 1/4
1 1/4
1 1/2
1 1/2
1 1/2
1 1/2
Check all piping and fittings regularly to avoid 'leaks" in the system
4
