1.4 Air Compressor
59
(2) Determine the pipe diameter according to the airflow rate.
Criteria for determining the main pipe diameter
•
240 m
3
/H ............21/2 B (65A) or over
•
480 m
3
/H ............3B (80A) or over
•
12,000 m
3
/H .......5B (125A) or over
Carbon steel pipe dimensions for piping
(3) Use the rustproof pipes (for example, galvanized ones).
[ 3 ] Mounting drain ports and valves
(1) Mount drain ports at the pipe rising positions, and at intervals of 20 m on the main pipe.
(2) Mount valves at the delivery port of the air dryer and the branching portions.
[ 4 ] Other precautions
(1) When laying pipes, clean them so that no oil or chips remain inside.
(2) After piping work and before connecting the pipes to the weaving machines, blow air into the pipes to
clean them.
(3) Check the pipeline for air leakage. If any leakage is detected, repair the pipeline.
(4) Lay pipes with downward inclination in the flowing direction so as not to cause drain accumulation in the
piping.
Nominal diameter
OD (mm)
ID (mm)
Section (cm
2
)
A
B
6
1/8
10.5
6.5
0.33
8
1/4
13.8
9.2
0.66
10
3/8
17.3
12.7
1.27
15
1/2
21.7
16.1
2.04
20
3/4
27.2
21.6
3.66
25
1
34.0
27.6
5.98
32
11/4
42.7
35.7
10.01
40
11/2
48.6
41.6
13.59
50
2
60.5
52.9
21.98
65
21/2
76.3
67.9
36.21
80
3
89.1
80.7
51.15
90
31/2
101.6
93.2
68.22
100
4
114.3
105.3
87.09
125
5
139.8
130.8
134.37
150
6
165.2
155.2
189.18
175
7
190.7
180.1
254.75
200
8
216.3
204.7
329.10
225
9
241.8
229.4
413.31
250
10
267.4
254.2
507.51
300
12
318.5
304.7
729.18
