Baldor BD Series - Pipeline Sizing Selection

BALDOR AIR COMPRESSOR
21
supply air by special line or install storage tank near the air compressor to relieve the load, making the
pressure stable.
c. the selection of pipeline size
There is friction resistance in the pipe line and resistance is produced in the valve, joint, bend and the
changed diameter pipe when the air flows in the pipe, leading to the loss of air pressure. The pressure
drop of a section pipe line can be calculated in the table below.
Table 7-1 air flow-pressure drop of pipe line
2
/ cmKg
-(100 m)
air flow
min/
3
m
（
inch
）
pipe diameter
1/2
3/4
1
1 1/2
1 3/4
2
2 1/2
3
0.8
5.87
1.23
0.339
0.858
0.038
1.0
9.18
1.92
0.53
0.134
0.059
0.0157
1.6
23.5
4.9
1.36
0.343
0.152
0.0428
1.8
62.0
6.20
1.72
0.434
0.192
0.0541
2.0
7.66
2.12
0.536
0.237
0.0668
0.0177
2.2
9.26
2.56
0.649
0.287
0.0808
0.0214
2.4
11.0
3.15
0.772
0.342
0.0967
0.0255
2.6
12.9
3.58
0.906
0.401
0.113
0.0299
3.0
17.2
4.77
1.21
0.533
0.150
0.0398
0.0168
air flow
min/
3
m
（inch）pipe diameter
3/4
1
1 1/2
1 3/4
2
2 1/2
3
3 1/2
3.4
22
6.13
1.55
0.684
0.193
0.0511
0.0203
3.8
7.66
1.94
0.855
0.241
0.0636
0.0264