Air Pressure
Some common cause of low air pressure
- Demand is too high for supply — machines do not perform at peak efficiency
- Air leaks — plant average is 20% of lost capacity
- Undersized piping or connections
- Friction loss from length, pipe bends, old pipes with internal corrosion
| Characteristics Of Air Pressure in Hose |
| Pressure Drop Due to Friction in Hose 100 psi 50 Foot Lengths |
| cfm |
Hose Inside Diameter |
|
| |
1/4" |
3/8" |
1/2" |
3/4" |
1" |
| 10 |
1.6 |
0.7 |
— |
— |
— |
| 20 |
9.0 |
4.1 |
0.7 |
0.2 |
— |
| 30 |
26.8 |
8.6 |
2.3 |
0.4 |
0.1 |
| 40 |
43.7 |
17.5 |
4.8 |
0.6 |
0.2 |
| 50 |
60.6 |
29.6 |
8.4 |
1.0 |
0.2 |
| 60 |
— |
49.7 |
13.3 |
1.4 |
0.4 |
| Characteristics Of Air Pressure in Pipe |
| Pressure Drop Due to Friction in Pipe 100 psi 50 Foot Lengths |
| cfm |
Nominal Pipe Size |
|
| |
1/4" |
3/8" |
1/2" |
3/4" |
1" |
| 10 |
1.8 |
0.5 |
0.3 |
— |
— |
| 20 |
9.4 |
4.7 |
1.3 |
0.2 |
— |
| 30 |
28.6 |
9.2 |
3 |
0.5 |
0.13 |
| 40 |
46.3 |
18.7 |
5.1 |
0.8 |
0.23 |
| 50 |
64.4 |
31 |
9.6 |
1.3 |
0.35 |
| 60 |
— |
53.2 |
15.0 |
1.9 |
0.50 |
| Recommended Air Hoses |
Approx. Air Consumption
(cfm) |
Minimal Air Hose Size (inches)
Length of Run |
| |
0'-10' |
10'-50' |
50'-200' |
| 0-20 |
5/16 |
3/8 |
1/2 |
| 20-40 |
3/8 |
1/2 |
1/2 |
| 40-75 |
1/2 |
1/2 |
3/4 |
| 75-120 |
3/4 |
3/4 |
1 |
| 120-140 |
1 |
1 |
1-1/4 |
