air pressure loss in standard power tool hoses

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Excessive pressure drop is the most common cause of complaints involving "loss of power" in portable air tools.  When such a complaint arises, be sure that someone takes a pressure reading at the tool while the tool is turned on ... governed tools while under load.

The most common causes of excessive pressure drop are restrictions to air flow in long lengths of small diameter pipes and hoses, in hose fittings, filters, lubricators, and especially in quick disconnect couplings.  For large volumes of air, large lines and fittings are required.

We offer two charts below.

  • based on 90 PSI line pressure

  • basedon 100 PSI line pressure

 

Air
Flow
CFM
Air Pressure Loss (PSI) in Standard power tool hoses
Based on 90 psi Line Pressure
Hose Number and Size
1/4" x 8' 5/16" x 8' 3/8" x 10' 3/8" x 20' 1/2" x 12" 1/2" x 25"
10 3 2 1 1    
11 4 2 1 1.5    
12 5 2 2 2    
13 5.5 2.5 2 3    
14 6 2.5 2 3    
15 6.5 2.5 2 4 0 0
16 7. 3 2.5 4.5    
18 59 3.5 3 5    
20 12 4 3.7 6 .1 .3
25 18 5.5 6 7.5 .7 .8
30 28 8 8.5 10.5 1.8 1.0
35 44 11 10 15 1.2 1.6
40   13 14 19.7 2.2 2.5
50   22 21.5 28.5 3 3.4
60   33 33 45 3.2 4


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Air
Flow
CFM
Air Pressure Loss (PSI) in Standard power tool hoses
Based on 100 psi Line Pressure
Hose Number and Size
1/4" x 10' 5/16" x 8' 3/8" x 10' 1/2" x 12 1/2 1/2" x 25' 1/2" x 50' 3/4" x 12.5' 3/4" x 25' 3/4" x 50' 1/2" x 50' + 1/4" x 10' 1/2" x 50' + 3/8" x 10' 1/2" x 50' + 5/16" x 10' 1/2/" x 50' + 1/2" x 12.5' 3/4" x 50' + 1/2" x 25' 3/4" x 50' + 3/4" x 12.5'
10 - 11 5.0 0.9               5.3 0.7 1.4      
11 - 12 5.9 1.0               6.2 0.8 1.6      
12 - 13 6.8 1.2 0.4             7.2 0.9 1.9      
13 - 14 8.0 1.4 0.5             8.4 1.1 2.2      
14 - 15 9.3 1.3 0.6             9.8 1.3 2.5      
15 - 16 11.0 1.9 0.7             11.6 1.5 2.9      
16 - 18 14.0 2.4 0.8             15.0 1.9 3.5 1.7    
18 - 20 19.6 3.0 1.0             21.4 2.4 4.5 2.0    
20 - 25   4.3 1.4 0.7 1.0 1.3         3.5 6.4 2.6 1.3  
25 - 30   6.6 2.1 1.0 1.5 2.3         5.2 9.8 3.8 1.9  
30 - 35   9.5 3.1 1.3 2.1 3.6         7.3 13.7 5.3 2.6  
35 - 40   12.8 4.2 1.7 2.8 5.2         9.6 18.4 7.1 3.5  
40 - 50   19.3 6.3 2.4 4.1 8.0         14.0   10.4 5.2 1.8
50 - 60     9.6 3.7 6.3 12.2         21.8   16.0 7.8 2.3
60 - 70     13.5 5.3 9.0 17.4 0.9 1.4 1.9       22.8 11.1 3.0
70 - 80     18.7 7.1 12.4   1.1 1.7 2.5         15.0 3.7
80 - 90     25.0 9.0 16.1   1.4 2.2 3.2         19.8 4.6
90 - 100       11.0     1.7 2.7 4.0           5.8
100 - 120             2.3 3.5 5.6           7.9
120 - 140             3.2 4.8 8.0           11.2
140 - 160             4.6 6.6 11.0           15.5
160 - 180             5.6 8.7 15.2           20.4
180 - 200             7.2 11.0              
200 - 220             9.0                


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