General Information
Flow Data
This table may be used to determine the pressure loss in hose connected to rock drills and pneumatic tools. It is correct
for hose with smooth inside lining. Hose with rough inside lining may have a friction loss of as much as 50% greater than
the figures given in the table.
Air Flow Pressure Loss – Pulsating flow
Size Of
Hose
Gauge
Pressure
at Line
Cubic feet free air per minute passing through 50 foot lengths of hose
Loss of pressure in pounds per square inch – 50 foot hose length
20 30 40 50 60 70 80 90 100 110 120 130 140 150
½
In. With
Couplings
At Each
End
50
1.8 5.0 10.1 18.1
60
1.3 4.0 8.4 14.8 23.4
70
1.0 3.4 7.0 12.4 20.0 28.4
80
.9 2.8 6.0 10.8 17.4 25.2 34.6
90
.8 2.4 5.4 9.5 14.8 22.0 30.5 41.0
100
.7 2.3 4.8 8.4 13.3 19.3 27.2 36.6
110
.6 2.0 4.3 7.6 12.0 17.6 24.6 33.3 44.5
¾
In. with
Couplings
at Each End
50
.4 .8 1.5 2.4 3.5 4.4 6.5 8.5 11.4 14.2
60
.3 .6 1.2 1.9 2.8 3.8 5.2 6.8 8.6 11.2
70
.2 .5 .9 1.5 2.3 3.2 4.2 5.5 7.0 8.8 11.0
80
.2 .5 .8 1.3 1.9 2.8 3.6 4.7 5.8 7.2 8.8 10.6
90
.2 .4 .7 1.1 1.6 2.3 3.1 4.0 5.0 6.2 7.5 9.0
100
.2 .4 .6 1.0 1.4 2.0 2.7 3.5 4.4 5.4 6.6 7.9 9.4 11.1
110
.1 .3 .5 .9 1.3 1.8 2.4 3.1 3.9 4.9 5.9 7.1 8.4 9.9
1
In. with
Couplings
at Each End
50
.1 .2 .3 .5 .8 1.1 1.5 2.0 2.6 3.5 4.8 7.0
60
.1 .2 .3 .4 .6 .8 1.2 1.5 2.0 2.6 3.3 4.2 5.5 7.2
70
.1 .2 .4 .5 .7 1.0 1.3 1.6 2.0 2.5 3.1 3.8 4.7
80
.1 .2 .3 .5 .7 .8 1.1 1.4 1.7 2.0 2.4 2.7 3.5
90
.1 .2 .3 .4 .6 .7 .9 1.2 1.4 1.7 2.0 2.4 2.8
100
.1 .2 .2 .4 .5 .6 .8 1.0 1.2 1.5 1.8 2.1 2.4
110
.1 .2 .2 .3 .4 .6 .7 .9 1.1 1.3 1.5 1.8 2.1
1¼
In. with
Couplings
at Each End
50
.1 .2 .2 .3 .4 .5 .7 1.1
60
.1 .2 .3 .3 .5 .6 .8 1.0 1.2 1.5
70
.1 .2 .2 .3 .4 .4 .5 .7 .8 1.0 1.3
80
.1 .2 .2 .3 .4 .5 .6 .7 .8 1.0
90
.1 .2 .2 .3 .3 .4 .5 .6 .7 .8
100
.1 .2 .2 .3 .4 .4 .5 .6 .7
110
.1 .2 .2 .3 .3 .4 .5 .5 .6
1½
In. with
Couplings
at Each End
50
.1 .2 .2 .2 .3 .3 .4 .5 .6
60
.1 .2 .2 .2 .3 .3 .4 .5
70
.1 .2 .2 .2 .3 .3 .4
80
.1 .2 .2 .2 .3 .4
90
.1 .2 .2 .2 .3
100
.1 .2 .2 .2
110
.1 .2 .2 .2
For longer or shorter lengths of hose, the friction loss is proportional to the length, e.g., for 25 feet, half of the above;
for 150 feet, three times the above, etc.
340
Appendix
C
Air & Multipurpose
General Purpose
Heavy Duty
Push-on
Chemical Transfer
Cleaning Equipment
Food
Transfer
Washdown
Marine
Material Handling
Abrasives
Bulk Transfer
Cement & Concrete
Mining
Petroleum
Aircraft Fueling
Dispensing
Dock
Transfer
Spray
Steam
Vacuum
LPG Delivery
Water
Discharge
Suction & Discharge
Washdown
Welding
Coupling Systems
Equipment
Appendix