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Home > Air Piping & Frictional Loss
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Loss of Air Pressure Due to Friction
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SIZE PIPE @ 1/4 PSI DROP/100 FEET OR LESS
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FREE
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COMPRESSED
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PIPE SIZE
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AIR
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AIR
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1/8"
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1/4"
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3/8"
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1/2"
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3/4"
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1"
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1-1/4"
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1-1/2"
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2"
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CFM
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CFM @ 100 PSIG
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PRESSURE DROP OF AIR, PSI, PER 100 FEET OF SCH 40 PIPE @100 PSIG, 60 DEG F.
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1
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0.128
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0.361
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0.083
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0.018
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2
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0.256
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1.310
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0.285
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0.064
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0.020
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3
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0.384
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3.060
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0.605
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0.133
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0.042
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4
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0.513
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4.830
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1.040
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0.226
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0.071
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3/4"
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5
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0.640
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7.450
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1.580
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0.343
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0.106
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0.027
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6
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0.769
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10.600
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2.230
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0.408
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0.148
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0.037
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1"
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8
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1.025
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18.600
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3.890
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0.848
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0.255
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0.062
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0.019
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10
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1.282
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28.700
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5.960
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1.260
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0.356
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0.094
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0.029
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15
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1.922
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13.000
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2.730
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0.834
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0.201
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0.062
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1 1/4"
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20
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2.563
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22.800
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4.760
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1.430
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0.345
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0.102
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0.026
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1 1/2"
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25
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3.204
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35.600
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7.340
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2.210
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0.526
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0.156
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0.039
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0.019
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30
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3.845
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10.500
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3.150
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0.748
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0.219
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0.055
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0.026
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35
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4.489
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14.200
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4.240
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1.000
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0.293
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0.073
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0.035
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40
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5.126
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18.400
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5.490
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1.300
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0.379
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0.095
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0.044
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45
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5.767
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23.100
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6.900
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1.620
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0.474
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0.116
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0.055
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2"
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50
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6.408
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28.500
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8.490
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1.990
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0.578
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0.149
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0.067
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0.019
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60
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7.690
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40.700
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12.200
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2.850
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0.819
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0.200
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0.094
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0.027
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70
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8.971
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2-1/2"
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16.500
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3.830
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1.100
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0.270
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0.126
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0.036
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80
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10.250
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0.019
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21.400
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4.960
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1.430
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0.350
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0.162
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0.046
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90
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11.530
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0.023
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27.000
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6.250
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1.800
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0.437
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0.203
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0.058
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100
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12.280
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0.029
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33.200
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7.690
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2.210
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0.534
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0.247
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0.070
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125
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16.020
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0.044
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3"
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11.900
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3.390
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0.825
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0.380
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0.107
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150
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19.220
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0.062
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0.021
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17.000
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4.870
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1.170
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0.537
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0.151
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175
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22.430
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0.083
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0.028
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23.100
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6.600
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1.580
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0.727
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0.205
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200
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25.630
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0.107
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0.036
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3-1/2"
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30.000
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8.540
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2.050
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0.937
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0.264
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225
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28.840
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0.134
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0.045
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0.022
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37.900
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10.800
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2.590
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1.190
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0.331
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250
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32.040
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0.164
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0.055
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0.027
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13.300
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3.180
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1.450
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0.404
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275
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35.240
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0.191
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0.066
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0.032
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16.000
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3.830
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1.750
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0.484
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300
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38.450
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0.232
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0.078
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0.037
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19.000
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4.560
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2.070
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0.573
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325
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41.650
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0.270
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0.090
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0.043
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22.300
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5.320
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2.420
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0.673
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350
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44.870
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0.313
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0.104
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0.050
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4"
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25.800
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6.170
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2.800
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0.776
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375
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48.060
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0.356
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0.119
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0.057
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0.030
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29.600
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7.050
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3.200
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0.887
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400
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51.260
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0.402
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0.134
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0.064
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0.034
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33.600
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8.020
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3.640
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1.000
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425
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54.470
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0.452
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0.151
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0.072
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0.038
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37.900
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9.010
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4.090
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1.130
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450
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57.670
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0.507
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0.168
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0.081
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0.042
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10.200
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4.590
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1.260
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475
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60.880
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0.562
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0.187
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0.089
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0.047
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11.300
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5.090
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1.400
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500
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64.080
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0.623
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0.206
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0.099
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0.052
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12.500
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5.610
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1.550
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550
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70.490
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0.749
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0.246
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0.118
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0.062
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15.100
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6.790
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1.870
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600
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76.900
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0.887
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0.293
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0.139
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0.073
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18.000
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8.040
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2.210
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650
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83.300
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1.040
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0.342
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0.163
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0.086
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5"
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21.100
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9.430
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2.600
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700
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89.710
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1.190
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0.395
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0.188
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0.099
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0.032
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24.300
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10.900
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3.000
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750
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96.120
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1.360
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0.451
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0.214
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0.113
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0.036
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27.900
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12.600
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3.440
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800
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102.500
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1.550
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0.513
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0.244
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0.127
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0.041
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31.800
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14.200
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3.900
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850
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108.900
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1.740
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0.576
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0.274
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0.144
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0.046
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35.900
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16.000
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4.400
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900
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155.300
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1.950
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0.642
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0.305
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0.160
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0.051
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6"
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40.200
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18.000
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4.910
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950
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121.800
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2.180
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0.715
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0.340
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0.178
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0.057
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0.023
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20.000
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5.470
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1000
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128.200
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2.400
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0.788
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0.375
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0.197
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0.063
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0.025
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22.100
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6.060
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1100
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141.000
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2.890
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0.948
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0.451
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0.236
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0.075
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0.030
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26.700
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7.290
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1200
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153.800
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3.440
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1.130
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0.533
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0.279
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0.089
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0.035
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31.800
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8.630
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1300
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166.600
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4.010
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1.320
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0.626
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0.327
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0.103
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0.041
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37.300
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10.100
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1400
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179.400
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4.650
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1.520
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0.718
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0.377
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0.119
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0.047
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11.800
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1500
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192.200
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