The Free On-line Aquaculture Dictionary

Friction Loss - Air

Metric Table

Losses are given as mbar pressure loss per 30m smooth pvc pipe

click here for table in cfm and psi

Diameter (inches) schedule 40 pipe (internal diameter in mm is given in brackets)
Air flow rate m3/hour 1/2"  (15.7) 3/4" (20.9) 1"   (26.6) 1 1/2" (40.9) 2"   (52.5)
8.5 46.852 12.402 4.134 0.689 0
17 167.427 42.029 13.091 1.378 0
25.5 356.213 81.302 27.56 3.445 1.378
34 596.674 142.623 46.163 5.512 2.067
51   310.739 96.46 11.713 3.445
85   799.24 176.384 29.627 8.957
127.5     511.238 62.01 18.603
170     888.81 106.106 31.694
212.5       137.111 46.852
255       224.614 64.077
340       387.907 111.618
425         168.116

CFM and PSI Table

Losses are given as psi pressure loss per 100' pipe smooth pvc pipe

  Diameter (inches) schedule 40 pipe (internal diameter in mm is given in brackets)
Air flow rate cfm 1/2"  (15.7) 3/4" (20.9) 1"   (26.6) 1 1/2" (40.9) 2"   (52.5)
5         0.68         0.18         0.06         0.01         0
10 2.43 0.61 0.19 0.02 0
15 5.17 1.18 0.4 0.05 0.02
20 8.66 2.07 0.67 0.08 0.03
30   4.51 1.4 0.17 0.05
50   11.6 2.56 0.43 0.13
75     7.42 0.9 0.27
100     12.9 1.54 0.46
125       1.99 0.68
150       3.26 0.93
200       5.63 1.62
250         2.44