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PVC Pipes Schedule 80 - Friction Loss vs. Water Flow

Water flow in thermoplastic PVC and CPVC pipes Schedule 80 - friction loss (ft/100 ft, psi/100 ft) and flow velocities at dimensions ranging 1/2 to 16 inches.

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Friction loss and flow velocities in PVC and CPVC pipes Schedule 80 with water are indicated in the table below. The table may can be used for pipes in other thermoplastic materials where the inner diameter corresponds to PVC Pipe
Schedule 80

  • 1 ft (foot) = 0.3048 m
  • 1 ft/s = 0.3048 m/s
  • 1 gal (US)/min =6.30888x10-5 m3/s = 0.0227 m3/h = 0.0631 dm3(liter)/s = 2.228x10-3 ft3/s = 0.1337 ft3/min
  • 1 psi/100 ft = 2.3 ftH2O/100 ft = 2288 mmH2O/100 ft = 22.46 kPa/100 m

Note! Velocities should in general not exceed 5 feet per second to avoid noise and damaging wear and tear of pipes and fittings.

The values can be used to calculate minor pressure loss with the Equivalent Pipe Length Method.

1/2 inches
Volume Flow
(gal/min)
 Volume Flow
(gal/hr)		 Velocity
(ft/sec)		 Friction Head
(ftH2O/100 ft)
 Friction Loss
(psi/100 ft)
1 60 1.5 4.0 1.7
2 120 3.0 8.0 3.5
5 300 7.4 45.2 19.6
7 420 10.3 83.1 36.0
3/4 inches
Volume Flow
(gal/min)		 Volume Flow
(gal/hr)		 Velocity
(ft/sec)		 Friction Head
(ft/100ft)		 Friction Loss
(psi/100 ft)
1 60 0.7 0.9 0.4
2 120 1.6 1.7 0.7
5 300 3.9 9.7 4.2
7 420 5.5 11.8 7.7
10 600 7.8 33.8 14.7
15 900 11.8 71.7 31.1
1 inches
Volume Flow
(gal/min)		 Volume Flow
(gal/hr)		 Velocity
(ft/sec)		 Friction Head
(ft/100ft)		 Friction Loss
(psi/100 ft)
2 120 0.9 0.9 0.4
5 300 2.3 2.6 1.2
7 420 3.3 5.0 2.2
10 600 4.7 9.6 4.2
15 900 7.0 20.4 8.8
20 1200 9.4 34.7 15.0
25 1500 11.7 52.4 22.7
30 1800 14.0 73.5 31.8
1 1/4 inches
Volume Flow
(gal/min)		 Volume Flow
(gal/hr)		 Velocity
(ft/sec)		 Friction Head
(ft/100ft)		 Friction Loss
(psi/100 ft)
2 120 0.5 0.2 0.1
5 300 1.3 0.7 0.3
7 420 1.8 1.2 0.5
10 600 2.6 2.3 1.0
15 900 3.9 4.9 2.1
20 1200 5.2 8.3 3.6
25 1500 6.5 12.6 5.4
30 1800 7.8 17.6 7.6
35 2100 9.1 23.4 10.1
40 2400 10.4 30.0 13.0
45 2700 11.7 37.3 16.1
50 3000 13.0 45.3 19.6
1 1/2 inches
Volume Flow
(gal/min)		 Volume Flow
(gal/hr)		 Velocity
(ft/sec)		 Friction Head
(ft/100ft)		 Friction Loss
(psi/100 ft)
2 120 0.4 0.1 0.04
5 300 0.9 0.3 0.1
7 420 1.3 0.6 0.2
10 600 1.9 1.0 0.5
15 900 2.8 2.2 1.0
20 1200 3.8 3.8 1.6
25 1500 4.7 5.7 2.5
30 1800 5.6 8.0 3.4
35 2100 6.6 10.6 4.6
40 2400 7.5 13.6 5.9
45 2700 8.4 16.9 7.3
50 3000 9.4 20.5 8.9
60 3600 11.3 28.7 12.4
2 inches
Volume Flow
(gal/min)		 Volume Flow
(gal/hr)		 Velocity
(ft/sec)		 Friction Head
(ft/100ft)		 Friction Loss
(psi/100 ft)
5 300 0.6 0.1 0.04
7 420 0.8 0.2 0.07
10 600 1.1 0.3 0.1
15 900 1.7 0.6 0.3
20 1200 2.2 1.1 0.5
25 1500 2.8 1.6 0.7
30 1800 3.4 2.3 1.0
35 2100 3.9 3.0 1.3
40 2400 4.5 3.8 1.7
45 2700 5.0 4.8 2.1
50 3000 5.6 5.8 2.5
60 3600 6.7 8.1 3.5
70 4200 7.8 10.8 4.7
75 4500 8.4 12.3 5.3
80 4800 8.9 13.8 6.0
90 5400 10.1 17.2 7.5
100 6000 11.2 20.9 9.1
2 1/2 inches
Volume Flow
(gal/min)		 Volume Flow
(gal/hr)		 Velocity
(ft/sec)		 Friction Head
(ft/100ft)		 Friction Loss
(psi/100 ft)
5 300 0.4 0.05 0.02
7 420 0.5 0.07 0.03
10 600 0.8 0.1 0.05
15 900 1.2 0.3 0.1
20 1200 1.6 0.4 0.2
25 1500 2.0 0.7 0.3
30 1800 2.3 0.9 0.4
35 2100 2.7 1.3 0.5
40 2400 3.1 1.6 0.7
45 2700 3.5 2.0 0.9
50 3000 3.9 2.4 1.1
60 3600 4.7 3.4 1.5
70 4200 5.5 4.5 2.0
75 4500 5.9 5.1 2.2
80 4800 6.2 5.8 2.5
90 5400 7.0 7.2 3.1
100 6000 7.8 8.7 3.8
125 7500 9.8 13.2 5.7
150 9000 11.7 18.5 8.0
3 inches
Volume Flow
(gal/min)		 Volume Flow
(gal/hr)		 Velocity
(ft/sec)		 Friction Head
(ft/100ft)		 Friction Loss
(psi/100 ft)
5 300 0.3 0.02 0.01
7 420 0.4 0.03 0.01
10 600 0.5 0.04 0.02
15 900 0.8 0.09 0.04
20 1200 1.0 0.2 0.07
25 1500 1.3 0.2 0.1
30 1800 1.5 0.3 0.1
35 2100 1.7 0.4 0.2
40 2400 2.0 0.5 0.2
45 2700 2.2 0.7 0.3
50 3000 2.5 0.8 0.4
60 3600 3.0 1.1 0.5
70 4200 3.5 1.5 0.7
75 4500 3.7 1.7 0.7
80 4800 4.0 1.9 0.8
90 5400 4.5 2.4 1.0
100 6000 5.0 2.9 1.3
125 7500 6.2 4.4 1.9
150 9000 7.5 6.2 2.7
175 10500 8.7 8.3 3.6
200 12000 10.0 10.6 4.6
250 15000 12.5 16.0 6.9
4 inches
Volume Flow
(gal/min)		 Volume Flow
(gal/hr)		 Velocity
(ft/sec)		 Friction Head
(ft/100ft)		 Friction Loss
(psi/100 ft)
20 1200 0.6 0.04 0.02
25 1500 0.7 0.06 0.03
30 1800 0.9 0.08 0.04
35 2100 1.0 0.1 0.05
40 2400 1.2 0.1 0.06
45 2700 1.3 0.2 0.07
50 3000 1.4 0.2 0.09
60 3600 1.7 0.3 0.1
70 4200 2.0 0.4 0.2
75 4500 2.2 0.5 0.2
80 4800 2.3 0.5 0.2
90 5400 2.6 0.6 0.3
100 6000 2.9 0.8 0.3
125 7500 3.6 1.2 0.5
150 9000 4.3 1.6 0.7
175 10500 5.0 2.2 0.9
200 12000 5.7 2.8 1.2
250 15000 7.2 4.2 1.8
300 18000 8.6 5.8 2.5
350 21000 10.0 7.8 3.4
400 24000 11.5 9.9 4.3
5 inches
Volume Flow
(gal/min)		 Volume Flow
(gal/hr)		 Velocity
(ft/sec)		 Friction Head
(ft/100ft)		 Friction Loss
(psi/100 ft)
30 1800 0.5 0.03 0.01
35 2100 0.6 0.04 0.02
40 2400 0.7 0.04 0.02
45 2700 0.8 0.06 0.03
50 3000 0.9 0.07 0.03
60 3600 1.1 0.1 0.04
70 4200 1.3 0.1 0.06
75 4500 1.3 0.1 0.06
80 4800 1.4 0.2 0.07
90 5400 1.6 0.2 0.09
100 6000 1.8 0.2 0.1
125 7500 2.3 0.4 0.2
150 9000 2.7 0.5 0.2
175 10500 3.2 0.7 0.3
200 12000 3.6 0.9 0.4
250 15000 4.5 1.3 0.6
300 18000 5.4 1.9 0.8
350 21000 6.3 2.5 1.1
400 24000 7.2 3.2 1.4
450 27000 8.1 4.0 1.7
500 30000 9.0 4.8 2.1
6 inches
Volume Flow
(gal/min)		 Volume Flow
(gal/hr)		 Velocity
(ft/sec)		 Friction Head
(ft/100ft)		 Friction Loss
(psi/100 ft)
50 3000 0.6 0.03 0.01
60 3600 0.8 0.04 0.02
70 4200 0.9 0.05 0.02
75 4500 0.9 0.06 0.03
80 4800 1.0 0.07 0.03
90 5400 1.1 0.08 0.04
100 6000 1.3 0.1 0.04
125 7500 1.6 0.2 0.07
150 9000 1.9 0.2 0.1
175 10500 2.2 0.3 0.1
200 12000 2.5 0.4 0.2
250 15000 3.1 0.6 0.2
300 18000 3.8 0.8 0.3
350 21000 4.4 1.0 0.5
400 24000 5.0 1.3 0.6
450 27000 5.6 1.7 0.7
500 30000 6.3 2.0 0.9
750 45000 9.4 4.3 1.8
1000 60000 12.5 7.2 3.1
8 inches
Volume Flow
(gal/min)		 Volume Flow
(gal/hr)		 Velocity
(ft/sec)		 Friction Head
(ft/100ft)		 Friction Loss
(psi/100 ft)
125 7500 0.9 0.05 0.02
150 9000 1.1 0.05 0.02
175 10500 1.3 0.08 0.03
200 12000 1.4 0.09 0.04
250 15000 1.8 0.1 0.06
300 18000 2.1 0.2 0.09
350 21000 2.5 0.3 0.1
400 24000 2.9 0.3 0.2
450 27000 3.2 0.4 0.2
500 30000 3.6 0.5 0.2
750 45000 5.4 1.1 0.5
1000 60000 7.1 1.8 0.8
1250 75000 8.9 2.8 1.2
1500 90000 10.7 4.0 1.7
10 inches
Volume Flow
(gal/min)		 Volume Flow
(gal/hr)		 Velocity
(ft/sec)		 Friction Head
(ft/100ft)		 Friction Loss
(psi/100 ft)
200 12000 0.9 0.04 0.02
250 15000 1.1 0.05 0.02
300 18000 1.4 0.07 0.03
350 21000 1.6 0.09 0.04
400 24000 1.8 0.1 0.05
450 27000 2.0 0.1 0.06
500 30000 2.3 0.2 0.07
750 45000 3.4 0.4 0.2
1000 60000 4.5 0.6 0.3
1250 75000 5.7 0.9 0.4
1500 90000 6.8 1.3 0.6
2000 120000 9.1 2.2 1.0
2500 150000 11.3 3.3 1.4
12 inches
Volume Flow
(gal/min)		 Volume Flow
(gal/hr)		 Velocity
(ft/sec)		 Friction Head
(ft/100ft)		 Friction Loss
(psi/100 ft)
350 21000 1.1 0.04 0.02
400 24000 1.3 0.05 0.02
450 27000 1.4 0.06 0.03
500 30000 1.6 0.07 0.03
750 45000 2.4 0.2 0.07
1000 60000 3.2 0.3 0.1
1250 75000 4.0 0.4 0.2
1500 90000 4.8 0.6 0.2
2000 120000 6.4 0.9 0.4
2500 150000 8.0 1.4 0.6
3000 180000 9.6 2.0 0.9
3500 210000 11.2 2.7 1.2
4000 240000 12.8 3.4 1.5
14 inches
Volume Flow
(gal/min)		 Volume Flow
(gal/hr)		 Velocity
(ft/sec)		 Friction Head
(ft/100ft)		 Friction Loss
(psi/100 ft)
500 30000 1.3 0.04 0.02
750 45000 2.0 0.09 0.04
1000 60000 2.6 0.2 0.07
1250 75000 3.3 0.3 0.1
1500 90000 3.9 0.3 0.2
2000 120000 5.2 0.6 0.3
2500 150000 6.5 0.9 0.4
3000 180000 7.9 1.2 0.5
3500 210000 9.2 1.7 0.7
4000 240000 10.5 2.1 0.9
4500 270000 11.8 2.6 1.1
5000 300000 13.1 3.2 1.4
5500 330000 14.4 3.8 1.7
6000 360000 15.7 4.5 2.0
6500 490000 17.0 5.2 2.3
7000 420000 18.3 6.0 2.6
16 inches
Volume Flow
(gal/min)		 Volume Flow
(gal/hr)		 Velocity
(ft/sec)		 Friction Head
(ft/100ft)		 Friction Loss
(psi/100 ft)
500 30000 1.0 0.02 0.01
750 45000 1.5 0.05 0.02
1000 60000 2.0 0.08 0.04
1250 75000 2.5 0.1 0.05
1500 90000 3.0 0.2 0.08
2000 120000 4.0 0.3 0.1
2500 150000 5.0 0.5 0.2
3000 180000 6.0 0.6 0.3
3500 210000 7.0 0.9 0.4
4000 240000 8.0 1.1 0.5
4500 270000 9.0 1.4 0.6
5000 300000 10.0 1.7 0.7
5500 330000 11.0 2.0 0.9
6000 360000 12.0 2.3 1.0
6500 490000 13.0 2.7 1.2
7000 420000 14.0 3.1 1.3
7500 450000 15.0 3.5 1.5
8000 480000 16.0 4.0 1.7
8500 510000 17.0 4.4 1.9
9000 540000 18.0 4.9 2.1

Pressure loss values can be calculated with the Hazen-Williams Equation or the Darcy-Weisbach Formula.

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