PVC Pipes - Friction Loss and Flow Velocity - Schedule 80

Water flow in thermoplastic PVC and CPVC pipes Schedule 80 - friction loss and flow velocities at dimensions from 1/2 inch to 16 inches

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

Note! Velocity should not exceed 5 feet per second.

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

1/2 inches
Volume Flow (gal/min)	Volume Flow (gal/hr)	Velocity (ft/sec)	Friction Head (ft/100ft)	Friction Loss (lb/in², psi)
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 (lb/in², psi)
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 (lb/in², psi)
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 (lb/in², psi)
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 (lb/in², psi)
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 (lb/in², psi)
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 (lb/in², psi)
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 (lb/in², psi)
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 (lb/in², psi)
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 (lb/in², psi)
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 (lb/in², psi)
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 (lb/in², psi)
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 (lb/in², psi)
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 (lb/in², psi)
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 (lb/in², psi)
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 (lb/in², psi)
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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