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Engineering & Design Data
Flow
Rate
(Gallons/
Minute)
Flow
Velocity
(ft/sec.)
Friction
Loss (Ft.
Water/
100ft)
Friction
Loss
(psi/
100ft)
Flow
Velocity
(ft/sec.)
Friction
Loss (Ft.
Water/
100ft)
FLOW VELOCITY & FRICTION LOSS
Friction
Loss
(psi/
100ft)
Flow
Velocity
(ft/sec.)
Friction
Loss (Ft.
Water/
100ft)
Friction
Loss
(psi/
100ft)
Flow
Velocity
(ft/sec.)
SCHEDULE 80
Friction
Loss (Ft.
Water/
100ft)
Friction
Loss
(psi/
100ft)
Flow
Velocity
(ft/sec.)
GPM 8" 10" 12" 14" 16" 18" 20” 24” GPM
125 0.89 0.04 0.02 125
150 1.07 0.06 0.02 150
175 1.25 0.07 0.03 175
200 1.43 0.10 0.04 0.91 0.03 0.01 200
250 1.78 0.14 0.06 1.13 0.05 0.02 250
300 2.14 0.20 0.09 1.36 0.07 0.03 300
350 2.50 0.27 0.12 1.59 0.09 0.04 1.12 0.04 0.02 350
400 2.85 0.34 0.15 1.81 0.11 0.05 1.28 0.05 0.02 1.06 0.03 0.01 0.81 0.02 0.01 400
450 3.21 0.43 0.19 2.04 0.14 0.06 1.44 0.06 0.03 1.19 0.04 0.02 0.91 0.02 0.01 450
500 3.57 0.52 0.23 2.27 0.17 0.07 1.60 0.07 0.03 1.33 0.05 0.02 1.01 0.02 0.01 500
750 5.35 1.10 0.48 3.40 0.36 0.16 2.40 0.16 0.07 1.99 0.10 0.04 1.52 0.05 0.02 1.19 0.03 0.01 750
1000 7.13 1.87 0.81 4.53 0.62 0.27 3.20 0.27 0.12 2.65 0.17 0.07 2.02 0.09 0.04 1.59 0.05 0.02 1.29 0.03 0.01 1000
1250 5.66 0.94 0.41 4.00 0.40 0.17 3.31 0.25 0.11 2.53 0.13 0.06 1.99 0.07 0.03 1.61 0.04 0.02 1250
1500 6.80 1.32 0.57 4.80 0.57 0.24 3.98 0.36 0.15 3.03 0.18 0.08 2.39 0.10 0.04 1.93 0.06 0.03 1.34 0.03 0.01 1500
2000 6.40 0.96 0.42 5.30 0.61 0.26 4.04 0.31 0.14 3.18 0.18 0.08 2.57 0.10 0.05 1.78 0.04 0.02 2000
2500 6.63 0.92 0.40 5.05 0.48 0.21 3.98 0.27 0.12 3.22 0.16 0.07 2.23 0.06 0.03 2500
3000 7.95 1.29 0.56 6.06 0.67 0.29 4.78 0.37 0.16 3.86 0.22 0.10 2.67 0.09 0.04 3000
3500 7.07 0.89 0.38 5.57 0.50 0.22 4.50 0.30 0.13 3.12 0.12 0.05 3500
4000 6.37 0.64 0.28 5.15 0.38 0.16 3.56 0.15 0.07 4000
4500 7.16 0.79 0.34 5.79 0.47 0.20 4.01 0.19 0.08 4500
5000 6.43 0.57 0.25 4.45 0.23 0.10 5000
5500 7.08 0.68 0.30 4.90 0.28 0.12 5500
6000 7.72 0.80 0.35 5.34 0.33 0.14 6000
7000 6.23 0.44 0.19 7000
7500 6.68 0.49 0.21 7500
8000 7.12 0.56 0.24 8000
8500 7.57 0.62 0.27 8500
Friction
Loss (Ft.
Water/
100ft)
Friction
Loss
(psi/
100ft)
Flow
Velocity
(ft/sec.)
Friction
Loss (Ft.
Water/
100ft)
Friction
Loss
(psi/
100ft)
Flow
Velocity
(ft/sec.)
Friction
Loss (Ft.
Water/
100ft)
Friction
Loss
(psi/
100ft)
Flow
Velocity
(ft/sec.)
Friction
Loss (Ft.
Water/
100ft)
Friction
Loss
(psi/
100ft)
Flow
Rate
(Gallons/
Minute)
NOTE: Spears ® recommends that Flow Velocities be maintained at or below 5 feet per second in large diameter piping systems (i.e. 6" diameter and larger) to minimize the potential for
hydraulic shock. Refer to Spears ® engineering section entitled "Hydraulic Shock" for additional information. Friction loss data based on utilizing mean wall dimensions to determine average
ID; actual ID may vary.
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