Recommended Water Velocity

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Pump discharge - 8 to 12 fps (2,44 to 3,65 m/s)

Pump suction - 4 to 7 fps (1,22 to 2,13 m/s)

Header - 4 to 15 fps (1,22 to 4,57 m/s)

Riser - 3 to 10 fps (0,92 to 3,05 m/s)

Drain line 4 to 10 fps

SMALL PIPES: aprox. 5 ft/sec ( 1,52 m/s)

LARGER PIPES : 8 10 ft/sec (2,44 3,05 m/s)

Maximum water velocity to minimize erosion based on normal operation in hours / year

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1500 hrs/year - 15 fps

2000 hrs/year - 14 fps

3000 hrs/year - 13 fps

4000 hrs/year - 12 fps

6000 hrs/year - 10 fps

8000 hrs/year - 8 fps

Velocity is only one part of the selection. Also check the friction loss in feet of water per 100 feet. I

normally use in the range of 1.5 to 6.

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The fluid flow velocities in water systems should not exceed certain limits to avoid noise and damaging

wear and tear of pipes and fittings. The table below can be used as guidance to maximum velocities:

Application Maximum Velocity

(m/s) (ft/s)

Tap water (low noise) 0.5 - 0.7 1.6 - 2.3

Tap water 1.0 - 2.5 3.3 - 8.2

Cooling water 1.5 - 2.5 4.9 - 8.2

Suction boiler feed water 0.5 - 1.0 1.6 - 3.3

Discharge boiler feed

water 1.5 - 2.5 4.9 - 8.2

Condensate 1.0 - 2.0 3.3 - 6.5

Heating circulation 1.0 - 3.0 3.3 - 9.8