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Engineering & Design > Flow Velocity

Liners
Liquid or gas applications conveying media at high velocity should incorporate an interlock liner in the hose assembly design. The liner will decrease the turbulence caused by the high velocity and reduce the resonant vibration that may occur. A liner is recommended if the velocity is greater than the following:

Media
Hose
Alignment
Maximum Velocity
without Liner (ft./sec.)
liquid straight 75
liquid 45° bend 56
liquid 90° bend 37
gas straight 150
gas 45° bend 112
gas 90° bend 75

Conversion Formulas

Definitionsa
Feet Per Second
(ft./sec.)
gph: gallons per hour (gph ÷ ID2) x 0.0068
gpm: gallons per minute (gpm ÷ ID2) x 0.4083
cfh: cubic feet per hour (cfh ÷ ID2) x 0.0509
cfm: cubic feet per minute (cfm ÷ ID2) x 3.0558
cfs: cubic feet per second (cfs ÷ ID2) x 183.35
aID = nominal hose size in inches

Example

Given:
    3" nominal hose size
500 gallons per minute flow
Media is water
Hose is installed in 90° bend
Computation:
  From the formula above, (gpm ÷ ID2) x 0.4083 or
(500 ÷ 32) x 0.4083 = 22.68 ft./sec. flow velocity
Result:
  Since the calculated flow velocity of 22.68 ft./sec. is less than 37 ft./sec., a liner is not required for this application.
  TOP

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W-flowvel-0900