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:

MediaHose
Alignment
Maximum Velocity
without Liner (ft./sec.)
liquidstraight75
liquid45° bend56
liquid90° bend37
gasstraight150
gas45° bend112
gas90° bend75

Conversion Formulas

DefinitionsaFeet 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 ÷ 9) 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.
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