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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. |
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