Engineering Bulletin

Corrugated Metal Hose and Flow Velocity Consideration

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The flow velocity in corrugated metal hose should never exceed 150 ft./sec. for gas or 75 ft./sec. for liquids otherwise a resonant vibration can occur. Resonant vibration may cause very rapid failure of the assembly.

For a quick way to figure out maximum allowable flow rate, please refer to the table below:

Maximum Permissible Flow Rates

GAS LIQUID
Product ID Hose ID (in.) CFH
( ft3/hour)
CFM
( ft3/min.)
CFH
( ft3/hour)
CFM
( ft3/min.)
7xx-004 1/4″ 283.0 4.72 141.5 2.36
7xx-006 3/8″ 544.5 9.08 272.3 4.54
7xx-008 1/2″ 923.5 15.4 461.8 7.70
7xx-012 3/4″ 1884.0 31.4 942.0 15.70
7xx-016 1″ 3308.0 55.2 1654.0 27.6
7xx-020 1-1/4″ 5160.0 86 2580 43.0
7xx-024 1-1/2″ 8040.0 134 4020.0 67.0
7xx-032 2″ 11775.0 196.3 5887.5 98.2
7xx-048 3″ 26500.0 441.67 13250.0 221.0
7xx-064 4″ 47100.0 785.0 23400.0 390.0
7xx-080 5″ 72960.0 1216.0 36600.0 610.0
7xx-096 6″ 105000.0 1750.0 52500.0 875.0
7xx-128 8″ 180000.0 3000.0 90000.0 1500.0
7xx-160 10″ 276000.0 4600.0 138000.0 2300.0

Where the flow velocity exceeds these rates, an interlocked metal hose liner or larger hose I.D. is recommended.

If you have any questions or comments, please contact us.

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