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.

To figure out maximum allowable flow rate for Penflex 700 and P5 Series hoses, 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 4.72 141.5 2.36
7xx-006 3/8″ 544.4 9.08 272.2 4.54
7xx-008 1/2″ 923.4 15.4 461.7 7.7
7xx-012 3/4″ 1,882.7 31.4 941.4 15.7
7xx-016 1″ 3,309.8 55.2 1,654.9 27.6
7xx-020 1-1/4″ 5,156.6 86 2,578.3 43
7xx-024 1-1/2″ 8,034.6 134 4,017.3 67
7xx-032 2″ 11,770.1 196.3 5,885.1 98.15
7xx-048 3″ 26,482.5 441.67 13,241.3 220.835
7xx-064 4″ 47,068.6 785 23,534.3 392.5
7xx-080 5″ 72,911.4 1,216 36,455.7 608
7xx-096 6″ 104,930 1,750 52,465 875
7xx-128 8″ 179,880 3,000 89,940 1,500
7xx-160 10″ 275,816 4,600 137,908 2,300
7xx-192 12″ 407,728 6,800 203,864 3,400
7xx-224 14″ 509,660 8,500 254,830 4,250
7xx-256 16″ 689,540 11,500 344,770 5,750
7xx-288 18″ 869,420 14,500 434,710 7,250
7xx-320 20″ 1,079,280 18,000 539,640 9,000
7xx-352 22″ 1,319,120 22,000 659,560 11,000
7xx-384 24″ 1,588,940 26,500 794,470 13,250

Where the flow velocity exceeds these rates, an interlocked metal hose liner or larger hose I.D. is recommended. We dive deeper into this topic here.

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

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