Corrugated Metal Hose and Flow Velocity Consideration
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.
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