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. We dive deeper into this topic here.
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