Gas Pipes - Low Pressure Sizing
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With more than one consumer supplied from a service pipe a diversity in consumption as indicated below can be expected:
| No. of Apartments | Nominal Size of Gas Pipe (inches) | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Length of Service Pipe (feet) | |||||||||
| 20 | 40 | 50 | 60 | 70 | 80 | 90 | 100 | 110 | |
| 4 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| 8 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| 10 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| 12 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2.5 |
| 14 | 2 | 2 | 2 | 2 | 2 | 2.5 | 2.5 | 2.5 | 2.5 |
| 16 | 2 | 2 | 2 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 |
| 20 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 |
| 24 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 3 |
| 30 | 2.5 | 2.5 | 2.5 | 2.5 | 3 | 3 | 3 | 3 | |
| 40 | 2.5 | 2.5 | 3 | 3 | 3 | 3 | 3 | 3 | 4 |
| 48 | 3 | 3 | 3 | 3 | 3 | 4 | 4 | 4 | 4 |
.
| No. of Apartments | Nominal Size of Gas Pipe (inches) | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Length of Service Pipe (feet) | |||||||||
| 120 | 130 | 140 | 150 | 160 | 170 | 180 | 190 | 200 | |
| 4 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| 8 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| 10 | 2 | 2 | 2 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 |
| 12 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 |
| 14 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 |
| 16 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 |
| 20 | 2.5 | 2.5 | 2.5 | 3 | 3 | 3 | 3 | 3 | 3 |
| 24 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| 30 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| 40 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
| 48 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
- 1 ft (foot) = 0.3048 m
The table is based on schedule 40 steel pipe and can be used for a low pressure services lines with pressure head 6 inH2O and gas with 0.6 specific gravity and pressure drop 0.3 inH2O.
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