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Gas Pipe Sizing
Size natural gas or LPG pipework segments by pressure drop against the 1 mbar (NG) / 2 mbar (LPG) allowance (BS 6891:2015).
The Ensign ToolboxGas Pipe SizingSize natural gas or LPG pipework segments by pressure drop against the 1 mbar (NG) / 2 mbar (LPG) allowance (BS 6891:2015).
Gas & pipe
Pipework path — meter/ECV outlet to the worst-case appliance
m
m
Equivalent length, elbows/tees
kW net
Downstream heat input carried
| Segment | Length | Fittings | Demand | |
|---|---|---|---|---|
| 1 | 3 m | 0.5 m | 30 kW | |
| 2 | 2 m | 0.3 m | 11 kW |
Within allowance0.477 / 1 mbar
Total pressure loss
0.477 mbar
Allowance
1 mbar
Spare margin
0.523 mbar
Segments
2
Segment sizing breakdown
| # | Demand | Flow | Adj. length | Size | Loss/m | Loss | Status |
|---|---|---|---|---|---|---|---|
| 1 | 30.0 kW | 3.054 m³/h | 3.50 m | 22 mm | 0.0792 mbar/m | 0.277 mbar | OK |
| 2 | 11.0 kW | 1.120 m³/h | 2.30 m | 15 mm | 0.0867 mbar/m | 0.199 mbar | OK |