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Selection

When the pipeline conveying the natural gas, liquefied petroleum gas and artificial gas, the design pressure should not exceed the maximum allowable working pressure pipeline. The maximum allowable working pressure should be consistent with the provisions of the following table.

Urban gas species Maximum allowable working pressure MPa
PE 80 PE 100
SDR11 SDR17.6 SDR11 SDR17.6
Natural gas 0.50 0.30 0.70 0.40
Liquefied petroleum gas Mixed air 0.40 0.20 0.50 0.30
Gaseous state 0.20 0.10 0.30 0.20
Artificial gas Dry gas 0.40 0.20 0.50 0.30
Others 0.20 0.10 0.30 0.20

When the working temperature of polyethylene gas pipeline is above 20 Celsius degrees, the maximum allowable working pressure shall be reduced according to the reduction coefficient of working temperature on working pressure of pipeline, and the reduction factor shall be in accordance with the provisions of the following table.

Working temperature t -20℃t20℃ 20℃<t30℃ 30℃<t40℃
Pressure reduction coefficient 1.00 0.90 0.76

 

 
 

 

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