What Pressure Can Underground Composite Pipes Withstand? Working Range Explained

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What Pressure Can Underground Composite Pipes Withstand? Working Range Explained

For gas station fuel systems, understanding the pressure rating of underground piping is critical. Choosing pipes with the correct pressure range ensures safe, reliable operation and prevents costly failures.

Standard Working Pressure

High-quality underground composite pipes, such as those from Wohong Petrochemical, are designed to handle a working pressure of 75 PSI (approximately 5.2 bar) for positive pressure applications. They are also capable of handling 29 Hg (inches of mercury) vacuum service, which is essential for suction lines where the dispenser pump pulls fuel from the tank.

What This Means for Your Gas Station

Positive Pressure Lines: These pipes are ideal for the lines running from a submerged turbine pump inside the storage tank to the fuel dispenser. The 75 PSI rating provides a safe margin above the typical operating pressure of 30-50 PSI for such systems.

Vacuum (Suction) Lines: For systems using self-priming pumps within the dispenser, the lines operate under a vacuum. The 29 Hg rating ensures the pipe will not collapse under suction, maintaining a consistent fuel flow.

Vapor Recovery Lines: These pipes also work perfectly for vapor recovery systems, which have their own specific pressure and vacuum requirements.

Why Choose Wohong’s Composite Pipes for Pressure Applications

  1. Compliance with National Standards (GB/T 39997-2021)

Wohong’s composite pipes are manufactured to meet the rigorous requirements of the Chinese national standard GB/T 39997-2021, Thermoplastic pipework for underground installation at petrol filling stations. This standard classifies pipes based on their working pressure, ensuring that you are using a product rated correctly for your station’s needs.

  1. High-Strength Material Construction

These pipes are engineered with specialized thermoplastic materials and reinforcing layers that provide high tensile and burst strength, allowing them to reliably withstand the stated 75 PSI working pressure over decades of service.

  1. Reliable Electrofusion Joints

The pressure rating of a piping system is only as good as its joints. Wohong’s pipes use electrofusion welding, which creates homogeneous, leak-proof connections that are as strong as the pipe itself, eliminating weak points common with threaded or glued joints.

Temperature Considerations

The pressure rating is also temperature-dependent. Wohong’s composite pipes are designed for the standard operating temperature range of -40°C to +65°C for soil, and can handle a maximum fluid temperature of 52°C, ensuring reliable performance in diverse climates.

Conclusion

For safe and reliable gas station operations, you need piping you can trust. Wohong’s underground composite pipes, with a working pressure range of 75 PSI and 29 Hg vacuum, provide the robust performance you need for your fuel handling system.