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Creep Behavior of PVC in Underground Applications

Picture of Gerrit Jan Wilpshaar Gerrit Jan Wilpshaar Jun 10, 2025 12:11:23 PM

PVC Material and Properties
Creep Behavior of PVC in Underground Applications
Creep Behavior of PVC in Underground Applications
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The long-term performance of plastic pipes, particularly those installed underground, is significantly influenced by creep. Creep is higher for Polyolefin (PO) materials compared to PVC.

52Impact on Buried Pipes

For buried pipes, creep plays a crucial role. In non-pressure applications like sewers, the relaxation of tensions under constant deformation is a main factor. This state of constant deflection is observed in flexible buried pipes after soil settlement occurs. Creep can also affect the long-term tightness of rubber ring joints, especially in pipes with thin sidewalls from deep profiles, as it can lower the contact pressure required for the elastomeric seal.

Applications

This property difference is particularly relevant for buried pressure and non-pressure piping systems, including sewers and drainage where soil loads and sealing integrity over time are critical.

 

FAQ Section

How does creep affect plastic pipes when buried?

For buried flexible pipes experiencing constant deflection from soil settlement, creep causes relaxation of tensions over time.

 

Is creep more of a concern for pressure or non-pressure buried pipes?

While relevant for buried pressure pipes, creep is highlighted as a main factor for non-pressure pipes concerning relaxation under constant deformation and affecting joint seals.