News and Information
Toughness and Medium Requirements of PPH Pipes
Source: Internet Published on:
2026-06-25
The density of PPH pipe falls between that of high‑density and low‑density polyethylene, combining the rigidity and strength of HDPE with excellent flexibility and creep resistance. Moreover, PPH exhibits superior heat‑fusion joining properties, facilitating easy installation. In contrast, seamless steel pipes require corrosion protection and external thread‑rolling during installation, with a service life of only about 30 years. PPH pipe is resistant to corrosion by a wide range of chemical media, eliminating the need for additional anti‑corrosion treatment. Additionally, it does not promote the growth of algae, bacteria, or fungi, offering a service life of up to 50 years.
PPH pipe is a highly resilient piping material with an elongation at break exceeding 500%, offering excellent adaptability to uneven foundation settlement and misalignment, as well as superior seismic performance. Consequently, it is particularly suitable for regions prone to earthquakes. During installation, PPH pipe can be routed around obstacles within its allowable bending radius, thereby reducing construction complexity. Its inner wall is smooth and resistant to scale buildup; the equivalent absolute roughness of the PPH pipe’s inner surface is only one‑twentieth that of steel pipe. For pipes of the same diameter, length, and pressure rating, PPH pipe exhibits approximately 30% greater flow capacity than steel pipe, resulting in significant economic advantages.
PPH pipes are lightweight, easy to handle, and simple to weld, with fewer weld joints. When the pipeline is long, coiled installation can be employed. The trench requirements for PPH pipes are significantly lower than those for steel pipes, and electrofusion welding is an option when site conditions are restrictive. We can also lay the pipes by submerging them underwater, which greatly reduces construction complexity and project costs. PPH pipes are joined by fusion welding, effectively ensuring that the joint material and structure are consistent with the pipe body, achieving seamless integration between the fitting and the pipe. As a result, the tensile strength and burst strength of the joints exceed those of the pipe itself, providing effective resistance to both hoop and axial stresses induced by internal pressure.
Compared with rubber‑ring joints or other mechanical fittings, it eliminates the risk of leakage caused by misalignment and distortion, delivering exceptionally superior sealing performance. PPH pipe is produced through the polymerization of a single propylene monomer; its molecular chains contain no ethylene units, resulting in high chain regularity, high crystallinity, and relatively poor impact resistance. To address the inherent brittleness of PPH pipe, some manufacturers have adopted a blend‑modification approach using polyethylene and ethylene–propylene rubber to enhance toughness; however, this does not fundamentally improve the material’s long‑term thermal stability.
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