Qin Yin Kang 1, Shi Jian 1, *, Hou Dong 1, Zheng Jin 1, Guo Wei 2
(1、Zhejiang University Institute of Chemical Machinery, Hangzhou 310027, 2、Zhejiang Special Equipment Inspection Research Institute, Hangzhou 310020)
Abstract:based on the high-density polyethylene (PE-HD) relaxation modulus equation, the long-term mechanical model for pipelines, and the state equation for water, this study investigates the pressure variation patterns during the water pressure test of PE-HD pipes. The study discusses the influence of pipe end constraints, holding time, and temperature. The findings indicate that the type of constraint has a negligible impact on pressure variation; increasing the holding time effectively reduces pressure drop and the rate of pressure drop, thereby improving the stability of the test. As the temperature increases, the pressure drop in the PE-HD pipe water pressure test decreases, and the temperature and pressure drop are approximately linearly related.
Keywords:High-density polyethylene (HDPE) pipe: Pressure, drop, stress relaxation
This article was published in the 1st issue of "China Plastics" in 2018.