Introduce the performance of every kind of gas pipe material and technology-economy comparison is made,how to choose pipe material reasonable is discussed.

The performance,advantages and disadvantages of PE pipe material and the main points in quality management of welding construction are discussed.

Through analysis on the process of unsteady leakage of gas pipeline,the calculating model of unsteady leakage rate has been established.

An integrity management system for Xining gas pipeline was introduced,which has been proved successful.

Performance of speciality HDPE resin for gas pipe;

Differential scanning calorimetry (DSC) tests were carried out on several main polyethylene gas pipes on domestic market by means of Isovelocity Temperature Drop Crystallization and Gradient Isothermal Crystallization.

Studies and analyzes mechanical property, creep crack propagation resistance and melt strength of Qilu PE100 gas pipe speciality resin DGDB2480HBK.

Inquiry into a few issues related to the gas-tight test of outdoor gas pipeline;

The waterpower calculation table exploitation and its application about low pressure branch gas pipelines;

Finite element analysis of residual stress of welding repair for gas pipeline;