By using advanced programming language,according to the waterpower computing formula of gas pipeline in City Gas Design Criterion(GB50028-93),the author worked out the Simple Waterpower Calculation Program,which applies to the calculation of low pressure and middlehigh pressure ramiform gas pipeline.

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;

The problems existing in concealed gas pipe and resolving measures

This article describes the basic principle of the calculation for gas pipe resistance.

The author intruduces the characteristics of city gas pipe installation, the points of supervision ?inspection and his suggestion.

The reasons for fire and explosion accident of pipeline gas and bottled LPG are analyzed.

The fault tree for leakage of pipeline gas is given using fault tree analysis method.

The characteristics of different development stages and the corresponding marketing strategies of franchising corporation of pipeline gas are analyzed,and the marketing procedures and risk for large industrial clients are discussed.

Application of interluding method with plastic pipes inrehab and alteration of old gas pipes;