The refrigeration application of natural gas heat pump in South China region can play a role of peak shaving and valley filling for both electric network and gas network.

This article sums up the experience of central heating sub -network in the past 5 years and points out the optimum selection of heating mode - natural gas heating resource should be made in new residence quarters.

The foreign standards on natural gas calorific value and measures for solving gas interchangeability are introduced.

Bypass velocity control of gas pipeline defect inspection tools;

Leak detection on gas pipeline with the distributed fiber-optic sensing technology;

Fracture control of gas pipeline

Application of dust detection device in high pressure natural gas pipeline;

With the initiation of such important national natural gas pipeline project as Sichuan-to-East gas transmission,to develop pipeline simulation software with independent intellectual property is on the trend.

This paper introduces the investigation results of Carsbad natural gas pipeline accident, and points out that the internal corrosion control is the direct cause for this accident.