Because of the long service life, buried pipelines can't be dug out frequently for inspection, and when they are corroded and damaged by external forces, they can't be detected in time, which is easy to cause a lot of gas leakage. At the same time, with the development of the city, the local pipeline position of the gas pipeline network has changed. Due to road widening and other reasons, the gas pipeline is placed under the driveway, which is easy to cause pipeline compression damage and gas leakage. Problems in the connection of some underground pipeline ancillary facilities, such as valves and flanges, can also lead to gas leakage.

(2) Failure of safety protection devices of equipment and facilities leads to gas leakage.

Mainly, the safety valve, explosion-proof valve, explosion-proof disk, pressure relief valve and alarm system on the pipeline system failed, the explosion-proof appliances in dangerous areas were not explosion-proof, the electrostatic grounding was unreliable, and the lightning protection device failed.

(3) The safety management measures of gas supply enterprises are not in place, and they lack emergency rescue expertise and equipment.

There are dead ends in the training of operators in each position, the rules and regulations and operating procedures are not perfect, the emergency rescue plan is not specific, the desktop drills and actual drills are not carried out as required, and the ability to deal with accidents is lacking.

(4) Business operators violate business rules and regulations.

When operating, the operator did not strictly follow the pipeline gas operation rules, or even violated the rules, resulting in accidents.

(5) Users violate regulations and neglect monitoring.