Failure Mode and the Prevention and Control Technology of Buried PE Pipeline in Service: State of the Art and Perspectives

Table 2

Distributions of main leakage points for steel and PE pipes.

Locations	Steel pipes	PE pipes
Joints	Welding interface, tee interface, elbow interface, all kinds of wiring points	Conversion joint between steel pipes and PE pipes
Piercing points	Corrosion perforation points	Thermal fusion welding points
Cracking points	Welding point cracking	Aging damage points
Other points	Underground gas facility interface