Pipeline erosion is mainly divided into two categories: internal erosion and external erosion; Erosion, mainly because the line metal material with external environment such as soil, water, air and other corrosive medium place caused by erosion, at the same time, because some pipeline external thermal insulation layer, may be because other factors under water in the thermal insulation layer extraction (sometimes due to the high temperature of tube medium makes the external water heating) high corrosive erosion area, Underthermal erosion of pipelines.

In addition to the above types, other forms of erosion that may occur include stray current erosion (also known as vagal current), galvanic erosion (caused by electrical connection with other metals), and so on.

Including acid erosion, chloride ion induced erosion, microbial erosion, stress erosion, welding erosion and so on.

In addition, the types of internal erosion are different according to the different properties of the fluid in the pipeline.

It is difficult to specify the form of internal erosion unless the type of fluid inside the line is determined.