TPEP anticorrosive steel pipe is also known as plastic coated pipe, steel-plastic composite pipe, plastic-coated composite steel pipe, matrix of steel pipe, by spraying, rolling, tilting, suction process of steel pipe (pipe) inner surface welding a layer of plastic corrosion layer or plastic steel corrosion layer of plastic composite steel pipe on the internal and external surface welding.
The main inspection methods include appearance inspection, pinhole test, bending test, flattening test, low temperature test and so on. Plastic coated steel pipe is a kind of green steel pipe with anti-corrosion, anti-corrosion, non-toxic, non-radiation and other characteristics, which is widely used in the transportation of various fluids.
Manufacturers commonly used testing methods for coated steel pipes:
- Appearance inspection is to check the appearance quality of the coated steel pipe with the naked eye.
- Thickness measurement is to measure the thickness of the coating at any four points on any two sections directly intersecting the circumference.
- Pinhole test refers to the EDM leak detector to check the EDM coated on the steel pipe under the specified test voltage, and also to check whether there is an EDM.
- The bending test is generally carried out on the bending machine or mold. It is worth noting that during the bending test, the tube is not filled and the weld is located on one side of the main bending surface.
- The flattening test is to place the sample between two plates, and gradually compress the distance between the two plates to four-fifths of the outer diameter of the sample on the pressure testing machine. Flattening means that the weld of the coated steel pipe is perpendicular to the direction of load action.
- Low temperature experiment means that the sample is placed in a low temperature box for 1 hour, and then placed in a normal temperature environment. These methods monitor product compliance.
