Plastic steel pipes, also known as plastic pipes, steel -plastic composite pipes, and plastic composite steel pipes. They are based on steel pipes. Steel -plastic composite steel pipes on the surface and outside surface melt.
1. Appearance check
Check the appearance quality of the plastic steel pipe.
2. Thickness measurement
Take two horizontal sections of different lengths from the ends of the plastic steel pipe, and use an electromagnetic thickness meter to measure the thickness of the coating thickness of the four -point coating at each horizontal section.
3. Pixel test
The length of the tube section is about 1000mm. The steel pipe coatings are checked under the specified test voltage with an electric spark leakage instrument. The thickness of the coating is not greater than 0.4mm. 2000 V. Check whether there are electric sparks.
4. Attachment force test
The adhesion test is performed according to 7.4.2 in CJ/T 120-2008, and the test results shall comply with the 5.6 regulations.
5. Bend test
DN ≤50mm coated steel pipes for bending test. The length of the pipe section is (1200 ± 100) mm.
In an environment with a temperature of (20 ± 5) ° C, the curvature radius is 8 times the diameter of the nominal nominal diameter of the steel pipe, and the curved angle is 30O. There is no filling inside the tube during the bending test, and the weld is located on the side of the curved main surface.
After the test, the test parts are cut off from the middle of the curved arc to check the inner coating. The test results should comply with 5.7 regulations.
6. Flanched test
DN> 50 mm coating steel pipes for flattening test. The size of the tube section is (50 ± 10) mm.
In an environment with a temperature of (20 ± 5) ° C, the test parts are placed between the two tablets, and the distance between the two tablets is gradually compressed to four -fifth of the diameter of the test parts on the pressure test machine. The steel pipe weld is perpendicular to the direction of the load. After the test, check the internal coating, and the test results shall comply with 5.8 regulations.
7. Inspeal test
Cut a sample of about 100 mm from any position of the coating steel pipe. In an environment with a temperature of (20 ± 5) ° C, the weld should be in the opposite direction of the impact. The test results should comply with the 5.9 regulations.
Plastic steel pipes have excellent corrosion resistance and relatively small friction resistance. Epoxy resin coating plastic steel pipes are suitable for transporting the medium of drainage, seawater, warm water, oil, gas and other media, and polyvinyl chloride coating steel pipes are suitable for transmission of medium such as drainage, seawater, oil, and gas.
Plastic steel pipes not only have the advantages of high strength, easy connection, and water -resistant impact of steel pipes, but also overcomes the shortcomings of the steel pipes that are easy to corrode, pollution, scaling and plastic tube strength, poor fire performance, etc., and the design life can reach 50 50 Year.
