At present, there are two standards for 3PE anti-corrosion steel pipes
, namely GB/T 23257-2009 and GB/T 23257-2017. GB/T 23257-2017 is a new standard, implemented in December 2017. The two standards differ mainly in the following ways:
3PE anti-corrosion steel pipe
1. The design temperature of the anti-corrosion layer is different. The old standard (GB/T 23257-2009) room temperature is 50 degrees, high temperature is 70 degrees, room temperature is 60 degrees, and high temperature is 80 degrees.
2.3 The thickness of the anti-corrosion layer of the PE anti-corrosion steel pipe weld is not less than 70% of the old standard and 80% of the new standard.
3. The thickness of the old standard epoxy powder is greater than or equal to 120 microns, the diameter of the new standard steel pipe is less than 500 and greater than or equal to 120 microns, and the diameter of the steel pipe is greater than or equal to 500 and greater than or equal to 150 microns.
4. The new and old standards are the same for the total thickness of the anti-corrosion layer less than 1200. For diameters larger than 1200, the old standard is 3.0 mm and the reinforced grade is 3.7 mm, and the new standard is 3.3 mm and the reinforced grade is 4.2 mm.
5. Everything else is better than the old standard.