pressure reduction of polyethylene PE water supply pipe system to temperature when the polyethylene pipe system is used continuously at a temperature above 20 ℃, if the large working pressure is used for a certain material, as long as the smaller reduction is feasible according to the analysis of GB/T 18252, a reduction coefficient higher than the value can be used. The color of municipal drinking water pipes is blue or black, and the black pipes should have co-extruded blue strips. There are at least three color bars along the longitudinal direction of the pipe.

PE water supply pipe is a kind of PE pipe. There are many kinds of PE pipes, involving many fields, including PE water supply field, PE threading and PE gas transportation. The three are made of polyethylene, but the polyethylene grade is different. Pe polyethylene material is widely used in the field of water supply pipe manufacturing because of its high strength, corrosion resistance and non-toxicity. Because it does not rust, it is an ideal pipe to replace ordinary iron water pipes. PE water supply pipe implementation product national standards: GB/T 13663-2000 "water supply with polyethylene (PE) pipe".

When manufacturing PE pipe, the following three grades of polyethylene PE 63, PE 80 and PE 100 are generally used. The higher the latter number, the more pressure-bearing this polyethylene is. pe80 and pe100 can be used to make gas pipelines, which is more secure. pe63 is generally used to make water supply pipe, performance can be guaranteed.

Other uses Water pipes can be blue and black. Pipes that are exposed to sunlight (e. g. above ground pipes) must be black. The inner and outer surfaces of the pipe should be clean and smooth, and no bubbles, obvious scratches, dents, impurities, uneven color and other defects are allowed. Pipe ends shall be cut flat and perpendicular to the pipe axis. The length of straight pipe is generally 6m,9m and 12m, which can also be agreed by both parties.