HDPE Gas Pipe Internationally, the polyethylene pipe material is divided into PE32, PE40, PE63, PE80, PE100 five grades, and for the gas pipe and water pipe material is mainly PE80 and PE100. China's polyethylene pipe material is not graded, which makes the domestic polyethylene gas pipe and water pipe manufacturers to choose raw materials more difficult, but also to the use of polyethylene pipe has brought no small hidden dangers.
Therefore, the National Bureau of Standards in the new standard GB / T13663-2000 made a lot of amendments, the provisions of the water supply pipe at different levels PE80 and PE100 corresponding to different pressure intensity, and remove the old standard tensile strength properties, and increased the fracture Elongation (greater than 350%), which emphasizes the basic toughness.
Gas with pe pipe is the traditional steel pipe, poly chlorine text ethylene gas replacement products. Gas pipe must withstand a certain pressure, usually to use a large molecular weight, better mechanical properties of PE resin, such as HDPE resin. LDPE resin has low tensile strength, poor pressure resistance, poor rigidity, poor dimensional stability during molding, and difficulty in connection, and is not suitable as a material for water supply pressure pipes. But because of its high health indicators, LDPE, especially LLDPE resin has become a common material of the gas pipe. LDPE, LLDPE resin melt viscosity is small, good mobility, easy processing, and thus its melt index selection range is also wide, usually MI between 0.3-3g / 10min.
HDPE Gas Pipe pipeline application process, HDPE Gas Pipeline can achieve the required long-term life of a key factor is the laying of the quality. The PE pipe has a variety of unique properties to make the laying of the pipeline more secure, fast, and the correct construction design and installation procedures will make these advantages of the pipeline to a greater degree of play.
First, the performance characteristics of HDPE Gas Pipe
1, corrosion resistance
2, lasting strength
3, a higher safety factor
4, excellent coiling
5, good anti-scratch ability
6, good resistance to rapid cracking to pass resistance
7, advanced fuse fittings structure
8, long life, up to 50 years.
Second, HDPE Gas Pipe technical indicators:
1, elongation at break%> 350
2, thermal stability (200 ℃), min <20
3, vertical size retraction rate% (110 ℃) <3
4, hydrostatic strength:
(1) 20 ℃, ring stress 9.0Mpa, toughness destruction time> 100h
(2) 80 ℃, ring stress 4.6Mpa, toughness destruction time> 165h
(3) 80 ℃, ring stress 4.0Mpa, toughness destruction time> 1000h
Third, HDPE Gas Pipe connection steps:
1. Clamp and clean the port
2. Adjust and sharpen the port
3. Port is straight
4. Pressure welding
5. Pressure relief cooling
Fourth, HDPE Gas Pipe connection points
Pipe, pipe fittings hot melt installation of gas buried polyethylene PE pipe, pipe D90 mm below the use of hot melt socket connection, D90mm above the use of hot-melt docking way, the correct installation of the pipeline system to ensure that the user's own safety and engineering quality, we It is recommended to use the multi-angle welding machine and hot-melt docking machine provided by our company. The welding steps are as follows:
1, will need to weld the pipe, pipe fittings fixed on the docking machine, according to the size of the use of fixture pipe, the face with a milling cutter planing, so that the docking face smooth, clean and vertical.
2, adjust the pipe, pipe height, so that the pipe to be welded, pipe fittings face exactly the same, and connected to the heating plate.
3, to be heated to the heating plate to the rated temperature, will need to weld the pipe, pipe fittings to make the end of the heating, to reach the heating time, the pipe, pipe fittings from the heating plate separately, and then the two heating end of the docking, Uniform flange, to be cooled. The technical requirements for hot-melt docking are in line.