HDPE gas pipe details description:
HDPE gas pipe is a gas transmission pipe made of high density polyethylene (HDPE). The raw material used for HDPE gas pipe is imported bipeak high density polyethylene pressure pipe special material, gas pipe special material is much slower than the general HDPE, not only has excellent long-term compressive strength, but also has excellent resistance to slow stress cracking growth and rapid stress propagation performance, but also has excellent anti-overhang performance. The main grades of HDPE gas pipe are PE100 and PE80. HDPE gas pipe has many excellent characteristics, corrosion resistance, low temperature resistance, good toughness, safe and reliable joint connection, and has been widely used in the field of gas transmission and distribution. The materials used for gas pipes and water supply pipes are mainly PE80 and PE100.
HDPE gas pipe material characteristics and advantages:
Strong corrosion resistance: HDPE is an inert material, in addition to a few strong oxidants, can resist the erosion of a variety of chemical media, corrosive components in gas (such as hydrogen sulfide, acid gas) and soil acid, alkali, salt and other chemicals have a strong tolerance, will not occur decay, rust or electrochemical corrosion phenomenon, no additional anti-corrosion coating, reducing maintenance costs. Good stress cracking resistance: HDPE has low notch sensitivity, high shear strength and excellent scratch resistance, outstanding environmental stress cracking resistance, greatly reducing the risk of malignant accidents caused by pipeline cracking. Slow crack growth and fast crack growth resistance: The selected raw materials have excellent slow crack growth (SCG) and fast crack growth (RCP) resistance, which can effectively ensure that the gas pipeline will not cause catastrophic cracking accidents due to accidental factors during use. Good flexibility: the break elongation of HDPE gas pipe is generally more than 500%, the pipeline is flexible, easy to bend, can adapt to complex terrain and geological settlement, can bypass obstacles by changing the direction of the pipeline, in many cases can reduce the amount of pipe fittings and reduce installation costs. Strong impact resistance: it can withstand the mechanical stress during transportation and installation, as well as the external impact such as earthquake and construction vibration, and can also resist the impact without breaking in cold weather, reducing the risk of pipeline rupture due to external force. Aging resistance, long service life: polyethylene pipes containing 2%-2.5% uniform distribution of carbon black can be stored or used in the outdoor open air for 50 years, will not be damaged by ultraviolet radiation, and can be safely used for more than 50 years under rated temperature and pressure conditions. Good health performance: no heavy metal salt stabilizer is added during processing, the material is non-toxic, no scaling layer, no bacteria breeding, which solves the problem of secondary pollution of urban drinking water well, and will not pollute the gas transported.
HDPE gas pipe construction method:
Hot melt connection: The hot melt machine is used to heat the connection part of the pipe and pipe fittings to a molten state, and then the two are quickly bonded, cooled and solidified under a certain pressure to form a solid connection. Suitable for the same material, nominal outer diameter ≥63mm pipe and pipe, pipe and pipe fittings connection. Electric fusion connection: the electric fusion pipe is set on the pipe, and the resistance wire in the electric fusion pipe is electrified through the electric fusion welding machine, so that the resistance wire heats up and the contact surface of the pipe and the pipe is melted, and the body is formed after cooling. Suitable for various specifications of HDPE pipe connection, especially suitable for nominal outer diameter < 63mm pipe or cannot use hot melt connection occasions. Flange connection: The HDPE pipe and flange are connected together by hot melt or electric melt, and then the two flanges are connected by bolts, and the sealing gasket is installed in the middle to realize the connection and sealing of the pipeline. The flange connection is suitable for the connection of HDPE pipes with valves, flowmeters and other equipment, as well as the parts that need to be disassembled frequently, which is easy to maintain and overhaul.
