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HDPE pipe is a flexible plastic pipe made of thermoplastic high-density polyethylene widely used for low-temperature fluid and gas transfer. In recent times, HDPE pipes got their extensive uses for carrying potable water, hazardous wastes, various gases, slurry, firewater, stormwater, etc. The strong molecular bond of HDPE pipe materials helps it to use for high-pressure pipelines. Polyethylene pipes have a long and distinguished service history for the gas, oil, mining, water, and other industries. Due to its low weight and high corrosion resistance, the HDPE pipe industry is growing tremendously. In the year 1953, Karl Ziegler and Erhard Holzkamp discovered high-density polyethene (HDPE). HDPE pipes can work satisfactorily in a wide temperature range of -2200 F to +1800 F. However, the use of HDPE Pipes is not suggested when the fluid temperature exceeds 1220 F (500 C).

The HDPE pipe fittings can be performed in several ways as described below. It should be noted that based on the type of the fittings included in the specifications of the design one should do pipe fittings in different parts of the plan. HDPE pipes are usually produced with two simple ends. Therefore, in order to establish a connection between the two branches, it is necessary to connect one simple end of a branch to the other simple end with a connection to each other. The various methods used to connect HDPE pipes, accessories and valves, are as follows:

1- Thermal Butt (HDPE Butt Fusion Fittings)

2- Thermal bushing

3- Electro Fusion(HDPE Electrofusion Fittings)

UPVC Pipe Fittings stand for Unplasticized polyvinyl chloride. Due to its strong resistance to chemicals, and elements of nature, UPVC makes an ideal choice for residential and commercial plumbing constructions. It also includes UPVC Gasketed Fittings and UPVC Solvent Weld Fittings.

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