Polyethylene pipes are a new type of pipes made from polyethylene raw materials in different commercial grades. Polyethylene is a very simple polymer that is used in the plastic industry. The most important application of polyethylene is in the construction of pipes and fittings for gas and water supply. Primary polyethylene is prepared under the process of ethylene polymerization, in the presence of catalysts, in the refinery of petroleum products. Polyethylene is used in the manufacture of all kinds of plastic appliances, including kitchen utensils, plastic containers, tanks, garbage bags, etc.
Primary polyethylene is available in commercial grades PE63, PE80, and PE100. Each of these raw materials are used to produce polyethylene pipes. Pipes made from each of these materials have their own characteristics.
Polyethylene pipes and fittings in water supply networks Urban and rural, sewage transmission networks, gas transmission system, drainage networks, liquid and industrial wastewater piping systems, pressurized irrigation networks, mobile irrigation systems, covering electric cables, telecommunications and optical fibers, covering some metal pipes, etc. have.
Single-walled polyethylene pipe and double-walled polyethylene pipe (carogate pipe) are two important categories of industrial polyethylene pipes.
Polyethylene pipe is easy to install and operate. It is light to transport and has very low maintenance costs. An electrofusion device is used to connect polyethylene pipes for on-site installation. This connection method is a thermal welding method by electric current. Carrogate double-walled polyethylene pipes, with a corrugated outer surface, is the most widely used type of polyethylene pipe. This type of pipe is resistant to any environmental conditions and has a long life and durability.
In order to prepare these pipes, the desired type of application must be determined and then the pipe with the appropriate diameter and size should be purchased.
What is polyethylene?
Polyethylene is a polymer (bespar) that is formed by the polymerization of monomer units of ethylene (C2H4). This polymer is thermoplastic (softened by heat), in other words, it can be melted and reshaped.
Polyethylenes are resistant, flexible and have a very long life. They are divided into different categories based on their density, for example low density polyethylene (LDPE), linear low density polyethylene (LLDPE), medium density polyethylene (MDPE) and high density polyethylene. Ziyad named (HDPE).
The density of polyethylenes depends on their synthesis method and structure. When they have many side chains and branches, they have an irregular structure that occupies a large volume, so they will certainly have a low density. The more regular, linear and compact the structure, the higher the density of the polymer.
HDPE or high-density polyethylene is a good choice for producing pipes used in pressurized irrigation systems, because of its tensile and impact strength. The world is facing a water shortage crisis and Iran is one of the countries that has a lot of water wastage in the agricultural sector.
Irrigation under pressure is a type of irrigation system that both delivers enough water to the plant and leads to saving water consumption. being able to increase the amount of saving water consumption has been noticed.
Due to the many problems of metal pipes, polymer pipes have opened their place in the plumbing industry for several years.
HDPE is resistant to corrosion. It does not rust or rot. They are flexible rather than rigid, unlike many plastic pipes, they are designed to be comfortable and easily withstand the stress of fluctuating water pressure that is common in water distribution systems.
Depending on their design and implementation, these pipes can be used in pressurized irrigation systems for 50 to 100 years. They are safe and do not pose a health risk.
An important factor of water wastage in irrigation systems is dripping connections, in the case of polyethylene pipes, the connections can be heat welded.
Exactly because of this advantage, almost 95% of distribution pipes US Gas is heat-welded polyethylene pipe. In addition to heat welding, pipes can also be connected to each other using threads of their own size.
In the discussion of setting up irrigation systems under pressure, the flexibility, tensile strength and scratch resistance of polyethylene pipes have made their use very convenient.
The size of polyethylene pipes is very diverse, so there is a range of choices and It brings freedom of action for the user. Also, the friction of the water inside them is relatively low (their Hazen-William coefficient is about 140).