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The pressure classification of pipes based on the international standard ISO 12162 is shown in the table below. This classification is based on the minimum strength of 50 years of the pipe.

Although there was a big change in the market with the introduction of PE100 type polyethylenes, in order to further reduce production costs and compete with other materials such as steel in higher pressure categories, PE112 polymers with a minimum strength of 11.2MPa have been introduced to the market. Although due to some problems in some of its features, they have not been used much, but now, by correcting these problems, they are trying to bring PE125 to the market with a minimum strength of 12.5MPa, which itself will cause a huge change in the polyethylene industry. It should be noted that a suitable polymer, in addition to the issue of minimum strength, should also have suitable processing characteristics (with existing production equipment). while providing other required physical and mechanical characteristics. Of course, by increasing the minimum strength of the material, the thickness of the wall can be reduced in various applications.

This issue, in addition to saving material consumption, increases the cross-sectional area of ​​the pipe in the outer diameter, which results in an increase in the pipe’s transmission capacity. If we assume the transfer capacity to be constant, the transfer speed can be reduced and as a result, smaller pumps can be used for transfer. This will reduce the costs, while repairing the pipe and using lining pipes inside the previous pipe, the loss of transmission capacity will not be large. For example, in pipes under water supply pressure of 10 bar, by changing the material from PE80 to PE100, the thickness is reduced and in addition to saving 33% of the material, the cross-sectional area of ​​the pipe for fluid transmission increases by 16%.

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