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SDR and PN Rate in Water Supply

28.06.2022

What is SDR? 

SDR is a parameter that helps to specify the ratio of outside diameter to wall thickness in pipes. As the SDR increases, the pressure resistance of the pipe decreases along with the decreasing wall thickness. In this case, the SDR index allows us to understand how durable the pipe can be in cases such as temperature fluctuations, surface movement, and internal or external pressure. If the SDR index is low, the PPR pipe should be preferred knowing that the pipe wall thickness will be high and the pipe will be more resistant to pressure.

 

Why is the SDR to PN ratio important?

The usage areas of pipes with different SDR indexes also differ. While pipes with a ratio of SDR 26-41 are used for low-pressure sewer outlets, pipes with a ratio of SDR 21-26 can be used for low-pressure water supply in low buildings. It is also known that pipes with SDR ratios between 11 and 17 are used in irrigation systems. Pipes suitable for gas pipelines and pressure sewer collectors are those with an SDR ratio below 9.

The PN (Nominal Pressure) used while expressing the maximum pressure defines the nominal pipe pressure. When calculating the PN ratio, the lifetime of the pipe is taken at 20°C is 49 years. The bar is used as the unit of measurement and 1 bar corresponds to 14.5 Psi. In addition to all these, there is a PN value in pipe fittings as well as pipes.

 

Polypropylene pipe SDR 6 (PN 20)

It is used in drinking and cold/hot water supply systems as well as in process pipelines carrying gases. Chemical resistance is high. It is able to withstand temperature up to +110 ° С.

 

Fiberglass composite polypropylene pipe SDR 7.4 (PN 20)

It is used in drinking water systems as well as in air conditioning, radiator heating systems and industrial pipe networks. Thanks to its fiberglass layer, higher strength is provided with a low wall thickness. The highest temperature it can withstand is +110 ° С. 

 

As it can be understood, while the PN rate is 20 in both pipe types, the SDR rate differs due to the material used. In other words, although the wall thickness of the fiberglass composite pipe is lower than the wall thickness of the straight pipe, both have the same pressure rate.

 

Composite pipe with aluminum foil SDR 6 (PN 25)

Since the middle layer of aluminum foil pipes have an oxygen barrier, they are widely used in boiler heating systems as well as hot/cold water supply, combined fire extinguishing water supply, technological and pneumatic pipelines. The highest temperature it can withstand is 110°C. There is no need for pre-welding stripping during the installation of pipes with foil in the middle.

 

 

Fiberglass composite pipe SDR 6 (PN 25)

 

Polipropilen pipe SDR 7.4 (PN 16)

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