Polythene, or PE, pipe is a flexible plastic pipe. Polythene pipe is more resistant to corrosion than steel pipe. It is commonly used to carry water and wastewater, such as in irrigation and sprinkler systems. PE pipe can be pressurised or non-pressurised. Polythene pipe can be made to follow bends and turns without additional joints. It can also be used as a protective covering for other types of pipe. However, because PE pipe is flexible and compressible, it cannot withstand heavy compression or loads. This limits polythene pipe diameter to a maximum of 63 inches.
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Polythene pipe can be made in diameters ranging from 1/2 inch to 63 inches in diameter. It is most commonly found in 3/4-inch, 1-inch and 1 1/4-inch sizes. Because polythene pipe is manufactured in a continuous extrusion process, it is also available in almost any length. Polythene pipe can be purchased in rolls hundreds of feet long.
Water Pipe Standards
The American Water Works Association has issued standards for polythene pipes used to carry water and wastewater in homes and businesses. AWWA standard C-901-08 applies when the pipe has a diameter of ½ inches to 3 inches. AWWA standard C-906-07 applies to large-diameter polythene pipe with diameters from 4 inches to 63 inches. These standards define how polythene water and wastewater pipes must be labelled, the pressure ratings they must endure, and test methods to ensure that they do not corrode in the presence of water or leech chemicals into the water. Both of these AWWA standards have also been adopted by the American National Standards Institute (ANSI).
Polythene pipe can be used to encase iron pipe to protect it from corrosion. These polythene-encased pipes range from 3 inches to 63 inches in diameter. ANSI standard C105 applies to this type of PE pipe. The International Standards Organization (ISO) has developed standard ISO 8180 for PE-encased pipe. These standards define the corrosion resistance the protective polythene pipe must demonstrate, testing methods for determining pipe quality and installation methods.
The Standard Dimensional Ratio or SDR is a measure of pipe wall thickness. In the "Facility Piping Systems Handbook," author Michael Frankel says, "the SDR is found by dividing the average outside diameter of the pipe by the wall thickness ... It is possible for a pipe of have different SDRs depending on whether the I.D. (internal diameter) or O.D. (outer diameter) is the controlling factor." The American Society for Testing and Materials also has standards regarding SDR of PE pipes. SDR is used to determine pressure ratings and bursting pressure for polythene pipe.
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- "Facility Piping Systems Handbook"; Michael Frankel; 2009
- "PE Pipe: Design and Installation"; American Water Works Association; 2006
- "Ductile-iron Pipe and Fittings"; American Water Works Association; 2002
- "PE 100 Pipe Systems"; Heiner Brömstrup; 2007
- "Practical Guide to Polyethylene"; Cornelia Vasile, Mihaela Pascu; 2008
- "Scotts Sprinklers & Watering Systems"; Michael D. McKinley; 2005