Design Criteria for HDPE Pipes

High-density polyethylene (HDPE) pipe is a flexible plastic pipe used for low-temperature fluid and gas transport. Potable water, hazardous waste, different gases, sewage, firewater, storm water, etc. are just a few of the things that HDPE pipes are now used for extensively. HDPE pipe materials are useful for high-pressure pipelines because of their strong molecular bonds. The history of polyethylene pipes in the gas, oilfield, mines, water, and other industries is one of long-standing excellence.

Connecting HDPE Pipes

HDPE pipes and fittings are connected to one another either mechanically or through welding. To link HDPE pipes together, two different welding techniques are employed. Those are

Butt Welding, without the use of additional connection fittings, butt welding uses heat and pressure to uniformly combine HDPE pipes and fittings into prefabricated sections.

Electrofusionis a quick and easy way to permanently connect individual pipes, HDPE fittings, or prefabricated pieces in confined spaces. On-site joints can be repaired with this technique.

HDPE Pipes: Pressure Consideration

The HDPE pipes' hydrostatic pressure capability is influenced by a variety of factors. They are.

  • The ratio of the wall thickness to the outside diameter of an HDPE pipe is known as the standard dimension ratio.
  • The HDPE material's hydrostatic design stress is utilized to manufacture HDPE pipes.
  • The highest and lowest acceptable working temperatures.
  • The length and fluctuation of the internal hydrostatic pressure's stress during hydrostatic testing.
  • The HDPE pipe's ability to withstand service chemicals
  • Design Guidelines for HDPE Pipe Aboveground

    The following factors can affect how aboveground HDPE piping systems behave and, consequently, how they are designed.

    Temperature: HDPE pipes are typically only used in pressure systems between -400C and 500C. Higher temperatures may be employed for non-pressure services. To learn more about the manufacturer's product, consult them. Keep in mind that HDPE pipes have a linear thermal expansion coefficient that is roughly ten times greater than that of metal pipes. The potential for thermal expansion as a result of temperature changes is therefore very considerable and must be taken into account during design. According to the rule of thumb, HDPE pipes will swell or shrink by 0.2mm per meter very °C in temperature increase or reduction.

    Mechanical impact: When installing HDPE pipes in an area with heavy traffic or mechanical abuse, additional protection must be provided.

    Chemical exposure and Internal Pressure

    UV rays:Black HDPE pipes with a minimum of 2% carbon black are chosen as protection against the effects of ultraviolet rays.


    HDPE Pipe and fittings are best choice for the piping system. Polyfab provides the best HDPE pipes and fitting in Ethiopia, Kenya and Ghana. Contact our team to know more about HDPE pipes and fittings.

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