![]() ![]() It is intended for use in more severe conditions and is especially suitable for trenchless methods. PE100 RC is a resin that has an increased stress crack resistance while maintaining the same MRS and rapid crack propagation resistance as conventional PE100. In addition to conventional HDPE PE100 pipe there are several variants that have been developed for specific applications. Surge & Fatigue Loadingĭesign process for surge & fatigue loading of HDPE PE100 pipe HDPE PE100 Pipe Types Size transitions and directional changes experience both abrasive erosion and impact abrasion and should be designed with this in mind. The straight sections most commonly experience abrasive erosion. There are distinct types of wear experienced in a typical piping system. Conversely when the mineral is harder than the pipe, there is a very sudden and steep rise in the abrasive wear rate. The wear rates of various piping materials are often similar, so long as their hardness is greater than the slurry so selecting a pipe material considerably harder than the conveyed material offers no wear advantage and typically costs more. To resist abrasion, the piping system must be harder than the material being conveyed. The amount of abrasive wear decreases as the strength/hardness of the piping material increases. There is an approximate relationship between hardness and the ultimate strength of the material. Harder materials better resist the gouging or ploughing action of abrasive particle flow. At low angles of impingement ( abrasive erosion), the reverse is the case. Brittle materials are less wear resistant than ductile materials in an impact erosion condition. With brittle materials, the impingement causes particles of material to be fractured off as wear debris. In ductile materials, the repeated impinging particles plastically deform the surface to generate wear debris. At close to 90 degree impingement angles ( impact abrasion), the erosive wear rate is highest in brittle materials and lowest in ductile materials. The magnitude of wear depends on the angle of impingement and the type of material being eroded. PE100 has the best abrasion resistance of the commonly used pressure pipe materials. This is a consideration in wastewater rising/force mains in which there are solids transported with the water and pump operation sequences can result in solids rubbing along the pipe invert. ![]() ISO13761:1996 defines reduction factors to be applied to MOP at higher temperatures. The correlation with the ISO factors is clear.ĭesign. In the USA the Plastics Pipe Institute Handbook of Polyethylene Pipe Table A.2 includes the following reduction factors. Otherwise there are standard reduction factors that can be applied in design. Some Codes and Standards define the reduction factors that must be applied AWWA C901 and C906 for example. At higher temperatures it may be necessary to apply reduction factors to MRS, and consequently MOP. These properties can be significantly affected by temperature, so at higher temperature the properties, including MRS, decrease. The properties of HDPE PE100 pipe are determined at standard temperatures of 20☌ or 23☌. Thermal Expansion Co-efficient: 1.3 x 10-4 ☌-1.Modulus of Elasticity (50 years): 200 MPa.Allowable Compressive Strength: 7.93 MPa.Hydrostatic Design Basis (HDB) Pressure: 1600 psi (11 MPa).Minimum Required Strength (MRS): 10.0 MPa (1450 psi).For the trenchless applications butt fusion is most widely used because this results in a smooth exterior profile with no protrusions that might cause difficulties in pulling the pipe into the ground or host pipe. It can be jointed using butt fusion or electrofusion to create a leak-free pressure network for gas or water. HDPE PE100 pipe is easy to install, light, flexible, corrosion-free and has a service life of up to 100 years. Stress crack resistance (sometimes referred to as slow crack growth resistance).Minimum Required Strength (MRS) – this provides long-term strength and creep resistance.It has an optimum balance of three key properties: PE100 is the third generation of pipe grade PE. ![]()
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