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HDPE PIPE MATERIAL ADVANCES
Considerable strides have been made in improving the quality of HDPE material and its long term ability to withstand pressure. The current ISO specification, ISO 4427, covers 3 different material grades (PE 63, PE 80 and PE 100). These three material grades have different properties which enable them to be classified with minimum required strengths (MRS) of 6.3 MPa, 8,0 MPa and 10.0 MPa respectively. Applying a design coefficient of 1.25 (safety factor) to the MRS gives the design stress used by SANS 4427 for these materials (5.0 MPa, 6.3 MPa and 8.0 MPa respectively) with the result that the wall thickness for a particular size and class becomes progressively less as the change is made to a material with a higher MRS.
Features and Benefits
√ Good impact strength: Little handling and installation damage.
Excellent corrosion resistance: Long and efficient service life.
Good chemical resistance: Wide variety of applications.
Low mass: Easy handling.
Flexibility: Easy installation.
Long lengths available: Fewer joints.
Good abrasion resistance: Can be used to pump slurries.
Good UV resistance: Can be used in exposed locations.
Low friction losses: Lower pumping costs.
Several jointing methods: Wide variety of applications.
Extensive range of fittings: Wide variety of installations.
Applications
Highmountain(Haiwei) Pipe Systems have for several years been confidently supplying their range of HDPE pipes, fittings and saddles for successful use in a variety of applications in the Civil, Agricultural, Municipal, Mining and Industrial sectors. Because of the good chemical resistance and abrasion resistance properties they are also extensively used in chemical, waste and slurry applications.
Quality Assurance
Highmountain Pipe Systems (and Haiwei Pipe Systems ) has been an ISO mark holder for over 20 years. Products are manufactured to the relevant ISO specifications at plants in Jiangyin Jiangsu,China. Both manufacturing facilities conform to the ISO 9001 Quality Management system. Fully audited Quality Control laboratories are operational at both facilities, where scheduled and random testing of products is carried out.
PIPE SPECIFICATIONS
The HDPE pipes manufactured by Highmountain(Haiwei Pipe) Systems are manufactured to, and carry the mark for, ISO 4427. These pipes are manufactured from three different designated materials viz: PE 63, PE 80 and PE 100. See tables on page 7. In these tables it can be seen that ISO 4427 have grouped together the different pressure classes, produced from different material designations, under a common heading known as the Standard Diameter (Dimension) Ratio or SDR. The minimum wall thicknesses specified are not exactly that which would be derived from a calculation using Barlow’s formula or the SDR but are the rounded up values of the highest minimum wall thickness calculated for any size and class in the SDR group (see Design Stress and Safety Factor on page 9).
Coil Dimensions
Hydrostatic Design Stress (HDS)
Notes on Pipe Dimension tables: • HDS (Hydrostatic Design Stress), in (MPA), is obtained by applying a design factor of not less than 1.26 to the minimum required strength value of the pipe. • Out of roundness (Ovality) Grade N. • PE 63 material is NLA. Therefore PE 80 material is used to manufacture PE 63 specification, increasing the design safety factor from 1,26 to 1,6. • SDR = Standard Dimension Ratio = Outside diameter / wall thickness
PIPE DIMENSIONS TABLES (ISO 4427)
PHYSICAL PROPERTIES
High Density Polyethylene (HDPE) is a thermoplastic material which is supplied by the manufacturer in a ‘ready to use’ pelletised form. The grades suitable for pipe manufacture are PE 63, PE 80 and PE 100. The pipe manufacturer converts this material into pressure pipe
Table of Physical Properties
The properties given below are for HDPE grades used to manufacture pipe. It should be noted that many of these properties are relative to temperature and the duration of stress application.
Comparison with Other Plastic Materials