Pipe Specifications

The HDPE pipes manufactured by Rendifield are manufactured to, and carry the SABS mark for, SANS ISO 4427. These pipes are manufactured from three different designated materials viz: PE 63, PE 80 and PE 100. It can be seen that SANS 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

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

PE 100 HDPE Pipe SANS/ISO 4427, SABS, SAPPMA dimensions

• The standard dimensional ratio SDR corresponds to the quotient between the outside diameter and the wall thickness of the pipe. It is non-dimensional.
• The nominal pressure PN corresponds to the maximum permissible operating pressure of the pipe at 20°C, in bar.
• e = Minimum Wall Thickness.
• Pipe series related to Pipe Stiffness.

This table is based on the standards ISO 4427 and ISO 4065.

The weights are calculated on the base of average diameter and thickness values, according to tolerances specified in the standards ISO 11922-1.
• Figures in black indicate SABS mark bearing pipes.
• Figures in red indicate pipes classified under ISO 4065 (non-SABS mark bearing pipes).

PE 100, PE 80 & PE 63 Pipe dimensions

• The standard dimensional ratio SDR corresponds to the quotient between the outside diameter and the wall thickness of the pipe. It is non-dimensional.
• The nominal pressure PN corresponds to the maximum permissible operating pressure of the pipe at 20°C, in bar.
• e = Minimum Wall Thickness.
• Pipe series related to Pipe Stiffness.