• Editorial: PP vs PVC for pipes and fittings for sewer, drainage applications Editorial: PP vs PVC for pipes and fittings for sewer, drainage applications Editorial: PP vs PVC for pipes and fittings for sewer, drainage applications Editorial: PP vs PVC for pipes and fittings for sewer, drainage applications Editorial: PP vs PVC for pipes and fittings for sewer, drainage applications Editorial: PP vs PVC for pipes and fittings for sewer, drainage applications Editorial: PP vs PVC for pipes and fittings for sewer, drainage applications
  • Editorial: PP vs PVC for pipes and fittings for sewer, drainage applications Editorial: PP vs PVC for pipes and fittings for sewer, drainage applications Editorial: PP vs PVC for pipes and fittings for sewer, drainage applications Editorial: PP vs PVC for pipes and fittings for sewer, drainage applications Editorial: PP vs PVC for pipes and fittings for sewer, drainage applications Editorial: PP vs PVC for pipes and fittings for sewer, drainage applications

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Editorial: PP vs PVC for pipes and fittings for sewer, drainage applications

Online since 30.01.2017 • Filed under Editorial • From Volume 5 - 2017
Editorial: PP vs PVC for pipes and fittings for sewer, drainage applications

A lack of knowledge in South Africa about the use of polypropylene (PP) for sewer and drainage pipes and fittings for underground gravity sewers and drains may lead to the premature failure of sewer lines if incorrect products are specified.

 

While PVC sewer fittings are all rated 400 kPa (SN 8), both SANS 8773 and SANS 21138 allow lower stiffness ratings for fittings. A lower stiffness rating makes for a thinner wall thickness and therefore a cheaper product. Low-stiffness pipes and fittings are intended for use in shallow drains, whereas SN 8 (400 kPa) pipes and fittings can be used in all drains and deep sewers.


‘The South African market is not well educated to look for, and know, the difference. Hence SN 2 (100 kPa) and SN 4 (200 kPa) PP sewer fittings are sometimes installed in main sewer lines, an application they were not designed or intended for. This may lead to premature failure of sewer lines,’ explains DPI Plastics Technical and Product Manager, Renier Snyman.


‘PP is a new entrant, while having a minimal track record in the sewerage and drainage market, compared to PVC, both locally and abroad,’ Snyman points out. His call for increased awareness about PP versus PVC comes in the light of PP fittings for sewer and drainage applications slowly being introduced into the local market.


DPI Plastics offers a full product range of PVC pipes up to 630mm and fittings are available for these sizes. However, only 110mm PP sewer fittings are available in South Africa.


‘This means that a full system and size range of pipes and fittings are not available locally in PP material,’ Snyman cautions.


About DPI Plastics
DPI Plastics is a leading manufacturer of PVC and HDPE water reticulation and drainage pipe and fitting systems, with two ISO 9001 certified South African factories, one in Johannesburg and the other in Cape Town. In addition, the DPI Group has wholly-owned subsidiary plants in Namibia and Botswana and joint venture manufacturing operations in Mauritius, Tanzania and Angola, producing plastic pipes to the relevant SABS or international specifications.


DPI Plastics

T +27 (0)21 957 5600

F +27 (0)86 505 6484

E mgoodchild@dpiplastics.co.za

W www.dpiplastics.co.za

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