Lifetime of Pipes
Plastic Pipes Conference Association # 1992 Eindhoven
Holloway, Naaktgeboren
The relatively high safety factors used in the design of PVC-U pressure pipes reflect concern about the possibility of brittle failure in service. Toughness may be improved by the addition of iinpact modifiers and plasticisers but normally strength is impaired. In this paper we show that pipes exhibiting a high resistance to crack growth may be obtained while still maintaining long term strength (50 yr) over 25 MPa. We also discuss new and alternative test procedures which we feel would be essential if a reduction in safety factor is to be justified.
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Author(s) : Holloway
An extrusion process for manufacturing a molecularly oriented PVC pipe is described. The pipe is stretched in both the hoop and axial d i i i o n s and is therefore described as a BiAxial PVC pipe. It is shown how this process enhances strength and toughness which allows a higher standard of pipe at lower cost. The...
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