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Evaluation of surge and fatigue resistance of poly(vinyl chloride) and polyethylene pipeline materials for use in the UK water industry
The current advice for design against fatigue in water and sewerage pipelines contained in the Pipe Materials Selection Manual was adopted from BS CP312, which was introduced owing to concern about large numbers of failures of unplasticised poly(vinyl chloride) (uPVC) pipelines in the 1960s and 1970s. Although originally intended for uPVC alone, the derating criteria were also adopted in the Pipe Materials Selection Manual for polyethylene (PE) materials. There have been no reported fatigue failures in PE pipelines and failure rates for uPVC pipes have declined markedly in the last few years, largely because of increased static fracture toughness. It is now believed that this design advice is excessively conservative. A research programme has been undertaken to determine the fatigue resistance of the range of PE and PVC materials currently used by the water industry, taking into account the many variables encountered. Modern PE80 and PE100 materials have been shown to be highly resistant to premature failure by cyclic loading and providing they pass water industry toughness criteria do not require derating. However, those PE materials that have not been demonstrated to satisfy the water industry specifications and all types of PVC pipes should be derated by different factors developed from extrapolation of data for each material. The research has led to the development of new fatigue design factors and separate surge pressure ratings for the various PE and PVC pipeline materials, forming the basis of a new Information and Guidance note (WIS 4-32-07) for the water industry.
Evaluation of surge and fatigue resistance of poly(vinyl chloride) and polyethylene pipeline materials for use in the UK water industry
The current advice for design against fatigue in water and sewerage pipelines contained in the Pipe Materials Selection Manual was adopted from BS CP312, which was introduced owing to concern about large numbers of failures of unplasticised poly(vinyl chloride) (uPVC) pipelines in the 1960s and 1970s. Although originally intended for uPVC alone, the derating criteria were also adopted in the Pipe Materials Selection Manual for polyethylene (PE) materials. There have been no reported fatigue failures in PE pipelines and failure rates for uPVC pipes have declined markedly in the last few years, largely because of increased static fracture toughness. It is now believed that this design advice is excessively conservative. A research programme has been undertaken to determine the fatigue resistance of the range of PE and PVC materials currently used by the water industry, taking into account the many variables encountered. Modern PE80 and PE100 materials have been shown to be highly resistant to premature failure by cyclic loading and providing they pass water industry toughness criteria do not require derating. However, those PE materials that have not been demonstrated to satisfy the water industry specifications and all types of PVC pipes should be derated by different factors developed from extrapolation of data for each material. The research has led to the development of new fatigue design factors and separate surge pressure ratings for the various PE and PVC pipeline materials, forming the basis of a new Information and Guidance note (WIS 4-32-07) for the water industry.
Evaluation of surge and fatigue resistance of poly(vinyl chloride) and polyethylene pipeline materials for use in the UK water industry
Bewertung von Druckwellen und Ermüdungswiderstand von Polyvinylchlorid- und Polyethylen-Rohrleitungsmaterialien zur Anwendung in der britischen Wasserindustrie
Marshall, G.P. (author) / Brogden, S. (author) / Shephert, M.A. (author)
1998
6 Seiten, 8 Bilder, 2 Tabellen, 20 Quellen
Conference paper
English
Resistance of polyethylene water pipeline systems to surge pressure
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