Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Old unplasticised poly(vinyl chloride) water pressure pipes. Investigation into design and durability
The performance of old poly(vinyl chloride) (PVC) water pipes has been investigated. Pipes were dug up and evaluated to characterise the pipe material and to determine the functional properties. Most of the pipes continue to fulfill the current criteria for poly(vinyl chloride) water pressure pipes after being in service for periods up to 35 years. Lifetime expectancies of these pipes will easily be exceeded. This indicated that new pipes produced according to current CEN-requirements will continue to perform for considerably more than the 50 years lifetime specified in standards due to improvements in PVC materials and pipe extrusion technology. Pipes being in service for 12 to 37 years showed strainability, ductility, and resistance to internal pressure largely unaffected by aging, and remain at a similar standard to new pipes. Some of the older pipes showed, correlating with the change in PVC processing in the early 1970s, gelation levels which are significantly less than those currently considered necessary for a good long life perfomance. The most significant changes in PVC-processing are 1965, change from emulsion to suspenssion PVC; 1971, use of powder rather than granular PVC; change of molecular weight (K value); development of one pack stabilisation system; increased output by improved design of extruders; improved gelation during processing. (PVC 96, Brighton, UK, 23-25 April 1996)
Old unplasticised poly(vinyl chloride) water pressure pipes. Investigation into design and durability
The performance of old poly(vinyl chloride) (PVC) water pipes has been investigated. Pipes were dug up and evaluated to characterise the pipe material and to determine the functional properties. Most of the pipes continue to fulfill the current criteria for poly(vinyl chloride) water pressure pipes after being in service for periods up to 35 years. Lifetime expectancies of these pipes will easily be exceeded. This indicated that new pipes produced according to current CEN-requirements will continue to perform for considerably more than the 50 years lifetime specified in standards due to improvements in PVC materials and pipe extrusion technology. Pipes being in service for 12 to 37 years showed strainability, ductility, and resistance to internal pressure largely unaffected by aging, and remain at a similar standard to new pipes. Some of the older pipes showed, correlating with the change in PVC processing in the early 1970s, gelation levels which are significantly less than those currently considered necessary for a good long life perfomance. The most significant changes in PVC-processing are 1965, change from emulsion to suspenssion PVC; 1971, use of powder rather than granular PVC; change of molecular weight (K value); development of one pack stabilisation system; increased output by improved design of extruders; improved gelation during processing. (PVC 96, Brighton, UK, 23-25 April 1996)
Old unplasticised poly(vinyl chloride) water pressure pipes. Investigation into design and durability
Gebrauchte weichmacherfreie Polyvinylchlorid-Druckwasserrohre. Betriebsdauertauglichkeit
Alferink, F. (Autor:in) / Janson, L.E. (Autor:in) / Holloway, L. (Autor:in)
1997
4 Seiten, 6 Bilder, 3 Tabellen, 6 Quellen
Aufsatz (Zeitschrift)
Englisch
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