Post-perforation external corrosion of cast iron pressurised water mains

Title: Post-perforation external corrosion of cast iron pressurised water mains
Creator: Melchers, R. E.
Relation: Corrosion Engineering Science and Technology Vol. 52, Issue 7, p. 541-546
Publisher Link: http://dx.doi.org/10.1080/1478422X.2017.1350326
Publisher: Taylor & Francis
Resource Type: journal article
Date: 2017
Description: The corroded external surfaces of older cast iron water mains buried in soils for many decades usually show a rough undulating topography. Sometimes, there also are areas of relatively smooth topography similar to uniform corrosion but over undulating surfaces. Investigations show this pattern is associated with localised pipe-wall perforation and sometimes pipe fracture. It is proposed that corrosion pitting from the outside surface of the pipe perforates the pipe-wall, allowing fresh oxygenated drinking water from inside the pipe to effuse through the orifice. This then causes a high rate of localised general corrosion under the graphitised layer. The resulting thinning of the pipe-wall may then lead to pipe fracture under high water pressure.
Subject: cast iron; corrosion; water pipes; perforation
Identifier: http://hdl.handle.net/1959.13/1349590
Identifier: uon:30419
Identifier: ISSN:1478-422X
Language: eng
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