- 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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