Circumferential failures in grey cast iron pipes

From National Research Council Canada

Download	View accepted manuscript: Circumferential failures in grey cast iron pipes (PDF, 752 KiB)
Author	Search for: Makar, J. M.¹; Search for: Rogge, R.; Search for: McDonald, S. E.¹
Affiliation	National Research Council of Canada. NRC Institute for Research in Construction
Format	Text, Article
Conference	2002 AWWA Infrastructure Conference: 10 March 2002, Chicago, IL
Subject	Cast iron
Abstract	Circumferential cracking (Figure 1) may be responsible for up to 80% of the failures in small diameter (<200 mm / 8 in), grey cast iron water mains (Rajani and McDonald, 1995). However, while failures due to crushing and internal water pressure are well understood and discussed in the relevant manufacturing standards (AWWA, 1939; 1953), circumferential failures have not been investigated in detail. Although Talbot showed that circumferential failures are produced by pipe bending (Talbot, 1926), no modern studies appear to have been performed. In particular, the effect of corrosion pits and graphitisation on circumferential failures is not well understood. While studies (Makar, Desnoyers and McDonald, 2001) have shown that more than 90% of the circumferential failures have been associated with the presence of a corrosion pit at thefailure surface, the effect of a corrosion pit of a particular size and depth on the residual strength of a grey cast iron pipe remains unknown.
Publication date	2002-04-01
Language	English
Peer reviewed	Yes
NRC number	NRCC 45013 NRCC 14159
NPARC number	20378725
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Record identifier	06ebed11-e08a-42f9-9411-312bd045cb25
Record created	2012-07-24
Record modified	2020-03-30

Date modified:: 2024-12-21