Circumferential failures in grey cast iron pipes

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Conference2002 AWWA Infrastructure Conference: 10 March 2002, Chicago, IL
Pages118; # of pages: 18
SubjectCast iron
AbstractCircumferential 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
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number45013
NPARC number20378725
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Record identifier06ebed11-e08a-42f9-9411-312bd045cb25
Record created2012-07-24
Record modified2016-05-09
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