A preliminary analysis of failures in grey cast iron water pipes

Abstract

/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://dx.doi.org/10.1016/S1350-6307(99) [5][6][7][8][9] Engineering Failure Analysis, 7, 1, pp. 43-53, 2000-02-01 A Preliminary analysis of failures in grey cast iron water pipes Makar, J. M. A Preliminary Analysis of Failures in Grey Cast Abstract:Most water utility engineers are familiar with the typical failure modes of grey cast iron pipes such as circumferential breaks and split bells. However, while researchers have examined the forces that are likely responsible for these failures, the failure mechanisms that link those forces with the observed failures have not been thoroughly investigated. Understanding these mechanisms is important for finding ways of detecting damaged pipes and preventing their ultimate failure. This paper presents a failure analysis of five different pipes that show four different failure modes. The analysis suggests that some of these failures occurred in at least two stages, raising the possibility that non-destructive testing could be used to detect pipes that are part way through the failure process. RésuméLa plupart des spécialistes des services publics d'eau connaissent les modes typiques de rupture des conduites en fonte grise, par exemple la rupture annulaire et la cassure de l'embout femelle. Les chercheurs ont étudié les forces qui sont probablement à l'origine de ces ruptures, mais ils n'ont pas examiné en détail la façon dont elles provoquent effectivement les ruptures. Il importe de comprendre ces mécanismes pour trouver des manières de déceler les conduites endommagées et empêcher leur rupture finale. Ce document analyse quatre modes de rupture de cinq conduites. L'analyse porte à croire que certaines de ces ruptures se sont produites en au moins deux étapes, ce qui permet de penser qu'on pourrait recourir aux essais non destructifs pour déceler les conduites qui sont à mi-chemin dans le processus de rupture.2 Introduction:

Development of wastewater pipe performance index and performance prediction model

“…Each pipe material undergoes failure in a different way. Studies have shown that the structural performance and behavior of the buried pipe depend on the type of backfill placed around the pipe, construction sequence, compaction control, surface loads, and the type of pipe material (flexible or rigid) (Makar, 2000;Rajani, 1996;Boot, 1998;Heger, 1985;Davies, 1999;Serpente, 1993).…”

“…This construction method typically consists of placing pipes on bedding material and backfilling the trench. Studies have shown that the structural performance and behavior of the buried pipe is dependent on the type of backfill placed around the pipe, construction sequence, compaction control, surface loads, and the type of pipe material (Makar, 2000;Rajani, 1996;Boot, 1998;Heger, 1985;Davies, 1999;Serpente, 1993). The pipelines used in municipal wastewater systems are made of different types of material depending on suitability of the pipe location and design purposes.…”

Feasibility Study on Joining of Copper Pipes Using Microwave Energy

“…The extensive use of metallic pipes in the industries such as oil, chemical, sugar, automotive, structural industries, paper and process is to transport high pressure liquids and gases [1][2][3][4][5][6][7][8][9][10][11][12][13]. It transmission of liquid is solely depends on the metallic pipes due to its higher strength and durability.…”

Modelación de la intrusión patógena a través de fallos y su implicación en la red de distribución de agua

“…Algunas tuberías que en la actualidad formaban parte de las redes de distribución de agua han sido colocadas desde finales del siglo XIX (Makar, 2000), en la Figura 2.8 se muestra un esquema de la evolución de los materiales utilizados para la conducciones de las redes de distribución.…”

“…Las tuberías de hierro fundido tienen el mayor número de fallos por kilómetro por año en Canadá, con rangos típicos de 0,39roturas/km/año (Makar, 2000). Como se ha mencionado, un factor importante es la edad de las tuberías.…”