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Identifying the hazard characteristics of pipes in water distribution systems by using the proportional hazards model: 2. Applications

  • Water Engineering
  • Published:
KSCE Journal of Civil Engineering Aims and scope

Abstract

The proportional hazards model is applied to a case study water main break database to identify the hazard characteristics in relation to the factors causing breaks for various categories of the pipes. The analysis showed that a distinction could be made as of when a group of the pipes reach constant hazard stage by using the methodology of building the proportional hazards models for multiple pipe breaks introduced inTheory part of this issue. Effects of the environmental factors that affect the pipe failures are also analyzed and physical interpretations of the phenomena are illustrated. The methodology can provide guidelines on determining a category of pipes that needs more preventive rehabilitation or replacements.

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Abbreviations

CI-0 :

Cast Iron pipes with 0 previous number of breaks

CI-1 :

Cast Iron pipes with 1 previous number of breaks

CI-2 :

Cast Iron pipes with 2 previous numbers of breaks

DI-0 :

Ductile Iron pipes with 0 previous number of breaks

DI-1 :

Ductile Iron pipes with 1 previous number of breaks

DI-2 :

Ductile Iron pipes with 2 previous number of breaks

h(t) :

Hazard function of the time to failure of pipe

H 0 (t) :

Cumulative baseline hazard function of the time to failure of pipe

h 0 (t) :

Baseline hazard function of the time to failure of pipe

LD :

Land development with more than 1/3 of Urban area, 1=Yes, 0=No

MBD :

Moist Bulk Density of soil

PFA :

Potential Frost Action of soil

PFAH :

Potential Frost Action of a soil association evaluated as high, 1=Yes, 0=No

ROC :

Risk of Corrosion of soil

ROCH :

Risk of Corrosion of a soil association evaluated as high, 1=Yes, 0=No

SSP :

Shrink-Swell Potential of soil

SSPM :

Shrink Swell Potential of a soil association evaluated as medium, 1=Yes, 0=No

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Authors and Affiliations

  1. Department of Civil Engineering, Pusan National University, Korea

    Suwan Park (Member, Full Time Lecturer)

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  1. Suwan Park
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Correspondence to Suwan Park.

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Park, S. Identifying the hazard characteristics of pipes in water distribution systems by using the proportional hazards model: 2. Applications. KSCE J Civ Eng 8, 669–677 (2004). https://doi.org/10.1007/BF02823558

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  • DOI: https://doi.org/10.1007/BF02823558

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