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Quality control analysis of downtime and time to repair for water supply pipes

机译：供水管道的停机时间和维修时间的质量控制分析

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Purpose - The purpose of this paper is to investigate performance times from a quality engineering perspective for response and repair of pipes at a public utility. The objective is to scientifically determine the pipe that offers the most desirable downtime (DT) and time to repair (TTR). Design/methodology/approach - Four types of water supply pipes - concrete cylinder (CC), cast iron (CI), ductile iron (DI), and polyvinyl chloride (PVC) - in prevalent use at the City and County of Honolulu Board of Water Supply were analyzed to determine the pipe type that is most consistently repaired to desired performance specifications. Data for mean downtime (MDT) and mean time to repair (MTTR) were used to evaluate the stability and capability of the repair processes for each pipe type. The analysis was completed through the use of control charts, operating characteristic (OC) curves, and process capability indices. Findings - The results of the analysis indicated that CI pipes were the worst material in terms of DT and TTR. The control charts for MDT for all pipe types, and the MTTR for CI and CC pipes, were found to be out of statistical control, but the control charts for the MTTR of DI and PVC pipes were discovered to be in control. According to the OC curves, in which the hypothesis stated that the average MDT or MTTR was between the specification limits, there was a high tendency in all pipe types to accept the hypothesis when it was true. However, the probability of type I errors was high from operational standards at the USL level. Process capability analyses found that only CC pipes were able to meet performance design specifications; however, repair times are extremely large for CC pipes. Overall, it is recommended that CI pipes be replaced when the opportunity arises. Practical implications - This investigation serves to address a major query in asset management at the public utility, that of which pipes should be selected during design and procurement from a maintenance perspective. In addition, the study helps to understand the trend of DT and TTR for the various pipes. Social implications - Quality water supply is of paramount social importance in modern cities. Originality/value - A quality engineering approach to asset management for pipe systems at public utilities that serves to add a new dimension to asset performance analysis is adopted.
机译：目的-本文的目的是从质量工程的角度研究性能时间，以对公共事业的管道进行响应和维修。目的是科学地确定提供最理想的停机时间（DT）和维修时间（TTR）的管道。设计/方法/方法-四种供水管道-混凝土筒（CC），铸铁（CI），球墨铸铁（DI）和聚氯乙烯（PVC）-檀香山市和县市普遍使用对供水进行了分析，以确定最一致地维修到所需性能规格的管道类型。平均停机时间（MDT）和平均修复时间（MTTR）数据用于评估每种管道类型的修复过程的稳定性和能力。通过使用控制图，操作特性（OC）曲线和过程能力指数来完成分析。调查结果-分析结果表明，就DT和TTR而言，CI管道是最差的材料。发现所有类型的管道的MDT的控制图以及CI和CC管道的MTTR不受统计控制，但发现DI和PVC管道的MTTR的控制图处于受控状态。根据OC曲线（该假设表明假设的平均MDT或MTTR在规格限制之间），在所有管道类型中都存在接受该假设的可能性很高。但是，根据USL级别的操作标准，I型错误的可能性很高。对过程能力的分析发现，只有CC管道能够满足性能设计规范。但是，CC管道的维修时间非常长。总体而言，建议在机会出现时更换CI管道。实际意义-该调查旨在解决公用事业公司资产管理中的一个主要问题，即从维护的角度在设计和采购过程中应选择哪种管道。此外，该研究有助于了解各种管道的DT和TTR趋势。社会意义-在现代城市中，优质的供水至关重要。原创性/价值-采用了一种公用工程管道系统资产管理的质量工程方法，旨在为资产绩效分析增加新的维度。

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