Process modeling for decomposition unit of a UFP for reliability indices subject to fail-back mode and degradation

IF 1.8 Q3 ENGINEERING, INDUSTRIAL Journal of Quality in Maintenance Engineering Pub Date : 2023-01-31 DOI:10.1108/jqme-01-2022-0008
Amit Kumar, M. Ram
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Abstract

PurposeEnsuring safe operation of a urea fertilizer plant (UFP) is a vital aspect for its functioning and production. Clearly the safe operation of such systems can only be archived with proper and effective maintenance scheduling and through controlling its failures as well as repairs of the components. Also for this, the concern plant management must have the information regarding the failures that affects the system's performance most/least. The objective of this study is to analyze mathematically the factors that are responsible for the failure/degradation of the decomposition unit of UFP.Design/methodology/approachThe considered system has been modeled by the aid of Markov's birth–death process with two types of failures for its components: variable (which are very similar in practical situations) and constant. The mathematical model is solved by the help of Laplace transform and supplementary variable technique.FindingsIn the present paper, the availability, reliability and mean time to failure (MTTF) are computed for the decomposition unit of the UFP. The critical components that affect the reliability and MTTF of the decomposition unit are identified through sensitivity analysis.Originality/valueIn this paper, a mathematical model based on the working of the decomposition unit of a UFP has been developed by considering two types of failure, namely, variable failures rates and constant failure rates (which has not been done in the literature for the decomposition unit). Conclusions in this paper are good references for the improvement of the same.
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UFP分解单元在故障恢复模式和退化条件下可靠性指标的过程建模
目的确保尿素化肥厂(UFP)的安全运行是其运行和生产的一个重要方面。显然,只有通过适当有效的维护计划以及控制其故障和部件维修,才能确保此类系统的安全运行。此外,相关工厂管理层必须掌握对系统性能影响最大/最小的故障信息。本研究的目的是从数学上分析导致UFP分解单元故障/退化的因素。设计/方法/方法所考虑的系统是通过马尔可夫的出生-死亡过程建模的,其组件有两种类型的故障:变量(在实际情况下非常相似)和常量。利用拉普拉斯变换和辅助变量技术对数学模型进行求解。本文计算了UFP分解单元的可用性、可靠性和平均失效时间。通过灵敏度分析,确定了影响分解单元可靠性和MTTF的关键部件。独创性/价值在本文中,通过考虑两种类型的故障,即可变故障率和恒定故障率(在分解单元的文献中没有这样做),开发了一个基于UFP分解单元工作的数学模型。本文的研究结论对该方法的改进有很好的参考价值。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Quality in Maintenance Engineering
Journal of Quality in Maintenance Engineering Engineering-Safety, Risk, Reliability and Quality
CiteScore
4.00
自引率
13.30%
发文量
24
期刊介绍: This exciting journal looks at maintenance engineering from a positive standpoint, and clarifies its recently elevatedstatus as a highly technical, scientific, and complex field. Typical areas examined include: ■Budget and control ■Equipment management ■Maintenance information systems ■Process capability and maintenance ■Process monitoring techniques ■Reliability-based maintenance ■Replacement and life cycle costs ■TQM and maintenance
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