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Lean Process Improvement
Published in James William Martin, Operational Excellence, 2021
Preventive and corrective maintenance systems are deployed to ensure equipment is available. Effective preventive and corrective maintenance programs rely on reliable equipment and developing optimum combinations of preventive and corrective maintenance of each piece of equipment. Takt time is more stable when equipment is up and running to support production. Table 6.7 describes planning for unscheduled (corrective) versus scheduled maintenance (preventive). Planning includes establishing equipment classifications, identifying failure probabilities, and managing information related to usage, schedule maintenance, and contingencies for handling breakdowns. Planning is used to assign maintenance responsibilities and budgets on the basis of equipment design, the systems to monitor and schedule maintenance, and metrics to track equipment performance and costs against budget. Training is also important for the people supporting the maintenance system.
Conducting the Audit
Published in Sasho Andonov, The Art of Safety Auditing, 2019
Corrective maintenance is done when something is wrong with equipment or with the operation. It is usually a process of fault-fixing for equipment and failure rectification with the operation. Preventive maintenance is regular and routine, but corrective maintenance happens not very often. So, it requires more efforts from employees in the company. They must have particularly good knowledge about normal functioning of the equipment and must be familiar with the methods how to find what is wrong and how it can be fixed. Additional skills are also necessary for corrective maintenance. Corrective maintenance in industry is an activity similar to going to the doctor when you feel sick: The doctor will diagnose the problem (find what is wrong!) and he will provide a cure (fix the problem and recover your body functioning).
Framework for maintenance management of shield tunnel using structural performance and life cycle cost as indicators
Published in Dan M. Frangopol, Hitoshi Furuta, Mitsuyoshi Akiyama, Dan M. Frangopol, Life-Cycle of Structural Systems, 2018
Jianhong Wang, Atsushi Koizumi, Hiroshi Tanaka
Infrastructure management discussion should account for deterioration model and maintenance philosophies (Das, 1999; Frangopol, Kallen, & Van Noortwijk, 2004; Yuan, Jiang, & Liu, 2013). Maintenance philosophies are classified under three categories based on maintenance timing: corrective, preventive and predictive (Figure 1). Corrective maintenance involves activity performed to repair a fault or restore a failed facility to operational or safe conditions; i.e. the maintenance work is carried out after failure. Both preventive and predictive maintenance philosophies are intended to ensure the safety of facilities, but the former prevents incipient failure by employing periodic inspection and repair, whereas the latter is based on condition-based prediction using probability theory. More details on these maintenance philosophies can be obtained from the literature published by the Department of Defense (DoD, 2008).
Utilization of acoustic signals with generative Gaussian and autoencoder modeling for condition-based maintenance of injection moulds
Published in International Journal of Computer Integrated Manufacturing, 2022
G. Ø Rønsch, I. López-Espejo, D. Michelsanti, Y. Xie, P. Popovski, Z.-H. Tan
Maintenance is an essential topic within manufacturing companies, and optimization of existing maintenance procedures is often addressed within Industry 4.0. An effective maintenance setup is a foundation for keeping a high production throughput and ensuring a consistent and high product quality level. As stated by Salonen and Deleryd (2011), maintenance can generally be split into two categories: corrective and preventive. Corrective maintenance refers to the set of reactive procedures aimed to address failures that occur randomly. These failures are often caused by lack of preventive maintenance or poor equipment reliability. Preventive maintenance is performed proactively to uphold high equipment performance and thereby reduce the need for corrective maintenance. There is always a cost/benefit trade-off between the resources spent for preventive maintenance and the resulting cost of corrective maintenance. One way to address this trade-off is to adopt data-driven condition-based maintenance, where the focus is on continuously monitoring the equipment performance and detecting when maintenance is needed. As described by Spendla et al. (2017), the overall benefit of using condition-based maintenance is that interventions can be conducted on an as-needed basis, thereby optimizing the availability of the manufacturing equipment.
Accessibility for maintenance in the engine room: development and application of a prediction tool for operational costs estimation
Published in Ship Technology Research, 2022
Paola Gualeni, Fabio Perrera, Mattia Raimondo, Tomaso Vairo
In the maritime field, as in many other sectors, maintenance can usually be implemented regarding three different approaches: Preventive maintenance (PM): this type of maintenance is based on the operating hours of the item, and it is performed even if the item is not broken. These interventions are recommended by the supplier with reference to a certain number of operating hours. Ideally, with the PM, nothing breaks down.Corrective maintenance: it is made after the detection of a failure and aims to restore the initial condition of the item.Condition -based or Predictive maintenance (PdM): it is the most recent type of maintenance, where sensors are used to archive data about the system under consideration. These data are used in conjunction with analysed historical trends to continuously evaluate the system’s health and possibly predict a breakdown before it happens.
Maintenance, shutdown and production scheduling in semiconductor robotic cells
Published in International Journal of Production Research, 2018
Below, we review the relevant literature addressing the planning and scheduling of maintenance activities and shutdowns with particular focus on the semiconductor industry. The literature classifies maintenance activities into several categories. First, preventive maintenance and corrective maintenance activities are distinguished. Corrective maintenance activities are those performed in response to hard or soft machine failures, whereas preventive maintenance is intended to avert machine failures. Corrective maintenance is typically not plannable, whereas preventive maintenance is. In most cases, technicians are dedicated to conducting preventive and/or corrective maintenance. Preventive maintenance may be categorised into condition-, time- and volume-based maintenance. Condition-based measurements trigger condition-based maintenance activities, which are generally unplannable. Time-based maintenance activities are triggered after a certain time has elapsed, whereas volume-based maintenance activities are performed once a certain workload has been processed. Further, Pham and Wang (1996) classify five degrees to which operating conditions are restored by maintenances: perfect, minimal, imperfect, worse and worst. Usually, maintenances are assumed to restore the system to an ‘as good as new’ (perfect) state or and ‘as bad as old’ (minimal) state. However, other works, such as Liu and Huang (2010) or Liu et al. (2013) assume that maintenance results in a system state between these two extremes (imperfect). Overall, maintenance optimisation has received thorough attention in the existing literature. Dekker and Scarf (1998) or Wu and Zuo (2010), for instance, provide reviews about maintenance.