Preventive maintenance strategy

Marlatt, G. A. (1985). Relapse prevention Theoretical rationale and overview of the model. In G. A. Marlatt J. R. Gordon (Eds.), Relapse prevention Maintenance strategies in the treatment of addictive behaviors (pp. 3-70). New York Guilford Press. 

Marlatt GA Gordon JR (eds.) (1985). Relapse Prevention Maintenance Strategies in the Treatment of Addictive Behaviours. New York Guilford Press... 

Some firms use Reliability Centered Maintenance (RCM) as part of their preventative maintenance strategy. 

This paper shows how a periodic preventive maintenance strategy can help to reduce the maintenance cost for passive components submitted to stress corrosion... 

To ensure the rehability of industry systems, preventive maintenance strategies are traditionally applied by means of Condition Monitoring (CM). CM is the continuous or periodic measurement and interpretation of the data and information to indicate the technical healthy condition of individual components to determine the needs for maintenance (Leaney Sharpe 1999). CM deals with the acquisition of data and information from both human operators and sensor systems and further with taking corrective or preventive maintenance actions on the components that are to fail (Niu et al. 2010). It means that traditional CM aims to R MM at either a parameter level or an individual components level (Leung Romagnoli 2002). Due to the interdependency among the parameters and the components within complex industry systems, advance R MM development, which is able... 

Preventive maintenance strategies, in its classical form, are hardly used in practice—there have been many modifications thereof which allow a more accurate reflection of the actual functioning of the technical process. 

If maintenance is performed, there are two principal maintenance strategies preventive and breakdown maintenance. These are not mutually exclusive, and may be combined even in the same piece of equipment. Take for example a private motor car. The owner performs a mixture of preventive maintenance (by adding lubricating oil, topping up the battery fluid, hydraulic fluid and coolant) with breakdown maintenance (e.g. only replacing the starter motor when it fails, rather than at regular intervals). 

Too little maintenance results in unexpected failures and consequential major losses of production and/or customers (Figure 7-1). This impractical approach is termed reactive strategy and should be avoided on all important machinery. Optimum maintenance strategy balances reasonable costs with maximum possible availability and reliability. The two main maintenance strategies employed by companies today are labelled predictive strategy and preventive strategy. These are part of a balanced approach as shown in Figure 7-2. 

The third step is to proceed to the component level because more than likely, the cause will be uncovered here. Table 62.2 shows machinery component failure modes commonly encountered in machinery failure analysis together with suggested standard life values, Weibull indices (/J), and responsiveness to preventable or predictable maintenance strategies. Referring to this table will help decision-making. To assist the analyst in documenting bad actor failure modes on the component level. 

Identified hazards can either be reduced at the root (e.g., reduction of inventory) or by introduction of protective systems (e.g., automatic emergency shutdown). The increased understanding of the chemistry and the process that is obtained from hazard evaluation procedures provides guidance for many other elements of process safety management as well (e.g., procedural instructions, emergency strategies, personnel training, and preventive maintenance). 

Maintenance tasks are either implemented proactively in order to prevent or minimize the chance of failure or reactively to correct a situation following failure. Preventive maintenance plans are derived from the EMEA process that will define the tasks and task frequencies required in order to maintain system reliability, consistency, and capability. Flaving applied the FMEA process in order to determine the maintenance strategy, it is essential that the system... 

Select a total QC strategy to provide an appropriate balance between statistical and nonstatistical QC procedures. With 90% error detection, depend on the statistical QC component and perform the minimal preventive maintenance, instrument function checks, and method validation tests required by good laboratory practice, manufacturers instructions, and regulatory and accreditation guidelines. 

System calibration refers to the periodic operational qualification of the HPLC, typically every 6 to 12 months in most regulated laboratories. This calibration procedure is usually coordinated with an annual preventative maintenance (PM) program and is performed immediately after PM. A calibration sticker is placed on the instrument to indicate its calibration status and readiness for GMP work. The reader is referred to the principles and strategies behind HPLC calibration criteria published elsewhere.8 A summary of the calibration procedures and acceptance criteria, including additional procedures recommended for initial operational qualification, is listed in Table 9.3. 

As previously discussed, the FMEA process can be used to determine the consequence of functional failure. This process can in turn be applied to the functionality provided by the information systems supporting the EAM strategy. For example, if an information system fails to generate preventative maintenance plans that are required for the periodic calibration of aitical temperature control loops, then the functionality of the information system responsible for the generation of these plans must be deemed GxP critical. Once again, we can see that the operating context must be considered, as it is the environment within which the plans are applied that determines GxP criticality. 

Implementation of preventive and predictive maintenance strategies and practices... 

The use of risk informed maintenance strategies should be considered, to provide a reasonable balance in the mixture of corrective, preventive and predictive maintenance (see paras 2.2-2.4) and to facilitate proactive maintenance rather than exclusively reactive maintenance. 

Moreover there are a lot of applications of BNs as support system for the maintenance strategies. An example of preventive maintenance is (Celeux et al. 2006) hut the greater part of the papers investigate the BNs as a diagnostic model for the condition based maintenance. 

This strategy is known as a control limit strategy in the framework of failure limit pohcy, refer to Wang (2002). It is assumed that only one type of preventive maintenance action can be performed. The preventive maintenance action is imperfect in the sense that the preventive action is done partially, so, the system is not as good as new after each maintenance action. For example, if the maintenance action is to seal breaches, then this action can be performed on a small surface of the structure then its impact will be less important than if it had been made on a large surface of the structure. In order to be able to know how much to improve the system, two improvement functions are proposed and compared in Section 4. 

In the same field as the previous works, Bevilacqua and Braglia (2000) used the AHP process to select the maintenance strategy for an important Itahan oil refinery involving five alternatives (preventive, predictive, condition-based corrective and opportunistic maintenance). 

As the analytical framework for regularity modelling has been established, a wide range of features may be included. At component level the Oyt s represent failure or repair rates. These rates may be influenced by preventive maintenance, renewal strategies, spare parts availabihty etc. Until now the following functionality has been implemented ... 

In order to achieve effective, safe, and reliable operation of all equipment in the inventory, the hospital uses interval-based inspections and preventive maintenance, corrective maintenance, or metered maintenance strategies. Model-specific strategies and preventive maintenance procedures developed for this equipment based on the risk stratification, the AHA Manual for Medical Equipment, manufacturer guidelines, and NFPA or ANSI standards. 

Maintenance strategy Develop a plan to introduce a proactive maintenance model with Preventive and Planned Maintenance at the top of planned priorities. This will provide more time for performing maintenance utilizing the Best Maintenance Repair Practices. ... 

Like most other preventive maintenance elements, initial guidance on lubrication should come from manufacturers. They should have extensive experience with their own equipment both in their test laboratories and in customer locations. They should know what parts wear and are frequently replaced. Therein lies a caution a manufacturer could, in fact, make short-term profits by selling large numbers of spare parts to replace worn ones. Over the long term, however, that strategy will backfire, and other vendors, whose equipment is less prone to wear and failure, will replace them. 

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