Single cycle, the easiest form in which you define exactly one time based maintenance plan. In effect, its a reservation system that dedicates capacity at a specific time in the week. The final improvement strategy was the incorporation of information technology. The around 20% usage or time based repetitive failures are addressed by doing preventative maintenance and scheduled replacement maintenance well before failure can occur. This publication collects and analyses proven condition based maintenance strategies and techniques engineering and organizational in member states. If you want to perform time based or performance based counter based maintenance planning, you can work with both single cycle plans as well as strategy plans. Finally, best prioritization maintenance strategy is predictive maintenance pm, time base maintenance tbm and corrective maintenance cm correctly. Determining maintenance strategy by using fuzzy group madm. Employing the proper maintenance strategy that ensures the right work is performed at the right time with a minimally invasive methodology will help drive improvements in reliability, thereby stimulating increased productivity and the lifecycle of an asset. Strategic maintenance management 101 what, why and how.
These predictions are based on the condition of the equipment that is evaluated based on the data gathered through the use of various condition monitoring. Risk assessment a maintenance strategy whereby the maintenance processes are planned based on failure risks, effects, and calculated costs. Best practices handbook on asphalt pavement maintenance. Ppm has been described as the most effective maintenance strategy against the frequency of breakdown seeley, 1976. The goal of such a program is to extend pavement life and enhance systemwide performance in a costeffective and efficient way. Time based maintenance lends itself perfectly to service agreements as the scope of the tasks and their intervals are clearly defined and can be appended to the agreement or referenced to applicable standards. Maintenance strategy is based on the factors asset strategy, targets, policies, practices, aims and objectives and benchmarking maintenance strategy as on overall depends on various. Work package can be a inspection, maintenance, service, etc. This means that time is the maintenance trigger for this type of maintenance. It includes selected papers on maintenance optimization presented during its preparation. In the case of reactive maintenance strategy, maintenance action is planned and executed in reaction to a failure occurrence post failure planning.
Studies show that preventive maintenance is six to ten times more costeffective than a do nothing maintenance strategy. Predictive maintenance is the complement of preventive maintenance. Sap preventative maintenance tutorial free sap pm training. There are 9 types of maintenance split between preventive maintenance and corrective maintenance.
Preventive maintenance pm also known as timebased or intervalbased maintenance. If one were to graph the failure rate a component population versus time, it is likely the graph would take the. Sep 18, 2019 the maintenance strategy is used in both time based and performance based maintenance, since either time duration or performance level can be used as performance indicators. The specific based technique, as its name implies, is a specific maintenance technique that has unique principles for solving maintenance problems. Selecting a successful maintenance strategy requires a good knowledge of equipment failure behaviour and maintenance management practices. Observing the state of the system is known as condition monitoring. Duration and variability in preventive maintenance are key. Preventive maintenance principles mit opencourseware. On condition based maintenance policy sciencedirect. Timebased maintenance tbm is maintenance performed on equipment based on a calendar schedule. Army industrial base strategic plan which is a strategic plan for the organic and commercial industrial bases, the army materiel command human capital.
In the case of equipment where investment costs are low and a fault will have only a minor effect, this proce dure may result in the. Maintenance is a risk management practice used to maximise production and minimise loss and waste. The best way to start is putting more resources for the critical equipment or the most important equipment. These plans require cycle start dates, a call horizon, and a cycle set. The goal of this approach is to extend the useful life of an asset and prevent breakdowns from occurring. This is most applicable to the materials and equipment that are absolutely indispensable to a company. Preventive maintenance pm also known as time based or interval based maintenance. In this activity you create maintenance strategy in sap to define the frequency of specific work packages for a type of equipment. Tbm maintenance is planned maintenance, as it must be scheduled in advance. Cbm is based on using real time data to prioritize and optimize maintenance resources. Maintenance activities are performed on a calendar or operating time interval basis to extend the life of the equipment and prevent failure. Maintenance has during a long period of time mostly been associated with costs and stoppages. To represent complex maintenance cycles, you can create a strategy plan based on a time based maintenance strategy. Such a system will determine the equipments health, and act only when maintenance is.
But nonage related failures cannot be addressed by timed renewal based maintenance strategies, they require different solutions. In corrective maintenance, the repair or retrofitting activities are only performed after the facility fails to meet the requirement of operation. Impact of maintenance strategies on the performance of. An indication of whether the failure is detectable during normal operation. The amount of time that the equipment is expected to be down each time corrective maintenance is required. Maintenance may then be fixed time or unfixed time based.
Timebased maintenance tbm forms an underlying principle that applies to all four maintenance strategies. According to chan et al 2001, the time based, performance based, breakdown based, renovation based and integration based are also developed from the three basic maintenance strategies. Maintenance planning csagpm prmmp sap ag maintenance planning csagpm prmmp 10 april 2001 splitlevel maintenance one of the most significant advantages offered by the plant maintenance application component is the option of splitlevel maintenance. Implementing conditionbased maintenance using realtime. How to apply the correct maintenance strategy to your assets. Time based preventive maintenance plans are used in cases where frequency of orders are required based on a time schedule calendar dates. Timebased maintenance lends itself perfectly to service agreements as the scope of the tasks and their intervals are clearly defined and can be appended to the agreement or referenced to applicable standards.
Generally, the maintenance strategy is classified into two categories, based on the repair timing. Condition based maintenance strategy for equipment failure. Maintenance policies i time based maintenance tbm i easy to implement, no condition monitoring needed. This is a cost we could minimize under a different maintenance strategy. Maintenance is undertaken in a variety of forms, to ensure that the plant and equipment continues to do what the users want it to do. The time based maintenance is carried out at predetermined intervals of time or on the base of prescribed criteria and aimed at reducing the probability of failure or the working deterioration of the element. Deciding on a, suitable approach or strategy is no trivial task. Maintenance strategy development doesnt seem to take into account previous work or current plans there is a disconnect between strategy development and practical deployment maintenance strategy development becomes opinion based rather than justified on the basis of data and document assumptions. An analysis of maintenance strategies and development of a. Smarter mro 5 strategies for increasing speed, improving. These are time estimates given only to identify broad changes. Time based maintenance continuously improving manufacturing. Cost consideration is a key factor in any developed strategy as no key can function without cost input.
This strategy is based on establishing maintenance periods a priori, to revise the state of the asset or. The around 20% usage or timebased repetitive failures are addressed by doing preventative maintenance and scheduled replacement maintenance well before failure can occur. A maintenance strategy defines the rules for the sequence of planned maintenance work. You can create a maintenance plan, and consequently. Selecting the correct maintenance strategy reliabilityweb. Implementation strategies and tools for condition based. However, time based refurbishment usually proves to be the most effective maintenance strategy. The terms condition based maintenance, oncondition maintenance, and predictive maintenance are often used interchangeably. An analysis of maintenance strategies and development of a model for strategy formulation. A comparison of timebased maintenance and conditionbased. Actions performed on a detect, preclude, or mitigate degradation of a component or system with the aim of controlling degradation to an acceptable level. With predictive devices currently available, it is incumbent upon. Risk based maintenance attempts to balance the probability of failure pof and consequences of failure cof of each asset.
An escalation procedure is in place for reasonable adjustments for. An overview of timebased and conditionbased maintenance. Through the utilization of various nondestructive testing and measuring techniques, predictive maintenance determines equipment status before a breakdown occurs. Maintenance of such physical assets is normally based on proven maintenance es, philosophies, theoriesapproach and strategies. I condition based maintenance cbm i condition monitoring required, more appropriate scheduling. I maintenance is performed when the unit reaches age t. Time based maintenance, failure finding maintenance, risk based maintenance, condition based maintenance and predictive maintenance. Correct equipment maintenance management strategy selection. Maintenance strategy an overview sciencedirect topics. As a result from this research, a process for the formulation of maintenance strategies has been developed. A comparison of timebased maintenance and condition. A maintenance strategy that is based on measuring the condition of assets to assess whether they will fail during some future period, and then taking appropriate action to avoid the consequences of that failure.
Points out that increasing pressure to prolong the useful life of a building without compromising the objectives of maintenance has led to an increasing interest in methods of integrated maintenance management. Pdf the influence of practical factors on the benefits of condition. It contains general scheduling information, and can therefore be assigned to as many maintenance task lists pm task lists and maintenance plans as required. The pros and cons of different maintenance strategies. Maintenance based on the equipment performance monitoring and the control of the corrective actions taken as a result.
One issue is to implement the conditionbased maintenance cbm approach. Preventive maintenance is done before a failure occurs and consists of maintenance types like. Methodology development of an effective maintenance strategy for critical equipment requires a sound. Predictive maintenance is a proactive maintenance strategy that tries to predict when a piece of equipment might fail so that maintenance work can be performed just before that happens. In a 24x7 manufacturing operation, it is typically better to perform the 10 hours of activities in several smaller periods of time, for instance 5 pm activities that take 2 hours each. An overview of timebased and conditionbased maintenance in. Strategies and concepts such as conditionbased maintenance cbm have. Multiple cycle strategy, used to show complex maintenance cycles.
One that delivers high quality output, on time, every time. Industries are with a number of faced available maintenance theories, models, and frameworks. Application of reliability centred maintenance to optimize. As such, the practical operation of a component is time based function. Development of equipment maintenance strategy for critical equipment. Pdf an overview of timebased and conditionbased maintenance. An analysis of maintenance strategies and development of a model for strategy formulation a case study master of science thesis in the master degree programme, production engineering.
Reliability centred maintenance determines what maintenance needs to be performed and what testing and inspection needs to be performed to support the maintenance strategy. This means that it can be used with both predictive maintenance and preventative maintenance. Time based maintenance tbm forms an underlying principle that applies to all four maintenance strategies. Sep 20, 2017 sap offers four different types of maintenance plans. Maintenance strategy april 19, 2020 top 5 plant engineering articles april 19, 2020 articles about best practices for essential manufacturing, covid19 safety, protecting the supply chain, asset performance management and robots fighting covid19 were plant engineerings five most clicked articles from april 19, 2020.
This paper presents an overview of two maintenance techniques widely discussed in the literature. Overview of maintenance strategy, acceptable maintenance. Maintenance is carried out when certain indicators give the. You can define maintenance strategy in sap pm by using the following navigation method. Condition based maintenance was introduced to try to maintain the correct equipment at the right time. A way to do that is establish some criteria to sort the equipment in a, b, c categories. The real actual equipment condition is continuously assessed by the online detection of significant working device parameters and their automatic comparison with average values and performance. With around 80% of equipment failures being totally unpredictable based on the equipments age alone, you must have an oncondition maintenance strategy to deal with them. The paper discusses how the tbm and cbm techniques work toward maintenance decision making.
The condition based maintenance strategies that incorporate the costs into the decisionmaking process are shown to be more costeffective over the pure risk based and time based strategies 12. Also known as proactive maintenance, this method involves periodically taking assets offline and inspecting or repairing them at predetermined intervals usually time or event based triggers. Development of equipment maintenance strategy for critical. Each of this work packages consists the different frequencies. A beginningstart ppm practices immediately if you expect to establish an efficient operating system. Time based maintenance tbm is maintenance performed on equipment based on a calendar schedule. The maintenance strategy is used in both time based and performance based maintenance, since either time duration or performance level can be used as performance indicators. Maintenance strategies manufacturer oem recommendations, and is based on a scientific can be broadly classified into corrective maintenance cm and. To ensure that you have a viable maintenance strategy, first examine the scheduled maintenance activities that are currently being performed. Preventive maintenance scheduled also known as proactive maintenance, this method involves periodically taking assets offline and inspecting or repairing them at predetermined intervals usually time or event based triggers. Single counter, defines exactly one performance based plan.
The armys depot maintenance enterprise strategic plan should be used in conjunction with the u. Time slicing for external service providers and internal operations such as cleaning and heat treatment, time slicing helped overcome long queues. The timebased maintenance tbm strategy that we adopt is the agebased main. Make sure there is an appropriate balance of conditional inspections, preemptive replacements, monitoring technology applications, andor runtofailure strategies based on observed asset behavior. Pdf maintenance strategy selection and its impact on. In a time based maintenance strategy, assets are periodically inspected, serviced and cleaned, with parts replaced in an effort to prevent sudden failure. Examples of specific based technique are time based maintenance tbm and condition based maintenance cbm. For more information, see single cycle plan and strategy plan. In the case of equipment where investment costs are low and a fault will have only a minor effect, this proce dure may result in the lowest overall costs. Preventive and predictive maintenance 700zb00102 46 11. Once created, you can create a maintenance strategy for which you define.
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