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. These plans require cycle start dates, a call horizon, and a cycle set. Such a system will determine the equipments health, and act only when maintenance is. Time based maintenance tbm forms an underlying principle that applies to all four maintenance strategies. 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.
Preventive maintenance principles mit opencourseware. There are 9 types of maintenance split between preventive maintenance and corrective maintenance. Single counter, defines exactly one performance based plan. You can define maintenance strategy in sap pm by using the following navigation method. Development of equipment maintenance strategy for critical equipment. This is most applicable to the materials and equipment that are absolutely indispensable to a company. Predictive maintenance is the complement of preventive maintenance. Maintenance activities are performed on a calendar or operating time interval basis to extend the life of the equipment and prevent failure. Actions performed on a detect, preclude, or mitigate degradation of a component or system with the aim of controlling degradation to an acceptable level. This is a time interval based maintenance practice. Risk based maintenance attempts to balance the probability of failure pof and consequences of failure cof of each asset.
The terms condition based maintenance, oncondition maintenance, and predictive maintenance are often used interchangeably. The specific based technique, as its name implies, is a specific maintenance technique that has unique principles for solving maintenance problems. However, time based refurbishment usually proves to be the most effective maintenance strategy. 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. 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.
Work package can be a inspection, maintenance, service, etc. An indication of whether the failure is detectable during normal operation. Time based maintenance, failure finding maintenance, risk based maintenance, condition based maintenance and predictive maintenance. Maintenance is carried out when certain indicators give the. Development of equipment maintenance strategy for critical.
Determining maintenance strategy by using fuzzy group madm. Ppm has been described as the most effective maintenance strategy against the frequency of breakdown seeley, 1976. Preventive maintenance pm also known as time based or interval based maintenance. Each of this work packages consists the different frequencies. Make sure there is an appropriate balance of conditional inspections, preemptive replacements, monitoring technology applications, andor runtofailure strategies based on observed asset behavior. Observing the state of the system is known as condition monitoring. Maintenance is a risk management practice used to maximise production and minimise loss and waste. On condition based maintenance policy sciencedirect. Maintenance policies i time based maintenance tbm i easy to implement, no condition monitoring needed. Condition based maintenance as a strategy therefore looks for physical evidence. Cost consideration is a key factor in any developed strategy as no key can function without cost input. As such, the practical operation of a component is time based function. Maintenance of such physical assets is normally based on proven maintenance es, philosophies, theoriesapproach and strategies.
In this activity you create maintenance strategy in sap to define the frequency of specific work packages for a type of equipment. A way to do that is establish some criteria to sort the equipment in a, b, c categories. 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. The armys depot maintenance enterprise strategic plan should be used in conjunction with the u. Application of reliability centred maintenance to optimize. Time based preventive maintenance plans are used in cases where frequency of orders are required based on a time schedule calendar dates.
Correct equipment maintenance management strategy selection. This is a cost we could minimize under a different maintenance strategy. Finally, best prioritization maintenance strategy is predictive maintenance pm, time base maintenance tbm and corrective maintenance cm correctly. Maintenance based on the equipment performance monitoring and the control of the corrective actions taken as a result. I condition based maintenance cbm i condition monitoring required, more appropriate scheduling. Maintenance may then be fixed time or unfixed time based. In effect, its a reservation system that dedicates capacity at a specific time in the week.
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. Duration and variability in preventive maintenance are key. The timebased maintenance tbm strategy that we adopt is the agebased main. Methodology development of an effective maintenance strategy for critical equipment requires a sound. Strategic maintenance management 101 what, why and how. 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. 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. Selecting a successful maintenance strategy requires a good knowledge of equipment failure behaviour and maintenance management practices. Industries are with a number of faced available maintenance theories, models, and frameworks. 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. Implementing conditionbased maintenance using realtime. You can create a maintenance plan, and consequently. The around 20% usage or time based repetitive failures are addressed by doing preventative maintenance and scheduled replacement maintenance well before failure can occur.
Maintenance strategies can be classed into those that are timebased tbm and those that are principally conditionbased cbm. An escalation procedure is in place for reasonable adjustments for. 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. Sep 20, 2017 sap offers four different types of maintenance plans. Comparing maintenance strategies based on cost and. 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. Condition based maintenance strategy for equipment failure. Tbm maintenance is planned maintenance, as it must be scheduled in advance. Pdf an overview of timebased and conditionbased maintenance.
Preventive maintenance pm also known as timebased or intervalbased maintenance. 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. Studies show that preventive maintenance is six to ten times more costeffective than a do nothing maintenance strategy. 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. Preventive maintenance is done before a failure occurs and consists of maintenance types like. Timebased maintenance tbm is maintenance performed on equipment based on a calendar schedule. The pros and cons of different maintenance strategies. Impact of maintenance strategies on the performance of. An analysis of maintenance strategies and development of a. Time slicing for external service providers and internal operations such as cleaning and heat treatment, time slicing helped overcome long queues. Examples of specific based technique are time based maintenance tbm and condition based maintenance cbm. How to apply the correct maintenance strategy to your assets.
Timebased maintenance tbm forms an underlying principle that applies to all four maintenance strategies. Multiple cycle strategy, used to show complex maintenance cycles. Single cycle, the easiest form in which you define exactly one time based maintenance plan. This strategy is based on establishing maintenance periods a priori, to revise the state of the asset or. Pdf the influence of practical factors on the benefits of condition. In the case of reactive maintenance strategy, maintenance action is planned and executed in reaction to a failure occurrence post failure planning. While this allows those responsible for maintenance and servicing to reduce the likelihood of failure through scheduled checks and is far more effective than running breakdown maintenance, it. The goal of such a program is to extend pavement life and enhance systemwide performance in a costeffective and efficient way. The goal of this approach is to extend the useful life of an asset and prevent breakdowns from occurring. The goal of a cbm implementation is to move from a calendar based preventive maintenance program. Deciding on a, suitable approach or strategy is no trivial task.
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. Pdf maintenance strategy selection and its impact on. Generally, the maintenance strategy is classified into two categories, based on the repair timing. But nonage related failures cannot be addressed by timed renewal based maintenance strategies, they require different solutions. Risk assessment a maintenance strategy whereby the maintenance processes are planned based on failure risks, effects, and calculated costs. The final improvement strategy was the incorporation of information technology. Time based maintenance tbm is maintenance performed on equipment based on a calendar schedule. As a result from this research, a process for the formulation of maintenance strategies has been developed. A maintenance strategy defines the rules for the sequence of planned maintenance work. Overview of maintenance strategy, acceptable maintenance. Strategies and concepts such as conditionbased maintenance cbm have.
One that delivers high quality output, on time, every time. Maintenance strategies manufacturer oem recommendations, and is based on a scientific can be broadly classified into corrective maintenance cm and. One issue is to implement the conditionbased maintenance cbm approach. 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. If one were to graph the failure rate a component population versus time, it is likely the graph would take the. Best practices handbook on asphalt pavement maintenance. 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. These are time estimates given only to identify broad changes. The amount of time that the equipment is expected to be down each time corrective maintenance is required. Reliability centred maintenance determines what maintenance needs to be performed and what testing and inspection needs to be performed to support the maintenance strategy. Preventive and predictive maintenance 700zb00102 46 11. 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 production systems of today are often guided by a complex production strategy. A beginningstart ppm practices immediately if you expect to establish an efficient operating system. It includes selected papers on maintenance optimization presented during its preparation. To represent complex maintenance cycles, you can create a strategy plan based on a time based maintenance strategy. The probability density function pdf that describes the probability that the equipment will fail due to a particular failure cause. Army industrial base strategic plan which is a strategic plan for the organic and commercial industrial bases, the army materiel command human capital. 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.
Implementation strategies and tools for condition based. Condition based maintenance was introduced to try to maintain the correct equipment at the right time. Cbm is based on using real time data to prioritize and optimize maintenance resources. 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. In corrective maintenance, the repair or retrofitting activities are only performed after the facility fails to meet the requirement of operation. The paper discusses how the tbm and cbm techniques work toward maintenance decision making. Equality this maintenance strategy aims to support diversity by recognising all customers needs and by treating them equally. The definition of pm a pm, by definition, is a repairreplace activity that will restore the functionality or useful life of an asset back to its original state. Time based maintenance continuously improving manufacturing.
I maintenance is performed when the unit reaches age t. 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 means that time is the maintenance trigger for this type of maintenance. To ensure that you have a viable maintenance strategy, first examine the scheduled maintenance activities that are currently being performed. The around 20% usage or timebased 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. 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. A comparison of timebased maintenance and condition. Maintenance strategy an overview sciencedirect topics. This paper presents an overview of two maintenance techniques widely discussed in the literature.
Sap preventative maintenance tutorial free sap pm training. 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. An overview of timebased and conditionbased maintenance in. 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. Once created, you can create a maintenance strategy for which you define. A comparison of timebased maintenance and conditionbased. 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. Through the utilization of various nondestructive testing and measuring techniques, predictive maintenance determines equipment status before a breakdown occurs. With predictive devices currently available, it is incumbent upon. 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. 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. 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 best way to start is putting more resources for the critical equipment or the most important equipment.
Smarter mro 5 strategies for increasing speed, improving. This means that it can be used with both predictive maintenance and preventative maintenance. 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. In a time based maintenance strategy, assets are periodically inspected, serviced and cleaned, with parts replaced in an effort to prevent sudden failure. An overview of timebased and conditionbased maintenance. An analysis of maintenance strategies and development of a model for strategy formulation.
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