Condition based maintenance and condition monitoring. An overview of timebased and conditionbased maintenance. Internet of things enabling conditionbased maintenance in. Cbm is based on using realtime data to prioritize and optimize maintenance resources. The paper discusses how the tbm and cbm techniques work toward maintenance decision making. Condition based maintenance, which is predictive in nature, is part of condition based monitoring. As it is normally used, pm minimizes downtime only. Conditionbased maintenance was introduced to try to maintain the correct equipment at the right time. Condition based maintenance is the process of monitoring the condition of an asset and taking an action to avoid the consequences of a failure. Then, based upon this factual information foundation, reliability engineering begins. Condition monitoring is a central part of a condition based maintenance strategy. Pdf condition based maintenance byron ellis academia. Implementation strategies and tools for condition based. A comparison of timebased maintenance and condition.
I condition based maintenance cbm i condition monitoring required, more appropriate scheduling. Reissues dod department of defense instruction dodi 4151. Predictive maintenance and conditionbased monitoring. Predictive maintenance is the complement of preventive maintenance. In manufacturing, its application has been somewhat muted.
Tools to prevent equipment failures rendela wenzel, eli lilly and company one of the crucial roles of a reliability engineer is to develop and maintain a longlasting and effective predictive and preventive maintenance program. Cbm dictates that maintenance should only be performed when certain indicators show signs of decreasing performance or upcoming failure. The goal of a cbm implementation is to move from a calendar based preventive. For example, if an image indicated a difference between a pulley belt temperature.
Conditionbased maintenance cbm is a maintenance strategy that monitors the actual condition of an asset to decide what maintenance needs to be done. Cbm is theory used in the industry and government to actively monitor the health of the components or system in order to optimize operating costs and determine maintenance needs. Condition based maintenance cbm offers the promise of enhancing the effectiveness of maintenance programs in a way that no other single concept has ever matched. Implement an optimum mix of maintenance technologies e. Maintenance instructions based on actual condition and usage. Technology has significantly enhanced our ability to detect and monitor the health and condition of critical components in army aviation. The paper discusses how the tbm and cbm techniques work toward maintenance decision.
Condition monitoring cm is the monitoring of several parameters such as equipment vibration. Condition based monitoring is an accepted feature of many industries. A wellorchestrated condition monitoring system is an opportunity for continuous improvement, and the impacts can be dramatic. I maintenance is performed when the unit reaches age t. Condition based maintenance cbm or predictive maintenance is a technology that strives to identify incipient faults before they become critical which enables more accurate planning. Preventive maintenance pm, as scheduled maintenance tends to be called, doesnt prevent anything, navarro says.
Cbm data allows maintenance personnel to perform maintenance at the exact moment it is needed, prior to failure. Observing the state of the system is known as condition monitoring. How and why is this ability to detect and visualize an objects temperature proile. Physical inspections are reduced or eliminated cbm working group cbm program objectives are.
Though the term is used in industry, it is used incorrectly. An introduction to condition based maintenance cbman approach to cbm application and management by. Cbm is a set of maintenance actions based on realtime or nearreal time assessment of equipment condition which is obtained from embedded sensors it allows. Condition based maintenance cbm uses sensor devices to collect realtime measurements ie. The cbm philosophyit is about utilising the condition monitoring technologies topredict the failure patterns of an asset. With the advent of smallscale computing technology, such as embedded sensors in valuable equipment, companies can now engage in condition based maintenance. Reliabilitycentered maintenance methodology reliabilitycentered maintenance rcm is the optimum mix of reactive, time or interval based, condition based, and proactive maintenance practices. The concept, quite correctly, is based on the belief that if equipment can be evaluated, and. Under cbm, maintenance only occurs when data indicates a decline in performance or the early warning signs of failure. Conditionbased maintenance cbm is a maintenance philosophy used by industry to actively manage the health condition of assets in order to perform maintenance only when it is needed and at the most opportune times. Such a system will determine the equipments health, and act only when maintenance is actually necessary. The condition based maintenance plus approach to maintenance. Condition based monitoring cbm and predictive maintenance pm are two maintenance strategies which aim at optimizing equipment efficiency and reducing service timing and costs during equipment lifecycle. Condition based maintenance in particular can be expensive due to the cost of maintaining sensor devices, so its best used on critically important equipment.
These principal maintenance strategies, rather than being applied independently, are integrated to take advantage of their re. Offline since the early 1990s, major interest in socalled online monitoring has started to appear in the industry. You will recall that preventive maintenance is time based. The overall benefits of condition based maintenance management have proven to substantially improve the overall operation of both manufacturing and process plants. Cbm is maintenance based on evidence of need, and rcm provides the rules of evidence.
A condition monitoring system enhances safe operation, preserves assets and minimizes environmental impact. For example, most people change the oil in their vehicles every 3,000 to 5,000 miles traveled. In recent decades, research on cbm has been rapidly growing due to the rapid development of computer based monitoring technologies. By combining these technological advances with the existing systems for vibration analysis, we have developed a. Implementing conditionbased maintenance using realtime. Maintenance policies i time based maintenance tbm i easy to implement, no condition monitoring needed. One issue is to implement the conditionbased maintenance cbm approach that makes a diagnosis of the asset status based on wire or wireless monitored data, predicts the assets abnormality, and. There is no such thing as monitoring something based on condition. Reductions in the total labor needed to maintain facilities in the required condition 5. This paper presents an overview of two maintenance techniques widely discussed in the literature.
The guiding principle of ppm is the regular and systematic application of engineering knowledge and maintenance attention to equipment and facilities to ensure their proper functionality and to reduce their rate of deterioration. The purpose of this paper is to demonstrate how internet of things iot technology can enable highly distributed elevator equipment servicing by using remotemonitoring technology to facilitate a shift from traditional corrective maintenance cm and time based maintenance tbm to more predictive, condition based maintenance cbm in order to. Choose the maintenance strategy which gives maximum reward. Condition based maintenance cbm is a maintenance strategy that collects and assesses realtime information, and recommends maintenance decisions based on the current condition of the system. This will allow maintenance to be scheduled based onequipment condition and not time. The pf curve condition based maintenance is a preventive maintenance tactic which utilises condition monitoring as a data gathering technique to assess the health of critical assets at a facility. Condition based maintenance also known as cbm is a maintenance methodology in which maintenance operations are performed depending on the current condition of your assets. Effectiveness of condition based maintenance in army aviation, by maj marc p. This relatively new approach to maintenance uses data drawn during operations andor maintenance intervals to forecast the need for additional or future maintenance. Department of defense instruction under secretary of. Infrastructure and configuration required to turn diagnostics into information.
The complete conditionbased maintenance cbm guide fiix. Navy surface ship rcm processes zclassic rcm initial maintenance requirements development zbackfit rcm surfmer program institutionalizing rcm discussion. This text attempts to present the fundamental justification for condition based maintenance together with enough analytic and practical guidance for its implementation. Condition based maintenance 1996 page 3 of 11 online vs. The condition based maintenance data eliminated the need for many of the repairs that would normally have been included in the maintenance outage. Instead of maintaining equipment based on a predefined schedule, this type of.
Condition based maintenance cbm, also known as predictive maintenance, is a maintenance practice that derives maintenance requirements, in large part, from realtime assessment of platform or weapon system condition obtained from embedded sensors andor external tests and measurements using builtin diagnostic equipment. Bleymaier director of logistics, engineering, and force protection headquarters, air mobility command. Conditionbased maintenance and machine diagnostics. Conditionbased maintenance is a predictive maintenance strategy where various elements of an operating asset are observed and measured over time to identify and prevent deterioration and possible failure at the earliest possible moment. Both predictive and condition based maintenance can be expensive to initiate, though they both justify their upfront cost by saving money on downtime and equipment maintenance. More competitive together reduce maintenance costs by standardized solutions and services within condition monitoring. Cbm can drastically reduce operating costs and increase the safety of assets requir ing maintenance.
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