Preventive maintenance principles mit opencourseware. Conditionbased maintenance cbm has the ability to tackle this challenge by estimating the remaining time until equipment failure based on equipment conditions. Early on a distinction is made between an extended condition based maintenance system and one of its constituentparts, trending, where the main focus of this thesis lies. Butcher 2000, defines the maintenance technology as cbm is a set of maintenance actions based on realtime or near.
I maintenance is performed when the unit reaches age t. This approach promises cost savings over routine or timebased preventive maintenance, because tasks are performed only when warranted. Today, improvements in technology are making it easier to gather, store and analyze data for cbm. Cbm dictates that maintenance should only be performed when certain indicators show signs of decreasing performance or upcoming failure. This text attempts to present the fundamental justification for conditionbased maintenance together with enough analytic and practical guidance for its implementation.
Reliability centered maintenance vs condition based maintenance. Use the right techniques and tools for the right equipment. 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. 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. Condition monitoring and diagnostics general guidelines. In manufacturing, its application has been somewhat muted. Jun 23, 2017 condition based maintenance cbm is a maintenance strategy which, simply put, measures operational parameters in assets to determine a change in their condition, performing maintenance only when the need arises.
Reliability centered maintenance rcm is a process used to determine the maintenance requirements of any physical asset in its operating context. Effective maintenance management depends on applying the appropriate maintenance techniques. The primarily focus has been laid to highlight perspective view on the techniques which assist in the development of health prognosisbased or conditionbased maintenance tools and practices to. Unfortunately, most organizations take a reactive approach. Awareness of specific challenges to implementing preventive maintenance. An overview of timebased and conditionbased maintenance. The same prioritization applied to identify a, b and c equipment for time based maintenance is applied here to identify the critical equipment. This publication collects and analyses proven condition based maintenance strategies and techniques engineering and organizational in member states. For example, most people change the oil in their vehicles every 3,000 to 5,000 miles traveled.
Maintenance to trigger instrumentation work orders based on the health of the control loop. Condition based maintenance 1996 page 3 of 11 online vs. I condition based maintenance cbm i condition monitoring required, more appropriate scheduling. Condition based maintenance engineer jobs, employment.
Equipment failure probability curves showing the six time related patterns of failure. Conditionbased 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. An evaluation of condition based maintenance for a military. Conditionbased maintenance and machine diagnostics gives details of both offtheshelf solutions and analytic diagnostic techniques to enable a bespoke solution to be developed. Condition based maintenance cbm in the oil and gas. A comparison of timebased maintenance and condition.
Also referred to as conditiondirected maintenance or oncondition maintenance. The pf curve figure 2 is an artists version of the fault progression of a defect. This is done in order to predict machine failures and to do restoration to avoid hazards which could otherwise occur. Condition based maintenance continuously improving. Our service agreements are based on a condition based maintenance approach enabled by constant monitoring of your equipment performance. Reliability centered maintenance the field of reliability is well established with years of research and development originating in the. Or at least, the monitoring time must be shorter than the span of the pf interval.
By vibration measurement, oil analysis, measurements of harmful. Cbm can drastically reduce operating costs and increase the safety of assets requiring maintenance. Several aspects on condition based maintenance approach 2. Early on a distinction is made between an extended condition based maintenance system and one of its constituentparts, trending, where the main focus of. Condition based maintenance cbm is a maintenance strategy that monitors the actual condition of an asset to decide what maintenance needs to be done. Conditionbased monitoring is an accepted feature of many industries. Condition based maintenance strategy linkedin slideshare. Predetermined maintenance timebased maintenance tbm preventive maintenance carried out in accordance with established intervals of time or number of units of use such as scheduled maintenance but without previous item condition investigation ssen 306 2001,p. How to use condition based maintenance more effectively. Maintenance policies i time based maintenance tbm i easy to implement, no condition monitoring needed. This document are the presentation slides from a seminar based on iso 17359.
I conditionbased maintenance cbm i condition monitoring required, more appropriate scheduling. Jun 23, 2017 condition based maintenance is a strategy for maintenance based in the diagnosis, avoiding systematic task decided for period of time or counters hours, km, etc. The term, cbm, is often used with other terms such as predictive maintenance pdm, prognostic and health management phm, oncondition maintenance which comes from the u. Predictive maintenance is the complement of preventive maintenance. An overview of methods and techniques samuel telford, muhammad ilyas mazhar and ian howard department of mechanical engineering, curtin university, perth wa 6102, australia abstract. The equipment has sensors that communicate if its ok in realtime. These conditions can be any feature of equipment which indicates unstable behavior such as loud sound or high temperature. Taking the first steps toward conditionbased maintenance utility maintenance managers are increasingly coming to realize that its wasteful to perform maintenance on a fixed schedule.
Condition based maintenance and condition monitoring pf curve thinking figure 2. An overview of timebased and conditionbased maintenance in. Establishing a condition based maintenance program. Conditionbased maintenance is the practice of conducting maintenance on a machine when the assets condition reaches a disruptive level. On condition based maintenance policy sciencedirect. Conditionbased maintenance cbm refers to a collection of activities, inspections, tests and procedures that are performed in response to the failure or destabilization of equipment, a machine or a material. Conditionbased maintenance requires an investment in measuring equipment and staff upskilling so the initial costs of implementation can be high. Condition based maintenance cbm techniques, such as vibration monitoring, are becoming a very attractive.
Condition based monitoring cbm is a type of predictive maintenance that involves using sensors to measure the status of an asset over time while it is in operation. Cbm, condition based maintenance and replaces the earlier tbm, time based maintenance or in worst case nma no maintenance at all. It can quickly get confusing when people talk about preventive maintenance, condition based maintenance or predictive maintenance but actually have something else in mind than you do. The terms conditionbased maintenance, oncondition maintenance, and predictive maintenance are often used interchangeably 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. Aug 29, 2016 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. Conditionbased maintenance and machine diagnostics.
Many of them are making the transition to a conditionbased maintenance strategy. Again, using multiple monitoring points within the pf interval is even better and more advisable. Finally, future developments in the use of expert systems and a1 techniques are highlighted. Conditionbased maintenance cbm conditionbased maintenance, also known as predictive maintenance is the most modern and popular maintenance technique discussed in the literature dieulle et al. 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. Condition based maintenance strategy for equipment failure. On conditionbased maintenance for machine components. A comparison of timebased maintenance and conditionbased. It is far more than just applying condition monitoring technologies. This maintenance is performed after one or more indicators show that equipment is going to fail or that equipment performance is deteriorating. Department of defense and department of energy, online monitoring, or risk based maintenance. Through the utilization of various nondestructive testing and measuring techniques, predictive maintenance determines equipment status before a breakdown occurs. Based on the factory needs it is possible to apply cbm for other equipment too. Condition based maintenance cbm, also known as predictive maintenance, is an advancement in the maintenance philosophy.
Component selection for condition based maintenance, parameter selection for monitoring condition, evaluation of condition monitoring results are issues influencing the effectiveness of condition based maintenance. Condition based maintenance cbm is a maintenance strategy which, simply put, measures operational parameters in assets to determine a change in their condition, performing maintenance only when the need arises. As the machine communicates its condition, the data is saved within a computerized maintenance management system cmms in a way that is easily read by humans. Pdf technical design of condition based maintenance system. Condition based 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. The data collected can be used to establish trends, predict failure, and calculate remaining life of an asset. 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. Condition based maintenance cbm is an equipment maintenance procedure based on detecting the condition of the equipment in order to evaluate whether it will fail during some future period and. Condition based maintenance has been defined as maintenance actions based on actual condition objective evidence of need obtained from insitu, noninvasive tests, operating and condition measurement. Condition based maintenance is a strategy for maintenance based in the diagnosis, avoiding systematic task decided for period of time or counters hours, km, etc. Choose the maintenance strategy which gives maximum reward. Point p is the point at which the defect enters the system and is detectable. Jan 04, 2018 condition based maintenance cbm refers to a collection of activities, inspections, tests and procedures that are performed in response to the failure or destabilization of equipment, a machine or a material. This relatively new approach to maintenance uses data drawn during operations andor maintenance intervals to forecast the need for additional or future maintenance.
The complete conditionbased maintenance cbm guide fiix. Predictive maintenance training course by online distance. The concept, quite correctly, is based on the belief that if equipment can be evaluated, and. Cbm was introduced in 1975 in order to maximise the effectiveness of pm decision making. A general ruleofthumb is to set the intervals for inspection somewhere midway of the pf interval. Condition based maintenance condition based maintenance is the process of monitoring the condition of an asset and taking an action to avoid the consequences of a failure. Key steps to implementing conditionbased maintenance. Industry studies show that while 80% of control loops could use some maintenance, only 20% are critical enough to significantly impact the process operation and demand immediate maintenance. Across industry, many definitions are used when it comes to the different types of maintenance. 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. Preventive maintenance is a part of what is called planned or proactive maintenance and performs maintenance on scheduled. Key concept or principle defined and explained 35 min. Maintenance policies i timebased maintenance tbm i easy to implement, no condition monitoring needed.
Condition based maintenance and condition monitoring. The corrective approach, also called unplanned or reactive maintenance veldman et al. You will recall that preventive maintenance is time based. More competitive together reduce maintenance costs by standardized solutions and services within condition monitoring. An evaluation of condition based maintenance for a. Conditionbased maintenance allows preventive and corrective actions to be scheduled at the optimal time, thus reducing the total cost of ownership. Condition based maintenance cbm in the oil and gas industry. The terms condition based maintenance, on condition maintenance, and predictive maintenance are often used interchangeably. It focuses on responding to the root causes of machine or material failure, and dealing with those issues after problems occur. As a certified service supplier, we advise on maintenance requirements based on the actual condition of the equipment instead of calendar based schedules. Feb 21, 2017 condition based maintenance strategy 1.
With the introduction in the 1960s of the first boeing jumbo jets questions were raised about the sense of continuing with maintenance requirements based on the traditional bathtub curve maintenance paradigm present at the time. All these selections of components and parameters to be monitored. Condition based maintenance is the process of monitoring the condition of an asset and taking an action to avoid the consequences of a failure. Asset management is a systematic, lifecycle approach of operating, maintaining, upgrading, decommissioning and renewing assets and infrastructure costeffectively and to an acceptable standard. Utilizes some form of technology to detect equipment problems as they are. The term, cbm, is often used with other terms such as predictive maintenance pdm, prognostic and health management phm, on condition maintenance which comes from the u. Condition based maintenance cbm, or predictive maintenance pdm, is a maintenance strategy that involves monitoring and testing vital machine and equipment parameters for their state. If you dont have the right systems, processes and procedures in place, condition based maintenance can cost you more time, money and goodwill than its worth. Taking the first steps toward conditionbased maintenance. Point f is the point at which the defect has created a functional failure. The purpose of this thesis is to evaluate the possibility implementing a condition based of maintenance cbm system the military vehicle cv9035in.
Factors such as fault and failure modes, criticality and costeffectiveness need to be considered. Cbm can be further refined to rcm, reliability centered maintenance which is using rba, risk based analysis to give the priority to maintenance and replacement activities. Offline since the early 1990s, major interest in socalled online monitoring has started to appear in the industry. In particular, cbm is highly effective where safety and reliability is the paramount concern such. Condition based maintenance, also known as predictive maintenance is the most modern and popular maintenance technique discussed in the literature dieulle et al. Cbm introduces new maintenance techniques, which can be difficult to implement due to resistance within an organization. Predictive maintenance techniques are designed to help determine the condition of inservice equipment in order to estimate when maintenance should be performed. It has become a hot topic in recent years as it can have a significant impact on the operational performance and thus the profitability of an organization. Dec 02, 2015 conditionbased maintenance is the practice of conducting maintenance on a machine when the assets condition reaches a disruptive level. With condition based maintenance cbm one measure an assets condition and estimate the needed maintenance by the results. This post will contrast reliability centered maintenance rcm and condition based maintenance cbm.