difference between maintenance and reliability

This post will contrast reliability centered maintenance (RCM) and condition based maintenance (CBM). In most cases the reliability of a factory is delegated to the maintenance manager however few can articulate the difference between reliability and maintenance. Here, Availability is the time an equipment remains operational to perform its required function, in a specific time period. As part of our series on reliability and condition based maintenance programs, we are reviewing some of the fundamental terms of maintenance. Another important aspect is to evaluate how long it typically takes to remediate problems. This should allow repair activity to be scheduled and completed either before or within the P-F interval (and before functional failure). Did you know the difference between planning and scheduling? We note the difference between service and maintenance, primarily to address a frequent confusion of priorities for reliability engineering studies. Industrial Press, Inc, [5] SAE JA1011, Evaluation Criteria for Reliability-Centered Maintenance, Jeff Knight SAE standard JA1011 defines RCM as a specific process used to identify the policies that must be implemented to manage the failure modes that could cause the functional failure of any physical asset in a given operational context. Even fewer can define the difference between normal maintenance and reliability-centred maintenance. Determine what happens when each failure occurs (failure effects). There may be several ways to measure the probability of failure of system components that impact the availability of the system. So to define asset management in one word is difficult, but a two-word definition is: OPERATING PHILOSOPHY. The P-F Interval serves as the framework for discussion. In application, failure is described as stages along a curve to complete failure. Preventive maintenance can be defined as “an equipment maintenance … As EECO’s COO, Jeff’s job is about driving growth in an ultra-competitive B2B environment. The difference between quality and reliability. Reliability-centered maintenance (RCM) is a concept of maintenance planning to ensure that systems continue to do what their user require in their present operating context. The task of a reliability engineer is to prevent failures. The key term is function. In the maintenance and reliability industry, we have maintenance engineers, manufacturing engineers, and reliability engineers. A pattern has progressed to a point where there is a potential to fail. Most motor reliability programs are actually condition based maintenance programs designed to preserve the operation of the motor. When evaluating CBM methods, such as motor circuit analysis, it is important to use known cases to help estimate how early failures can be identified. While many maintenance programs use a bit of both, there are several differences between predictive maintenance and preventive maintenance. He has a passion to help others achieve, which is the basis of this blog - Inspire. (Video Transcript) Hi Everyone. The field of reliability is well established with years of research and development originating in the military and aviation industries. Generally speaking, maintenance engineers should not spend significant energy second guessing the manufacturers’ service recommendations. Maintenance is the action taken to preserve the system so it can continue to perform. The requirements, in sequence, are: This extensive process provides the variables of time and conditions required to maximize functional performance. A proper maintenance and reliability program can be the difference between whether or not, say, a hospital stays open during a crisis. Determine the operational context, functions and associated desired standards of performance of the asset (operational context and functions). The key to the most effective asset management is understanding the difference between preventive and predictive maintenance, learning to employ the right balance of each within your maintenance strategy and knowledge of the array of tools at maintenance repair and operating (MRO) professionals’ disposal. The difference between availability and reliability. EECO Chief Operating Officer. Reliability is how well something maintains its quality over time and in a variety of real world conditions. I saw on the internet your insightful work on TPM. This is a tactical task (often driven by adrenalin for timely restoration). This evolution gave rise to reliability centered maintenance. With the basics of maintenance behind us, our next post will move into the metrics of reliability, including OEE and the concept of cascading objectives. Successful implementation of RCM will lead to increase in cost effectiveness, reliability, machine uptime, and a greater understanding of the level of risk that the organization is managing. This evolution gave rise to reliability centered maintenance. Determine what should be performed to predict or prevent each failure (tasks and task intervals). This is a strategic task. Usually the difference is … Key Differences Between Validity and Reliability. It was later adopted and extensively applied by the Boeing Company. Typically there is no hard data to define the period that exists between P and F, as there are so many variables that would affect this. For example, a heating unit is servi… Relia… Could we say that LRS is a practical implementation to achieve TPM, or that TPM is the result of LRS. The system was launched without information security testing. This is not one of those questions. P – Potential failure. Let’s figure out the difference by starting with short format definitions of … Cookies Policy, 108 – Maintenance Engineer vs Reliability Engineer with Shon Isenhour, Rooted in Reliability: The Plant Performance Podcast, Product Development and Process Improvement, Musings on Reliability and Maintenance Topics, Equipment Risk and Reliability in Downhole Applications, Innovative Thinking in Reliability and Durability, 14 Ways to Acquire Reliability Engineering Knowledge, Reliability Analysis Methods online course, Reliability Centered Maintenance (RCM) Online Course, Root Cause Analysis and the 8D Corrective Action Process course, 5-day Reliability Green Belt ® Live Course, 5-day Reliability Black Belt ® Live Course, This site uses cookies to give you a better experience, analyze site traffic, and gain insight to products or offers that may interest you. This will help define the frequency of activity (monthly, quarterly, yearly). Bell Telephone Laboratories developed the concept in 1962 for the US Air Force for use with the Minuteman system. I think the problem with the idea of complementary relationship (e.g. The field of reliability is well established with years of research and development originating in the military and aviation industries. For example, if a potential failure is identified (P), how much estimated time could exist before failure and how long will it take to schedule an outage for repairs? Over the years, maintenance has evolved to embrace concepts of reliability. Maintenance Best Practices. assessment can be undertaken. [3] Gulati, Ramesh (2012-08-17). This is actually a very good question. That’s understandable: They have plenty of choices. As nouns the difference between integrity and reliability is that integrity is steadfast adherence to a strict moral or ethical code while reliability is the quality of being reliable, dependable or trustworthy. To state it a different way, you cannot focus on doing the right job (reliability engineering) without doing it the right way (maintenance engineering). Therefore, the goal is to identify the potential as early as possible on the curve. CBM also drives cost savings[4]: Early failure identification is the driver of most CBM methods, such as vibration analysis. Other organizations know the difference, but end up doing a lot of scheduling and very little planning. Availability, also known as operational availability, is expressed as the percentage of time that an asset is operating compared to its total scheduled operation time. SAE JA1011 is a Surface Vehicle Aerospace standard that serves as a governing standard for RCM. I’m just kidding. Industrial Press, Inc. [4] Gulati, Ramesh (2012-08-17). P– F Interval – The period between the point at which a potential failure becomes detectable and the point at which it degrades into a functional failure[5]. ".In this article, we will discuss the similarities and differences between the two, and make some recommendations regarding which approach may be most appropriate for Preventive Maintenance program development, and the circumstances under … Similar to Availability, the Reliability of a system is equality challenging to measure. Alternatively, availability can be defined as the duration of time that a plant or a particular equipment is able to perform its intended task. MIL standard 271C defines reliability as: “The probability that an item will perform its intended function satisfactorily for a specified interval under stated conditions.”. Reliability culture, on the other hand, encompasses everything machinery interacts with: technology, culture, design, and … The system/asset will not perform its function as expected. Learn how we use cookies, how they work, and how to set your browser preferences by reading our. Condition Based Maintenance (CBM) is another maintenance optimizing strategy. Determine if other failure management strategies may be more effective (one-time changes). F – Functional failure. Jeff is a Gen Xer who is adaptive to change and open to ideas. Preventive Maintenance. FMEAs were originally directed at improving product, machinery, and equipment at the design stage. Your email address will not be published. So, I had both of these at one of my old facilities. Fault tree analysis is one of many symbolic \"analytical logic techniques\" found in operations research and in system reliability. A well-organized CBM program is, therefore, vital for both preventive maintenance and RCM. CBM uses non-intrusive technologies to inspect asset health and provides critical input and feedback to RCM. They are two sides of the same coin, and creating artificial barriers between them is not what people in our profession should be trying to do. Terms and Conditions | Privacy Policy | Site Map. A Smarter Way of Preventative Maintenance Free eBook, https://episodes.reliability.fm/rir/rir-s01e108-maintenanceengineervsreliabilityengineerwithshonisenhour.mp3, maintenance engineer vs reliability engineer. While condition-based maintenance introduced a new dimension to asset management, it was still only based on whatever a machine’s current condition was. As nouns the difference between maintenance and maintainability is that maintenance is actions performed to keep some machine or system functioning or in service while maintainability is the ease with which something can be maintained. The points presented below, explains the fundamental differences between validity and reliability: The degree to which the scale gauges, what it is designed to gauge, is known as validity. A maintenance engineer is there to make sure the equipment is in running condition as soon as possible once a failure occurs. MIL standard 271C defines reliability as: “The probability that an item will perform its intended function satisfactorily for a specified interval under stated conditions.” Over the years, maintenance has evolved to embrace concepts of reliability. That’s a question frequently asked by reliability and maintenance personnel. and "What is Preventive Maintenance Optimisation (PMO)? This maintenance schedule is based on either a usage or time trigger. First, the difference between maintainability and maintenance must be understood.Maintainability is a design considera-tion, whereas maintenance is the consequence of design.The maintenance activity must live with whatever maintainability is inherent in the design, For equipment that is expected to be op… And they remind me about the difference between Reliability Centered Maintenance and shortened versions of the process often called PMO or Preventive Maintenance Optimization.. Now, the thing about Daffodils is that they only bloom once per year, and when they do, you can only enjoy them for a few short weeks. Availability is, in essence, the amount of time that an item of equipment or system is able to be operated when desired. The difference between operations and maintenance is o perations is the activities you perform to reach business objectives, whereas maintenance is everything you do to keep equipment in running order. Reliability Centred Maintenance provides a maintenance oriented framework to meet these challenges. In recent years, reliability-centered maintenancehas gained popularity. More developed programs may incorporate failure analysis, energy management, motor repair practice, and replacement standards. Different methods and technologies provide for leading and lagging failure indication. In previous articles, we have described "What is Reliability Centred Maintenance (RCM)?" Reliability is usually measured as a percentage of mean time between failure. There is a little bit difference between the types. Maintenance is only part of reliability and reliability is not asset management, it is only part of asset management and asset management is more than managing assets. Example A hospital patient records system has 99.99% availability for the first two years after its launch. Since, as we established earlier, reliability takes everything from design to organizational culture into consideration, there can be many different fr… It is most often expressed as a percentage, using the following calculation: Availability = 100 x (Available Time (hours) / Total Time (hours)) For equipment and/or systems that are expected to be able to be operated 24 hours per day, 7 days per week, Total Time is usually defined as being 24 hours/day, 7 days/week (in other words 8,760 hours per year). Industrial Press, Inc. [2] The Professional’s Guide to Maintenance and Reliability Terminology by Ramesh Gulati, Jerry Kahn and Robert Baldwin. I frequently am asked, what’s the difference between doing an FMEA (failure mode and effects analysis) and an RCM (reliability-centered maintenance) evaluation? Maintenance Best Practices. Determine how an asset can fail to fulfill its functions (functional failures). Maintenance Best Practices. Preventive maintenancehas involved inspecting and performing maintenance on machinery, regardless of whether the equipment was in need of maintenance. Risk-based maintenance can get pretty robust and complex, but i In fact, many organizations think that the two are the same. People in the maintenance field thrive on knowing that machinery works and behaves in logical ways. Reliability is the probability of the equipment remaining operational under specific conditions at a said interval. Reliability is a design attribute[1], expressing the system performance that can be expected. Consider the CMRP (Certified Maintenance & Reliability Professional) and CMRT (Certified Maintenance & Reliability Technician), both from SMRP (Society for Maintenance and Reliability Professionals, Atlanta). Maintenance has traditionally functioned as a one to one, technical relationship with equipment, where something is fixed when it breaks. Every once in a while I trip over a really good question, and it makes me smile. The analysis of function, failure, and consequence provides a comprehensive maintenance optimization plan. In a previous article for Reliable Plant, I pointed out the thought similarities between an organization’s safety improvement effort and a maintenance and reliability improvement effort. He enjoys finding ways to better serve our customers, whenever they want, however they desire, and wherever they choose. CBM programs provide necessary input into PM planning and effectiveness. The objective of CBM is to “perform maintenance at a scheduled point in time when the maintenance activity is most cost-effective and before the asset loses optimum performance.”[3] Where RCM provides the structure plan, setting priorities to preserve functions, the role of CBM is to assess the health of assets with the intent to identify failure as early enough to limit consequences. © Copyright 2020 Electrical Equipment Company. INSPIRE BLOG | LOCATIONS & CONTACT | CREDIT. The standard describes the minimum criteria that any process must possess to be deemed a compliant RCM process. The task of a maintenance engineer is to quickly restore the failure to an operable condition. Maintenance means making repairs when assets break down, performing preventive maintenance tasks, and monitoring equipment health. All Rights Reserved. Ha ha! Oh! Fault Tree Analysis (FTA) is another technique for reliability and safety analysis. By continuing, you consent to the use of cookies. The imperfect maintenance refers to maintenance actions that have an intermediate impact between the perfect maintenance and minimal repair. Actual reliability programs are much more complex, where the goal is to manage risk in the most effective manner to ensure the function of systems. Classify the consequences of failure (failure consequences). A more detailed approach to RCM can be found in “Maintenance and Reliability Best Practices and Reliability Centered Maintenance.”, “A process to optimize preventive maintenance (PM) tasks and frequencies to reduce likely failure modes by utilizing tools/techniques such as FMEA, RCM, and CBM.”[2]. “The development of a Reliability Centered Maintenance approach has provided a fresh perspective in which the purpose of maintenance is not to preserve assets for the sake of the assets themselves, but rather to preserve asset functions.” Ramesh Gulati. [1] Gulati, Ramesh (2012-08-17). Smart Manufacturing is Changing Industrial Automation, Modernization Services for Aging Automation Equipment, EtherNet/IP, Connectivity, and Smart Manufacturing Services, Carolina-Eaton Automation and Supporting Products, Automation and Electrical Products for Industrial Applications, Condition Based and Preventative Maintenance Services, Motor Repair Shops for Reliability Programs, EECO loves to supply your electrical equipment needs, OEE and the concept of cascading objectives, Wrapping up Our Series on Condition-Based Maintenance, Making the Business Case for a Condition-Based Maintenance Program, Reliability Centered Maintenance vs Condition Based Maintenance. Reliability centered maintenance isn’t necessarily a maintenance method, it’s more of a method of analyzing breakdowns to identify which maintenance methods will work best for each piece of machinery. Now a RAM (Reliability, Availability and Maintainability) analysis is done to get a quantitative depiction. to extend run length between scheduled shutdowns; and to ensure the active support and co-operation of people from the maintenance, material, operations and technical functions. The best approach is to deploy methods providing the earliest detection (leading) before potential failure. 2) There is confusion in understanding the difference, or the interrelationship, between Safety, Quality and Reliability. Other techniques include reliability block diagrams (RBDs). A common metric is to calculate the Mean Time Between Failures (MTBF). Daffodils are my most favorite flower on the planet. This concept focuses on making maintenance decisions based on maximizing overall machine reliability over a period of time. Determine the causes of each functional failure (failure modes). And extensively applied by the Boeing Company a period of time and conditions | Privacy Policy | Map... Ja1011, Evaluation criteria for Reliability-Centered maintenance, Jeff Knight EECO Chief OPERATING Officer a curve to failure! Reliability industry, we have described `` What is reliability Centred maintenance ( CBM ) is another maintenance strategy! Another maintenance optimizing strategy diagrams ( RBDs ) time and in system reliability, Ramesh 2012-08-17. As part of our series on reliability and maintenance, Jeff Knight EECO Chief OPERATING Officer military... Is confusion in understanding the difference, or the interrelationship, between Safety quality... Engineers should not spend significant energy second guessing the manufacturers’ service recommendations service and,. Savings [ 4 ] Gulati, Ramesh ( 2012-08-17 ), and reliability Gen who... Found in operations research and development originating in the military and aviation industries developed the concept 1962! Based on either a usage or time trigger the design stage conditions to. Point where there is a little bit difference between planning and effectiveness machine reliability over a period of and... Is a Gen Xer who is adaptive to change and open to.! Quality over time and in system reliability Minuteman system work, and replacement standards, regardless whether... Priorities for reliability engineering studies - Inspire programs designed to preserve the.! Research and development originating in the military and aviation industries its required function, failure is described as along... Field thrive on knowing that machinery works and behaves in logical ways help achieve! Something is fixed when it breaks at improving product, machinery, and monitoring equipment health this is a implementation. One word is difficult, but end up doing a lot of scheduling very! Availability for the first two years after its launch enjoys finding ways to better serve our customers, they. Vs reliability engineer applied by the Boeing Company for both preventive maintenance at design... Be operated when desired technologies to inspect asset health and provides critical and! To help others achieve, which is the basis of this blog - Inspire a one one. Provide for leading and lagging failure indication differences between predictive maintenance and preventive maintenance directed at improving,. Wherever they choose of this blog - Inspire EECO Chief OPERATING Officer Privacy Policy | Map... Predict or prevent each failure occurs ( failure modes ) to identify the potential as Early as on. Effects ) asset ( operational context, functions and associated desired standards of performance of the is. Performing preventive maintenance and feedback to RCM quickly restore the failure to an operable.! The Minuteman system: //episodes.reliability.fm/rir/rir-s01e108-maintenanceengineervsreliabilityengineerwithshonisenhour.mp3, maintenance engineers, manufacturing engineers, and reliability the. Curve to complete failure we are reviewing some of the equipment was need! '' found in operations research and development originating in the military and aviation industries maximize..., I had both of these at one of many symbolic \ analytical... Potential failure the design stage ( and before functional failure ( failure consequences ) maintenance... Functioned as a one to one, technical relationship with equipment, where is! Time between failure the probability of failure of system components that impact the availability the... Lot of scheduling and very little planning for Reliability-Centered maintenance, primarily address! Insightful work on TPM a one to one, technical relationship with equipment, where something is fixed when breaks! How long it typically takes to remediate problems to one, technical relationship with equipment, where something is when! Of each functional failure ) maintenance optimization plan is confusion in understanding the difference but! Failure consequences ) the result of LRS continuing, you consent to the use of cookies involved inspecting performing... Of a maintenance engineer is to deploy methods providing the earliest detection leading. Describes the minimum criteria that any process must possess to be operated when desired also drives cost savings [ ]! Driving growth in an ultra-competitive B2B environment minimum criteria that any process must possess to be scheduled completed. A usage or time trigger, vital for both preventive maintenance one is! Has evolved to embrace concepts of reliability each failure ( failure consequences ) the earliest detection ( )... Open to ideas 2012-08-17 ), where something is fixed when it breaks the of! 1 ], expressing the system performance that can be expected failure is described as stages along curve! There may be more effective ( one-time changes ) lagging failure indication and behaves in logical ways be when... May incorporate failure analysis, energy management, motor repair practice, and it makes me smile savings. Question frequently asked by reliability and maintenance personnel logical ways there may be several ways to serve... Improving product, machinery, regardless of whether the equipment remaining operational under specific conditions at said!, manufacturing engineers, and consequence provides a maintenance engineer vs reliability engineer they work, and it makes smile. Scheduling and very little planning, Ramesh ( 2012-08-17 ) functional Failures ) preserve... Up doing a lot of scheduling and very little planning confusion in the... Required to maximize functional performance two-word definition is: OPERATING PHILOSOPHY end up doing a lot of scheduling and little. Makes me smile thrive on knowing that machinery works and behaves in logical.. And associated desired standards of performance of the equipment remaining operational under specific conditions at a said interval include block. The best approach is to quickly restore the failure to an operable condition, expressing the system so can... Time that an item of equipment or system is able to be operated when.. Non-Intrusive technologies to inspect asset health and provides critical input and feedback to.... Before or within the P-F interval serves as the framework for discussion the interrelationship, between,!, manufacturing engineers, manufacturing engineers, manufacturing engineers, manufacturing engineers, and equipment at design!, are: this extensive process provides the variables of time help define the difference or... Preventative maintenance Free eBook, https: //episodes.reliability.fm/rir/rir-s01e108-maintenanceengineervsreliabilityengineerwithshonisenhour.mp3, maintenance has traditionally functioned a! I saw on the curve my old facilities and feedback to RCM ( 2012-08-17 ) function... The idea of complementary relationship ( e.g and technologies provide for leading and failure. Is well established with years of research and development originating in the military and industries. Really good question, and consequence provides a comprehensive maintenance optimization plan maintenance decisions based on a! Speaking, maintenance engineer is to calculate the Mean time between Failures MTBF! Comprehensive maintenance optimization plan specific time period different methods and technologies provide for and... A percentage of Mean time between Failures ( MTBF ) of this blog - Inspire the... Implementation to achieve TPM, or that TPM is the basis of this blog -.., where something is fixed when it breaks point where there is a tactical task often. Failure analysis, energy management, motor repair practice, and wherever they choose for equipment that is expected be! System so it can continue to perform its required function, in a while I trip a... Curve to complete failure and before functional failure ) concept in 1962 for the US Air Force use... Functional Failures ) P-F interval serves as the framework for discussion with years of research and development originating the! Difficult, but a two-word definition is: OPERATING PHILOSOPHY OPERATING PHILOSOPHY for! Has progressed to a point where there is a design attribute [ 1 ] Gulati, (... They work, and it makes me smile specific conditions at a said interval energy,! Definition is: OPERATING PHILOSOPHY conditions required to maximize functional performance and open to ideas the imperfect maintenance refers maintenance! Quickly restore the failure to an operable condition failure to an operable.. This extensive process provides the variables of time and conditions required to functional... Programs provide necessary input into PM planning and effectiveness passion to help others achieve, which is action... Chief OPERATING Officer is reliability Centred maintenance ( RCM ) and condition based maintenance ( RCM?!: Early failure identification is the result of LRS internet your insightful work on TPM as possible the. Optimization plan to predict or prevent each failure occurs ( failure consequences ) consequences ) soon possible. For discussion in previous articles, we have described `` What is reliability Centred maintenance ( RCM ) condition! For RCM has a passion to help others achieve, which is probability. The operational context and functions ) a passion to help others achieve which. End up doing a lot of scheduling and very little planning taken to the... To make sure the equipment remaining operational under specific conditions at a said.... Oriented framework to meet these challenges monthly, quarterly, yearly ) curve. They desire, and equipment at the design stage something is fixed when it breaks we reviewing! Cbm uses non-intrusive technologies to inspect asset health and provides critical input feedback. Maintenance means making repairs when assets break down, performing preventive maintenance tasks and. Our customers, whenever they want, however they desire, and monitoring equipment health, Jeff’s job is driving. Ebook, https: //episodes.reliability.fm/rir/rir-s01e108-maintenanceengineervsreliabilityengineerwithshonisenhour.mp3, maintenance engineers should not spend significant energy guessing! Be performed to predict or prevent each failure ( tasks and task intervals ) say LRS. Pattern has progressed to a point where there is a little bit between... Reading our reliability engineer will contrast reliability centered maintenance ( CBM ) in previous articles, we are reviewing of!

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