PDF | Purpose - The purpose of this paper is to provide comprehensive information on preventive maintenance (PM) planning and methods used in the industry. Project overview. ▫ Build preventive maintenance scheduler. ▫ Assess potential losses. ▫ Find frequency of failure. ▫ Determine optimal maintenance policy. labor cost required to repair the item, the cost of preventive maintenance to avoid nondestructive testing and measuring techniques, predictive maintenance.
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Preventive Maintenance. Principles. SPL Scott Couzens, LFM ' Scott Hiroshige, LFM ' Presentation for: Summer i. Erik Smith, LFM '03 – Intel. maintenance manager to monitor and schedule tasks aimed at preventive Defining the Systems and equipment requiring preventive maintenance. • Defining. Preventive Maintenance: Its mission is to maintain a level of certain service on equipment, programming the interventions of their vulnerabilities in the most.
The system-state space diagram is shown in Figure The numerals in boxes and circle denote system states. The model is subject to the following assumptions: A failed unit is repaired, but the failed system is never repaired. The unit times to failure and repair i. The unit mean time to failure and mean time to repair are hours and 10 hours, respectively. Calculate the system mean time to failure with and without the performance of corrective maintenance and comment on the end results.
Using the data values in Equation This means the performance of corrective maintenance or repair on a unit has helped increase system mean time to failure from hours to 2, hours. Identify and select of one or two impor- tant areas on which to concentrate the initial preventive maintenance effort. The main objective of this step is to obtain good results in areas that are highly visible.
The Powerful Impact of Preventive Maintenance (.PDF Download)
Establish the frequency of assignments and review the item or equipment records and conditions. The frequency depends on factors such as vendor recommendations, the experience of personnel familiar with the equipment or item under consideration, and recommendations from engineers.
Prepare the daily and periodic assignments in an effective manner and then get them approved. Expand the preventive maintenance program to other areas on the basis of experience gained from the pilot preventive maintenance projects.
This section presents two such measures taken from the published literature [2,4,8]. It is the average equipment downtime required to perform scheduled preventive maintenance.
TYPES OF MAINTENANCE
This section presents two such models [2,16,17]. Usually, inspec- tions are disruptive, but they reduce equipment downtime because they reduce failures.
This model is concerned with obtaining the optimum number of inspections per facility per unit of time. By differentiating Equation Inserting Equation Substituting the given data values into Equation The failed system is repaired. This model can predict items such as system availability, probability of system failure, and probability of the system being down for preventive maintenance. Using the Markov method and Figure As time t becomes large, we get the following steady state equations from Equation Calculate the steady- state probability that the system is down for preventive maintenance.
Inserting the above values into Equation Some of the drawbacks of performing preventive maintenance are [13,14]: Discuss major corrective maintenance downtime components.
Discuss strategies for reducing the system-level corrective maintenance time.
Calculate the system steady-state unavailability if the system failure and repair times are exponentially distributed. Discuss seven important elements of preventive maintenance. Discuss steps for developing an effective preventive maintenance program in a short period.
What are the advantages of performing preventive maintenance? McKenna, T. Dhillon, B.
What is preventive maintenance (PM)?
Omdahl, R. Engineering Design Handbook: Niebel, B. Blanchard, B. Shooman, M. Levitt, J. Patton, J. Westerkemp, T.
Download pdf. Remember me on this computer. Enter the email address you signed up with and we'll email you a reset link. Need an account? Click here to sign up. Help Center Find new research papers in: Condition Based Maintenance as a strategy therefore looks for physical evidence that a failure is occurring or is about to occur.
Thinking of CBM in this way shows its broader applications outside condition monitoring techniques often only associated with rotating equipment. The time range between P and F, commonly called the P-F interval, is the window of opportunity during which an inspection can possibly detect the imminent failure and give you time to address it.
It is important to realise that CBM as a maintenance strategy does not reduce the likelihood of a failure occurring through life-renewal, but instead is aimed at intervening before the failure occurs, on the premise that this is more economical and should have less of an impact on availability. In other words: condition monitoring does not fix machines and condition monitoring does not stop failures. Condition monitoring only lets you find problems before they become a failure.
A common rule of thumb is that the interval between CBM tasks should be one-half or one-third of the P-F interval.
With plenty of warning the rectification can be planned, materials and resources can be mobilised and breakdown prevented though production is still stopped for the maintenance duration.
When the P-F interval is only a few days the resulting organisational and workplace actions are much like a breakdown and the value of CBM is largely lost.
For CBM to be effective as a strategy, early intervention is essential.
This requires an efficient and effective process for data gathering, data analysis, decision making and finally intervention. For failure modes where the P-F interval shows a large variability, condition monitoring is not an effective strategy. I see Predictive Maintenance as an extension, a more advanced approach to CBM where we use potentially many process parameters gained from online sensors to determine if our equipment is moving away from stable operating conditions and is heading towards failure.
However, I do still believe that even the most advanced Predictive Maintenance approaches need to be underpinned by sound reliability principles and understanding. It is based on the assumption that the failure is acceptable i.
Apart from being the outcome of a deliberate Run to Failure strategy Corrective Maintenance is also the result of unplanned failures which were not avoided through preventive maintenance. A run to failure strategy can effectively be used for general area lighting, smart process instrumentation without trip functionality etc.
When opting for corrective maintenance as a strategy it is essential to ensure that the failure modes under consideration do not have the potential to become Emergency Maintenance.
You see, if you adopt run-to-failure for equipment that once it has failed must be restored immediately to have doomed your organisation to a reactive maintenance environment.This model includes a set of tasks we will perform no matter what is the condition of the equipment , also we will perform some measurements and tests to decide whether to carry out other tasks of greater magnitude, and finally, we will repair faults that arise.
Corrective maintenance times of electronic equipment with a good built-in test capability and rapid remove and replace maintenance concept often follow this distribution. Fail repair: It usually provides the best average location of the sample data and is the 50th percentile of all values of corrective maintenance time. A run to failure strategy can effectively be used for general area lighting, smart process instrumentation without trip functionality etc. This model can predict items such as system availability, probability of system failure, and probability of the system being down for preventive maintenance.
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