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Preventive maintenance pdf

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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.


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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.

Calculate the steady- state probability that the system is down for preventive maintenance. This is concerned with restoring the failed item or equipment to its operational state. It is advisable to observe it at least once a month, lubricate it with suitable products to their characteristics. As time t becomes large, we get the following steady state equations from Equation Which is the maintenance that should be applied to each of the equipment that make up a particular plant? It usually provides the best average location of the sample data and is the 50th percentile of all values of corrective maintenance time.

Even in the simplest model Corrective Model , in which virtually the equipment is left on its own and we do not deal with it until a fault occurs. It is advisable to observe it at least once a month, lubricate it with suitable products to their characteristics.

Pdf preventive maintenance

Visual inspections virtually no cost money these inspections will be included in a range where we have to look at other nearby equipment, so it will not mean we have to allocate resources specifically for this function.

This inspection allows us to detect faults in an early stage and its resolution will generally be cheaper as soon as detected. Lubrication is always profitable. Although it does represent a cost lubricant and labour , it is generally so low that it is more than warranted, since a malfunction due to a lack of lubrication will always involve a greater expense than the corresponding to lubricant application.

With this remark, we can already define the various possible maintenance models. It is applied, as we will see, to equipments with the lowest level of criticality, whose faults are not a problem, economically or technically.

In this type of equipment is not profitable to devote more resources and efforts. It includes the activities of the previous model, and also this model carries out a series of tests that will determine a subsequent action.

If after testing we discovered an anomaly, we will schedule an intervention; on the contrary, if everything is correct, we will not act on the equipment.

This maintenance model is valid in equipment not to very used, or for equipment that despite being important in the production system the probability of failure is low. 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.

It is a model widely used in equipment of medium availability, of some importance in the production system whose failures cause some disruption. It is important to note that equipment subjected to a systematic maintenance model does not have to have all its tasks with a fixed schedule. Just a equipment with this model of maintenance can have systematic tasks that are carried out regardless of the time it have been operated or state of the elements on which it works.

It is the main difference with the previous two models in which to perform a maintenance task should be some sign of failure. An example of equipment subjected to this maintenance model is a discontinuous reactor, in which the tasks that must react are introduced at once, the reaction takes place, and then the reaction product is extracted before making a new load.

Regardless of this reactor is doubled or not, when operating should be reliable, so it is warranted a series of tasks regardless of whether any signs of failure have been arose.

TYPES OF MAINTENANCE

It is the most demanding and exhaustive model of them. It is applied to that equipment that under no circumstances may suffer a breakdown or malfunction. The reason for such high level of availability is generally high cost in production due to a fault. With a demand so high, there is no time to stop the equipment if the maintenance requires it corrective, preventive, systematic.

To maintain this equipment is necessary to use predictive maintenance techniques that allow us to know the status of the equipment when is working, and scheduled shutdowns, which supposes a complete overhaul, with a frequency usually annually or higher. This review will replace, in general, all parts subject to wear or failure probability over the years parts with a lifetime less than two years.

These reviews are prepared well in advance and not have to be exactly the same every year. Since in this model the corrective maintenance is not included, that is, the aim should be zero breakdowns on this equipment; usually there is no time to properly address the issues that occur, being desirable in many cases quick provisional repairs that will maintain the equipment working until the next overhaul.

Therefore, the Annual Overhaul must include the resolution of all those provisional repairs that have had to be made throughout the year. When designing the Maintenance Plan should be taken into account two important considerations affecting some equipment in particular. Firstly, some equipment are subjected to legal rules that regulate their maintenance, forcing them to perform certain activities with an established frequency.

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. 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.

Maintenance pdf preventive

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. Omdahl, R.

Pdf preventive maintenance

Engineering Design Handbook: Niebel, B. Blanchard, B.

Maintenance pdf preventive

Shooman, M. Levitt, J. Patton, J. Westerkemp, T. Wild, R. Download pdf.

Example For system success, at least one unit must operate normally. The system fails when both the units fail.

Repair or corrective maintenance begins as soon as a unit fails to return to its operating state. 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.

Types of Maintenance

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. 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. 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.