Preventive maintenance


Preventive maintenance

Preventive maintenance (PM) has the following meanings:

  1. The care and servicing by personnel for the purpose of maintaining equipment and facilities in satisfactory operating condition by providing for systematic inspection, detection, and correction of incipient failures either before they occur or before they develop into major defects.
  2. Maintenance, including tests, measurements, adjustments, and parts replacement, performed specifically to prevent faults from occurring.

Contents

Subgroups

Preventive maintenance can be described as maintenance of equipment or systems before fault occurs. It can be divided into two subgroups:

The main difference of subgroups is determination of maintenance time, or determination of moment when maintenance should be performed.

While preventive maintenance is generally considered to be worthwhile, there are risks such as equipment failure or human error involved when performing preventive maintenance, just as in any maintenance operation. Preventive maintenance as scheduled overhaul or scheduled replacement provides two of the three proactive failure management policies available to the maintenance engineer. Common methods of determining what Preventive (or other) failure management policies should be applied are; OEM recommendations, requirements of codes and legislation within a jurisdiction, what an "expert" thinks ought to be done, or the maintenance that's already done to similar equipment, and most important measured values and performance indications.

To make it simple:

  • Preventive maintenance is conducted to keep equipment working and/or extend the life of the equipment.
  • Corrective maintenance, sometimes called "repair," is conducted to get equipment working again.

The primary goal of maintenance is to avoid or mitigate the consequences of failure of equipment. This may be by preventing the failure before it actually occurs which Planned Maintenance and Condition Based Maintenance help to achieve. It is designed to preserve and restore equipment reliability by replacing worn components before they actually fail. Preventive maintenance activities include partial or complete overhauls at specified periods, oil changes, lubrication and so on. In addition, workers can record equipment deterioration so they know to replace or repair worn parts before they cause system failure. The ideal preventive maintenance program would prevent all equipment failure before it occurs.

There is a controversy of sorts regarding the propriety of the usage “preventative.”[1][2][3] The consensus of internet entries concerning the respective usages seems to indicate that “preventive” is the preferred term.[4]

Difference Between Preventive and Predictive Maintenance

Predictive maintenance tends to include direct measurement of the item. Example, an infrared picture of a circuit board to determine hot spots.

While Preventive Maintenance - evaluation of particles in suspension in a lubricant, sound and vibration analysis of a machine.

It is easy to describe the difference between preventive vs predictive maintenance.

Look at the below example.

You have bought a incandescent light bulb. The manufacturing company is telling you that the life span of the bulb is 3 years. So just before expiring 3 years you have decided to replace the bulb with a new one and scheduled for a maintenance. This is called preventive maintenance.

However, everyday you have the opportunity to observe the bulb operation. After two years, the bulb starts flickering. So you are predicting at that time that the bulb is going to fail very soon and deciding to change with a new one and scheduled for a just-in time maintenance. This is called predictive maintenance.

See also

References

  1. ^ Michael Quinion, PREVENTATIVE OR PREVENTIVE, World Wide Words.
  2. ^ What term is more correct preventive or preventative?, Answers.com.
  3. ^ OIT Style Guide: How should I write that word? An A to Z, Office of Information Technology.
  4. ^ Bobby Joseph, Letter to the Editor: What's the good word—preventive or preventative?, International Journal of Epidemiology, Vol. 30, N. 6, p. 1498.]

External links


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Look at other dictionaries:

  • preventive maintenance — profilaktinė techninė priežiūra statusas T sritis Gynyba apibrėžtis Sisteminga ir (ar) nustatyta priežiūra, kuri mažina gedimų tikimybę. atitikmenys: angl. preventive maintenance pranc. maintenance préventive ryšiai: dar žiūrėk – atkuriamasis… …   NATO terminų aiškinamasis žodynas

  • preventive maintenance — The care and servicing by personnel for the purpose of maintaining equipment and facilities in satisfactory operating condition by providing for systematic inspection, detection, and correction of incipient failures either before they occur or… …   Aviation dictionary

  • preventive maintenance —    Maintenance, such as periodic inspection, cleaning, and adjustment intended to prevent system malfunctions …   IT glossary of terms, acronyms and abbreviations

  • preventive maintenance — regular maintenance and repairs in order to prevent serious deterioration …   English contemporary dictionary

  • preventive maintenance — The care and servicing by personnel for the purpose of maintaining equipment and facilities in satisfactory operating condition by providing for systematic inspection, detection, and correction of incipient failures either before they occur or… …   Military dictionary

  • Preventive Maintenance Checks and Services — In the United States Military, Preventive Maintenance Checks and Services, or PMCS, are the checks, service and maintenance performed before, during, and after any type of movement, or before the use of all types of military equipment. Every… …   Wikipedia

  • preventive maintenance of heating and hot water systems — pastato šildymo ir karšto vandens sistemų profilaktinė techninė priežiūra statusas Aprobuotas sritis šiluma apibrėžtis Nustatytais laiko tarpais atliekami pastato šildymo ir karšto vandens sistemų patikrinimai, apžiūros, smulkių trūkumų ir gedimų …   Lithuanian dictionary (lietuvių žodynas)

  • Preventive maintenance program for heating and/or cooling equipment —   A HVAC conservation feature consisting of a program of routine inspection and service for the heating and/or cooling equipment. The inspection is performed on a regular basis, even if there are no apparent problems.   U.S. Dept. of Energy,… …   Energy terms

  • PS, The Preventive Maintenance Monthly — is a monthly United States Army magazine published since 1952 to illustrate proper preventive maintenance methods with comic book style art. Legendary comic book artist Will Eisner was the publication s artistic director from its inception… …   Wikipedia

  • предупреждающее техническое обслуживание и ремонт ( preventive maintenance ) — 3.1.8. предупреждающее техническое обслуживание и ремонт ( preventive maintenance ): Плановое действие, предусмотренное при проектировании процесса производства для устранения причин отказа оборудования и незапланированных остановок производства …   Словарь-справочник терминов нормативно-технической документации


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