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Image Courtesy: GoogleMaintenance:-The definition of maintenance according to the Dictionary of International Trade (Global Negotiator) is:          The Actions (Repairing and replacing) necessary for keeping a piece of article in correct condition (or) taking steps to avoid something breakdown (Preventive Maintenance) and bringing back to precise operable conditions (Corrective Maintenance) to achieve its maximum useful life.  TYPES OF MAINTENANCEGenerally, the maintenance is distinguished into 4 types, which are differ by the nature of tasks we perform. They are1. Corrective Maintenance 2. Preventive Maintenance     (a) Periodic Maintenance (Time based maintenance — TBM)     (b) Predictive Maintenance            (i) Condition Monitoring3. Zero Hour Maintenance (Overhaul)4. Breakdown MaintenanceImage Source: Corrective Maintenance:          Whenever the machine is in breakdown, repair/Maintenance is required instantly. The set of activities designed to identify, isolate and rectify a defect so that the failed equipment or machine can be restored to proper working order.  The difficulties that are faced during operation are communicated to the maintenance department by the operators or users of the equipment. It improves the equipment and its components (parts) so that preventive maintenance can be done reliably. Equipment with design weak points ought to be redesigned to improve reliability or enhancing maintainability.2. Preventive Maintenance (PM):          Preventive maintenance refers to regular or daily maintenance (Equipment cleaning, Inspection, Lubrication and Re-tightening), performed to retain the healthy condition of system and prevent failure through the prevention of deterioration. It requires periodic examination or instrument condition diagnosis, to measure deterioration. This can serve as a scientific feature, that is, the device will be checked even if it does not provide any signals that contain the problem. It protects the device from unplanned downtime and costs due to sudden failure. Preventive management is very complicated, especially for companies with a lot of equipment. It is further divided into two types, they are periodic maintenance and predictive maintenance. As human life is extended by medicine, the instrument remediation is long lasting through preventive maintenance.2 (a). Periodic Maintenance (Time Based Maintenance – TBM):          The basic maintenance of apparatus created by the users of it. Time based maintenance carried out regularly according to predetermined schedule. Time based maintenance consists of periodically analyzing, servicing and cleaning equipment and replacing parts to prevent unexpected failure and process issues. It consists of a sequence of basic tasks (i.e., Data collection, visual inspections, cleaning, lubrication, re-tightening of bolts, etc…..,) for which no in-depth training is necessary. This type of maintenance relies on TPM (Total Productive Maintenance). 2 (b). Predictive Maintenance:          The service life of essential components is predicted based on inspection or analysis, in order to use the parts to the limit of their service life. Predictive maintenance is completely condition based maintenance compared to periodic maintenance. For this maintenance application, it is important to know the physical variables (Temperature, motion, vibration, power consumption, and so on) by measuring and analyzing statistics bout degradation. Which variation is indicative of problems that will be showing on the equipment. This maintenance is highly technical, requiring advanced technology resources and requires at times of mathematical, physical and/or technologies. 2 (b).(i) Condition Monitoring:          Condition monitoring is the method of figuring out the condition of machinery while in operation. Machine condition monitoring is very important as a result of it gives data regarding the health of the machine. You’ll use this data to notice warning signs early and facilitate your organization forestall unexpected outages, optimize machine performance, and reduce repair time and maintenance expenses. Condition monitoring not only helps to reduce the chances of catastrophic failure, however conjointly permits them to order component parts in advance, schedule workforce, and plan other repairs during the downtime. Typically Vibration, noise and temperature measurements are used as key signs of the state of machines. Successfully using this programme enables to stumble the faults early, and permits to repair of drawback parts prior to failure.The key to a succesful condition monitoring programme includes:1. Knowing what to listen for2. How to interpret it3. When to put this information to use   http://www.skf.com