The technical meaning of maintenance machine involves functional checks, servicing , repairing or replacing of necessary devices, equipment, machinery, building infrastructure, and supporting utilities in industrial, business, governmental, and residential installations. Over time, this has come to include multiple wordings that describe various cost-effective practices to keep equipment operational; these activities take place either before or after a failure.
Definitions
Often maintenance functions are referred to as Maintenance, repair and overhaul (MRO) and MRO is also used for http://https://www.youtube.com/watch?v=sZoZdpvJn6o operations.Over time, the terminology of maintenance and MRO has begun to become standardized. The United state of defense uses the following definitions:
Types
The marine and air transportation, offshore structures,industrial plant and facility management industries depend on maintenance ,repair and overhaul (MRO) including scheduled or preventive paint maintenance programmes to maintain and restore coatings applied to steel in environments subject to attack from erosion, corrosion and environmental pollution.
The basic types of maintenance falling under MRO include:
Preventive maintenance machine
C-130J Hercules preventive cleaning at Keesler Air Force Base, Mississippi after a period of operation over the Gulf of Mexico (salt and moisture which lead to active corrosion require regular cleaning)
Main objective of PM are:
- Enhance capital equipment productive life.
- Reduce critical equipment breakdown.
- Minimize production loss due to equipment failures.
Other terms and abbreviations related to PM are:
- scheduled maintenance
- planned maintenance, which may include scheduled downtime for equipment replacement
- planned preventive maintenance (PPM) is another name for PM
- breakdown maintenance: fixing things only when they break. This is also known as “a reactive maintenance strategy” and may involve “consequential damage.”
Planned maintenance machine
Planned preventive maintenance (PPM), more commonly referred to as simply planned maintenance (PM) or scheduled maintenance, is any variety of scheduled maintenance to an object or item of equipment. Specifically, planned maintenance is a scheduled service visit carried out by a competent and suitable agent, to ensure that an item of equipment is operating correctly and to therefore avoid any unscheduled breakdown and downtime
Predictive maintenance machine
Predictive maintenance techniques are designed to help determine the condition of in-service equipment in order to estimate when maintenance should be performed. This approach promises cost savings over routine or time-based preventive maintenance , because tasks are performed only when warranted. Thus, it is regarded as condition-based maintenance carried out as suggested by estimations of the degradation state of an item
Cndition-based maintenance machine
Condition-based maintenance (CBM), shortly described, is maintenance when need arises . Albeit chronologically much older, It is considered one section or practice inside the broader and newer predictive maintenance field, where new AI technologies and connectivity abilities are put to action and where the acronym CBM is more often used to describe ‘condition Based Monitoring’ rather than the maintenance itself. CBM maintenance is performed after one or more indicators show that equipment is going to fail or that equipment performance is deteriorating.
Despite its usefulness, there are several challenges to the use of CBM. First and most important of all, the initial cost of CBM can be high. It requires improved instrumentation of the equipment. Often the cost of sufficient instruments can be quite large, especially on equipment that is already installed. Wireless systems have reduced the initial cost. Therefore, it is important for the installer to decide the importance of the investment before adding CBM to all equipment. A result of this cost is that the first generation of CBM in the oil and gas industry has only focused on vibration in heavy rotating equipment.
Secondly, introducing CBM will invoke a major change in how maintenance is performed, and potentially to the whole maintenance organization in a company. Organizational changes are in general difficult.
measured data into actionable knowledge about the health of the equipment.
Value potential
As systems get more costly, and instrumentation and information systems tend to become cheaper and more reliable, CBM becomes an important tool for running a plant or factory in an optimal manner. Better operations will lead to lower production cost and lower use of resources. And lower use of resources may be one of the most important differentiators in a future where environmental issues become more important by the day.
It is Department of Defense policy that condition-based maintenance (CBM) be “implemented to improve maintenance agility and responsiveness, increase operational availability, and reduce life cycle total ownership costs”.
Advantages and disadvantages
CBM has some advantages over planned maintenance:
- Improved system reliability
- Decreased maintenance costs
- Decreased number of maintenance operations causes a reduction of human error influences
Its disadvantages are:
- High installation costs, for minor equipment items often more than the value of the equipment
- Unpredictable maintenance periods cause costs to be divided unequally
- Increased number of parts (the CBM installation itself) that need maintenance and checking.
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