Scheduled maintenance, definition

Contamination caused by lack of a definite routine maintenance schedule on all the fermentation equipment. 

All of the equipment listed in this section must be maintained properly, and a definite maintenance schedule must be established. For example, the integrity of the chemical protective suits must be verified on a 6-month schedule. A maintenance log must be kept in order to confirm that the maintenance program has been done on schedule. 

One of the most effective safety practices, as well as one highly conducive to productivity, is a definite scheduled program of preventive maintenance. Each item of equipment should be periodically removed from service, carefully inspected and calibrated, any faults or indications of deterioration repaired, and tagged with the date of review and the name of the maintenance person, if more than one technician could have been responsible. A permanent file or maintenance log on each major item of equipment is useful for identifying trends or weak components. 

Exposure to contaminants can damage respirator components, even after they have been cleaned and put in storage, due to permeation of chemicals into the materials of which they are made. An examination oftheunits should bemade each time they are worn and a carefulcheck made on a definite schedule. This is important foralltypes ofunits,but especially forthose which are intended to be used in unusually hazardous applications. Records should be kept of all maintenance. 

Involves the systematic replacement of components, according to a predetermined schedule. This means the replacement of components whose life span is known. It also includes systematic lubrication jobs as well as minor upkeep work. This definition avoids confusion between systematic checking or even continual checking to determine the state of the equipment (conditional preventive maintenance) and systematic preventive maintenance. 

Clinical engineering identifies life-support equipment in the AIMS database. The definition of life-support equipment adopted by clinical engineering is medical devices intended to sustain life and whose failure to perform its primary function, when used according to manufacturer s instructions and clinical protocol, is expected to result in imminent death in the absence of immediate intervention. The maintenance of life-support equipment receives the highest priority in the medical equipment management efforts. The inspection schedule compliance goal is 100%. 

For revealed failures the MDT consists of the active mean time to repair (MTTR) PLUS any logistic delays (e.g., travel, site access, spares procurement, administration). For unrevealed failures the MDT is related to the proof-test interval (T), PLUS the active MTTR, PLUS any logistic delays. The way in which failure is defined determines, to some extent, what is included in the down time. If the unavailability of a process is confined to failures while production is in progress then outage due to scheduled preventive maintenance is not included in the definition of failure. However, the definition of dormant failures of redundant units affects the overall unavailability (as calculated by the equations in the next Section). 

During service life, the operational usage might change beyond that assumed in the original design and definition of the maintenance schedule. 

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