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Valves used simultaneously to isolate a specific section of a system for maintenance or inspection of that section.

Related Terms

BREAKDOWN MAINTENANCE

Maintenance performed after a machine has failed to return it to an operating state.

PREDICTIVE MAINTENANCE

A type of condition-based maintenance emphasizing early prediction of failure using non-destructive techniques such as vibration analysis, thermography, and wear debris analysis.

PROACTIVE MAINTENANCE

A type of condition-based maintenance emphasizing the routine detection and correction of root cause conditions that would otherwise lead to failure. Such root causes as high lubricant contaminant, alignment and balance are among the most critical.

PREVENTIVE MAINTENANCE

Maintenance performed according to a fixed schedule involving the routine repair and replacement of machine parts and components.

CONSTRUCTION UNIT

A vessel equipped to assist during offshore construction and maintenance work.

DECK SUPERVISOR

The person in charge of all evolutions and maintenance on deck; sometimes split into two groups: forward deck supervisor, aft deck supervisor.

DOCKYARD

A facility where ships or boats are built and repaired. Routinely used as a synonym for shipyard, although dockyard sometimes is associated more closely with a facility used for maintenance and basing activities, while shipyard sometimes is associated more closely with a facility used in construction.

KEEPER

A piece of magnetic material placed across the poles of a permanent magnet to assist in the maintenance of magnetic strength.

FEDERAL PROJECT DEPTH

The design dredging depth of a channel constructed by the Corps of Engineers, U.S. Army; the project depth may or may not be the goal of maintenance dredging after completion of the channel. For this reason federal project depth must not be confused with CONTROLLING DEPTH.

SULPHATE-CARBONATE RATIO

The proportion of sulphates to carbonates, or alkalinity expressed as carbonates, in boiler water. The proper maintenance of this ratio has been advocated as a means of inhibiting caustic embrittlement.
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