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The rating of a component or equipment which defines the substantially constant conditions which can be tolerated for an indefinite time without significant reduction of service life.



Related Terms

LIFE-CYCLE COST

A measurement of the total cost of using equipment over the entire time of service of the equipment; includes initial, opbreathing mixture supply system, air purification and filtering system, or carbon dioxide removal system; used in oceanographic submersibles and spacecraft.

DECOMPRESSION CHAMBER

  1. A steel chamber fitted with auxiliary equipment to raise its air pressure to a value two to six times atmospheric pressure; used to relieve a diver who has decompressed too quickly in ascending. 2. Such a chamber in which conditions of high atmospheric pressure can be simulated for experimental purposes.

MAINTAINABILITY

  1. The ability of equipment to meet operational objectives with a minimum expenditure of maintenance effort under operational environmental conditions in which scheduled and unscheduled maintenance is performed. 2. Quantitatively, the probability that an item will be restored to specified conditions within a given period of time when maintenance action is performed in accordance with prescribed procedures and resources.

DETENTION CHARGE

Charges levied on usage of equipment or ships exceeding free time period as stipulated in the contract or charter parter and the rules and conditions of those agreements.

AUTOMATIC CHECK-OUT SYSTEM

A system utilizing test equipment capable of automatically and simultaneously providing actions and information which will ultimately result in the efficient operation of tested equipment while keeping time to a minimum.

FIGURE OF MERIT

A performance rating that governs the choice of a device for a particular application; for example, the figure of merit of a magnetic amplifier is the ratio of usable power gain to the control time constant.

CSR

Continuous Service Rating

MAXIMUM PRODUCTION LIFE

The length of time that a cutting tool performs at cutting conditions of maximum tool efficiency.

COEFFICIENT OF RESTITUTION

The constant e, which is the ratio of the relative velocity of two elastic spheres after direct impact to that before impact; e can vary from 0 to 1, with 1 equivalent to an elastic collision and 0 equivalent to a perfectly elastic collision. Also known as restitution coefficient.

WET-BULB TEMPERATURE

The lowest temperature to which air can be cooled at any given time by evaporating water into it at constant pressure, when the heat required for evaporation is supplied by the cooling of the air. This temperature is indicated by a well-ventilated wet-bulb thermometer. See also FREE-AIR TEMPERATURE.

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