Means the period of time that a respirator, filter or sorbent or other respiratory equipment provides adequate protection to the wearer.
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SAFETY CONTROL
Device to stop unit, equipment or system if unsafe pressure and/or temperatures and/or dangerous conditions are reached.
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ACCELERATION
The time rate of change of velocity; i.e., the derivative of velocity; with respect to time.
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RUNNING TIME
Amount of time an unit, equipment or system is run per hour or per 24 hours.
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RUNNING TIME
Amount of time an unit, equipment or system is run per hour or per 24 hours.
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GROUP REPETITION INTERVAL
The specified time interval of a Loran C chain for all stations of the chain to transmit their pulse groups. For each chain a minimum group repetition interval (GRI) is selected of sufficient duration to provide time for each station to transmit its pulse group and additional time between each pulse group so that signals from two or more stations cannot overlap in time anywhere within the coverage area. The GRI is normally stated in terms of tens of microseconds; i.e., the GRI having a duration of 79,900 microseconds is stated as 7900.
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HARMONIC FUNCTION
Any real function that satisfies a certain equation. In its simplest form, as used in tide and tidal current predictions, it is a quantity that varies as the cosine of an angle that increases uniformly with time
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HOUR-GLASS EFFECT
A radarscope phenomenon which appears as a constriction or expansion of the display near the center of the plan position indicator, which can be caused by a nonlinear time base or the sweep plot starting on the radar indicator at the same instant as the transmission of the pulse. The phenomenon is most apparent when in narrow rivers or close to shore.
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FLOW RATE
The volume, mass, or weight of a fluid passing through any conductor per unit of time.
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DOGWATCH
A short, evening period of watch duty on a ship
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FILTER LIFE TEST
A type of filter capacity test in which a clogging contaminant is added to the influent of a filter, under specified test conditions, to produce a given rise in pressure drop across the filter or until a specified reduction of flow is reached. Filter life may be expressed as test time required to reach terminal conditions at a specified contaminant addition rate.
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