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The Threshold Limit Value. It is the concentration of gases in air to which personnel may be exposed 8 hours per day or 40 hours per week throughout their working life without adverse effects. The basic TLV is a Time-Weighted Average (TWA). This may be supplemented by a TLV-STEL (Short-Term Exposure Limit) or TLV-C (Ceiling exposure limit) which should not be exceeded even instantaneously. TLV of typical gas carrier cargoes are below:
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Related Terms |
FLASH POINTThe lowest temperature at which a liquid gives off sufficient vapor to form a flammable mixture with air near the surface of the liquid. The flashpoint temperature is determined by laboratory testing in a prescribed apparatus. Establishes the danger point when transferring, pumping, and firing procedures are concerned. |
PHOTOECOLOGY
The application of air photography to ecology, integrated land resource studies, and forestry.
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PERMISSIBLE EXPOSURE LIMIT
The level of air contaminants that represents an acceptable exposure level as specified in standards set by a national government agency; generally expressed as 8-hour time-weighted average concentrations. Abbreviated PEL.
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PERCUSSION DRILL
A drilling machine usually using compressed air to drive a piston that delivers a series of impacts to the shank end of a drill rod or steel and attached bit.
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PACHUCA TANK
Air-agitated, solidliquid mixing vessel in which the air is injected into the bottom of a center draft tube; air and solids rise through the tube, with solids exiting the top of the tube and falling through the bulk of the liquid.
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OPEN-CYCLE GAS TURBINE
A gas turbine prime mover in which air is compressed in the compressor element, fuel is injected and burned in the combustor, and the hot products are expanded in the turbine element and exhausted to the atmosphere.
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NUTATOR
A mechanical or electrical device used to move a radar beam in a circular, conical, spiral, or other manner periodically to obtain greater air surveillance than could be obtained with a stationary beam.
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NOZZLE-MIX GAS BURNER
Aburnerinwhich injection nozzles mix air and fuel gas at the 374 burner tile. nozzle throat with the
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NEEDLE BLOW
A blow-molding technique in which air is injected into the plastic article through a hollow needle inserted in the parison.
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NATURAL-DRAFT COOLING TOWER
A cooling tower that depends upon natural convection of air flowing upward and in contact with the water to be cooled.
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