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A liquid giving off inflammable vapors.



Related Terms

FLASH POINT

The 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.

VAPOR LOCK

A condition where liquid flow is impeded by vapor trapped in a liquid line.

CAVITATION

A process occurring within the impeller of a centrifugal pump when pressure at the inlet to the impeller falls below that of the vapor pressure of the liquid being pumped. The bubbles of vapor which are formed collapse with impulsive force in the higher pressure regions of the impeller. This effect can cause significant damage to the impeller surfaces and, furthermore, pumps may loose suction.

PEROXIDE

A compound formed by the chemical combination of cargo liquid or vapor with atmospheric oxygen or oxygen from another source. In some cases these compounds may be highly reactive or unstable and a potential hazard.

VAPORIZATION

The change from liquid or solid phase to the vapor phase.

NPSH

This is the abbreviation for Net Positive Suction Head. This is an expression used in cargo pumping calculations. It is the pressure at the pump inlet and is the combination of the liquid head plus the pressure in the vapor space.

VAPOR PRESSURE

Pressure of a confined vapor in equilibrium with its liquid at specified temperature thus, a measure of a liquid's volatility.

BOILING POINT

The temperature at which the saturated vapor pressure of a liquid is equal to the pressure on its surface (the boiling point varies with pressure). The boiling point at atmospheric pressure is the lowest temperature at which the saturated vapor pressure of a liquid is equal to the atmospheric pressure (when a liquid is in an open vessel).

BATCH RECTIFICATION

Batch distillation in which the boiled-off vapor is re-condensed into liquid form and refluxed back into the still to make contact with the rising vapors.

VOLATILITY

This property describes the degree and rate at which a liquid will vaporize under given conditions of temperature and pressure. When liquid stability changes, this property is often reduced in value.

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