The ratio of the actual vacuum at the steam inlet to the maximum obtainable vacuum in a perfect condensing plant, i.e., it is the ratio of actual vacuum to ideal vacuum.

Related Terms

RETURN-STEAM CONDENSATE

That steam produced by a boiler which returns to the boiler after it has condensed.

FILTRATION (BETA) RATIO

The ratio of the number of particles greater than a given size in the influent fluid to the number of particles greater than the same size in the effluent fluid.

ADIABATIC EFFICIENCY

The ratio of actual work output of a heat engine to the ideal output.

BETA-RATIO (ß-RATIO)

The ratio of the number of particles greater than a given size in the influent fluid to the number of particles greater than the same size in the effluent fluid, under specified test conditions (see 'Multi-Pass Test').

BITUMEN

Also called asphalt or tar, bitumen is the brown or black viscous residue from the vacuum distillation of crude petroleum. It also occurs in nature as asphalt 'lakes' and 'tar sands'. It consists of high molecular weight hydrocarbons and minor amounts of sulfur and nitrogen compounds.

BULK MODULUS (OF ELASTICITY)

A ratio of normal stress to a change in volume. A term used in determining the compressibility of a fluid. Data for petroleum products can be found in the International Critical Tables.

AIR-FUEL RATIO

The ratio weight, or volume, of air to fuel.

SENSIBLE HEAT FACTOR

The ratio of sensible heat to total heat.

POISE

A measure of viscosity (absolute viscosity) numerically equal to the force required to move a plane surface of one square centimeter per second when the surfaces are separated by a layer of fluid one centimeter in thickness. It is the ratio of the shearing stress to the shear rate of a fluid and is expressed in dyne seconds per square centimeter (DYNE SEC/CM2); 1 centipoise equals .01 poise.

LIVE STEAM

Steam which has not performed any of the work for which it was generated.

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