A period on each start-up during which air is introduced into the combustion chamber and associated flue passages in volume and manner as to completely replace the air or fuel air-mixture contained therein prior to an attempt to initiate combustion.


Related Terms

CALORIMETER

A device used to measure heat quantities, specifically, the BTU value of fuel oil.

WATER COLUMN

A vertical tubular member connected at its top and bottom to the steam and water space respectively to a boiler, to which the water gage, gage valves, high and low water alarms and fuel cutoff may be connected.

POLYFORMING

A noncatalytic, petroleum-refinery process charging C3 and C4 gases with naphtha or gas oil at high temperature to produce high-quality gasoline and fuel oil; mostly replaced by catalytic reforming; the prodTesting and Materials analysis of paraffins (P), olefins (O), naphthenes (N), and aromatics (A) in gasolines.

PETROLEUM PROCESSING

The recovery and processing of various usable fractions from the complex crude oils; usable fractions include gasoline, kerosine, diesel oil, fuel oil, and asphalt. Also known as petroleum refining.

PERFORMANCE NUMBER

One of a series of numbers (constituting the PN, or performancenumber, scale) used to convert fuel antiknock values in terms of a reference fuel into an index which is an indication of relative engine performance; used mostly to rate aviation gasolines with octane values greater than 100.

PENSKY-MARTENS CLOSED TESTER

Device to determine the American Society for Testing and Materials flash point of fuel oils and cutback asphalts and other viscous materials and suspensions of solids.

OVERDRIVE

An automobile engine device that lowers the gear ratio, thereby reducing fuel consumption.

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.

ODORIZE

To add an unpleasant odor as a safety measure to an odorless material such as fuel gas.

OCTANE REQUIREMENT

The fuel octane number needed for efficient operation (without knocking or spark retardation) of an internal combustion engine.

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