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Compound containing only carbon and hydrogen. Petroleum consists chiefly of hydrocarbons.

Related Terms

AIR

A substance containing by volume approximately 78 - 79% nitrogen; 20.95% oxygen, 0.94% argon, traces of carbon dioxide, helium, etc.

CARBON

A non-metallic element - No. 6 in the periodic table. Diamonds and graphite are pure forms of carbon. Carbon is a constituent of all organic compounds. It also occurs in combined form in many inorganic substances; i.e., carbon dioxide, limestone, etc.

GRAPHITE

A crystalline form of carbon having a laminar structure, which is used as a lubricant. It may be of natural or synthetic origin.

INSOLUBLES

Particles of carbon or agglomerates of carbon and other material. Indicates deposition or dispersant drop-out in an engine. Not serious in a compressor or gearbox unless there has been a rapid increase in these particles.

CATALYTIC CONVERTER

An integral part of vehicle emission control systems since 1975. Oxidizing converters remove hydrocarbons and carbon monoxide (CO) from exhaust gases, while reducing converters control nitrogen oxide (NOx) emissions. Both use noble metal (platinum, palladium or rhodium) catalysts that can be 'poisoned' by lead compounds in the fuel or lubricant.

CARBON DIOXIDE

Compound of carbon and oxygen (CO2) which is sometimes used as a refrigerant. Refrigerant number is R-744.

DE-CARBONATION

Refers to the removal of carbon dioxide from the boiler feedwater.

HYDROCARBONS

Organic compounds containing only hydrogen and carbon atoms in various combinations.

GLAND-SEALING STEAM

It is the low-pressure steam that is led to a sealing gland. The steam seals the gland, which may be either a carbon ring or labyrinth type against air at the vacuum end of the shaft.

ENGINE DEPOSITS

Hard or persistent accumulation of sludge, varnish and carbonaceous residues due to blow-by of unburned and partially burned fuel, or the partial breakdown of the crankcase lubricant. Water from the condensation of combustion products, carbon, residues from fuel or lubricating oil additives, dust and metal particles also contribute.
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