Key Terms |
Definition |
Asphalt |
A dark-brown-to-black cement-like material containing bitumens as the predominant constituent
obtained by petroleum processing; used primarily for road construction. It includes crude
asphalt as well as the following finished products: cements, fluxes, the asphalt content of
emulsions (exclusive of water), and petroleum distillates blended with asphalt to make
cutback asphalts. Note: The conversion factor for asphalt is 5.5 barrels per short ton.
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Barrel |
A unit of volume equal to 42 U.S. gallons.
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Blending Plant |
A facility which has no refining capability but is either capable of producing finished
motor gasoline through mechanical blending or blends oxygenates with motor gasoline.
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Butane (C4H10) |
A normally gaseous straight-chain or branch-chain hydrocarbon extracted from natural gas or refinery
gas streams. It includes isobutane and normal butane and is designated in ASTM Specification
D1835 and Gas Processors Association Specifications for commercial butane.
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Butylene (C4H8) |
An olefinic hydrocarbon recovered from refinery processes.
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Catalyst Coke |
In many catalytic operations (e.g., catalytic cracking) carbon is deposited on the catalyst,
thus deactivating the catalyst. The catalyst is reactivated by burning off the carbon,
which is used as a fuel in the refining process. This carbon or coke is not recoverable in a
concentrated form.
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Commercial Kerosene-Type Jet Fuel |
Kerosene-type jet fuel intended for use in commercial aircraft.
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Conventional Gasoline |
Finished motor gasoline not included in the oxygenated or reformulated gasoline categories.
Excludes reformulated gasoline blendstock for oxygenate blending (RBOB)
as well as other blendstock.
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Distillate Fuel Oil |
A general classification for one of the petroleum fractions produced in conventional distillation
operations. It includes diesel fuels and fuel oils. Products known as No. 1, No. 2, and
No. 4 diesel fuel are used in on-highway diesel engines, such as those in trucks and automobiles,
as well as off-highway engines, such as those in railroad locomotives and agricultural machinery.
Products known as No. 1, No. 2, and No. 4 fuel oils are used primarily for space heating and
electric power generation.
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Ethane (C2H6) |
A normally gaseous straight-chain hydrocarbon. It is a colorless paraffinic gas that boils at
a temperature of -127.48º F. It is extracted from natural gas and refinery gas streams.
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Ethylene (C2H4) |
An olefinic hydrocarbon recovered from refinery processes or petrochemical processes.
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Finished Aviation Gasoline |
A complex mixture of relatively volatile hydrocarbons with or without small quantities of
additives, blended to form a fuel suitable for use in aviation reciprocating engines. Fuel
specifications are provided in ASTM Specification D 910 and Military Specification MIL-G-5572.
Note: Data on blending components are not counted in data on finished aviation gasoline.
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Finished Motor Gasoline |
A complex mixture of relatively volatile hydrocarbons with or without small quantities of
additives, blended to form a fuel suitable for use in spark-ignition engines. Motor gasoline,
as defined in ASTM Specification D 4814 or Federal Specification VV-G-1690C, is characterized
as having a boiling range of 122 to 158 degrees Fahrenheit at the 10 percent recovery point to
365 to 374 degrees Fahrenheit at the 90 percent recovery point. Motor Gasoline includes
conventional gasoline; all types of oxygenated gasoline, including gasohol; and
reformulated gasoline, but excludes aviation gasoline. Note: Volumetric data on blending
components, such as oxygenates, are not counted in data on finished motor gasoline until
the blending components are blended into the gasoline. Finished motor gasoline includes
all ethanol blended gasoline (e.g. E10, E85).
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Isobutane (C4H10) |
A normally gaseous branch-chain hydrocarbon. It is a colorless paraffinic gas that boils at a
temperature of 10.9º F. It is extracted from natural gas or refinery gas streams.
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Isobutylene (C4H8) |
An olefinic hydrocarbon recovered from refinery processes or petrochemical processes.
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Kerosene |
A light petroleum distillate that is used in space heaters, cook stoves, and water heaters
and is suitable for use as a light source when burned in wick-fed lamps. Kerosene has a
maximum distillation temperature of 400 degrees Fahrenheit at the 10-percent recovery point,
a final boiling point of 572 degrees Fahrenheit, and a minimum flash point of 100 degrees
Fahrenheit. Included are No. 1-K and No. 2-K, the two grades recognized by ASTM Specification
D 3699 as well as all other grades of kerosene called range or stove oil, which have properties
similar to those of No. 1 fuel oil. See Kerosene-Type Jet Fuel.
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Kerosene-Type Jet Fuel |
A kerosene-based product having a maximum distillation temperature of 400 degrees Fahrenheit at
the 10-percent recovery point and a final maximum boiling point of 572 degrees Fahrenheit
and meeting ASTM Specification D 1655 and Military Specifications MIL-T-5624P and MIL-T-83133D
(Grades JP-5 and JP-8). It is used for commercial
and military turbojet and turboprop aircraft engines.
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Liquefied Refinery Gases (LRG) |
Liquefied petroleum gases fractionated from refinery or still gases. Through compression
and/or refrigeration, they are retained in the liquid state. The reported categories are
ethane/ethylene, propane/propylene, normal butane/butylene, and isobutane/isobutylene.
Excludes still gas.
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Lubricants |
Substances used to reduce friction between bearing surfaces or as process materials
either incorporated into other materials used as processing aids in the manufacture of
other products, or used as carriers of other materials. Petroleum lubricants may be produced
either from distillates or residues. Lubricants include all grades of lubricating oils from
spindle oil to cylinder oil and those used in greases. |
Marketable Coke |
Those grades of coke produced in delayed or fluid cokers which may be recovered as relatively
pure carbon. This "green" coke may be sold as is or further purified by calcining.
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Military Kerosene-Type Jet Fuel |
Kerosene-type jet fuel intended for use in military aircraft.
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Miscellaneous Products |
Includes all finished products not classified elsewhere (e.g., petrolatum, lube refining
byproducts (aromatic extracts and tars), absorption oils, ram-jet fuel, petroleum rocket
fuels, synthetic natural gas feedstocks, and specialty oils).
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Naphtha |
A generic term applied to a petroleum fraction with an approximate boiling range between
122º and 400º F.
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Naphtha Less Than 401º F |
A naphtha with a boiling range of less than 401º F that is intended for use as a petrochemical feedstock.
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Naphtha-Type Jet Fuel |
A fuel in the heavy naphtha boiling range having an average gravity of 52.8 degrees API,
20 to 90 percent distillation temperatures of 290 degrees to 470 degrees Fahrenheit, and
meeting Military Specification MIL-T-5624L (Grade JP-4). It is used primarily for
military turbojet and turboprop aircraft engines because it has a lower freeze point
than other aviation fuels and meets engine requirements at high altitudes and speeds.
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Normal Butane (C4H10) |
A normally gaseous straight-chain hydrocarbon. It is a colorless paraffinic gas that boils
at a temperature of 31.1º F. It is extracted from natural gas or refinery gas streams.
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Other Oils Equal To or Greater Than 401º F |
Oils with a boiling range equal to or greater than 401º F that are intended for use as
a petrochemical feedstock. |
Petrochemical Feedstocks |
Chemical feedstocks derived from petroleum principally for the manufacture of chemicals,
synthetic rubber, and a variety of plastics. The categories reported are "Naphtha Less
Than 401º F" and "Other Oils Equal To or Greater Than 401º F."
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Petroleum Administration for Defense (PAD) Districts |
Geographic aggregations of the 50 States and the District of Columbia into five districts
by the Petroleum Administration for Defense in 1950. These districts were originally defined
during World War II for purposes of administering oil allocation.
Description and maps of PAD Districts and Refining Districts.
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Petroleum Coke |
A residue high in carbon content and low in hydrogen that is the final product of
thermal decomposition in the condensation process in cracking. This product is reported
as marketable coke or catalyst coke. The conversion is 5 barrels
(of 42 U.S. gallons each) per short ton. Coke from petroleum has a heating value of
6.024 million Btu per barrel.
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Petroleum Products |
Petroleum products are obtained from the processing of crude oil (including lease condensate),
natural gas, and other hydrocarbon compounds. Petroleum products include unfinished oils,
liquefied petroleum gases, pentanes plus, aviation gasoline, motor gasoline, naphtha-type jet
fuel, kerosene-type jet fuel, kerosene, distillate fuel oil, residual fuel oil, petrochemical
feedstocks, special naphthas, lubricants, waxes, petroleum coke, asphalt, road oil, still gas,
and miscellaneous products.
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Ppm |
Parts per million.
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Processing Gain |
The volumetric amount by which total output is greater than input for a given period of time.
This difference is due to the processing of crude oil into products which, in total, have a
lower specific gravity than the crude oil processed.
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Processing Loss |
The volumetric amount by which total refinery output is less than input for a given period of
time. This difference is due to the processing of crude oil into products which, in total,
have a higher specific gravity than the crude oil processed.
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Propane (C3H8) |
A normally gaseous straight-chain hydrocarbon. It is a colorless paraffinic gas that boils
at a temperature of -43.67o F. It is extracted from natural gas or refinery gas streams.
It includes all products designated in ASTM Specification D1835 and Gas Processors Association
Specifications for commercial propane and HD-5 propane.
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Propylene (C3H6) |
An olefinic hydrocarbon recovered from refinery processes or petrochemical processes.
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RBOB |
"Reformulated Gasoline Blendstock for Oxygenate Blending" is a motor gasoline blending
component which, when blended with a specified type and percentage of oxygenate, meets the
definition of reformulated gasoline.
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Refinery |
An installation that manufactures finished petroleum products from crude oil, unfinished oils,
natural gas liquids, other hydrocarbons, and oxygenates.
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Refinery Production |
Petroleum products produced at a refinery or blending plant. Published production of these
products equals refinery production minus refinery input. Negative production will occur
when the amount of a product produced during the month is less than the amount of that same
product that is reprocessed (input) or reclassified to become another product during the same
month. Refinery production of unfinished oils, and motor and aviation gasoline blending
components appear on a net basis under refinery input.
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Reformulated |
Finished motor gasoline formulated for use in motor vehicles, the composition and properties
of which meet the requirements of the reformulated gasoline regulations promulgated by the
U.S. Environmental Protection Agency under Section 211(k) of the Clean Air Act.
This category includes oxygenated fuels program reformulated gasoline (OPRG) but excludes
reformulated gasoline blendstock for oxygenate blending (RBOB).
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Reformulated (Blended with Alcohol) |
Reformulated gasoline blended with an alcohol component (e.g. fuel ethanol) at a
terminal or refinery to raise the oxygen content.
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Reformulated (Blended with Ether) |
Reformulated gasoline blended with an ether component (e.g. methyl tertiary butyl ether)
at a terminal or refinery to raise the oxygen content.
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Reformulated (Non-Oxygenated) |
Reformulated gasoline without added ether or alcohol components.
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Residual Fuel Oil |
A general classification for the heavier oils, known as No. 5 and No. 6 fuel oils, that remain
after the distillate fuel oils and lighter hydrocarbons are distilled away in refinery
operations. It conforms to ASTM Specifications D 396 and D 975 and Federal Specification
VV-F-815C. No. 5, a residual fuel oil of medium viscosity, is also known as Navy Special
and is defined in Military Specification MIL-F-859E, including Amendment 2 (NATO Symbol F-770).
It is used in steam-powered vessels in government service and inshore powerplants.
No. 6 fuel oil includes Bunker C fuel oil and is used for the production of electric power,
space heating, vessel bunkering, and various industrial purposes.
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Road Oil |
Any heavy petroleum oil, including residual asphaltic oil used as a dust pallative and surface
treatment on roads and highways. It is generally produced in six grades from 0, the most liquid,
to 5, the most viscous.
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Special Naphthas |
Oils with a boiling range equal to or greater than 401º F that are intended for use as
a petrochemical feedstock. |
Still Gas |
Any form or mixture of gases produced in refineries by distillation, cracking, reforming,
and other processes. The principal constituents are methane, ethane, ethylene, normal butane,
butylene, propane, propylene, etc. Still gas is used as a refinery fuel and a petrochemical
feedstock. The conversion factor is 6 million BTU's per fuel oil equivalent barrel.
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Sulfur |
A yellowish nonmetallic element, sometimes known as "brimstone." It is present at various
levels of concentration in many fossil fuels.
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Wax |
A solid or semi-solid material at 77 degrees Fahrenheit consisting of a mixture of
hydrocarbons obtained or derived from petroleum fractions, or through a Fischer-Tropsch
type process, in which the straight-chained paraffin series predominates. This
includes all marketable wax, whether crude or refined, with a congealing point
(ASTM D 938) between 80 (or 85) and 240 degrees Fahrenheit and a maximum oil content
(ASTM D 3235) of 50 weight percent.
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