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B-7
TERM DEFINITION
Btu See British Thermal Unit.
Btu Factor A numerical representation of the heating value of natural gas which may be
calculated or presented to indicate varying relationships (e.g., the number of
Btu contained in one standard cubic foot or the number of MMBtu contained in
one Mcf of gas. The factor for a given relationship will vary depending upon
whether the gas is “dry” or “saturated”.
Btu Method A method of allocating costs between different operations or between different
products based upon the heat content of products produced in the various
operations or of the various produced products.
Btu per Cubic Foot A measure of the heat available or released when one cubic foot of gas is
burned.
Btu, Dry Heating value contained in cubic foot of natural gas measured and calculated
free of moisture content. Contractually, dry may be defined as less than or
equal to seven pounds of water per Mcf.
Btu, Saturated The number of Btu’s contained in a cubic foot of natural gas fully saturated with
water under actual delivery pressure, temperature and gravity conditions. See
BTU, DRY.
Btu/CV Used to express the heating content of gas. See British Thermal Units or
Calorific Value.
BtuMMI Refers to the interface program or software that operates the Btu Analyzer.
Buffer (1) A temporary storage device used to compensate for a difference in data rate
and data flow between two devices (typically a computer and a printer); also
called a spooler; (2) An amplifier to increase the drive capability, current or
distance, of an analog or digital signal.
Burst Pressure The maximum pressure applied to a transducer sensing element or case
without causing leakage.
BUS A data path shared by many devices (e.g., multipoint line) with one or more
conductors for transmitting signals, data, or power.
Bus Master A type of controller with the ability to read and write to devices on the computer
bus.
Busbar A heavy, rigid conductor used for high voltage feeders.
Butane (C4H10) A saturated hydrocarbon (Alkane) with four carbon atoms in it’s molecule
(C
4
H
10
). A gas at atmospheric pressure and normal temperature, but easily
liquefied by pressure. Generally stored and delivered in liquefied form and used
as a fuel in gaseous form, obtained by processing natural gas as produced and
also from a process in petroleum refining. Contains approximately 3,260 Btu
per cubic foot.
Butane, Normal see Normal Butane.
Butylene (C4H8) A saturated hydrocarbon (Alkane) with four carbon atoms in it’s molecule
(C
4
H
8
). A gas at room temperature and pressure, but easily liquefied by
lowering the temperature or raising the pressure. This gas is colorless, has a
distinct odor, and is highly flammable. Although not naturally present in
petroleum in high percentages, they can be produced from petrochemicals or
by catalytic cracking of petroleum.
Byte A group of binary digits that combine to make a word. Generally 8 bits. Half
byte is called a nibble. Large computers use 16 bits and 32 bits. Also used to
denote the amount of memory required to store one byte of data.
C10H22 The molecular formula for Decane.
C1H4 The molecular formula for Methane.
C2H4 The molecular formula for Ethylene.
C2H6 The molecular formula for Ethane.