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A device which ensures that the wearer has a continuously available supply of uncontaminated air through a face mask; helmet or mouthpiece.
Often referred to as a BA set.
Further Reading


BASEEFA (2001)

British Approvals Service for Electrical Equipment in Flammable Atmospheres - UK based testing institute and Notified Body.

Further Reading



Best Available Techniques
Often refered with respect to pollution reduction. More onerous than ALARP.
Further Reading


Battery Limits

The perimeter surrounding the processing area and included process equipment of a process plant.

Further Reading


Baud Rate

Serial communications data transmission rate expressed in bits per second.

Further Reading


bbl - Barrel

A volumetric unit of measure for crude oil and petroleum products. Derived by the original use of spent whiskey barrels to hold oil in the 1800s.
One barrel equals 42 U.S. gallons, equivalent to 158.978 litres.
Further Reading



Bubbling Fluidised Bed

Further Reading



British Helicopter Advisory Board

Further Reading



Boiling Liquid Expanding Vapour Explosion

Further Reading



Uncontrolled flow of gas and/or oil or other well fluids from a well during drilling.

Further Reading



Basis of Design

Further Reading


BOD - BiologicaL Oxygen Demand

The amount of oxygen used for biochemical oxidation by a unit volume of water at a given temperature and for a given time.
Used as an index of the degree of organic pollution in water.
Further Reading
Chemical Oxygen Demand

BoE - Barrel of Oil Equivalent

A measure of gas. A BoE has similar energy content as a barrel of Oil. Approx 167 MMscf depending on calorific value of the gas.

Further Reading


BOM - Bill Of Materials

A listing of materials for a job. The result of a Material Take Off.

Further Reading


BOP - Blow Out Preventor

Hydraulically or mechanically actuated valve installed at the wellhead to control pressure within the well.

Further Reading


BOPD - Barrels of Oil per Day

Unit of measurement of crude oil produced by a well or a field. The volume of a barrel is equivalent to 42 US gallons (0.16 metres cubed).

Further Reading



Basic Offshore Induction and Emergency Training - mandatory course required prior to visiting UK offshore Oil & Gas installations.

Further Reading
Guide to Offshore Working


Barrels per Stream Day - A unit of flow measurement used on refineries.

Further Reading


BSI - British Standards Institution

Responsible for the preparation of UK National Standards prefixed BS *** and publication of harmonised standards in the UK prefixed BS EN ***.

Further Reading


BTU - British Thermal Unit

A unit of energy i.e. the amount of energy required to raise the temperature of 1 pound of water 1 degree Fahrenheit when the water is near 39.2 degrees Fahrenheit.

Further Reading



Business Unit

Further Reading


Bus Bar

A conducting bar that carries heavy current to supply several electric circuits.

Further Reading



Eight related bits of data or an eight-bit binary number. Also denotes the amount of memory required to store one byte of data.

Further Reading


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