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Control and Instrumentation GlossaryWe have 18 entries in our Glossary for this letter. Backlash The relative movement of interlocked mechanical parts that occurs when motion is reversed. Occasionally observed in valve actuators Further Reading Balance Ring Similar to a Mono Flange but without the transition. It incorporates either a drain valve or a drain vent. Often used to simplify Diaphragm seal installations. Further Reading Bandwidth Data carrying capacity. Further Reading BASEEFA (2001) British Approvals Service for Electrical Equipment in Flammable Atmospheres - UK based testing institute and Notified Body. 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 Bipolar A signal range that includes both positive and negative values e.g -5 V to +5 V 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 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 BPSD Barrels per Stream Day - A unit of flow measurement used on refineries. Further Reading Breakdown Voltage The voltage at which circuit components begin to be damaged. 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 British Standards Website 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 Bursting Disc A non-reclosing element designed to burst or rupture at a predetermined pressure to protect systems or individual plant from unacceptable levels of pressure or vacuum. Bursting discs are sometimes called rupture discs. Further Reading Bus Bar A conducting bar that carries heavy current to supply several electric circuits. Further Reading Byte 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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