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Compressed Air Glossary of Terms :: B ::
Glossary Index
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BA
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ACRONYM
- Breathing air
-
Back pressure
-
Resistance to air flow; usually stated in inches H2O or
PSI.
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Bag blinding
-
A
condition where the particles (dust) becomes embedded in the fabric filter
over time and are not removed by the bag cleaning process.
-
Bag filter
-
a fabric bag through which a gas stream is passed for the removal of
particulate matter.
-
Bag house
-
a dust-collection chamber containing numerous permeable fabric filters
through which the exhaust gases pass. Finer particulates entrained in the
exhaust gas stream are collected in the filters for subsequent
treatment/disposal.
-
Bar
-
A unit of pressure equal to 0.99 atmospheres or 14.233 psi.
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Bara
-
The pressure of a system or device measured from absolute
zero.
-
Barg
-
Bar gauge (similar to the acronym "psig")
-
Barometric pressure
-
Is the absolute atmospheric pressure existing at any given
point in the atmosphere. It is the weight of a unit column of gas
directly above the point of measurement. It varies with altitude,
moisture and weather conditions.
-
Base plate
-
A metallic structure on which a compressor or other machine is
mounted.
-
Bead ring
-
A ring used to attach certain bellow type flexible members of
an air actuators to the mounting surface.
-
Bernoulli's principle
-
In physics, the concept that as the speed of a moving fluid (liquid or gas)
increases, the pressure within that fluid decreases. Originally formulated
in 1738 by the Swiss mathematician and physicist Daniel Bernoulli, it states
that the total energy in a steadily flowing fluid system is a constant along
the flow path. An increase in the fluid's speed must therefore be matched by
a decrease in its pressure.
Bernoulli's principle applies in nozzles, where flow
accelerates and pressure drops as the tube diameter is reduced. It is also
the principle behind orifice or Venturi flow meters. These meters measure
the pressure difference between a low-speed fluid in an approach pipe and
the high-speed fluid at the smaller orifice diameter to determine flow
velocities and thus to meter the flow rate. Bernoulli's principle is
sometimes mistakenly used to explain the net force in a system that includes
a moving fluid, such as lift on an airplane wing, thrust of a ship's
propeller, or drifting of a spinning baseball. The principle, however, only
applies to systems that do not produce a net force.
-
Beta ratio
-
Efficiency measurement of any filter expressed by the number
of particles of a given size upstream of the filter, divided by
the number of particles of that size downstream of the filter.
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BHP
-
ACRONYM
- Break horse power
-
Bicarbonate
-
An acid carbonate.
-
-
BLDN
-
ACRONYM
- Blowdown.
-
-
Blowdown (BLDN)
-
The difference in pressure between the opening pressure and
reclose pressure of a valve. May be expressed in percentage of set
pressure or "psig".
-
Blower (BLWR)
-
A compressor that is designed to operate at lower pressures.
Usually a blower is an air compressor that operates below 2 barg,
although this figure depends upon the respective manufacturer.
-
Blow off control
-
The compressor continuously compresses, however, when the
maximum pressure is reached, the delivered air is blown off to the
atmosphere instead of being fed to the receiver.
-
BLWR
-
ACRONYM
- Blower.
-
Body
-
The stationary seating surface, the inlet of a valve.
-
Bonnet
-
The portion of a safety/relief valve that surrounds the
spring. The spring housing.
-
Boolean logic
-
The logic of binary systems, such as control systems in which
all operations may be reduced to on-off, open-closed, or similar
dichotomous basis.
-
Booster
-
A machine which aspirates gas which has already been
compressed and delivers the same at higher pressure.
-
BP
-
ACRONYM
- Back pressure.
-
Boyle's law
-
States that the volume of a gas, at constant temperature,
varies inversely with the pressure.
-
Brake horse power (BHP)
-
The maximum rate at which an engine can do work as measured by
the resistance of an applied brake. Expressed in horsepower.
-
Branch lines
-
Are lines that supply equipment from sub headers.
-
Breakdown
maintenance
-
Maintenance performed after a machine has failed to return it
to an operating state.
-
Breaker
-
A hand held pneumatic tool. Designed for light demolition
work, digging, making holes etc.
-
Breaking pressure
-
Is that pressure of either the motive fluid or of the ejector
gas discharge which causes an ejector to become unstable.
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Breather
-
A filtering unit for vented enclosures installed to prevent
dirt and foreign matter from entering the enclosure.
-
Breathing air
-
Specialty compressed air treatment meeting OSHA Grade D
breathing air requirements.
-
Bridging
-
A condition of filter element loading in which contaminant
spans the space between adjacent sections of a filter element,
thus blocking a portion of the useful filtration.
-
Brownian diffusion
-
The
slight deflection of very small particles in a gas stream that occurs when
rapidly moving gas molecules strike them.
-
-
British thermal unit
-
BTU. The amount of heat required to raise the temperature of
one pound of water one degree Fahrenheit under set conditions of
temperature and pressure.
-
BSPP
-
ACRONYM
- British standard pipe parallel.
-
BSPT
-
ACRONYM
- British standard pipe tapered.
-
BTU
-
ACRONYM
- British thermal unit. The amount of heat required to raise the
temperature of one pound of water one degree Fahrenheit under set
conditions of temperature and pressure.
-
Bubble
-
In spray painting applications, air trapped in a paint film
caused by poor atomization during spraying.
-
Built-in-dirt
-
Material passed into the effluent stream composed of foreign
materials incorporated into the filter medium.
-
Built up back
pressure
-
The increase in pressure in the discharge header that develops
as a result of flow after the pressure relief device opens
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Bumper
-
An internal compression stop. Generally a molded rubber part
attached inside an air actuator.
-
Buna N
-
A synthetic rubber frequently used for vessel and liquid
filter element gasket.
-
Burst pressure
-
Maximum pressure a vessel, or air filter housing will
withstand without bursting.
-
By pass
-
Condition that exists when the air, gas, or fluid normally
passing through an element is being shunted around the
element.
-
By pass valve
-
An automatic or manual valve that causes the flow to be by
passed.
Glossary Index
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Thanks to Impact RM for permission to reprint the glossary.
Compressed Air Glossary © Impact RM
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