Brake Horsepower (bhp)
|
The maximum rate at which an engine can do work as
measured by the resistance of an applied brake and expressed in horsepower. |
| Back Pressure |
Resistance to air flow; usually stated in inches
H20 or PSI. |
| 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. |
Balanced Valve
|
A whistle valve in which the steam or compressed air itself
is made to provide a portion of the force needed to open the valve. Also
called a compound valve or equalized valve. |
| Bar |
A unit of pressure equal to 0.99 atmospheres or 14.233 psi. |
| Bara |
The pressure of a system or device measured from absolute zero. |
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 Air Requirement
(BAR)
|
The quantity of compressed air required by
the customer to meet normal system demand as defined in Standard Cubic Feet
per Minute (SCFM). The BAR is established to cover the maximum requirement
of the customer during the normal production cycle. |
Base Plate
|
A metallic structure onto which a compressor or other machine
is mounted. |
Bead Ring
|
A ring used to attach certain bellows type flexible members of
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. |
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. |
| 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. |
Booster Compressor
|
Machines for compressing air or gas from an initial
pressure, which is above atmospheric pressure, to a still higher pressure. |
Bowl
|
The portion of a whistle base in which steam or air flows from the
inlet to the slit, so named because it is frequently hemi-spherical in
shape. |
Boyle's Law
|
States that the volume of a gas, at constant temperature,
varies inversely with the pressure. |
| 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
|
The pressure of either the motive fluid or of the ejector gas discharge
which causes an ejector to become unstable. |
Breather
|
A filter
applied to vented enclosures to prevent dirt and foreign matter from
entering the enclosure. |
Breathing Air
|
Specialty compressed air treatment meeting OSHA Grade D breathing air
requirements. |
Bridging
|
Condition of a
filter element loading in which a contaminant spans the space between
adjacent sections of the filter element, thus blocking a portion of its
useful filtration. |
Brownian Diffusion
|
A slight deflection of
tiny particles in a gas stream that occurs
when struck by rapidly moving gas molecules. |
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. |
Bubble
|
In spray painting
applications, air trapped in a paint film caused by poor atomization during
spraying. |
