Compressed Air Glossary:b.html

Compressed Air Glossary of Terms

[INDEX] A B C D E F G H I J K L M N O P Q R S T U V W X Y Z [ADD]

BA: ACRONYM - Breathing air (099)

Back pressure: Resistance to air flow; usually stated in inches H2O 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.(044)

Bag filter: a fabric bag through which a gas stream is passed for the removal of particulate matter.(044)


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.(044)

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.(0301)

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.(445)
Barg: Bar gauge (similar to the acronym "psig")(200)
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. (099)
Base air requirement: (BAR) The quantity of compressed 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.(0301)
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. (058)
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. (058)


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. (099)
BHP: ACRONYM - Break horse power (099)

Bicarbonate: An acid carbonate. (099)
BLDN: ACRONYM - Blowdown. (099)
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". (055)
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. (445)
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. (010)

BP: ACRONYM - Back pressure. (099)

BLWR

ACRONYM - Blower. (099)

Body

The stationary seating surface, the inlet of a valve. (055)

Bonnet

The portion of a safety/relief valve that surrounds the spring. The spring housing. (055)

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.(0301)

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.(0301)

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. (011)

Breakdown maintenance

Maintenance performed after a machine has failed to return it to an operating state. (395)

Breaker

A hand held pneumatic tool. Designed for light demolition work, digging, making holes etc. (099)

Breaking pressure

Is that pressure of either the motive fluid or of the ejector gas discharge which causes an ejector to become unstable.

Breather

A filtering unit for vented enclosures installed to prevent dirt and foreign matter from entering the enclosure. (050)

Breathing air

Specialty compressed air treatment meeting OSHA Grade D breathing air requirements. (020)

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. (395)

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. (081)

BSPP

ACRONYM - British standard pipe parallel. (099)

BSPT

ACRONYM - British standard pipe tapered. (099)

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. (081)

Bubble

In spray painting applications, air trapped in a paint film caused by poor atomization during spraying. (558)

Built-in-dirt

Material passed into the effluent stream composed of foreign materials incorporated into the filter medium. (395)

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 (557)

Bulk specialty gas supply

(BSGS) Special system designed for the delivery of large specialty gas volumes; product can be delivered in mobile containers up to tube trailer size, or stationary containers such as hydril tubes or a liquid tank.(0301)

Bumper

An internal compression stop. Generally a molded rubber part attached inside an air actuator. (058)

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.

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Impact RM | Comments: | Last updated, 24-January 2003