| | BACK PRESSURE |
| | A backward surge of pressure from downstream to upstream of the filter. Can be the result of closing a valve or air entrapped in a liquid system. |
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| | BACK WASH |
| | Reversed flow through a filtration media, as an attempt to clean or “regenerate” a filter. |
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| | BAFFLE |
| | Component of a housing which constitutes a stage when used; removes liquid and solids by impingement; may be either upstream or downstream of the basic filter medium. May also be a plate to protect filter elements from the velocity of flow into a housing. |
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| | BAG-HOUSE |
| | An air filtration structure utilizing fabric filter bags for the purpose of removing solid particulate from the gas stream; dust collector. |
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| | BAG-ON-CAGE |
| | The concept of selling both the bag and cage as one unit. Normally installed together by the plant. |
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| | BAR |
| | A unit of pressure. One bar = 14.5 psi. |
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| | BASKET |
| | Element for a basket strainer. A device normally using a screen as its medium for removal of coarse bulk solids. |
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| | BASKET STRAINER |
| | A vessel for the removal of coarse bulk solids from liquids, air or gas. The element is usually a steel perforated basket, or a mesh lined basket. |
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| | BCP |
| | | A design code for pressure housing based on the manufacture’s best commercial practice. | |
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| | BETA RATIO |
| | The ratio of the number of particles colliding with the filter to the number of particles passed through the filter. Also, an indication of how a filter performs throughout the life of the filter. B10 represents the filtration ratio at 10 micrometers of the ratio of the upstream to downstream particles larger than 10 micrometers. |
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| | BLEED THROUGH |
| | Particulate migration through the interstices of the filter bag fabric. |
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| | BLINDING |
| | Fabric blockage by dust, fume, or liquid not being discharged by the cleaning mechanism, results in a reduced gas flow of increased pressure drop across the filter media. |
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| | BLIND SPOTS |
| | A area of the filter media where no filtration takes place. Also referred to as dead areas. |
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| | BLOWDOWN |
| | The use of pressure to remove liquids and/or solids from a vessel. |
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| | BOYLE’S LAW |
| | If the temperature of a given kind of gas is held constant, the volume of a sample of gas varies inversely with the pressure. |
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| | BRIDGING |
| | material of particulate blockage across an opening, often of a pore or filter medium. |
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| | BROWNIAN MOTION |
| | The continuous zig-zag motion of suspended minuscule particles. The motion is caused by impact of the molecules of the fluid upon the particles. |
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| | BRUST PRESURE |
| | The pressure causing rupture. The inside-out differential pressure that causes outward pressure on the structural of a filter medium, filter or housing. |
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| | BUBBLE POINT PRESSURE |
| | A test to determine the maximum pore size openings of a filter. |
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| | BUNA-N |
| | A synthetic rubber gasket material, used for vessel closures, flanges and filter elements. |
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| | BURSTING STRENGTH |
| | General - A material’s ability to resist rupture by pressure. Specific - Force required to rupture a fabric by distending it with the force applied at right
angles to the fabric plane under specified conditions. Usually expressed in pounds per square inch. |
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| | BY-PASS |
| | A condition that occurs when the filter media is violated and permits unfiltered fluid to pass through. |
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