b'GlossaryHydrophilic Fiber Singeing Fiber that readily absorbs water.Passing of the filter medium over an open flame, thereby removing the protruding surface fibers. Singeing the Hydrophobic Fibercollection side of the filter allows for easier dust cake Fiber that does not readily absorb water. removal.Magnehelic GaugeSonic Cleaning Instrument to measure the differential pressure betweenSonic energy from air-powered horns produces shock the dirty (inlet) and clean (outlet) sides of a baghouse. Aswaves, which enhance dust removal from fabrics. Sonic a general rule differential pressures greater than 7 W.G.cleaning is typically used in reverse-air application involving indicate serious performance problems with the unit andfiberglass bag. require investigation.Specific gravity Mullen Burst TestThe ratio of a mass of a unit volume of a substance to Standardized ASTM test method to measure the strengththe mass of the same volume of a standard substance at of a filter material under multidirectional pressure expresseda standard temperature. For gases, dry air at the same in pounds per square inch.temperature and pressure as the gas is often taken as the standard substance.Permeability A measurement of the ability of air to flow through a filterStaple Fiber at a given differential pressure. The value is expressed asShort fiber cut to specific length in synthetics to either (U.S.) cubic feet per minute at .5 water gauge differentialform yarns or non-woven felts. The size, distribution and or (Metric) liter/min at 20mm water gauge differential. type of fibers used in filtration vary to suit process needs. Selecting the right combination is essential for maximum Plenum Chamberperformance.An air compartment maintained under pressure, and connected to one or more ducts. A pressure-equalizingTensile Strengthchamber.A measure of the ability of yarn or fabric to resist breaking by direct tension. Pre-coat Pre-coat is good insurance for operations that may haveTube Sheet issues during start-up that could impact the bags, such asThe steel plate that bags are suspended from in a unspent hydrocarbons and excessive moisture. The pre- baghouse. Both the diameter and thickness are crucial data coating also enhances the initial efficiency of the baghouseto ensure a dust tight seal.reducing bleed through of particulate.Venturi Pulse-jetAn air affect passage that gradually contracts to a smaller Type of baghouse design where dust is collected on theopening and expands again at a different rate thus causing exterior of a filter tube, supported by a cage, and cleanedacceleration of flow and gradient pressure change. Venturis with a rapid pulse of compressed air driven down theare typically used in pulse-jet cages to enhance the pulse interior of the filter tube. clean cycle. However they also restrict normal flow as well and add to system delta P. (See Sonitec 2000 Nozzle Scrimpage 23 for a different approach.)A very loosely woven fabric onto which felt is needled to add dimensional stability and strength. Use of scrims are declining as high performance textile equipment is allowing for creation of 100% fiber media with the same or superior strength characteristics.34 www.standardfilter.com1.800.634.58371.760.929.8559'