b'GlossaryAcrylicDust Cake Synthetic polymer fiber that goes by trade names Orlon,Essential buildup of porous dust layer on the surface of a Draylon, and is composed of at least 86% acrylonitrile.filter, which significantly increases the efficiency of the filter. There are two groups: Modacrylics and Homopolymers. Proper management of the dust cake also effects useful life of the filter.Baffle A plate, grating, or refractory wall used especially to block,Dust Loading hinder, or divert a flow. The baghouse inlet typically has theThe amount of particulate (by weight) that is suspended in highest velocity. Particulate will sandblast the lower portiona gas stream at the baghouse inlet. Usually expressed in of the bags in the baghouse in the absence of a baffle. grains per cubic foot.Bleed-throughEpitropic Fiber Particulate migrates through the filter media and isFiber whose surface contains embedded particles to modify discharged up the stack.one or more properties of the fiber, typically electrical conductivity.Blinding Particulate accumulates within and/or on the surface of theFelled Seam media such that the flow passages for the gas are blockedVertical seam in a filter bag, typically a non-woven, which restricting the flow and resulting in high pressure drop. requires an overlap of the material.Can VelocityFilter Cake Velocity of the baghouse process air as it flows upwardThe accumulation of dust on a bag. Often assists in the through the rows of bags. Formula: Area of the Baghousefiltration process. in Square Feet minus the area of the diameter of the filter bags divided by the ACFM of the process air. ExcessiveFilter Media Can Velocity can cause premature bag wear due toThe permeable barrier employed in the filtration process to abrasion and can cause more dust to be carried upwardseparate the particles from the fluid stream.to the bags overloading the bags and the cleaning system. Conversely a Low Can Velocity can cause segregation ofFly Ash the incoming dust carrying only the finest of particles whichFinely divided particles of ash entrained in flue gases can prevent the formation of a good Dust Cake. resulting from the combustion of fuel. The ash particles consist of incompletely burned fuel and a variety of mineral Capture Velocityconstituents.The air velocity at any point in front of the hood or at the hood opening necessary to prevent particulate material andGrain contaminant gases from escaping into the working area. The amount of particulate (by weight) that is suspended in a gas stream at the baghouse inlet. See also Dust Loading. Diaphragm Valve A compressed air operated valve that is used to deliver airGround Wire in short bursts to pulse clean bags. Braided metal strip, usually copper or stainless steel, placed on or in the seam and grounded to the collector to assist in Differential Pressuredissipating static build-up caused by the gas flow. In a Dust Collection System usually refers to the difference in pressure (typically measured in inches of water columnHydrolysis W.G.) between the dirty side of the baghouse and the cleanA chemical reaction in which water reacts with another side of the baghouse. Essentially this yields the pressuresubstance, either dust or the filter media, drop or resistance to the air-flow through the filter bag.breaking the chemical links and creating two or more substances. The presence of water in a baghouse is a significant detriment to the filter media.www.standardfilter.com1.800.634.58371.760.929.8559 33'