[{"data":1,"prerenderedAt":832},["ShallowReactive",2],{"site-footer-common":3,"glossary:plenum-clean-side-dirty-side":45,"glossary-related:plenum-clean-side-dirty-side":192},{"id":4,"extension":5,"footer":6,"meta":40,"navbar":41,"stem":43,"__hash__":44},"common\u002Fcommon.yml","yml",{"tagline":7,"links":8,"sections":9},"Acoustic cleaning intelligence for industrial fouling, soot, ash, dust and build-up.",[],[10,19,31],{"title":11,"links":12},"Product",[13,16],{"label":14,"to":15},"How it works","\u002F#product",{"label":17,"to":18},"Cost assessment","\u002F#hero",{"title":20,"links":21},"Company",[22,25,28],{"label":23,"to":24},"What we build","\u002F#about",{"label":26,"to":27},"Careers","\u002F#careers",{"label":29,"to":30},"Contact","\u002F#contact",{"title":32,"links":33},"Resources",[34,37],{"label":35,"to":36},"Blog","\u002Fresources\u002Fblog",{"label":38,"to":39},"Glossary","\u002Fglossary",{},{"links":42},[],"common","YocmZRy1AYfBbpgGVms-zhdiABlF8VTxHx6h4rDmZBA",{"id":46,"title":47,"aliases":48,"body":53,"category":69,"description":174,"extension":175,"meta":176,"navigation":177,"path":178,"relatedTerms":179,"seo":182,"sources":185,"stem":189,"term":190,"__hash__":191},"glossary\u002Fglossary\u002Fplenum-clean-side-dirty-side.md","Plenum (clean side \u002F dirty side)",[49,50,51,52],"clean plenum","dirty plenum","clean side","dirty side",{"type":54,"value":55,"toc":167},"minimark",[56,71,101,109,114,121,125,141,145],[57,58,59,60,64,65,70],"p",{},"A ",[61,62,63],"strong",{},"plenum"," is a gas-flow chamber inside a ",[66,67,69],"a",{"href":68},"\u002Fglossary\u002Fbaghouse","baghouse",". Every baghouse has at least two:",[72,73,74,91],"ul",{},[75,76,77,80,81,85,86,90],"li",{},[61,78,79],{},"Dirty plenum"," — below the ",[66,82,84],{"href":83},"\u002Fglossary\u002Ftubesheet","tubesheet","; accepts the incoming flue-gas flow; surrounds the outside of the ",[66,87,89],{"href":88},"\u002Fglossary\u002Ffilter-bag","filter bags","; contains the bag-and-cage assemblies",[75,92,93,96,97],{},[61,94,95],{},"Clean plenum"," — above the tubesheet; collects filtered gas leaving the inside of each bag; routes to the outlet duct and ",[66,98,100],{"href":99},"\u002Fglossary\u002Fid-fan","ID fan",[57,102,103,104,108],{},"The pressure difference between the two plenums is the baghouse ",[66,105,107],{"href":106},"\u002Fglossary\u002Fdifferential-pressure-baghouse","differential pressure",", the headline operational KPI.",[110,111,113],"h2",{"id":112},"in-a-pulse-jet-baghouse","In a pulse-jet baghouse",[57,115,59,116,120],{},[66,117,119],{"href":118},"\u002Fglossary\u002Fpulse-jet-baghouse","pulse-jet baghouse"," adds a small inlet plenum above the clean plenum that houses the air-receiver tank and the manifold of pulse valves. Each valve fires downward through a venturi into the open top of a bag, momentarily reversing flow.",[110,122,124],{"id":123},"in-a-reverse-air-baghouse","In a reverse-air baghouse",[57,126,59,127,131,132,136,137,140],{},[66,128,130],{"href":129},"\u002Fglossary\u002Freverse-air-baghouse","reverse-air baghouse"," compartment alternates between ",[133,134,135],"em",{},"filtration mode"," (gas flows from dirty plenum, through the bag wall, into the clean plenum) and ",[133,138,139],{},"cleaning mode"," (compartment isolated; reverse-air fan flows clean gas back through the bags into the dirty plenum).",[110,142,144],{"id":143},"related-terms","Related terms",[72,146,147,152,157,162],{},[75,148,149],{},[66,150,151],{"href":68},"Baghouse",[75,153,154],{},[66,155,156],{"href":83},"Tubesheet",[75,158,159],{},[66,160,161],{"href":88},"Filter bag",[75,163,164],{},[66,165,166],{"href":106},"Differential pressure (baghouse)",{"title":168,"searchDepth":169,"depth":169,"links":170},"",2,[171,172,173],{"id":112,"depth":169,"text":113},{"id":123,"depth":169,"text":124},{"id":143,"depth":169,"text":144},"A plenum is a gas-flow chamber inside a baghouse. Every baghouse has at least two:","md",{},true,"\u002Fglossary\u002Fplenum-clean-side-dirty-side",[69,84,180,181],"filter-bag","differential-pressure-baghouse",{"title":183,"description":184},"Plenum (clean side \u002F dirty side) — gas spaces above and below the tubesheet","A plenum is a gas-flow chamber inside a baghouse. The dirty plenum sits below the tubesheet; the clean plenum sits above. Their pressure difference is the headline ΔP.",[186],{"title":187,"url":188},"Wikipedia — Baghouse","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FBaghouse","glossary\u002Fplenum-clean-side-dirty-side","Plenum","kXP5RNeDoTLNyQ5KaNd0bkO5UxmyotBo9tan_mJfH-I",[193,314,420,647],{"id":194,"title":151,"aliases":195,"body":199,"category":69,"description":299,"extension":175,"meta":300,"navigation":177,"path":68,"relatedTerms":301,"seo":307,"sources":310,"stem":312,"term":151,"__hash__":313},"glossary\u002Fglossary\u002Fbaghouse.md",[196,197,198],"baghouses","bag filter house","dust collector house",{"type":54,"value":200,"toc":294},[201,218,222,234,238,241,257,259],[57,202,59,203,205,206,208,209,212,213,217],{},[61,204,69],{}," is the structural enclosure that houses the bags, cages, cleaning system, ",[66,207,84],{"href":83},", ",[66,210,211],{"href":178},"plenums"," and hoppers of a ",[66,214,216],{"href":215},"\u002Fglossary\u002Ffabric-filter","fabric-filter"," dust collector. The word is used in both broad (\"the plant has a 12-compartment baghouse\") and narrow (\"a baghouse is the housing, the fabric filter is the system\") senses; in everyday industry practice the two terms overlap.",[110,219,221],{"id":220},"compartmented-design","Compartmented design",[57,223,224,225,228,229,233],{},"Large industrial baghouses are subdivided into several compartments — each with its own gas-flow damper — so that one compartment can be isolated for offline cleaning or bag replacement while the rest stay online. The standard ",[66,226,227],{"href":118},"pulse-jet"," compartment count for utility duty is 8–16; cement and ",[66,230,232],{"href":231},"\u002Fglossary\u002Fwaste-to-energy","WtE"," baghouses may run 20+.",[110,235,237],{"id":236},"why-sonic-horns-help","Why sonic horns help",[57,239,240],{},"Sonic horns mounted at compartment level address fouling that the primary cleaning system (pulse-jet, reverse-air or shaker) cannot reach:",[72,242,243,246,251,254],{},[75,244,245],{},"Bag-row dead zones at the back of the compartment",[75,247,248,250],{},[66,249,156],{"href":83}," area dust deposits",[75,252,253],{},"Hopper bridging below the bags",[75,255,256],{},"Inlet-plenum dust dropout",[110,258,144],{"id":143},[72,260,261,266,271,276,282,288],{},[75,262,263],{},[66,264,265],{"href":215},"Fabric filter",[75,267,268],{},[66,269,270],{"href":118},"Pulse-jet baghouse",[75,272,273],{},[66,274,275],{"href":129},"Reverse-air baghouse",[75,277,278],{},[66,279,281],{"href":280},"\u002Fglossary\u002Fshaker-baghouse","Shaker baghouse",[75,283,284],{},[66,285,287],{"href":286},"\u002Fglossary\u002Fcompartment-isolation","Compartment isolation",[75,289,290],{},[66,291,293],{"href":292},"\u002Fglossary\u002Fsonic-horn","Sonic horn",{"title":168,"searchDepth":169,"depth":169,"links":295},[296,297,298],{"id":220,"depth":169,"text":221},{"id":236,"depth":169,"text":237},{"id":143,"depth":169,"text":144},"A baghouse is the structural enclosure that houses the bags, cages, cleaning system, tubesheet, plenums and hoppers of a fabric-filter dust collector. The word is used in both broad (\"the plant has a 12-compartment baghouse\") and narrow (\"a baghouse is the housing, the fabric filter is the system\") senses; in everyday industry practice the two terms overlap.",{},[216,302,303,304,305,306],"pulse-jet-baghouse","reverse-air-baghouse","shaker-baghouse","compartment-isolation","sonic-horn",{"title":308,"description":309},"Baghouse — vessel that houses fabric-filter bags for industrial dust control","A baghouse is the structural enclosure that holds the bags, cages, tubesheet, cleaning system and hoppers of a fabric-filter dust collector. Sized in compartments for online isolation.",[311],{"title":187,"url":188},"glossary\u002Fbaghouse","TraeRQp5lNGOrkFkwjsoYRrhIIRrMkFonwryXyc1wGw",{"id":315,"title":156,"aliases":316,"body":320,"category":69,"description":408,"extension":175,"meta":409,"navigation":177,"path":83,"relatedTerms":410,"seo":413,"sources":416,"stem":418,"term":156,"__hash__":419},"glossary\u002Fglossary\u002Ftubesheet.md",[317,318,319],"tube sheet","bag sheet","cell plate",{"type":54,"value":321,"toc":403},[322,338,342,345,348,374,378,381,383],[57,323,324,325,327,328,330,331,333,334,337],{},"The ",[61,326,84],{}," is the perforated steel plate that separates the dirty-gas and clean-gas ",[66,329,211],{"href":178}," inside a ",[66,332,69],{"href":68},". Each hole in the tubesheet corresponds to one ",[66,335,336],{"href":88},"filter bag","; the bag hangs below, sealed against the hole rim by a snap-band collar at its top.",[110,339,341],{"id":340},"why-tubesheet-integrity-is-critical","Why tubesheet integrity is critical",[57,343,344],{},"The tubesheet is the structural and gas-tight boundary that prevents dirty flue gas from bypassing the bags entirely. Any failure of seal or perforation immediately admits unfiltered gas into the clean plenum and out of the stack as a particulate emission.",[57,346,347],{},"Failure modes include:",[72,349,350,356,362,368],{},[75,351,352,355],{},[61,353,354],{},"Snap-band leakage"," — bag collar improperly seated or distorted",[75,357,358,361],{},[61,359,360],{},"Hole erosion"," — fly ash gradually wearing the perforation",[75,363,364,367],{},[61,365,366],{},"Tubesheet warping"," — thermal cycling on long, lightly-supported plates",[75,369,370,373],{},[61,371,372],{},"Bag-bottom collapse"," that lifts the snap-band from the tubesheet hole",[110,375,377],{"id":376},"inspection-access","Inspection access",[57,379,380],{},"The tubesheet is inspected from above (clean side) during outages, walking on plywood mats to avoid distorting it. Any leaking bag is identified by deposits on the tubesheet top side around the affected hole.",[110,382,144],{"id":143},[72,384,385,389,393,399],{},[75,386,387],{},[66,388,151],{"href":68},[75,390,391],{},[66,392,161],{"href":88},[75,394,395],{},[66,396,398],{"href":397},"\u002Fglossary\u002Fbag-cage","Bag cage",[75,400,401],{},[66,402,47],{"href":178},{"title":168,"searchDepth":169,"depth":169,"links":404},[405,406,407],{"id":340,"depth":169,"text":341},{"id":376,"depth":169,"text":377},{"id":143,"depth":169,"text":144},"The tubesheet is the perforated steel plate that separates the dirty-gas and clean-gas plenums inside a baghouse. Each hole in the tubesheet corresponds to one filter bag; the bag hangs below, sealed against the hole rim by a snap-band collar at its top.",{},[69,180,411,412],"bag-cage","plenum-clean-side-dirty-side",{"title":414,"description":415},"Tubesheet — perforated steel plate separating clean and dirty plenums","The tubesheet is the perforated steel plate that separates the clean and dirty plenums of a baghouse. Filter bags hang from holes in the tubesheet, sealed by snap-band collars.",[417],{"title":187,"url":188},"glossary\u002Ftubesheet","BqG0wsQyC3aeHKMnNW5ymH_1qVNZNu2t5EhfxvgFpJo",{"id":421,"title":161,"aliases":422,"body":424,"category":69,"description":633,"extension":175,"meta":634,"navigation":177,"path":88,"relatedTerms":635,"seo":640,"sources":643,"stem":645,"term":161,"__hash__":646},"glossary\u002Fglossary\u002Ffilter-bag.md",[89,423],"bag (baghouse)",{"type":54,"value":425,"toc":628},[426,442,446,459,558,562,597,599],[57,427,59,428,430,431,434,435,437,438,441],{},[61,429,336],{}," is the cylindrical fabric sock that traps particulate inside a ",[66,432,433],{"href":215},"fabric filter",". Bags are typically 120–300 mm in diameter and 2–10 m long, suspended vertically from the ",[66,436,84],{"href":83},", supported internally by a wire ",[66,439,440],{"href":397},"bag cage"," and sealed at the top by a snap-band collar.",[110,443,445],{"id":444},"media-selection","Media selection",[57,447,448,449,453,454,458],{},"Bag media must match the application temperature, gas chemistry, dust load and cleaning system. See ",[66,450,452],{"href":451},"\u002Fglossary\u002Fp84-nomex-ryton-filter-media","P84 \u002F Nomex \u002F Ryton filter media"," and ",[66,455,457],{"href":456},"\u002Fglossary\u002Fptfe-membrane-filter-bag","PTFE membrane filter bag",".",[460,461,462,478],"table",{},[463,464,465],"thead",{},[466,467,468,472,475],"tr",{},[469,470,471],"th",{},"Material",[469,473,474],{},"Max continuous temp",[469,476,477],{},"Typical use",[479,480,481,493,504,515,526,537,548],"tbody",{},[466,482,483,487,490],{},[484,485,486],"td",{},"Polyester",[484,488,489],{},"135 °C",[484,491,492],{},"Cement, food, light industrial",[466,494,495,498,501],{},[484,496,497],{},"Polypropylene",[484,499,500],{},"90 °C",[484,502,503],{},"Wet chemistry, washdown",[466,505,506,509,512],{},[484,507,508],{},"Nomex (aramid)",[484,510,511],{},"200 °C",[484,513,514],{},"Asphalt, metallurgical",[466,516,517,520,523],{},[484,518,519],{},"P84 (polyimide)",[484,521,522],{},"240 °C",[484,524,525],{},"Cement, biomass",[466,527,528,531,534],{},[484,529,530],{},"Ryton (PPS)",[484,532,533],{},"190 °C",[484,535,536],{},"Coal-fired utility, sulphur-rich",[466,538,539,542,545],{},[484,540,541],{},"Fibreglass",[484,543,544],{},"260 °C",[484,546,547],{},"Cement, WtE high-temperature",[466,549,550,553,555],{},[484,551,552],{},"PTFE (Teflon)",[484,554,544],{},[484,556,557],{},"Aggressive chemistry, sub-mg outlet",[110,559,561],{"id":560},"failure-modes","Failure modes",[72,563,564,573,579,585,591],{},[75,565,566,572],{},[61,567,568],{},[66,569,571],{"href":570},"\u002Fglossary\u002Fbag-blinding","Bag blinding"," — pore choking that raises ΔP",[75,574,575,578],{},[61,576,577],{},"Abrasion"," — wear at the bottom of the bag from falling cake",[75,580,581,584],{},[61,582,583],{},"Thermal degradation"," — exceeding the media's continuous-service rating",[75,586,587,590],{},[61,588,589],{},"Hydrolysis \u002F acid attack"," — at the cold end below the acid dew point",[75,592,593,596],{},[61,594,595],{},"Cage corrosion"," — failure of the cage allows bag collapse",[110,598,144],{"id":143},[72,600,601,605,609,613,618,624],{},[75,602,603],{},[66,604,265],{"href":215},[75,606,607],{},[66,608,151],{"href":68},[75,610,611],{},[66,612,398],{"href":397},[75,614,615],{},[66,616,617],{"href":456},"PTFE-membrane filter bag",[75,619,620],{},[66,621,623],{"href":622},"\u002Fglossary\u002Ffibreglass-filter-bag","Fibreglass filter bag",[75,625,626],{},[66,627,571],{"href":570},{"title":168,"searchDepth":169,"depth":169,"links":629},[630,631,632],{"id":444,"depth":169,"text":445},{"id":560,"depth":169,"text":561},{"id":143,"depth":169,"text":144},"A filter bag is the cylindrical fabric sock that traps particulate inside a fabric filter. Bags are typically 120–300 mm in diameter and 2–10 m long, suspended vertically from the tubesheet, supported internally by a wire bag cage and sealed at the top by a snap-band collar.",{},[216,69,411,636,637,638,639],"ptfe-membrane-filter-bag","fibreglass-filter-bag","p84-nomex-ryton-filter-media","bag-blinding",{"title":641,"description":642},"Filter bag — the cylindrical fabric element of a baghouse","A filter bag is the cylindrical fabric sock that traps particulate inside a fabric filter. Media selection depends on temperature, gas chemistry, dust load and cleaning cycle.",[644],{"title":187,"url":188},"glossary\u002Ffilter-bag","c5qm1D9QdtuF4K2dtGAjDJ_qJJmuF0iuEqVTUcRXqww",{"id":648,"title":166,"aliases":649,"body":654,"category":69,"description":818,"extension":175,"meta":819,"navigation":177,"path":106,"relatedTerms":820,"seo":823,"sources":826,"stem":830,"term":166,"__hash__":831},"glossary\u002Fglossary\u002Fdifferential-pressure-baghouse.md",[650,651,652,653],"baghouse ΔP","baghouse delta-P","filter ΔP","baghouse dP",{"type":54,"value":655,"toc":812},[656,676,680,759,763,770,774,780,782],[57,657,658,661,662,664,665,667,668,672,673,458],{},[61,659,660],{},"Differential pressure (ΔP)"," across a ",[66,663,69],{"href":68}," is the pressure drop between the dirty-gas inlet ",[66,666,63],{"href":178}," and the clean-gas outlet plenum. ΔP is the headline operational KPI for any fabric filter: too low signals broken bags or open compartments, too high signals fouling, ",[66,669,671],{"href":670},"\u002Fglossary\u002Fcake-bridging-cake-blinding","bridging"," or ",[66,674,675],{"href":570},"blinding",[110,677,679],{"id":678},"typical-operating-bands","Typical operating bands",[460,681,682,698],{},[463,683,684],{},[466,685,686,689,692,695],{},[469,687,688],{},"Application",[469,690,691],{},"Normal ΔP",[469,693,694],{},"Alarm",[469,696,697],{},"Trip",[479,699,700,716,733,746],{},[466,701,702,707,710,713],{},[484,703,704,705],{},"Cement ",[66,706,227],{"href":118},[484,708,709],{},"8–15 mbar (3–6 inWG)",[484,711,712],{},"20 mbar",[484,714,715],{},"25 mbar",[466,717,718,724,727,730],{},[484,719,720,721],{},"Coal utility ",[66,722,723],{"href":129},"reverse-air",[484,725,726],{},"10–18 mbar",[484,728,729],{},"22 mbar",[484,731,732],{},"28 mbar",[466,734,735,738,741,743],{},[484,736,737],{},"WtE pulse-jet",[484,739,740],{},"12–20 mbar",[484,742,715],{},[484,744,745],{},"32 mbar",[466,747,748,751,754,757],{},[484,749,750],{},"Light industrial pulse-jet",[484,752,753],{},"5–12 mbar",[484,755,756],{},"18 mbar",[484,758,715],{},[110,760,762],{"id":761},"why-operators-obsess-over-δp","Why operators obsess over ΔP",[57,764,765,766,769],{},"Every additional mbar of ΔP costs ID-fan power and reduces plant throughput. A 5-mbar ΔP rise on a large coal-fired baghouse can mean hundreds of kW of additional fan power and the loss of a few MW of derate-induced generation. Sustained high ΔP also accelerates ",[66,767,768],{"href":570},"bag blinding"," and triggers premature bag-change campaigns.",[110,771,773],{"id":772},"how-sonic-horns-reduce-δp","How sonic horns reduce ΔP",[57,775,776,779],{},[66,777,778],{"href":292},"Sonic horns"," keep the bag-surface cake from consolidating into the medium between primary cleaning cycles. Pulse-jet, reverse-air or shaker cleaning then has less work to do and removes a larger fraction of the cake. Plants retrofitting sonic horns commonly see 2–5 mbar ΔP reduction and 25–40% extension of bag life.",[110,781,144],{"id":143},[72,783,784,788,792,798,802,808],{},[75,785,786],{},[66,787,265],{"href":215},[75,789,790],{},[66,791,151],{"href":68},[75,793,794],{},[66,795,797],{"href":796},"\u002Fglossary\u002Ffilter-cake","Filter cake",[75,799,800],{},[66,801,571],{"href":570},[75,803,804],{},[66,805,807],{"href":806},"\u002Fglossary\u002Fpulse-jet-cleaning-cycle","Pulse-jet cleaning cycle",[75,809,810],{},[66,811,293],{"href":292},{"title":168,"searchDepth":169,"depth":169,"links":813},[814,815,816,817],{"id":678,"depth":169,"text":679},{"id":761,"depth":169,"text":762},{"id":772,"depth":169,"text":773},{"id":143,"depth":169,"text":144},"Differential pressure (ΔP) across a baghouse is the pressure drop between the dirty-gas inlet plenum and the clean-gas outlet plenum. ΔP is the headline operational KPI for any fabric filter: too low signals broken bags or open compartments, too high signals fouling, bridging or blinding.",{},[216,69,821,639,822,306],"filter-cake","pulse-jet-cleaning-cycle",{"title":824,"description":825},"Differential pressure (baghouse ΔP) — the headline KPI for fabric filters","Differential pressure (ΔP) across a baghouse is the pressure drop between dirty and clean plenums. It is the headline operational KPI: too low signals broken bags, too high signals fouling.",[827],{"title":828,"url":829},"Sly Inc — How to Monitor Baghouse Health Through Differential Pressure","https:\u002F\u002Fwww.slyinc.com\u002Fblog\u002Fhow-to-monitor-baghouse-health-through-differential-pressure\u002F","glossary\u002Fdifferential-pressure-baghouse","5pIag8o_scInCb_UF6sVlqlEgtkNoIR5M4nNm3qHxk4",1782613721214]