[{"data":1,"prerenderedAt":1437},["ShallowReactive",2],{"site-footer-common":3,"glossary:anti-bridging-device":45,"glossary-related:anti-bridging-device":272},{"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":52,"category":252,"description":253,"extension":254,"meta":255,"navigation":256,"path":257,"relatedTerms":258,"seo":263,"sources":266,"stem":270,"term":47,"__hash__":271},"glossary\u002Fglossary\u002Fanti-bridging-device.md","Anti-bridging device",[49,50,51],"anti-arching device","flow promoter","flow aid",{"type":53,"value":54,"toc":245},"minimark",[55,83,88,192,196,204,208],[56,57,58,61,62,67,68,72,73,77,78,82],"p",{},[59,60,47],"strong",{}," is the generic procurement term for any flow-aid hardware installed to prevent or break ",[63,64,66],"a",{"href":65},"\u002Fglossary\u002Fbridging","bridging",", ",[63,69,71],{"href":70},"\u002Fglossary\u002Frat-holing","rat-holing"," and other discharge stoppages in a ",[63,74,76],{"href":75},"\u002Fglossary\u002Fhopper","hopper"," or ",[63,79,81],{"href":80},"\u002Fglossary\u002Fsilo","silo",". The category covers a range of technologies with overlapping use cases.",[84,85,87],"h2",{"id":86},"anti-bridging-device-families","Anti-bridging device families",[89,90,91,107],"table",{},[92,93,94],"thead",{},[95,96,97,101,104],"tr",{},[98,99,100],"th",{},"Family",[98,102,103],{},"Mechanism",[98,105,106],{},"Best suited to",[108,109,110,125,139,153,167,181],"tbody",{},[95,111,112,119,122],{},[113,114,115],"td",{},[63,116,118],{"href":117},"\u002Fglossary\u002Fsonic-horn","Sonic horn",[113,120,121],{},"Continuous acoustic vibration",[113,123,124],{},"Most powders, especially cohesive Class-C; non-contact",[95,126,127,133,136],{},[113,128,129],{},[63,130,132],{"href":131},"\u002Fglossary\u002Fair-cannon-air-blaster","Air cannon \u002F air blaster",[113,134,135],{},"Periodic high-pressure pneumatic blast",[113,137,138],{},"Hard bridges, large silos, established practice",[95,140,141,147,150],{},[113,142,143],{},[63,144,146],{"href":145},"\u002Fglossary\u002Fbin-vibrator","Bin vibrator",[113,148,149],{},"Continuous mechanical or pneumatic vibration",[113,151,152],{},"Small bins; can compact wet material",[95,154,155,161,164],{},[113,156,157],{},[63,158,160],{"href":159},"\u002Fglossary\u002Ffluidisation-pad-aeration-pad","Fluidisation pad",[113,162,163],{},"Aerates the lower bed",[113,165,166],{},"Dry, fluidisable powders",[95,168,169,175,178],{},[113,170,171],{},[63,172,174],{"href":173},"\u002Fglossary\u002Fwhip-hammer","Whip hammer",[113,176,177],{},"Manual impact",[113,179,180],{},"Legacy practice; HSE concerns",[95,182,183,186,189],{},[113,184,185],{},"Mechanical extractor",[113,187,188],{},"Bypasses the discharge",[113,190,191],{},"Continuous-flow processes",[84,193,195],{"id":194},"selecting-a-device","Selecting a device",[56,197,198,199,203],{},"Selection depends on material properties (",[63,200,202],{"href":201},"\u002Fglossary\u002Fgeldart-classification","Geldart class",", moisture, temperature), vessel geometry and operating mode. Sonic horns are increasingly the default specification because they cause no structural stress, work continuously, and integrate cleanly into existing control systems.",[84,205,207],{"id":206},"related-terms","Related terms",[209,210,211,217,222,227,231,235,239],"ul",{},[212,213,214],"li",{},[63,215,216],{"href":65},"Bridging",[212,218,219],{},[63,220,221],{"href":75},"Hopper",[212,223,224],{},[63,225,226],{"href":80},"Silo",[212,228,229],{},[63,230,118],{"href":117},[212,232,233],{},[63,234,132],{"href":131},[212,236,237],{},[63,238,146],{"href":145},[212,240,241],{},[63,242,244],{"href":243},"\u002Fglossary\u002Fmaterial-flow-promotion","Material flow promotion",{"title":246,"searchDepth":247,"depth":247,"links":248},"",2,[249,250,251],{"id":86,"depth":247,"text":87},{"id":194,"depth":247,"text":195},{"id":206,"depth":247,"text":207},"hoppers-silos","Anti-bridging device is the generic procurement term for any flow-aid hardware installed to prevent or break bridging, rat-holing and other discharge stoppages in a hopper or silo. The category covers a range of technologies with overlapping use cases.","md",{},true,"\u002Fglossary\u002Fanti-bridging-device",[66,76,81,259,260,261,262],"sonic-horn","air-cannon-air-blaster","bin-vibrator","material-flow-promotion",{"title":264,"description":265},"Anti-bridging device — flow-aid hardware for hoppers and silos","An anti-bridging device is any flow-aid hardware installed to prevent or break material bridging in a hopper or silo: sonic horns, air cannons, vibrators, fluidisation pads.",[267],{"title":268,"url":269},"Wikipedia — Hopper (particulate collection container)","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FHopper_(particulate_collection_container)","glossary\u002Fanti-bridging-device","F84_oGC7LK5MbkcV3H8w2y2q4Rlq57hK9oqpx-7MSRs",[273,466,613,714,943,1085,1278],{"id":274,"title":216,"aliases":275,"body":280,"category":252,"description":449,"extension":254,"meta":450,"navigation":256,"path":65,"relatedTerms":451,"seo":453,"sources":456,"stem":463,"term":464,"__hash__":465},"glossary\u002Fglossary\u002Fbridging.md",[276,277,278,279],"arching","arch formation","hopper bridging","silo bridging",{"type":53,"value":281,"toc":443},[282,298,302,305,326,330,344,348,416,418],[56,283,284,286,287,77,290,292,293,77,295,297],{},[59,285,216],{}," (also ",[288,289,276],"em",{},[288,291,277],{},") is the formation of a stable mechanical arch of bulk-solid material above the discharge outlet of a ",[63,294,76],{"href":75},[63,296,81],{"href":80},". Once a bridge forms, no material flows out of the outlet even though the vessel above is full. Bridging is the universal failure mode of bulk-solids storage.",[84,299,301],{"id":300},"how-a-bridge-forms","How a bridge forms",[56,303,304],{},"Cohesive forces between particles — moisture films, electrostatic charge, chemical bonding — combine with the converging-flow geometry to lock particles into an arch shape. The arch is self-supporting against the load above. Cohesion increases with:",[209,306,307,314,317,320,323],{},[212,308,309,310,313],{},"Fine particle size (especially Geldart-C powders — see ",[63,311,312],{"href":201},"Geldart classification",")",[212,315,316],{},"Moisture",[212,318,319],{},"Hygroscopic chemistry (urea, ammonium nitrate, lime)",[212,321,322],{},"Long residence time (consolidation under sustained load)",[212,324,325],{},"Temperature cycling",[84,327,329],{"id":328},"diagnosing-a-bridge","Diagnosing a bridge",[209,331,332,335,338,341],{},[212,333,334],{},"Outlet flow stops while the level above remains high",[212,336,337],{},"Mass-flow indicators report no movement",[212,339,340],{},"A simple tap on the hopper outside the discharge cone produces a hollow sound",[212,342,343],{},"Borescope inspection from the inlet shows the arch directly",[84,345,347],{"id":346},"remedies","Remedies",[89,349,350,360],{},[92,351,352],{},[95,353,354,357],{},[98,355,356],{},"Technique",[98,358,359],{},"Notes",[108,361,362,371,381,390,399,408],{},[95,363,364,368],{},[113,365,366],{},[63,367,118],{"href":117},[113,369,370],{},"Continuous prevention; non-contact; minimal infrastructure",[95,372,373,378],{},[113,374,375],{},[63,376,377],{"href":131},"Air cannon",[113,379,380],{},"High-intensity periodic; effective on hard bridges; structural stress",[95,382,383,387],{},[113,384,385],{},[63,386,146],{"href":145},[113,388,389],{},"Continuous vibration; can compact powder further if poorly sized",[95,391,392,396],{},[113,393,394],{},[63,395,174],{"href":173},[113,397,398],{},"Manual; legacy; HSE concerns",[95,400,401,405],{},[113,402,403],{},[63,404,160],{"href":159},[113,406,407],{},"Aerates the lower vessel; not suitable for wet material",[95,409,410,413],{},[113,411,412],{},"Mechanical screw extractor",[113,414,415],{},"Bypasses the bridge entirely; high capex",[84,417,207],{"id":206},[209,419,420,424,428,433,439],{},[212,421,422],{},[63,423,221],{"href":75},[212,425,426],{},[63,427,226],{"href":80},[212,429,430],{},[63,431,432],{"href":70},"Rat-holing",[212,434,435],{},[63,436,438],{"href":437},"\u002Fglossary\u002Fmass-flow-vs-funnel-flow","Mass flow vs funnel flow",[212,440,441],{},[63,442,118],{"href":117},{"title":246,"searchDepth":247,"depth":247,"links":444},[445,446,447,448],{"id":300,"depth":247,"text":301},{"id":328,"depth":247,"text":329},{"id":346,"depth":247,"text":347},{"id":206,"depth":247,"text":207},"Bridging (also arching or arch formation) is the formation of a stable mechanical arch of bulk-solid material above the discharge outlet of a hopper or silo. Once a bridge forms, no material flows out of the outlet even though the vessel above is full. Bridging is the universal failure mode of bulk-solids storage.",{},[76,81,71,452,259],"mass-flow-vs-funnel-flow",{"title":454,"description":455},"Bridging — stable arch above the discharge of a hopper or silo","Bridging (also arching) is the formation of a stable arch of bulk solids above the discharge outlet of a hopper or silo, stopping material flow. The universal failure mode of bulk-solids storage.",[457,460],{"title":458,"url":459},"Powder & Bulk Solids — Preventing Rat-Holing and Bridging in Powder Silos","https:\u002F\u002Fsgsystemsglobal.com\u002Fglossary\u002Fsilo-rat-holing-and-bridging\u002F",{"title":461,"url":462},"Accendo Reliability — Bridging in Silos and Hoppers","https:\u002F\u002Faccendoreliability.com\u002Fbridging-silos-hoppers\u002F","glossary\u002Fbridging","Bridging (bulk-solids)","qG-iJwvR3z5_NliCxfeui3lEL9wxjVY3kU3rO9JWn8g",{"id":467,"title":221,"aliases":468,"body":472,"category":252,"description":601,"extension":254,"meta":602,"navigation":256,"path":75,"relatedTerms":603,"seo":606,"sources":609,"stem":611,"term":221,"__hash__":612},"glossary\u002Fglossary\u002Fhopper.md",[469,470,471],"hoppers","storage hopper","process hopper",{"type":53,"value":473,"toc":596},[474,505,509,540,544,560,562],[56,475,476,477,479,480,67,484,67,488,67,492,496,497,67,501,504],{},"A ",[59,478,76],{}," is an inverted-pyramid or conical vessel designed to store bulk solids and discharge them through a converging outlet. Hoppers appear under ",[63,481,483],{"href":482},"\u002Fglossary\u002Felectrostatic-precipitator","ESPs",[63,485,487],{"href":486},"\u002Fglossary\u002Fbaghouse","baghouses",[63,489,491],{"href":490},"\u002Fglossary\u002Feconomiser","economisers",[63,493,495],{"href":494},"\u002Fglossary\u002Fair-heater","air heaters"," and process equipment of every kind across cement, power, ",[63,498,500],{"href":499},"\u002Fglossary\u002Fwaste-to-energy","WtE",[63,502,503],{"href":499},"biomass",", refining, pharma, food and mining.",[84,506,508],{"id":507},"universal-failure-modes","Universal failure modes",[209,510,511,518,525,531],{},[212,512,513,517],{},[59,514,515],{},[63,516,216],{"href":65}," — stable arch forms above the outlet",[212,519,520,524],{},[59,521,522],{},[63,523,432],{"href":70}," — narrow channel above the outlet; surrounding material packs and hardens",[212,526,527,530],{},[59,528,529],{},"Pluggage"," — total blockage that stops discharge",[212,532,533,539],{},[59,534,535,536],{},"Funnel flow vs ",[63,537,538],{"href":437},"mass flow"," — first-in, last-out behaviour leading to ageing material remaining indefinitely",[84,541,543],{"id":542},"why-acoustic-cleaning-works-on-hoppers","Why acoustic cleaning works on hoppers",[56,545,546,549,550,67,553,67,556,559],{},[63,547,548],{"href":117},"Sonic horns"," excel on hoppers because the geometry is small enough for the sound wave to fill the whole vessel and the dust is dry and friable. Compared with mechanical alternatives — ",[63,551,552],{"href":145},"bin vibrators",[63,554,555],{"href":131},"air cannons",[63,557,558],{"href":173},"whip hammers"," — they cause no structural stress, no fatigue, and no impact damage to the hopper itself.",[84,561,207],{"id":206},[209,563,564,568,574,580,584,588,592],{},[212,565,566],{},[63,567,226],{"href":80},[212,569,570],{},[63,571,573],{"href":572},"\u002Fglossary\u002Fbunker-coal-bunker","Bunker \u002F coal bunker",[212,575,576],{},[63,577,579],{"href":578},"\u002Fglossary\u002Fbin","Bin",[212,581,582],{},[63,583,216],{"href":65},[212,585,586],{},[63,587,432],{"href":70},[212,589,590],{},[63,591,438],{"href":437},[212,593,594],{},[63,595,118],{"href":117},{"title":246,"searchDepth":247,"depth":247,"links":597},[598,599,600],{"id":507,"depth":247,"text":508},{"id":542,"depth":247,"text":543},{"id":206,"depth":247,"text":207},"A hopper is an inverted-pyramid or conical vessel designed to store bulk solids and discharge them through a converging outlet. Hoppers appear under ESPs, baghouses, economisers, air heaters and process equipment of every kind across cement, power, WtE, biomass, refining, pharma, food and mining.",{},[81,604,605,66,71,452,259],"bunker-coal-bunker","bin",{"title":607,"description":608},"Hopper — converging vessel for storing and discharging bulk solids","A hopper is an inverted-pyramid or conical vessel for storing and discharging bulk solids. Bridging and rat-holing are the universal failure modes; sonic horns are a clean, low-maintenance remedy.",[610],{"title":268,"url":269},"glossary\u002Fhopper","yaS0yQSinQlli40xEUR0l9zzxphPNmE4Pi2XHYeAc4k",{"id":614,"title":226,"aliases":615,"body":618,"category":252,"description":702,"extension":254,"meta":703,"navigation":256,"path":80,"relatedTerms":704,"seo":705,"sources":708,"stem":712,"term":226,"__hash__":713},"glossary\u002Fglossary\u002Fsilo.md",[616,617],"silos","storage silo",{"type":53,"value":619,"toc":697},[620,628,632,641,645,650,659,673,675],[56,621,476,622,624,625,627],{},[59,623,81],{}," is a large vertical vessel for storing bulk solids — cement, fly ash, lime, ",[63,626,503],{"href":499}," pellets, fertilizer granules, food powders, mining concentrate. Silos range from a few cubic metres to tens of thousands of cubic metres and are typically cylindrical with a conical discharge bottom feeding into a single outlet or a cluster of outlets.",[84,629,631],{"id":630},"why-silos-bridge","Why silos bridge",[56,633,634,635,637,638,640],{},"Most bulk solids show some degree of cohesion. Under the gravitational load of metres of stored material, the cohesive bond is enough to form a stable arch above the discharge outlet (",[63,636,66],{"href":65},") or a narrow flow channel surrounded by a hardened mass (",[63,639,71],{"href":70},"). The longer material sits in the silo, the more it consolidates and the harder it is to restart flow.",[84,642,644],{"id":643},"sonic-horns-as-flow-aids","Sonic horns as flow aids",[56,646,647,649],{},[63,648,548],{"href":117}," installed at the silo discharge cone provide continuous low-amplitude vibration that prevents cohesive structures from forming. A single horn typically covers the discharge cone and the lower 2–5 metres of the silo wall. Multiple horns address larger silos or persistent rat-holing zones.",[56,651,652,653,655,656,658],{},"Compared with ",[63,654,555],{"href":131}," and ",[63,657,552],{"href":145},":",[209,660,661,664,667,670],{},[212,662,663],{},"No structural impact on the silo",[212,665,666],{},"No discrete blast moments that introduce air pockets into the discharge",[212,668,669],{},"Lower total air consumption per unit cleaning effort",[212,671,672],{},"Single mounting versus arrays of cannons",[84,674,207],{"id":206},[209,676,677,681,685,689,693],{},[212,678,679],{},[63,680,221],{"href":75},[212,682,683],{},[63,684,573],{"href":572},[212,686,687],{},[63,688,216],{"href":65},[212,690,691],{},[63,692,432],{"href":70},[212,694,695],{},[63,696,118],{"href":117},{"title":246,"searchDepth":247,"depth":247,"links":698},[699,700,701],{"id":630,"depth":247,"text":631},{"id":643,"depth":247,"text":644},{"id":206,"depth":247,"text":207},"A silo is a large vertical vessel for storing bulk solids — cement, fly ash, lime, biomass pellets, fertilizer granules, food powders, mining concentrate. Silos range from a few cubic metres to tens of thousands of cubic metres and are typically cylindrical with a conical discharge bottom feeding into a single outlet or a cluster of outlets.",{},[76,604,66,71,259],{"title":706,"description":707},"Silo — large vertical storage vessel for bulk solids","A silo is a large vertical bulk-solids storage vessel. Cement, fly-ash, lime, biomass, fertilizer and food-powder silos all bridge and rat-hole; sonic horns are the leading flow aid.",[709],{"title":710,"url":711},"Wikipedia — Silo","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FSilo","glossary\u002Fsilo","h1FnwqisFv53zNO36e7ZXskU_lfE0pCFuFSmOPzPKJ0",{"id":715,"title":118,"aliases":716,"body":720,"category":918,"description":919,"extension":254,"meta":920,"navigation":256,"path":117,"relatedTerms":921,"seo":928,"sources":931,"stem":941,"term":118,"__hash__":942},"glossary\u002Fglossary\u002Fsonic-horn.md",[717,718,719],"sonic horns","sonic cleaning horn","industrial sonic horn",{"type":53,"value":721,"toc":911},[722,750,754,762,766,828,832,867,871,879,881],[56,723,476,724,727,728,732,733,67,735,67,738,67,742,655,746,749],{},[59,725,726],{},"sonic horn"," is a pneumatically-driven sound emitter that produces high-intensity, low-frequency sound waves — typically between 60 and 400 Hz at sound pressure levels of 140 to 180 dB — used to dislodge particulate fouling from inside industrial process equipment. Sonic horns are the most common form of ",[63,729,731],{"href":730},"\u002Fglossary\u002Facoustic-cleaner","acoustic cleaner"," and the default specification for cleaning ",[63,734,483],{"href":482},[63,736,487],{"href":737},"\u002Fglossary\u002Ffabric-filter",[63,739,741],{"href":740},"\u002Fglossary\u002Fselective-catalytic-reduction","SCR catalysts",[63,743,745],{"href":744},"\u002Fglossary\u002Fsuperheater","boiler heat-transfer surfaces",[63,747,748],{"href":75},"hoppers and silos",".",[84,751,753],{"id":752},"how-a-sonic-horn-works","How a sonic horn works",[56,755,756,757,761],{},"Compressed plant air admitted through a ",[63,758,760],{"href":759},"\u002Fglossary\u002Fsolenoid-valve","solenoid valve"," drives a metal diaphragm — typically titanium or 316 stainless — into resonant oscillation at the horn's fundamental frequency. The oscillating pressure field is amplified by an exponential bell horn and projected into the vessel as a near-spherical sound wave. Particulate already deposited on internal surfaces receives an oscillating acceleration that overcomes adhesion; loosened material is then carried out with the gas flow before it can sinter, bridge or bond. Because the cleaning is acoustic and non-contact, the horn can fire while the plant is online without tube erosion, refractory damage or thermal shock.",[84,763,765],{"id":764},"key-parameters","Key parameters",[89,767,768,778],{},[92,769,770],{},[95,771,772,775],{},[98,773,774],{},"Parameter",[98,776,777],{},"Typical range",[108,779,780,788,796,804,812,820],{},[95,781,782,785],{},[113,783,784],{},"Fundamental frequency",[113,786,787],{},"60–400 Hz",[95,789,790,793],{},[113,791,792],{},"Sound pressure level",[113,794,795],{},"140–180 dB",[95,797,798,801],{},[113,799,800],{},"Compressed-air consumption",[113,802,803],{},"8–14 Nm³\u002Fmin at 4–7 bar",[95,805,806,809],{},[113,807,808],{},"Operating temperature (with appropriate materials)",[113,810,811],{},"−40 °C to +500 °C",[95,813,814,817],{},[113,815,816],{},"Firing cycle",[113,818,819],{},"5–15 s burst, repeated every 3–15 minutes",[95,821,822,825],{},[113,823,824],{},"Mass",[113,826,827],{},"15–60 kg depending on horn size",[84,829,831],{"id":830},"frequency-selection","Frequency selection",[56,833,834,835,67,839,843,844,67,848,850,851,67,854,858,859,655,863,749],{},"Lower frequencies (60–125 Hz) project longer wavelengths and penetrate further into large open vessels — ",[63,836,838],{"href":837},"\u002Fglossary\u002Fpreheater-cyclone","preheater cyclones",[63,840,842],{"href":841},"\u002Fglossary\u002Frecovery-boiler","recovery-boiler superheaters",", large ",[63,845,847],{"href":846},"\u002Fglossary\u002Fesp-field-bus-section","ESP fields",[63,849,616],{"href":80},". Higher frequencies (230–400 Hz) carry more energy per unit volume and suit finer dust loads in ",[63,852,853],{"href":737},"fabric-filter compartments",[63,855,857],{"href":856},"\u002Fglossary\u002Fhoneycomb-catalyst","catalyst layers"," and smaller hopper geometries. See ",[63,860,862],{"href":861},"\u002Fglossary\u002Flow-frequency-acoustic-cleaner","low-frequency acoustic cleaner",[63,864,866],{"href":865},"\u002Fglossary\u002Fhigh-frequency-acoustic-cleaner","high-frequency acoustic cleaner",[84,868,870],{"id":869},"sonic-horn-vs-steam-sootblower","Sonic horn vs steam sootblower",[56,872,873,874,878],{},"Sonic horns are increasingly specified alongside or in place of ",[63,875,877],{"href":876},"\u002Fglossary\u002Fsteam-sootblower","steam sootblowers"," because they consume no boiler-grade steam, cause no tube erosion, require almost no moving parts and can fire every few minutes without operator intervention. They are less effective on hard, fused slag than retractable steam lances, so on furnace waterwalls and high-temperature superheaters they typically complement rather than replace mechanical cleaning.",[84,880,207],{"id":206},[209,882,883,888,894,900,906],{},[212,884,885],{},[63,886,887],{"href":730},"Acoustic cleaner",[212,889,890],{},[63,891,893],{"href":892},"\u002Fglossary\u002Fsonic-sootblower","Sonic sootblower",[212,895,896],{},[63,897,899],{"href":898},"\u002Fglossary\u002Fbell-horn","Bell horn",[212,901,902],{},[63,903,905],{"href":904},"\u002Fglossary\u002Fdiaphragm-horn","Diaphragm horn",[212,907,908],{},[63,909,910],{"href":861},"Low-frequency acoustic cleaner",{"title":246,"searchDepth":247,"depth":247,"links":912},[913,914,915,916,917],{"id":752,"depth":247,"text":753},{"id":764,"depth":247,"text":765},{"id":830,"depth":247,"text":831},{"id":869,"depth":247,"text":870},{"id":206,"depth":247,"text":207},"core-technology","A sonic horn is a pneumatically-driven sound emitter that produces high-intensity, low-frequency sound waves — typically between 60 and 400 Hz at sound pressure levels of 140 to 180 dB — used to dislodge particulate fouling from inside industrial process equipment. Sonic horns are the most common form of acoustic cleaner and the default specification for cleaning ESPs, baghouses, SCR catalysts, boiler heat-transfer surfaces and hoppers and silos.",{},[922,923,924,925,926,927],"acoustic-cleaner","acoustic-cleaning-system","sonic-sootblower","bell-horn","diaphragm-horn","low-frequency-acoustic-cleaner",{"title":929,"description":930},"Sonic horn — definition, frequency, SPL and industrial applications","A sonic horn is a pneumatically-driven low-frequency sound emitter (typically 60–400 Hz at 140–180 dB SPL) used to dislodge particulate fouling from boilers, ESPs, baghouses and process vessels.",[932,935,938],{"title":933,"url":934},"Power Engineering — Sonic Horns: A User's Introduction","https:\u002F\u002Fwww.power-eng.com\u002Fcoal\u002Fsonic-horns-a-userrsquos-introduction\u002F",{"title":936,"url":937},"Power Engineering — Tuning in to Acoustic Cleaning","https:\u002F\u002Fwww.power-eng.com\u002Fcoal\u002Ftuning-in-to-acoustic-cleaning\u002F",{"title":939,"url":940},"Wikipedia — Sonic soot blowers","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FSonic_soot_blowers","glossary\u002Fsonic-horn","YzrhN0kKzqSaQo0wfn0rueNZ-V43mcg5zahqeWi3lnU",{"id":944,"title":945,"aliases":946,"body":950,"category":252,"description":1072,"extension":254,"meta":1073,"navigation":256,"path":131,"relatedTerms":1074,"seo":1076,"sources":1079,"stem":1083,"term":377,"__hash__":1084},"glossary\u002Fglossary\u002Fair-cannon-air-blaster.md","Air cannon (air blaster)",[947,555,948,949],"air blaster","air blasters","pneumatic blaster",{"type":53,"value":951,"toc":1067},[952,969,973,1027,1031,1036,1039,1041],[56,953,954,955,286,958,960,961,67,963,965,966,968],{},"An ",[59,956,957],{},"air cannon",[59,959,947],{},") is a pressure-vessel and quick-release-valve assembly that fires a brief high-pressure air pulse — typically 5–7 bar from a 30–150 litre reservoir — through a nozzle directed into a ",[63,962,76],{"href":75},[63,964,81],{"href":80}," or duct. The pulse disrupts material bridges and dislodges build-up. Air cannons are widely deployed in cement plants, coal-fired power plants, ",[63,967,500],{"href":499}," plants and bulk-handling installations.",[84,970,972],{"id":971},"strengths-and-weaknesses","Strengths and weaknesses",[89,974,975,985],{},[92,976,977],{},[95,978,979,982],{},[98,980,981],{},"Strength",[98,983,984],{},"Weakness",[108,986,987,995,1003,1011,1019],{},[95,988,989,992],{},[113,990,991],{},"Very high instantaneous energy",[113,993,994],{},"Causes documented structural stress and fatigue",[95,996,997,1000],{},[113,998,999],{},"Effective on consolidated bridges",[113,1001,1002],{},"Discrete pulses leave time for bridges to re-form",[95,1004,1005,1008],{},[113,1006,1007],{},"Established technology, broad supplier base",[113,1009,1010],{},"Episodic high air consumption",[95,1012,1013,1016],{},[113,1014,1015],{},"Targets specific build-up zones",[113,1017,1018],{},"Requires array of cannons for large silos",[95,1020,1021,1024],{},[113,1022,1023],{},"Tolerates high temperature",[113,1025,1026],{},"Pulse can disturb downstream flow control",[84,1028,1030],{"id":1029},"air-cannon-vs-sonic-horn","Air cannon vs sonic horn",[56,1032,1033,1035],{},[63,1034,548],{"href":117}," compete directly with air cannons across most flow-aid duty. Sonic horns favour: continuous prevention over periodic remediation, non-contact operation, single-unit coverage of an entire vessel, and zero structural stress on the vessel itself. Air cannons favour: very hard consolidated bridges and applications where the higher impact energy is decisive.",[56,1037,1038],{},"Many real installations use both: sonic horns for continuous prevention, with a small number of strategically-placed air cannons reserved for restart after extended shutdowns or to break unusually-hard bridges.",[84,1040,207],{"id":206},[209,1042,1043,1047,1051,1055,1059,1063],{},[212,1044,1045],{},[63,1046,47],{"href":257},[212,1048,1049],{},[63,1050,221],{"href":75},[212,1052,1053],{},[63,1054,226],{"href":80},[212,1056,1057],{},[63,1058,573],{"href":572},[212,1060,1061],{},[63,1062,146],{"href":145},[212,1064,1065],{},[63,1066,118],{"href":117},{"title":246,"searchDepth":247,"depth":247,"links":1068},[1069,1070,1071],{"id":971,"depth":247,"text":972},{"id":1029,"depth":247,"text":1030},{"id":206,"depth":247,"text":207},"An air cannon (also air blaster) is a pressure-vessel and quick-release-valve assembly that fires a brief high-pressure air pulse — typically 5–7 bar from a 30–150 litre reservoir — through a nozzle directed into a hopper, silo or duct. The pulse disrupts material bridges and dislodges build-up. Air cannons are widely deployed in cement plants, coal-fired power plants, WtE plants and bulk-handling installations.",{},[1075,76,81,604,261,259],"anti-bridging-device",{"title":1077,"description":1078},"Air cannon (air blaster) — high-pressure pneumatic flow aid","An air cannon is a pressure-vessel and quick-release-valve assembly that fires a brief high-pressure air pulse into a hopper or silo to break material bridges. Effective but causes structural stress.",[1080],{"title":1081,"url":1082},"AIRMATIC — Pneumatic Flow Aids","https:\u002F\u002Fwww.airmatic.com\u002Fproducts\u002Fnon-vibrating-pneumatic-flow-aid-devices","glossary\u002Fair-cannon-air-blaster","dmkNwfGlExr24ojIjBj-pqOS-BKrpqYy5kRaGXnWOmw",{"id":1086,"title":146,"aliases":1087,"body":1091,"category":252,"description":1268,"extension":254,"meta":1269,"navigation":256,"path":145,"relatedTerms":1270,"seo":1271,"sources":1274,"stem":1276,"term":146,"__hash__":1277},"glossary\u002Fglossary\u002Fbin-vibrator.md",[1088,1089,1090],"pneumatic vibrator","electric vibrator","silo vibrator",{"type":53,"value":1092,"toc":1262},[1093,1110,1114,1134,1138,1164,1168,1238,1240],[56,1094,476,1095,1098,1099,67,1101,77,1103,1105,1106,1109],{},[59,1096,1097],{},"bin vibrator"," is a pneumatic or electric vibrator mounted on the outside of a ",[63,1100,76],{"href":75},[63,1102,81],{"href":80},[63,1104,605],{"href":578}," to dislodge bulk-solids ",[63,1107,1108],{"href":65},"bridges"," by transmitting vibration through the vessel wall into the material inside. Bin vibrators are compact, inexpensive and the dominant flow aid on small storage vessels.",[84,1111,1113],{"id":1112},"types","Types",[209,1115,1116,1122,1128],{},[212,1117,1118,1121],{},[59,1119,1120],{},"Pneumatic ball or turbine vibrators"," — compressed-air driven; ATEX-compatible variants available",[212,1123,1124,1127],{},[59,1125,1126],{},"Electric rotary vibrators"," — eccentric-mass motors; higher continuous force; require ATEX rating for combustible-dust service",[212,1129,1130,1133],{},[59,1131,1132],{},"Linear vibrators"," — for specific directional excitation",[84,1135,1137],{"id":1136},"limitations","Limitations",[209,1139,1140,1146,1152,1158],{},[212,1141,1142,1145],{},[59,1143,1144],{},"Material compaction risk"," — sustained vibration can densify wet or cohesive powders into a harder bridge, making the problem worse",[212,1147,1148,1151],{},[59,1149,1150],{},"Vessel fatigue"," — vibration transmits into the vessel structure; long-term stress concentrations at welds",[212,1153,1154,1157],{},[59,1155,1156],{},"Localised effect"," — vibrator energy diminishes rapidly with distance from the mounting point",[212,1159,1160,1163],{},[59,1161,1162],{},"Noise exposure"," — pneumatic vibrators are loud",[84,1165,1167],{"id":1166},"vibrator-vs-sonic-horn","Vibrator vs sonic horn",[89,1169,1170,1183],{},[92,1171,1172],{},[95,1173,1174,1177,1179],{},[98,1175,1176],{},"Attribute",[98,1178,146],{},[98,1180,1181],{},[63,1182,118],{"href":117},[108,1184,1185,1196,1207,1217,1228],{},[95,1186,1187,1190,1193],{},[113,1188,1189],{},"Contact with vessel",[113,1191,1192],{},"Direct (bolted)",[113,1194,1195],{},"None",[95,1197,1198,1201,1204],{},[113,1199,1200],{},"Effect on material",[113,1202,1203],{},"Vibrates \u002F can compact",[113,1205,1206],{},"Vibrates without compaction",[95,1208,1209,1211,1214],{},[113,1210,1150],{},[113,1212,1213],{},"Yes",[113,1215,1216],{},"No",[95,1218,1219,1222,1225],{},[113,1220,1221],{},"Coverage from one unit",[113,1223,1224],{},"Local to mounting",[113,1226,1227],{},"Whole-vessel acoustic field",[95,1229,1230,1232,1235],{},[113,1231,106],{},[113,1233,1234],{},"Small bins, dry granular",[113,1236,1237],{},"Most powders, retrofit-friendly",[84,1239,207],{"id":206},[209,1241,1242,1246,1250,1254,1258],{},[212,1243,1244],{},[63,1245,47],{"href":257},[212,1247,1248],{},[63,1249,221],{"href":75},[212,1251,1252],{},[63,1253,226],{"href":80},[212,1255,1256],{},[63,1257,132],{"href":131},[212,1259,1260],{},[63,1261,118],{"href":117},{"title":246,"searchDepth":247,"depth":247,"links":1263},[1264,1265,1266,1267],{"id":1112,"depth":247,"text":1113},{"id":1136,"depth":247,"text":1137},{"id":1166,"depth":247,"text":1167},{"id":206,"depth":247,"text":207},"A bin vibrator is a pneumatic or electric vibrator mounted on the outside of a hopper, silo or bin to dislodge bulk-solids bridges by transmitting vibration through the vessel wall into the material inside. Bin vibrators are compact, inexpensive and the dominant flow aid on small storage vessels.",{},[1075,76,81,260,259],{"title":1272,"description":1273},"Bin vibrator — pneumatic or electric vibrator mounted on a hopper or silo","A bin vibrator is a pneumatic or electric vibrator bolted to the outside of a hopper or silo to dislodge bulk-solids bridges. Compact but can compact wet powders and stress the vessel.",[1275],{"title":268,"url":269},"glossary\u002Fbin-vibrator","0Jin7iCBBYwjO_Es1cHtZFGOHXIoGzCW6keO56izMSE",{"id":1279,"title":244,"aliases":1280,"body":1284,"category":252,"description":1426,"extension":254,"meta":1427,"navigation":256,"path":243,"relatedTerms":1428,"seo":1429,"sources":1432,"stem":1435,"term":244,"__hash__":1436},"glossary\u002Fglossary\u002Fmaterial-flow-promotion.md",[1281,1282,1283],"flow promotion","bulk-solids flow promotion","silo flow aid",{"type":53,"value":1285,"toc":1421},[1286,1291,1295,1383,1387,1401,1403],[56,1287,1288,1290],{},[59,1289,244],{}," is the engineering discipline of keeping bulk solids moving reliably out of storage and process vessels. It covers the original design decisions — hopper geometry, outlet sizing, wall finish — and the retrofit equipment used when those decisions fall short.",[84,1292,1294],{"id":1293},"the-flow-promotion-toolkit","The flow-promotion toolkit",[89,1296,1297,1307],{},[92,1298,1299],{},[95,1300,1301,1304],{},[98,1302,1303],{},"Tool",[98,1305,1306],{},"Best application",[108,1308,1309,1321,1328,1336,1345,1355,1365,1375],{},[95,1310,1311,1318],{},[113,1312,1313,1314],{},"Steeper ",[63,1315,1317],{"href":1316},"\u002Fglossary\u002Fdischarge-cone","discharge cone",[113,1319,1320],{},"Designed-in, hard to retrofit",[95,1322,1323,1326],{},[113,1324,1325],{},"Smoother wall finish",[113,1327,1320],{},[95,1329,1330,1333],{},[113,1331,1332],{},"Larger outlet",[113,1334,1335],{},"Designed-in, sometimes retrofittable",[95,1337,1338,1342],{},[113,1339,1340],{},[63,1341,548],{"href":117},[113,1343,1344],{},"Most powders; continuous prevention; retrofit-friendly",[95,1346,1347,1352],{},[113,1348,1349],{},[63,1350,1351],{"href":131},"Air cannons",[113,1353,1354],{},"Hard bridges; periodic remediation",[95,1356,1357,1362],{},[113,1358,1359],{},[63,1360,1361],{"href":145},"Bin vibrators",[113,1363,1364],{},"Small bins; dry granular",[95,1366,1367,1372],{},[113,1368,1369],{},[63,1370,1371],{"href":159},"Fluidisation pads",[113,1373,1374],{},"Dry Class-A powders",[95,1376,1377,1380],{},[113,1378,1379],{},"Mechanical extractor (screw, drag chain)",[113,1381,1382],{},"Continuous high-flow duty",[84,1384,1386],{"id":1385},"why-flow-promotion-rather-than-bridge-breaking","Why \"flow promotion\" rather than \"bridge breaking\"",[56,1388,1389,1390,1393,1394,1397,1398,1400],{},"The vocabulary matters. ",[288,1391,1392],{},"Bridge breaking"," is reactive — addressing an existing problem. ",[288,1395,1396],{},"Flow promotion"," is preventive — keeping material moving before bridges can form. Modern industrial practice has shifted from the former to the latter, which is one of the reasons continuous-operation devices (",[63,1399,717],{"href":117},", fluidisation pads) are displacing periodic devices (air cannons, manual hammering).",[84,1402,207],{"id":206},[209,1404,1405,1409,1413,1417],{},[212,1406,1407],{},[63,1408,47],{"href":257},[212,1410,1411],{},[63,1412,221],{"href":75},[212,1414,1415],{},[63,1416,226],{"href":80},[212,1418,1419],{},[63,1420,118],{"href":117},{"title":246,"searchDepth":247,"depth":247,"links":1422},[1423,1424,1425],{"id":1293,"depth":247,"text":1294},{"id":1385,"depth":247,"text":1386},{"id":206,"depth":247,"text":207},"Material flow promotion is the engineering discipline of keeping bulk solids moving reliably out of storage and process vessels. It covers the original design decisions — hopper geometry, outlet sizing, wall finish — and the retrofit equipment used when those decisions fall short.",{},[1075,76,81,259],{"title":1430,"description":1431},"Material flow promotion — the discipline of keeping bulk solids flowing","Material flow promotion covers the design and equipment choices that keep bulk solids moving reliably out of storage and process vessels. Sonic horns are an increasingly common solution.",[1433],{"title":1434,"url":459},"Powder & Bulk Solids — Preventing Rat-Holing and Bridging","glossary\u002Fmaterial-flow-promotion","RmnoJjnShpLbgnOLJn6pW9VoKMTd1X5i1fJCZJViup4",1782613739622]