[{"data":1,"prerenderedAt":822},["ShallowReactive",2],{"site-footer-common":3,"glossary:solenoid-valve":45,"glossary-related:solenoid-valve":194},{"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":173,"description":174,"extension":175,"meta":176,"navigation":177,"path":178,"relatedTerms":179,"seo":184,"sources":187,"stem":191,"term":192,"__hash__":193},"glossary\u002Fglossary\u002Fsolenoid-valve.md","Solenoid valve",[49,50,51],"pilot valve","sonic horn solenoid","quick-exhaust valve",{"type":53,"value":54,"toc":166},"minimark",[55,80,85,88,131,135,138,142],[56,57,58,59,63,64,69,70,74,75,79],"p",{},"A ",[60,61,62],"strong",{},"solenoid valve"," is the electrically-actuated pilot device that admits compressed air to a ",[65,66,68],"a",{"href":67},"\u002Fglossary\u002Fsonic-horn","sonic horn"," on command from the ",[65,71,73],{"href":72},"\u002Fglossary\u002Fcycle-controller-sequencer","cycle controller",". The valve opens for the programmed pulse duration (typically 5–15 seconds), letting plant air at 4–7 bar drive the horn's ",[65,76,78],{"href":77},"\u002Fglossary\u002Fdiaphragm-horn","diaphragm"," into resonant oscillation. When the valve closes, the air supply is cut and the horn falls silent until the next pulse.",[81,82,84],"h2",{"id":83},"specification","Specification",[56,86,87],{},"For most industrial sonic-horn installations, the solenoid valve is:",[89,90,91,107,113,119,125],"ul",{},[92,93,94,106],"li",{},[60,95,96,100,101,105],{},[65,97,99],{"href":98},"\u002Fglossary\u002Fatex-directive","ATEX"," \u002F ",[65,102,104],{"href":103},"\u002Fglossary\u002Fiecex","IECEx"," certified"," for the local hazardous-area classification",[92,108,109,112],{},[60,110,111],{},"Sized"," for the horn's peak airflow (8–14 Nm³\u002Fmin typical)",[92,114,115,118],{},[60,116,117],{},"Quick-exhaust"," type, to allow rapid pressure drop at the end of each pulse",[92,120,121,124],{},[60,122,123],{},"Voltage-rated"," for the site's instrument-control voltage (typically 24 VDC or 110\u002F230 VAC)",[92,126,127,130],{},[60,128,129],{},"IP65 or IP66"," weatherproof if mounted externally",[81,132,134],{"id":133},"wear-and-replacement","Wear and replacement",[56,136,137],{},"The solenoid valve is the most-replaced wear part on the periphery of an industrial sonic horn — typical service life of 1–3 years before coil or seat replacement. Routine inclusion in the spares package is standard practice.",[81,139,141],{"id":140},"related-terms","Related terms",[89,143,144,149,155,160],{},[92,145,146],{},[65,147,148],{"href":67},"Sonic horn",[92,150,151],{},[65,152,154],{"href":153},"\u002Fglossary\u002Fpneumatic-acoustic-cleaner","Pneumatic acoustic cleaner",[92,156,157],{},[65,158,159],{"href":72},"Cycle controller \u002F sequencer",[92,161,162],{},[65,163,165],{"href":164},"\u002Fglossary\u002Fcompressed-air","Compressed air",{"title":167,"searchDepth":168,"depth":168,"links":169},"",2,[170,171,172],{"id":83,"depth":168,"text":84},{"id":133,"depth":168,"text":134},{"id":140,"depth":168,"text":141},"controls-ancillaries","A solenoid valve is the electrically-actuated pilot device that admits compressed air to a sonic horn on command from the cycle controller. The valve opens for the programmed pulse duration (typically 5–15 seconds), letting plant air at 4–7 bar drive the horn's diaphragm into resonant oscillation. When the valve closes, the air supply is cut and the horn falls silent until the next pulse.","md",{},true,"\u002Fglossary\u002Fsolenoid-valve",[180,181,182,183],"sonic-horn","pneumatic-acoustic-cleaner","cycle-controller-sequencer","compressed-air",{"title":185,"description":186},"Solenoid valve — pilot device admitting compressed air to a sonic horn","A solenoid valve admits compressed air to a sonic horn on command from the cycle controller. ATEX-certified for hazardous-area duty; the most-replaced wear part on the horn periphery.",[188],{"title":189,"url":190},"Wikipedia — Solenoid valve","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FSolenoid_valve","glossary\u002Fsolenoid-valve","Solenoid valve (sonic horn)","tnbJRZKTMd3ej1zC_EZhmQPur6F3Nr0xjBkvvPhElDk",[195,434,612,727],{"id":196,"title":148,"aliases":197,"body":201,"category":409,"description":410,"extension":175,"meta":411,"navigation":177,"path":67,"relatedTerms":412,"seo":419,"sources":422,"stem":432,"term":148,"__hash__":433},"glossary\u002Fglossary\u002Fsonic-horn.md",[198,199,200],"sonic horns","sonic cleaning horn","industrial sonic horn",{"type":53,"value":202,"toc":402},[203,236,240,246,250,318,322,359,363,371,373],[56,204,58,205,207,208,212,213,217,218,217,222,217,226,230,231,235],{},[60,206,68],{}," 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 ",[65,209,211],{"href":210},"\u002Fglossary\u002Facoustic-cleaner","acoustic cleaner"," and the default specification for cleaning ",[65,214,216],{"href":215},"\u002Fglossary\u002Felectrostatic-precipitator","ESPs",", ",[65,219,221],{"href":220},"\u002Fglossary\u002Ffabric-filter","baghouses",[65,223,225],{"href":224},"\u002Fglossary\u002Fselective-catalytic-reduction","SCR catalysts",[65,227,229],{"href":228},"\u002Fglossary\u002Fsuperheater","boiler heat-transfer surfaces"," and ",[65,232,234],{"href":233},"\u002Fglossary\u002Fhopper","hoppers and silos",".",[81,237,239],{"id":238},"how-a-sonic-horn-works","How a sonic horn works",[56,241,242,243,245],{},"Compressed plant air admitted through a ",[65,244,62],{"href":178}," 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.",[81,247,249],{"id":248},"key-parameters","Key parameters",[251,252,253,266],"table",{},[254,255,256],"thead",{},[257,258,259,263],"tr",{},[260,261,262],"th",{},"Parameter",[260,264,265],{},"Typical range",[267,268,269,278,286,294,302,310],"tbody",{},[257,270,271,275],{},[272,273,274],"td",{},"Fundamental frequency",[272,276,277],{},"60–400 Hz",[257,279,280,283],{},[272,281,282],{},"Sound pressure level",[272,284,285],{},"140–180 dB",[257,287,288,291],{},[272,289,290],{},"Compressed-air consumption",[272,292,293],{},"8–14 Nm³\u002Fmin at 4–7 bar",[257,295,296,299],{},[272,297,298],{},"Operating temperature (with appropriate materials)",[272,300,301],{},"−40 °C to +500 °C",[257,303,304,307],{},[272,305,306],{},"Firing cycle",[272,308,309],{},"5–15 s burst, repeated every 3–15 minutes",[257,311,312,315],{},[272,313,314],{},"Mass",[272,316,317],{},"15–60 kg depending on horn size",[81,319,321],{"id":320},"frequency-selection","Frequency selection",[56,323,324,325,217,329,333,334,217,338,342,343,217,346,350,351,230,355,235],{},"Lower frequencies (60–125 Hz) project longer wavelengths and penetrate further into large open vessels — ",[65,326,328],{"href":327},"\u002Fglossary\u002Fpreheater-cyclone","preheater cyclones",[65,330,332],{"href":331},"\u002Fglossary\u002Frecovery-boiler","recovery-boiler superheaters",", large ",[65,335,337],{"href":336},"\u002Fglossary\u002Fesp-field-bus-section","ESP fields",[65,339,341],{"href":340},"\u002Fglossary\u002Fsilo","silos",". Higher frequencies (230–400 Hz) carry more energy per unit volume and suit finer dust loads in ",[65,344,345],{"href":220},"fabric-filter compartments",[65,347,349],{"href":348},"\u002Fglossary\u002Fhoneycomb-catalyst","catalyst layers"," and smaller hopper geometries. See ",[65,352,354],{"href":353},"\u002Fglossary\u002Flow-frequency-acoustic-cleaner","low-frequency acoustic cleaner",[65,356,358],{"href":357},"\u002Fglossary\u002Fhigh-frequency-acoustic-cleaner","high-frequency acoustic cleaner",[81,360,362],{"id":361},"sonic-horn-vs-steam-sootblower","Sonic horn vs steam sootblower",[56,364,365,366,370],{},"Sonic horns are increasingly specified alongside or in place of ",[65,367,369],{"href":368},"\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.",[81,372,141],{"id":140},[89,374,375,380,386,392,397],{},[92,376,377],{},[65,378,379],{"href":210},"Acoustic cleaner",[92,381,382],{},[65,383,385],{"href":384},"\u002Fglossary\u002Fsonic-sootblower","Sonic sootblower",[92,387,388],{},[65,389,391],{"href":390},"\u002Fglossary\u002Fbell-horn","Bell horn",[92,393,394],{},[65,395,396],{"href":77},"Diaphragm horn",[92,398,399],{},[65,400,401],{"href":353},"Low-frequency acoustic cleaner",{"title":167,"searchDepth":168,"depth":168,"links":403},[404,405,406,407,408],{"id":238,"depth":168,"text":239},{"id":248,"depth":168,"text":249},{"id":320,"depth":168,"text":321},{"id":361,"depth":168,"text":362},{"id":140,"depth":168,"text":141},"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.",{},[413,414,415,416,417,418],"acoustic-cleaner","acoustic-cleaning-system","sonic-sootblower","bell-horn","diaphragm-horn","low-frequency-acoustic-cleaner",{"title":420,"description":421},"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.",[423,426,429],{"title":424,"url":425},"Power Engineering — Sonic Horns: A User's Introduction","https:\u002F\u002Fwww.power-eng.com\u002Fcoal\u002Fsonic-horns-a-userrsquos-introduction\u002F",{"title":427,"url":428},"Power Engineering — Tuning in to Acoustic Cleaning","https:\u002F\u002Fwww.power-eng.com\u002Fcoal\u002Ftuning-in-to-acoustic-cleaning\u002F",{"title":430,"url":431},"Wikipedia — Sonic soot blowers","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FSonic_soot_blowers","glossary\u002Fsonic-horn","YzrhN0kKzqSaQo0wfn0rueNZ-V43mcg5zahqeWi3lnU",{"id":435,"title":154,"aliases":436,"body":439,"category":409,"description":599,"extension":175,"meta":600,"navigation":177,"path":153,"relatedTerms":601,"seo":603,"sources":606,"stem":610,"term":154,"__hash__":611},"glossary\u002Fglossary\u002Fpneumatic-acoustic-cleaner.md",[437,438],"pneumatically driven acoustic cleaner","compressed-air sonic horn",{"type":53,"value":440,"toc":593},[441,453,457,460,503,507,552,556,568,570],[56,442,58,443,446,447,449,450,452],{},[60,444,445],{},"pneumatic acoustic cleaner"," is an industrial ",[65,448,68],{"href":67}," driven by compressed plant air rather than by an electrical, hydraulic or steam source. The pneumatic design dominates the industrial acoustic-cleaning market because it places no electrical parts inside the gas path, tolerates dirty utility air, and matches naturally to the ",[65,451,99],{"href":98}," Zone 20\u002F21\u002F22 dust environments where most cleaning targets sit.",[81,454,456],{"id":455},"why-pneumatic-not-electric","Why pneumatic, not electric",[56,458,459],{},"Industrial cleaning duty is dominated by three constraints that favour compressed air:",[461,462,463,487,493],"ol",{},[92,464,465,468,469,217,473,217,477,217,480,217,483,486],{},[60,466,467],{},"Hazardous-area classification."," Most cleaning targets — ",[65,470,472],{"href":471},"\u002Fglossary\u002Fbunker-coal-bunker","coal bunkers",[65,474,476],{"href":475},"\u002Fglossary\u002Ffly-ash-hopper","fly-ash hoppers",[65,478,479],{"href":340},"biomass silos",[65,481,482],{"href":327},"cement preheater cyclones",[65,484,485],{"href":331},"recovery boilers"," — are classified for combustible dust. A pneumatic driver removes electrical ignition risk entirely from the horn body.",[92,488,489,492],{},[60,490,491],{},"Utility availability."," Every industrial site already runs an instrument-air or plant-air network sized for sootblowers, pneumatic vibrators, control valves and tools. Adding sonic horns rarely requires a new utility.",[92,494,495,498,499,502],{},[60,496,497],{},"Tolerance."," Compressed industrial air contains water, oil mist and particulate; a metal ",[65,500,501],{"href":77},"diaphragm horn"," tolerates this far better than any electromechanical sound source of comparable output.",[81,504,506],{"id":505},"typical-utility-requirements","Typical utility requirements",[251,508,509,518],{},[254,510,511],{},[257,512,513,515],{},[260,514,84],{},[260,516,517],{},"Typical value",[267,519,520,528,536,544],{},[257,521,522,525],{},[272,523,524],{},"Supply pressure",[272,526,527],{},"4–7 bar (60–100 psi)",[257,529,530,533],{},[272,531,532],{},"Consumption per horn (10-second burst)",[272,534,535],{},"8–14 Nm³\u002Fmin",[257,537,538,541],{},[272,539,540],{},"Air quality",[272,542,543],{},"Dried instrument air preferred; plant air acceptable with adequate filtration",[257,545,546,549],{},[272,547,548],{},"Connection",[272,550,551],{},"DN25–DN50 thread or flange",[81,553,555],{"id":554},"what-pneumatic-implies-for-procurement","What \"pneumatic\" implies for procurement",[56,557,558,559,562,563,567],{},"Specifiers writing an RFQ for a pneumatic acoustic cleaner should also size the compressed-air receiver, the regulator and the pilot ",[65,560,561],{"href":178},"solenoid valves"," for the simultaneous-firing case. A common engineering error is to under-size the air receiver, leaving the horn unable to sustain its rated ",[65,564,566],{"href":565},"\u002Fglossary\u002Fsound-pressure-level","SPL"," during multi-horn cycles.",[81,569,141],{"id":140},[89,571,572,576,580,584,588],{},[92,573,574],{},[65,575,148],{"href":67},[92,577,578],{},[65,579,379],{"href":210},[92,581,582],{},[65,583,165],{"href":164},[92,585,586],{},[65,587,47],{"href":178},[92,589,590],{},[65,591,592],{"href":98},"ATEX directive",{"title":167,"searchDepth":168,"depth":168,"links":594},[595,596,597,598],{"id":455,"depth":168,"text":456},{"id":505,"depth":168,"text":506},{"id":554,"depth":168,"text":555},{"id":140,"depth":168,"text":141},"A pneumatic acoustic cleaner is an industrial sonic horn driven by compressed plant air rather than by an electrical, hydraulic or steam source. The pneumatic design dominates the industrial acoustic-cleaning market because it places no electrical parts inside the gas path, tolerates dirty utility air, and matches naturally to the ATEX Zone 20\u002F21\u002F22 dust environments where most cleaning targets sit.",{},[413,180,183,602,182],"solenoid-valve",{"title":604,"description":605},"Pneumatic acoustic cleaner — compressed-air sonic horn explained","A pneumatic acoustic cleaner is a sonic horn driven by compressed plant air. The pneumatic design dominates industrial acoustic cleaning because it has no electrical parts in the gas path.",[607],{"title":608,"url":609},"Power Magazine — The Theory and Application of Acoustic Cleaners","https:\u002F\u002Fwww.powermag.com\u002Fthe-theory-and-application-of-acoustic-cleaners\u002F","glossary\u002Fpneumatic-acoustic-cleaner","CmN6RQgE83lF1QmPn-rvEFRCZOGmpQqASpK3J82Tm18",{"id":613,"title":159,"aliases":614,"body":618,"category":173,"description":714,"extension":175,"meta":715,"navigation":177,"path":72,"relatedTerms":716,"seo":719,"sources":722,"stem":724,"term":725,"__hash__":726},"glossary\u002Fglossary\u002Fcycle-controller-sequencer.md",[615,73,616,617],"sequencer","horn sequencer","timer controller",{"type":53,"value":619,"toc":709},[620,640,644,682,686,689,691],[56,621,58,622,624,625,627,628,630,631,635,636,235],{},[60,623,73],{}," (or ",[60,626,615],{},") programmes the firing pattern of one or more ",[65,629,198],{"href":67}," — pulse duration, pulse interval, firing sequence across multiple horns, zone grouping, response to plant DCS signals. It can be either a dedicated standalone hardware unit or a subroutine inside the plant ",[65,632,634],{"href":633},"\u002Fglossary\u002Fplc","PLC"," or ",[65,637,639],{"href":638},"\u002Fglossary\u002Fdcs","DCS",[81,641,643],{"id":642},"programmable-parameters","Programmable parameters",[89,645,646,652,658,664,670,676],{},[92,647,648,651],{},[60,649,650],{},"Pulse duration"," — typically 5–15 s per burst",[92,653,654,657],{},[60,655,656],{},"Pulse interval"," — typically 3–15 minutes between pulses on the same horn",[92,659,660,663],{},[60,661,662],{},"Multi-horn sequencing"," — fire one horn at a time to manage compressed-air demand",[92,665,666,669],{},[60,667,668],{},"Zone grouping"," — separate cycles for hopper, plate area and penthouse zones",[92,671,672,675],{},[60,673,674],{},"Response to operator override"," — manual fire, manual silence, mode switching",[92,677,678,681],{},[60,679,680],{},"Alarm output"," — to flag a stuck valve, low air pressure or controller fault",[81,683,685],{"id":684},"standalone-vs-plc-integrated","Standalone vs PLC-integrated",[56,687,688],{},"A standalone cycle controller is simple, cheap and adequate for small installations. Larger multi-horn systems benefit from PLC integration with the plant DCS so horn sequencing can respond to operator commands and process conditions in real time.",[81,690,141],{"id":140},[89,692,693,697,701,705],{},[92,694,695],{},[65,696,148],{"href":67},[92,698,699],{},[65,700,47],{"href":178},[92,702,703],{},[65,704,634],{"href":633},[92,706,707],{},[65,708,639],{"href":638},{"title":167,"searchDepth":168,"depth":168,"links":710},[711,712,713],{"id":642,"depth":168,"text":643},{"id":684,"depth":168,"text":685},{"id":140,"depth":168,"text":141},"A cycle controller (or sequencer) programmes the firing pattern of one or more sonic horns — pulse duration, pulse interval, firing sequence across multiple horns, zone grouping, response to plant DCS signals. It can be either a dedicated standalone hardware unit or a subroutine inside the plant PLC or DCS.",{},[180,602,717,718],"plc","dcs",{"title":720,"description":721},"Cycle controller and sequencer — programmes the firing pattern of sonic horns","A cycle controller programmes the firing pattern of one or more sonic horns — duration, interval, sequence, zone grouping. Either a dedicated standalone unit or a PLC subroutine.",[723],{"title":424,"url":425},"glossary\u002Fcycle-controller-sequencer","Cycle controller and sequencer","6klk_97RNkmhc8P60Uc3bKCp37nVL231hEUySdF-XWQ",{"id":728,"title":165,"aliases":729,"body":733,"category":807,"description":808,"extension":175,"meta":809,"navigation":177,"path":164,"relatedTerms":810,"seo":812,"sources":815,"stem":819,"term":820,"__hash__":821},"glossary\u002Fglossary\u002Fcompressed-air.md",[730,731,732],"plant air","instrument air","compressed-air supply",{"type":53,"value":734,"toc":802},[735,740,754,763,767,778,782,785,787],[56,736,737,739],{},[60,738,165],{}," at industrial plants is delivered by an on-site compressed-air system at typical pressures of 4–10 bar. Two grades exist:",[89,741,742,748],{},[92,743,744,747],{},[60,745,746],{},"Plant air"," — general utility air; tolerant quality",[92,749,750,753],{},[60,751,752],{},"Instrument air"," — filtered and dried; for controls and precision devices",[56,755,756,759,760,762],{},[65,757,758],{"href":153},"Pneumatic acoustic cleaners"," tolerate plant air for most service but specifying instrument air or dried plant air improves ",[65,761,78],{"href":77}," life.",[81,764,766],{"id":765},"consumption","Consumption",[56,768,769,770,772,773,777],{},"A typical industrial ",[65,771,68],{"href":67}," consumes 8–14 Nm³\u002Fmin during a 5–15 second firing burst at 4–7 bar ",[65,774,776],{"href":775},"\u002Fglossary\u002Foperating-pressure","operating pressure",". On a 5-minute firing cycle this averages 0.3–1.0 Nm³\u002Fmin continuous draw per horn. Multi-horn arrays must be sized against the simultaneous-firing case.",[81,779,781],{"id":780},"air-receiver-and-regulation","Air receiver and regulation",[56,783,784],{},"A correctly-sized air receiver buffers the horn's pulse demand from the compressor. Under-sized receivers cause SPL drop-off during multi-horn firing — a common engineering error on initial installations.",[81,786,141],{"id":140},[89,788,789,793,798],{},[92,790,791],{},[65,792,154],{"href":153},[92,794,795],{},[65,796,797],{"href":775},"Operating pressure",[92,799,800],{},[65,801,47],{"href":178},{"title":167,"searchDepth":168,"depth":168,"links":803},[804,805,806],{"id":765,"depth":168,"text":766},{"id":780,"depth":168,"text":781},{"id":140,"depth":168,"text":141},"kpis-measurements","Compressed air at industrial plants is delivered by an on-site compressed-air system at typical pressures of 4–10 bar. Two grades exist:",{},[181,811,602],"operating-pressure",{"title":813,"description":814},"Compressed air — utility supply that drives industrial sonic horns","Compressed air at 4–7 bar from plant or instrument-air systems drives industrial sonic horns. Consumption typically 8–14 Nm³\u002Fmin during a firing burst.",[816],{"title":817,"url":818},"Wikipedia — Compressed air","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FCompressed_air","glossary\u002Fcompressed-air","Compressed air (industrial)","VK3MuZQNNI5xSm-qw2mupwMxEqfDJo8fJ7Y70fxO-UM",1782613732663]