[{"data":1,"prerenderedAt":523},["ShallowReactive",2],{"site-header-common":3,"site-footer-common":59,"site-navigation-common":86,"resources-blog:sonic-horn-compressed-air-requirements":113},{"id":4,"extension":5,"footer":6,"meta":50,"navbar":51,"stem":57,"__hash__":58},"common\u002Fcommon.yml","yml",{"tagline":7,"legalTitle":8,"cookieSettingsLabel":9,"links":10,"sections":11},"Acoustic cleaning intelligence for industrial fouling, soot, ash, dust and build-up.","Legal","Cookie preferences",[],[12,24,36,48],{"title":13,"links":14},"Product",[15,18,21],{"label":16,"to":17},"How it works","\u002F#how-it-works",{"label":19,"to":20},"Application fit","\u002F#fit",{"label":22,"to":23},"ROI calculator \u002F Coming soon","\u002F#economics",{"title":25,"links":26},"Applications",[27,30,33],{"label":28,"to":29},"Boilers and heat transfer","\u002Fapplications\u002Fboilers-heat-transfer",{"label":31,"to":32},"SCR catalyst cleaning","\u002Fapplications\u002Fscr-catalyst-cleaning",{"label":34,"to":35},"Dust collection","\u002Fapplications\u002Fdust-collection",{"title":37,"links":38},"Resources",[39,42,45],{"label":40,"to":41},"Blog","\u002Fresources\u002Fblog",{"label":43,"to":44},"Glossary","\u002Fglossary",{"label":46,"to":47},"Buyer's guide","\u002Fresources\u002Fblog\u002Facoustic-cleaning-system",{"title":8,"links":49},[],{},{"links":52,"action":56},[53,55],{"label":25,"to":54},"\u002F#applications",{"label":16,"to":17},{"label":22,"to":23},"common","rzKP9GVWGTSjN3RTtCIYeR1oX7iQIvlngM7hHP108rc",{"id":4,"extension":5,"footer":60,"meta":80,"navbar":81,"stem":57,"__hash__":58},{"tagline":7,"legalTitle":8,"cookieSettingsLabel":9,"links":61,"sections":62},[],[63,68,73,78],{"title":13,"links":64},[65,66,67],{"label":16,"to":17},{"label":19,"to":20},{"label":22,"to":23},{"title":25,"links":69},[70,71,72],{"label":28,"to":29},{"label":31,"to":32},{"label":34,"to":35},{"title":37,"links":74},[75,76,77],{"label":40,"to":41},{"label":43,"to":44},{"label":46,"to":47},{"title":8,"links":79},[],{},{"links":82,"action":85},[83,84],{"label":25,"to":54},{"label":16,"to":17},{"label":22,"to":23},{"id":4,"extension":5,"footer":87,"meta":107,"navbar":108,"stem":57,"__hash__":58},{"tagline":7,"legalTitle":8,"cookieSettingsLabel":9,"links":88,"sections":89},[],[90,95,100,105],{"title":13,"links":91},[92,93,94],{"label":16,"to":17},{"label":19,"to":20},{"label":22,"to":23},{"title":25,"links":96},[97,98,99],{"label":28,"to":29},{"label":31,"to":32},{"label":34,"to":35},{"title":37,"links":101},[102,103,104],{"label":40,"to":41},{"label":43,"to":44},{"label":46,"to":47},{"title":8,"links":106},[],{},{"links":109,"action":112},[110,111],{"label":25,"to":54},{"label":16,"to":17},{"label":22,"to":23},{"id":114,"title":115,"author":116,"body":117,"description":487,"extension":488,"meta":489,"navigation":490,"path":491,"primaryKeyword":492,"publishedAt":493,"secondaryKeywords":494,"seo":498,"sources":501,"stem":517,"summary":518,"updatedAt":493,"__hash__":522},"blog\u002Fresources\u002Fblog\u002Fsonic-horn-compressed-air-requirements.md","Sonic horn compressed-air requirements: sizing CFM, pressure and air preparation","Sylio",{"type":118,"value":119,"toc":472},"minimark",[120,125,139,146,154,158,166,174,181,187,192,195,263,266,269,273,276,279,282,286,294,297,302,334,337,340,344,347,350,356,360,368,371,374,378,385,388,391,395,403,406,419,422,426,429,447,451,454,462,466,469],[121,122,124],"h2",{"id":123},"why-firing-demand-matters","Why firing demand matters",[126,127,128,132,133,138],"p",{},[129,130,131],"strong",{},"Sonic horn compressed air requirements"," are easy to underestimate because the horn runs intermittently. Its average demand may be small, but its demand while firing is not. The branch, filter, regulator, ",[134,135,137],"a",{"href":136},"\u002Fglossary\u002Fsolenoid-valve","solenoid valve"," and local storage must deliver the required flow at the required pressure for the whole sounding period. If any one of them is restrictive, the horn may make noise without producing its specified acoustic output.",[126,140,141,142,145],{},"Undersized, wet or poorly filtered air is one of the most common causes of an ",[134,143,144],{"href":47},"acoustic cleaning system"," underperforming in the field. A normal pressure reading on an idle header does not prove that the installation works. The useful measurement is dynamic pressure at the horn inlet while it is sounding.",[126,147,148,149,153],{},"This guide sets out a design-stage method for estimating flow, storage and distribution requirements. It is not a substitute for the selected ",[134,150,152],{"href":151},"\u002Fglossary\u002Fsonic-horn","sonic horn"," manufacturer's certified data, a compressed-air survey or pressure-vessel engineering.",[121,155,157],{"id":156},"separate-peak-flow-from-average-consumption","Separate peak flow from average consumption",[126,159,160,161,165],{},"A horn uses ",[134,162,164],{"href":163},"\u002Fglossary\u002Fcompressed-air","compressed air"," to move its diaphragm and generate sound. Published US EPA guidance gives examples around 45 to 75 standard cubic feet per minute, or scfm, and 45 to 75 psig. Other EPA guidance gives a broader operating-pressure range of 40 to 90 psig. Published model examples commonly fall around 45 to 80 scfm, about 21 to 38 standard litres per second, and 70 to 90 psig, about 4.8 to 6.2 barg. Some larger designs demand materially more.",[126,167,168,169,173],{},"Those are screening ranges, not a generic specification. The selected model's rated flow, minimum ",[134,170,172],{"href":171},"\u002Fglossary\u002Foperating-pressure","operating pressure",", firing duration and test reference conditions control the design. Confirm whether a quoted CFM value means scfm, normal cubic metres per hour or actual volumetric flow at line conditions. They are not interchangeable.",[126,175,176,177,180],{},"The ",[129,178,179],{},"sonic horn CFM"," rating normally describes flow while the horn is sounding. The compressor-room load is governed more by free air per firing and the interval between firings:",[126,182,183],{},[184,185,186],"code",{},"free air per firing = rated scfm x firing time in minutes",[126,188,189],{},[184,190,191],{},"average scfm = free air per firing x firings per hour \u002F 60",[126,193,194],{},"For example, a horn drawing 60 scfm for 10 seconds uses 10 standard cubic feet per event. If it fires once every 10 minutes, its time-averaged demand is only 1 scfm. The local branch still has to pass 60 scfm, not 1 scfm, when the valve opens.",[196,197,198,211],"table",{},[199,200,201],"thead",{},[202,203,204,208],"tr",{},[205,206,207],"th",{},"Design item",[205,209,210],{},"Example input or result",[212,213,214,223,231,239,247,255],"tbody",{},[202,215,216,220],{},[217,218,219],"td",{},"Flow while one horn sounds",[217,221,222],{},"60 scfm",[202,224,225,228],{},[217,226,227],{},"Sounding time",[217,229,230],{},"10 seconds, or 0.167 minutes",[202,232,233,236],{},[217,234,235],{},"Free air per firing",[217,237,238],{},"10 standard cubic feet",[202,240,241,244],{},[217,242,243],{},"Average at one firing every 10 minutes",[217,245,246],{},"1 scfm",[202,248,249,252],{},[217,250,251],{},"Ideal receiver volume from 100 to 85 psig",[217,253,254],{},"9.8 cubic feet, about 73 US gallons",[202,256,257,260],{},[217,258,259],{},"Two horns firing together",[217,261,262],{},"20 standard cubic feet per event, about 146 US gallons on the same assumptions",[126,264,265],{},"The 10-second firing is an example, not a universal schedule. EPA baghouse guidance reports 10 to 30 seconds per cleaning cycle, while the interval must follow the horn, deposit, loading rate and process response.",[126,267,268],{},"This distinction is the basis of acoustic cleaner air consumption calculations. Size the point of use for the peak event, then check that the compressor and treatment plant can replace the event volume during the recovery period.",[121,270,272],{"id":271},"specify-pressure-at-the-sounding-horn","Specify pressure at the sounding horn",[126,274,275],{},"Static header pressure is only the starting point. Pressure is lost through pipe, bends, isolation valves, filters, dryers, regulators, hoses and the actuating valve. Loss rises with flow, so a gauge may show 90 psig before a firing and fall sharply as soon as the horn opens.",[126,277,278],{},"Define the required pressure at the horn inlet while flowing, together with the maximum permissible fall over the firing period. Put a gauge or pressure transmitter downstream of the final regulator and filter, close enough to represent the horn connection. Record the local pressure and the upstream header pressure on the same time base during commissioning. The difference shows whether the restriction is local or plant-wide.",[126,280,281],{},"Do not raise the whole plant header to hide a bad branch. The US Department of Energy advises reducing distribution losses before adding capacity or increasing compressor discharge pressure. A larger pipe, a full-port isolation valve, a correctly selected regulator or a clean filter may restore the horn pressure without increasing energy use across every other air consumer.",[121,283,285],{"id":284},"size-the-air-receiver-for-the-event","Size the air receiver for the event",[126,287,288,289,293],{},"A local ",[134,290,292],{"href":291},"\u002Fglossary\u002Fair-receiver-surge-tank","air receiver or surge tank"," supplies the short burst without forcing the plant header to follow the same sudden demand. It is particularly useful where the horn is remote, the distribution main is marginal or several intermittent users share the header.",[126,295,296],{},"The US Department of Energy gives this first-pass air receiver sizing relationship:",[126,298,299],{},[184,300,301],{},"V = t x Q x Pa \u002F (P1 - P2)",[126,303,304,305,308,309,312,313,316,317,320,321,324,325,328,329,324,331,333],{},"Here, ",[184,306,307],{},"V"," is receiver volume in cubic feet, ",[184,310,311],{},"t"," is event time in minutes, ",[184,314,315],{},"Q"," is free-air demand in scfm, ",[184,318,319],{},"Pa"," is atmospheric pressure in psia, and ",[184,322,323],{},"P1"," and ",[184,326,327],{},"P2"," are the initial and final receiver pressures in psig. Keep ",[184,330,315],{},[184,332,319],{}," on a consistent free-air basis, and adjust for altitude and the supplier's standard conditions. The relationship assumes constant temperature and no compressor supply during the event. If surplus air continues to enter, use net demand rather than total horn demand.",[126,335,336],{},"For the table example, a 60 scfm horn firing for 10 seconds needs 10 standard cubic feet. Using 14.7 psia atmospheric pressure and allowing the receiver to fall from 100 to 85 psig gives an ideal volume of about 9.8 cubic feet, or 73 US gallons. This is a calculation example, not a tank recommendation. The final receiver pressure must remain above the required dynamic horn-inlet pressure by enough to cover downstream losses and regulator headroom. The final size must also allow for pipe volume, temperature, leakage, refill rate, simultaneous demand and design margin.",[126,338,339],{},"Locate dedicated storage close enough to support the horn branch and consider storing treated air downstream of the dryer. Fit the receiver with isolation, pressure indication, a correctly engineered relief device and effective condensate drainage. Selection, inspection and installation must follow the applicable pressure-vessel rules at the plant location.",[121,341,343],{"id":342},"size-pipework-and-valves-for-the-firing-flow","Size pipework and valves for the firing flow",[126,345,346],{},"Nominal connection size is not a line-sizing calculation. A horn may have a smaller inlet connection while its manual calls for a larger rigid supply branch. Requirements also vary between models, and a longer run or shared supply may need a larger line than a short, dedicated branch.",[126,348,349],{},"Start with peak scfm and the lowest available header pressure. Calculate pressure loss through the straight pipe and the equivalent length of every bend, tee, reducer, hose and fitting. Add the supplier's flow loss for the filter, regulator and valve at the actual upstream and downstream pressures. The line is adequate only if the horn retains its required dynamic inlet pressure at the end of the event.",[126,351,352,353,355],{},"Keep the final flexible connection short and full bore. Avoid small quick couplings, undersized regulators and general-purpose solenoids selected only by port size. Ask for valve flow capacity and pressure-drop data at the horn's peak demand. A high-flow ",[134,354,137],{"href":136}," that opens promptly is part of the acoustic design because a slow or restrictive valve changes the pressure rise at the diaphragm.",[121,357,359],{"id":358},"instrument-air-versus-plant-air","Instrument air versus plant air",[126,361,362,363,367],{},"The choice between ",[134,364,366],{"href":365},"\u002Fglossary\u002Finstrument-air-vs-plant-air","instrument air and plant air"," should follow measured quality and reliability, not the label on the header. A horn does not automatically need the plant's highest-purity instrument-air network. General plant air may be suitable if it stays clean, dry and stable at the required flow. Conversely, calling a header instrument air does not prove that a remote branch is free of condensate, rust or pressure collapse.",[126,369,370],{},"ISO 8573-1 classifies compressed-air purity by particles, water and oil. Use the horn and valve suppliers' limits to specify those three attributes rather than inventing one universal sonic-horn class. ISO 7183 provides test methods for dryer performance, including pressure dew point, flow and pressure drop. The required pressure dew point should remain below the coldest temperature reached by the downstream pipework so water does not condense at the point of use.",[126,372,373],{},"Where the existing plant-air quality is uncertain, test pressure dew point, liquid water, oil carry-over and particulate at the proposed connection. Compare the cost of point-of-use treatment with the capacity and criticality of the instrument-air system. Diverting a large intermittent horn demand to a tightly controlled instrument-air header can create a new reliability problem for valves and instruments elsewhere.",[121,375,377],{"id":376},"filter-dry-and-drain-without-starving-the-horn","Filter, dry and drain without starving the horn",[126,379,380,384],{},[134,381,383],{"href":382},"\u002Fglossary\u002Fcompressed-air-filtration-drying","Compressed-air filtration and drying"," should remove bulk liquid, harmful particulate and oil contamination before they reach the regulator, valve and diaphragm. A practical train may include a water separator, automatic drain, particulate or coalescing filtration as required, a dryer, a receiver and point-of-use filtration. The exact order depends on the central system and whether the receiver stores wet or dry air.",[126,386,387],{},"Treatment equipment must be sized at the event flow and worst inlet condition. A filter rated for the average 1 scfm in the example will be grossly undersized for the 60 scfm firing flow. Track differential pressure across filter elements and replace them by condition and maintenance requirement. Check automatic drains under real operating conditions, including cold weather. A blocked drain can send a slug of water downstream, while a failed-open drain wastes air and delays receiver recovery.",[126,389,390],{},"Do not add a lubricator by habit. Follow the selected diaphragm and valve requirements because added oil may be unnecessary or harmful. Provide low-point drains, remove dead legs where possible, and inspect the remote branch for scale after construction work. Clean air at the compressor room can become dirty or wet before it reaches the horn.",[121,392,394],{"id":393},"sequence-multiple-horns-around-peak-demand","Sequence multiple horns around peak demand",[126,396,397,398,402],{},"A ",[134,399,401],{"href":400},"\u002Fglossary\u002Fcycle-controller-sequencer","cycle controller or sequencer"," is an air-demand control as well as a cleaning control. If four 60 scfm horns open together, the instantaneous demand is 240 scfm. If they fire one at a time, the branch and receiver may only have to support one 60 scfm event, provided there is enough recovery time between firings.",[126,404,405],{},"Sequencing lowers peak flow and local storage demand. It does not reduce the total free air consumed by a fixed number of firings or the resulting average demand.",[126,407,408,409,413,414,418],{},"Use a ",[134,410,412],{"href":411},"\u002Fglossary\u002Fplc","PLC"," or ",[134,415,417],{"href":416},"\u002Fglossary\u002Fdcs","DCS"," interlock to prevent unintended overlap, including overlap caused by output delays or a valve that closes slowly. Define a minimum interval based on measured receiver recovery, not an arbitrary timer value. Where the process genuinely requires simultaneous sounding, calculate the combined free-air volume and prove that the common header, treatment train, receiver and branches can deliver it.",[126,420,421],{},"Sequencing must still follow the fouling process. Do not stretch intervals so far that deposits consolidate simply to reduce air demand. Trend receiver pressure before, during and after each event, then adjust the sequence within the cleaning window that the application permits.",[121,423,425],{"id":424},"prove-the-air-system-during-commissioning","Prove the air system during commissioning",[126,427,428],{},"Commission at the lowest credible plant header pressure and with other major air users operating. For every horn, record static inlet pressure, minimum pressure during firing, firing duration, receiver pressure decay, refill time and filter differential pressure. Confirm that the valve opens and closes cleanly and that condensate drains operate. A pressure trace is more useful than a single gauge photograph.",[126,430,431,432,436,437,441,442,446],{},"Keep these readings as a baseline for ",[134,433,435],{"href":434},"\u002Fglossary\u002Fpredictive-maintenance","predictive maintenance",". If cleaning performance later deteriorates, compare dynamic pressure, air quality and refill time before assuming the ",[134,438,440],{"href":439},"\u002Fglossary\u002Ftitanium-diaphragm","titanium diaphragm"," has failed. Rising filter loss, a wet receiver, a changed sequence or a partially closed isolation valve can imitate a worn diaphragm. When inspection does identify wear, follow the model-specific ",[134,443,445],{"href":444},"\u002Fglossary\u002Fdiaphragm-replacement-sonic-horn","diaphragm replacement"," procedure.",[121,448,450],{"id":449},"more-air-cannot-correct-the-wrong-deposit","More air cannot correct the wrong deposit",[126,452,453],{},"Adequate air lets a correctly selected horn produce its intended acoustic output. It does not make acoustic cleaning suitable for every material. Horns work best on dry, friable, loosely bonded particulate and as a prevention method. They are weak or useless on sticky, wet, molten, sintered or hard-bonded deposits.",[126,455,456,457,461],{},"No amount of receiver volume, line diameter or pressure will fix a wrong-deposit application. A surface that is already heavily bonded may need an offline baseline clean, and a process producing sticky ash may need a different cleaning method or root-cause correction. The application limits described for ",[134,458,460],{"href":459},"\u002Fresources\u002Fblog\u002Fsticky-ash-biomass-waste-to-energy-boilers","sticky biomass and waste-to-energy ash"," still apply even when the air system is perfect.",[121,463,465],{"id":464},"the-bottom-line","The bottom line",[126,467,468],{},"Size a sonic horn installation twice: once for the short peak event at the point of use, and once for the much lower average demand seen by the compressor. Use model-specific scfm and dynamic pressure, calculate event volume, provide enough treated storage, size every pipe and valve for firing flow, and sequence multiple horns so pressure does not collapse.",[126,470,471],{},"Then verify the result at the horn while it is sounding. Clean, dry air with stable dynamic pressure is not an accessory to acoustic cleaning. It is part of the system. But it only enables the right application. It cannot turn a wet, sticky or hard-bonded deposit into one that sound can remove.",{"title":473,"searchDepth":474,"depth":474,"links":475},"",2,[476,477,478,479,480,481,482,483,484,485,486],{"id":123,"depth":474,"text":124},{"id":156,"depth":474,"text":157},{"id":271,"depth":474,"text":272},{"id":284,"depth":474,"text":285},{"id":342,"depth":474,"text":343},{"id":358,"depth":474,"text":359},{"id":376,"depth":474,"text":377},{"id":393,"depth":474,"text":394},{"id":424,"depth":474,"text":425},{"id":449,"depth":474,"text":450},{"id":464,"depth":474,"text":465},"Size sonic horn compressed air from firing CFM, dynamic pressure, receiver storage, pipe losses, filtration, drying and multi-horn sequencing.","md",{},true,"\u002Fresources\u002Fblog\u002Fsonic-horn-compressed-air-requirements","sonic horn compressed air requirements","2026-07-02",[179,495,496,497],"acoustic cleaner air consumption","air receiver sizing","instrument air versus plant air",{"title":499,"description":500},"Sonic horn compressed air requirements | Sylio","How to size sonic horn CFM, dynamic pressure, receiver storage, distribution piping, filtration, drying and sequencing for a reliable air supply.",[502,505,508,511,514],{"title":503,"url":504},"US EPA - EPA Air Pollution Control Cost Manual, Chapter 1: Baghouses and Filters","https:\u002F\u002F19january2021snapshot.epa.gov\u002Fsites\u002Fstatic\u002Ffiles\u002F2020-07\u002Fdocuments\u002Fcs6ch1.pdf",{"title":506,"url":507},"US EPA - Fabric Filter, Reverse-Air Cleaned Type with Sonic Horn Enhancement","https:\u002F\u002F19january2021snapshot.epa.gov\u002Fsites\u002Fstatic\u002Ffiles\u002F2020-10\u002Fdocuments\u002Fff-revar.pdf",{"title":509,"url":510},"US Department of Energy - Improving Compressed Air System Performance: A Sourcebook for Industry, Third Edition","https:\u002F\u002Fwww.energy.gov\u002Fsites\u002Fprod\u002Ffiles\u002F2016\u002F03\u002Ff30\u002FImproving%20Compressed%20Air%20Sourcebook%20version%203.pdf",{"title":512,"url":513},"ISO - ISO 8573-1:2010, compressed air contaminants and purity classes","https:\u002F\u002Fwww.iso.org\u002Fstandard\u002F46418.html",{"title":515,"url":516},"ISO - ISO 7183:2007, compressed-air dryers specifications and testing","https:\u002F\u002Fwww.iso.org\u002Fstandard\u002F39401.html","resources\u002Fblog\u002Fsonic-horn-compressed-air-requirements",[519,520,521],"Size the branch, valve and receiver for peak flow while a horn fires, not the low average consumption between cycles.","Check pressure dynamically at the horn. Header pressure at rest can hide losses across undersized pipe, filters, regulators and valves.","Clean, dry air and staged sequencing are essential. Wet or restricted air is a common field failure, but extra air cannot make a wrong deposit suitable.","MoYcWg-l8ZFYEDQRJrB0BobSB5aF4KEkM2fKc6lSI3I",1784564594532]