[{"data":1,"prerenderedAt":506},["ShallowReactive",2],{"site-footer-common":3,"glossary:water-lance":45,"glossary-related:water-lance":151},{"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":51,"category":132,"description":133,"extension":134,"meta":135,"navigation":136,"path":137,"relatedTerms":138,"seo":142,"sources":145,"stem":149,"term":47,"__hash__":150},"glossary\u002Fglossary\u002Fwater-lance.md","Water lance",[49,50],"water lances","hydraulic lance",{"type":52,"value":53,"toc":126},"minimark",[54,69,74,96,103,107],[55,56,57,58,62,63,68],"p",{},"A ",[59,60,61],"strong",{},"water lance"," is a handheld or fixed water-jet cleaning device used either during boiler outages (handheld manual variant) or, in fixed mechanised designs (notably from Bergemann), during operation on selected slag-melt zones. The fixed mechanised water lance differs from a ",[64,65,67],"a",{"href":66},"\u002Fglossary\u002Fwater-cannon","water cannon"," primarily in lance length, reach and shot pattern — both technologies rely on thermal-shock cracking of slag.",[70,71,73],"h2",{"id":72},"where-water-lances-are-used","Where water lances are used",[75,76,77,84,90],"ul",{},[78,79,80,83],"li",{},[59,81,82],{},"Outage cleaning"," — handheld lances projecting water into boiler internals after shutdown",[78,85,86,89],{},[59,87,88],{},"Slag-prone zones during operation"," — fixed mechanised lances on coal-fired boiler furnace exits and reheater inlet zones",[78,91,92,95],{},[59,93,94],{},"Cement-plant preheater cleaning"," — manual water-lancing during planned outages on kiln-inlet build-up",[55,97,98,102],{},[64,99,101],{"href":100},"\u002Fglossary\u002Fsonic-horn","Sonic horns"," reduce the frequency of water-lancing campaigns by preventing the accumulation that water lances are deployed to remove.",[70,104,106],{"id":105},"related-terms","Related terms",[75,108,109,114,120],{},[78,110,111],{},[64,112,113],{"href":66},"Water cannon",[78,115,116],{},[64,117,119],{"href":118},"\u002Fglossary\u002Fwaterwall","Waterwall",[78,121,122],{},[64,123,125],{"href":124},"\u002Fglossary\u002Fmanual-lancing","Manual lancing",{"title":127,"searchDepth":128,"depth":128,"links":129},"",2,[130,131],{"id":72,"depth":128,"text":73},{"id":105,"depth":128,"text":106},"alternative-cleaning","A water lance is a handheld or fixed water-jet cleaning device used either during boiler outages (handheld manual variant) or, in fixed mechanised designs (notably from Bergemann), during operation on selected slag-melt zones. The fixed mechanised water lance differs from a water cannon primarily in lance length, reach and shot pattern — both technologies rely on thermal-shock cracking of slag.","md",{},true,"\u002Fglossary\u002Fwater-lance",[139,140,141],"water-cannon","waterwall","manual-lancing",{"title":143,"description":144},"Water lance — handheld or fixed water jet for boiler cleaning","A water lance is a handheld or fixed water-jet cleaning device used during boiler outages or, in fixed designs, for slag-melt zones during operation.",[146],{"title":147,"url":148},"Wikipedia — Soot blower","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FSoot_blower","glossary\u002Fwater-lance","_UHuQxNAjCSzXAcvoICoPcNf5xX6t9fPdViJEE5XCkQ",[152,262,393],{"id":153,"title":113,"aliases":154,"body":158,"category":132,"description":248,"extension":134,"meta":249,"navigation":136,"path":66,"relatedTerms":250,"seo":253,"sources":256,"stem":260,"term":113,"__hash__":261},"glossary\u002Fglossary\u002Fwater-cannon.md",[155,156,157],"smart water cannon","water gun","water lance (waterwall)",{"type":52,"value":159,"toc":243},[160,173,177,185,189,215,220,222],[55,161,57,162,164,165,167,168,172],{},[59,163,67],{}," projects a high-pressure water jet onto boiler ",[64,166,140],{"href":118}," tubes to crack slag deposits by thermal shock. The rapid temperature differential between the cool water and the hot slag fractures the bonded slag layer, allowing the next portion to fall away. Water cannons are the standard cleaning tool for furnace ",[64,169,171],{"href":170},"\u002Fglossary\u002Fslagging","slagging"," on coal-fired and biomass utility boilers.",[70,174,176],{"id":175},"aimed-shots-not-sweeps","Aimed shots, not sweeps",[55,178,179,180,184],{},"Modern ",[181,182,183],"em",{},"smart"," water cannons (notably Clyde Bergemann) are computer-controlled to aim specific shot patterns at known fouling zones. Operators see a heat-flux map from radiant-section thermocouples; the cannon fires shots calibrated to the slag thickness in each zone. Compared with manual aiming, this dramatically reduces water consumption and tube-fatigue risk.",[70,186,188],{"id":187},"trade-offs","Trade-offs",[75,190,191,197,203,209],{},[78,192,193,196],{},[59,194,195],{},"Tube fatigue"," — repeated thermal cycling can crack tubes at the impingement zone over years of service",[78,198,199,202],{},[59,200,201],{},"Water consumption"," — substantial volumes of demineralised water needed",[78,204,205,208],{},[59,206,207],{},"Slag knock-down hazard"," — large fallen slag pieces can damage waterwall lower zones",[78,210,211,214],{},[59,212,213],{},"Effective only on slag"," — does not address dry friable deposits on convective surfaces",[55,216,217,219],{},[64,218,101],{"href":100}," are not effective on furnace slag and water cannons are not effective on dry convective-pass deposits. The two technologies serve different zones of the boiler and do not directly compete.",[70,221,106],{"id":105},[75,223,224,228,232,237],{},[78,225,226],{},[64,227,47],{"href":137},[78,229,230],{},[64,231,119],{"href":118},[78,233,234],{},[64,235,236],{"href":170},"Slagging",[78,238,239],{},[64,240,242],{"href":241},"\u002Fglossary\u002Fsteam-sootblower","Steam sootblower",{"title":127,"searchDepth":128,"depth":128,"links":244},[245,246,247],{"id":175,"depth":128,"text":176},{"id":187,"depth":128,"text":188},{"id":105,"depth":128,"text":106},"A water cannon projects a high-pressure water jet onto boiler waterwall tubes to crack slag deposits by thermal shock. The rapid temperature differential between the cool water and the hot slag fractures the bonded slag layer, allowing the next portion to fall away. Water cannons are the standard cleaning tool for furnace slagging on coal-fired and biomass utility boilers.",{},[251,140,171,252],"water-lance","steam-sootblower",{"title":254,"description":255},"Water cannon — high-pressure water lance for boiler waterwall slag","A water cannon projects a high-pressure water jet onto boiler waterwalls to crack slag deposits by thermal shock. The standard cleaning tool for furnace slag, with care for tube fatigue.",[257],{"title":258,"url":259},"Clyde Industries — Water Cannon","https:\u002F\u002Fclyde-industries.com\u002Fproducts-and-solutions\u002Fwater-cannon","glossary\u002Fwater-cannon","B1ZdzNxHCFNLcoio5f730_KTMBbHrbp8pSD45i2XgiU",{"id":263,"title":119,"aliases":264,"body":268,"category":379,"description":380,"extension":134,"meta":381,"navigation":136,"path":118,"relatedTerms":382,"seo":384,"sources":387,"stem":391,"term":119,"__hash__":392},"glossary\u002Fglossary\u002Fwaterwall.md",[265,266,267],"water wall","membrane wall","furnace wall",{"type":52,"value":269,"toc":372},[270,281,285,288,292,299,303,308,333,337,344,346],[55,271,272,275,276,280],{},[59,273,274],{},"Waterwalls"," are panels of vertical evaporator tubes welded into a gas-tight membrane that line the ",[64,277,279],{"href":278},"\u002Fglossary\u002Ffurnace","furnace"," walls of an industrial boiler. They absorb the radiant heat of the burning fuel and produce most of the boiler's steam.",[70,282,284],{"id":283},"construction","Construction",[55,286,287],{},"Adjacent tubes are connected by a thin steel fin running their full length, forming a continuous gas-tight pressure boundary. Tube diameters are typically 38–63 mm, on 50–80 mm pitches. Wall sections can be hung from headers above (suspension waterwalls) or supported from below (sit-on).",[70,289,291],{"id":290},"fouling-slag-not-ash","Fouling: slag, not ash",[55,293,294,295,298],{},"Furnace temperatures and radiant heat transfer mean that any ash that hits the waterwall is partly molten. Cooled rapidly against the tube wall, it solidifies as ",[64,296,297],{"href":170},"slag",". Slag is hard, bonded, and grows in characteristic patterns: thicker near burner clusters, thinner in cold corners.",[70,300,302],{"id":301},"cleaning-waterwalls","Cleaning waterwalls",[55,304,305,307],{},[64,306,101],{"href":100}," are not effective on hard furnace slag — the deposit is too well-bonded for acoustic energy to dislodge. The standard cleaning tools are:",[75,309,310,318,324],{},[78,311,312,317],{},[59,313,314],{},[64,315,316],{"href":66},"Water cannons"," — high-pressure water lances mounted on the waterwall, fired at specific tube sections",[78,319,320,323],{},[59,321,322],{},"Wall blowers"," — short retract sootblowers with multiple nozzles",[78,325,326,332],{},[59,327,328],{},[64,329,331],{"href":330},"\u002Fglossary\u002Fexplosive-deslagging","Explosive deslagging"," — periodic shock cleaning for severe build-up",[70,334,336],{"id":335},"tube-failures-on-waterwalls","Tube failures on waterwalls",[55,338,339,343],{},[64,340,342],{"href":341},"\u002Fglossary\u002Ftube-erosion-tube-wastage","Tube erosion"," and tube wastage on waterwalls are the leading cause of forced outages on coal-fired and biomass boilers. Mitigation is largely combustion-control rather than cleaning, but excessive aggressive cleaning (especially water cannons) contributes to thermal-fatigue cracking.",[70,345,106],{"id":105},[75,347,348,354,359,363,368],{},[78,349,350],{},[64,351,353],{"href":352},"\u002Fglossary\u002Fboiler","Boiler",[78,355,356],{},[64,357,358],{"href":278},"Furnace",[78,360,361],{},[64,362,236],{"href":170},[78,364,365],{},[64,366,367],{"href":341},"Tube erosion \u002F tube wastage",[78,369,370],{},[64,371,113],{"href":66},{"title":127,"searchDepth":128,"depth":128,"links":373},[374,375,376,377,378],{"id":283,"depth":128,"text":284},{"id":290,"depth":128,"text":291},{"id":301,"depth":128,"text":302},{"id":335,"depth":128,"text":336},{"id":105,"depth":128,"text":106},"boiler","Waterwalls are panels of vertical evaporator tubes welded into a gas-tight membrane that line the furnace walls of an industrial boiler. They absorb the radiant heat of the burning fuel and produce most of the boiler's steam.",{},[379,279,171,383,139],"tube-erosion-tube-wastage",{"title":385,"description":386},"Waterwall — tube panels lining the furnace of a boiler","Waterwalls are panels of vertical evaporator tubes welded into a gas-tight membrane that line the furnace. They absorb radiant heat and produce most of the boiler's steam.",[388],{"title":389,"url":390},"Wikipedia — Water-tube boiler","https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FWater-tube_boiler","glossary\u002Fwaterwall","rkJ624Wtxzhq9pJlFII6R5mMnwza1b97OTUWYv_7eng",{"id":394,"title":125,"aliases":395,"body":398,"category":132,"description":494,"extension":134,"meta":495,"navigation":136,"path":124,"relatedTerms":496,"seo":499,"sources":502,"stem":504,"term":125,"__hash__":505},"glossary\u002Fglossary\u002Fmanual-lancing.md",[396,397],"manual rodding","hand-lance cleaning",{"type":52,"value":399,"toc":489},[400,405,409,441,445,462,469,471],[55,401,402,404],{},[59,403,125],{}," is operator-performed cleaning of industrial equipment using handheld rods, lances, water jets or hammers. In modern industrial practice it is the cleaning method of last resort — performed when automated cleaning systems have failed to prevent build-up that now requires direct human intervention.",[70,406,408],{"id":407},"where-it-persists","Where it persists",[75,410,411,419,426,438],{},[78,412,413,414,418],{},"Cement-plant ",[64,415,417],{"href":416},"\u002Fglossary\u002Fkiln-inlet-ring-snowman","kiln-inlet snowman"," removal during planned outages",[78,420,421,425],{},[64,422,424],{"href":423},"\u002Fglossary\u002Frecovery-boiler","Recovery-boiler"," post-water-wash inspection cleaning",[78,427,428,432,433,437],{},[64,429,431],{"href":430},"\u002Fglossary\u002Fhopper","Hopper"," and ",[64,434,436],{"href":435},"\u002Fglossary\u002Fsilo","silo"," clearance after bridging-induced shutdowns",[78,439,440],{},"Cleaning of partially-blocked equipment too restricted for water-jet access",[70,442,444],{"id":443},"hse-concerns","HSE concerns",[75,446,447,450,453,456,459],{},[78,448,449],{},"Confined-space entry",[78,451,452],{},"Elevated working positions",[78,454,455],{},"Fall-of-material risk above operators",[78,457,458],{},"Heat exposure",[78,460,461],{},"Repetitive-strain injury from sustained manual work",[55,463,464,465,468],{},"The economic and HSE case against manual lancing is the underlying motivation for installing automated cleaning systems including ",[64,466,467],{"href":100},"sonic horns"," — every avoided manual-lancing campaign removes an HSE-exposed operator-hour from the maintenance budget.",[70,470,106],{"id":105},[75,472,473,477,483],{},[78,474,475],{},[64,476,47],{"href":137},[78,478,479],{},[64,480,482],{"href":481},"\u002Fglossary\u002Fhydroblasting-offline","Hydroblasting (offline)",[78,484,485],{},[64,486,488],{"href":487},"\u002Fglossary\u002Fwhip-hammer","Whip hammer",{"title":127,"searchDepth":128,"depth":128,"links":490},[491,492,493],{"id":407,"depth":128,"text":408},{"id":443,"depth":128,"text":444},{"id":105,"depth":128,"text":106},"Manual lancing is operator-performed cleaning of industrial equipment using handheld rods, lances, water jets or hammers. In modern industrial practice it is the cleaning method of last resort — performed when automated cleaning systems have failed to prevent build-up that now requires direct human intervention.",{},[251,497,498],"hydroblasting-offline","whip-hammer",{"title":500,"description":501},"Manual lancing — handheld cleaning by operator-wielded rods or jets","Manual lancing is operator-performed cleaning using handheld rods, lances or jets. Labour-intensive, HSE-burdened; the cleaning method of last resort in most industrial settings.",[503],{"title":147,"url":148},"glossary\u002Fmanual-lancing","zJchHG60v5fKidTvMTfCh6AUkQrlIDmmimXwh2jSRTY",1782613719192]