Anti-icing & De-icing using a 30:70 ratio of liquid/dry material Topics ...

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Name: YYYY-MM-DD Documenttitle 7Pre-wet at a 30:70 ratioStep 3: Pre-wet at 30 - 70 ratio• Advantages:• mixture is easier to spread, less influence from side wind• mixture will not bounce off the road as quickly and easily• mixture will stick much better to the road• mixture speeds up the process with de-icing (kick start effect)• 30% liquid:• when possible – brine can be cheaper• when necessary: CaCl2 in16% or 32% concentrationPre-wet at a 30:70 ratioWinter Maintenance operationA typical example of dry versus pre-wet::Name: YYYY-MM-DD Documenttitle 8Pre-wet at a 30:70 ratioIs it something new?Stages in de-icing and anti-icingDo we need two methods?• In Europe:• started early 80’s• common practice now for DOT’s and main roads• last group, currently converting: small fleets (< 5 units)• In North America – 2 test units in winter 2004 – 2005:•Maine DOT:• saved 30% in salt (conservative – “only scratched the surface”)• have bought 4 units•NJ DOT:• put 55 – 75% less $ (in salt) on the road• have bought 3 combination unitsStage1234De-icingAnti-icingDry saltUnknownPre-wet 5%Liquid onlyPre-wet 30%?Pre-wet 30%Name: YYYY-MM-DD Documenttitle 9Name: YYYY-MM-DD Documenttitle 10Pre-wet at a 30:70 ratioAdvantages of de-icing and anti-icing with the 30:70 ratio• Advantages of de-icing and anti-icing with 30:70 ratio:• Only one unit is needed• No swapping necessary• Easier to operate (driver training)• Same route for anti-icing and de-icing• Quick change possible from anti-icing to de-icing (and plowing)The spreader itselfNew methods require new technical solutionsMain difference between European and American spreaders:• Integrated solution: one stop shopping• Spreading discs: better mixing• Controls: very user friendlyAll aimed to put the salt where you want it: the right amount in the right placeName: YYYY-MM-DD Documenttitle 11Name: YYYY-MM-DD Documenttitle 12
Name: YYYY-MM-DD Documenttitle 13The spreader itselfAn integrated design and solutionAdvantages:• Components are designed to work together• No hidden costs in mounting and assembly• One party responsible for the whole spreaderThe spreader itselfSpreading discCompletely made of stainless steelHorizontal adjustmentGas spring to raise the chute easilyVertical adjustmentTeflon layerIntermediate bearing betweenspinner motor and spreadingdiscSensor for feedback of rotating speed of spinner to CPUName: YYYY-MM-DD Documenttitle 14The spreader itselfMixing cone for a optimum mixing of salt and brine1. Two chutes to transport salt and brineseparately (no blockage)2. Salt and brine are injected under differentangles – first mixing stage3. Optimized mixing cone – axial mixing4. Radial mixing between cone and flights5. Further radial mixing on the flightsresulting in thoroughly mixed substance,leaving the disc over a broad sectorThe spreader itselfControlsPut the salt where you want it: the right amount in the right placeName: YYYY-MM-DD Documenttitle 15Name: YYYY-MM-DD Documenttitle 16SummarySummary.. Thanks for your attention!• Pre-wet at 30:70 ratio:• Common practice in Europe• Used for anti-icing and de-icing• Good experiences in North AmericaName: YYYY-MM-DD Documenttitle 17Name: YYYY-MM-DD Documenttitle 18
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Page 5 and 6: Transportation Research DivisionEva
Page 7 and 8: InstallationInstallation of the STR
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Page 12 and 13: For any future purchases, the Depar
Page 14 and 15: Annual Salt Usage by RouteRoute Rou
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Anti-icing & De-icing using a 30:70 ratio of liquid/dry material Topics ...

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