what’s “hot” in anti-icing - american public works ... · pdf file1 dennis...
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Dennis Burkheimer- Iowa Department of TransportationMark DeVries – McHenry County Highway DepartmentLayton Lamb – City of Charlotte, North Carolina
What’s “HOT” in Anti-Icing
What to Expect!
• Our Experiences• Equipment• Facilities• Blending of Deicers• Questions
Iowa DOT Anti-icing Operations• Salt Brine average annual use- 8,000,000 gallons• Approximately 250-300 pieces of anti-icing equipment• Statewide anti-icing ability- approximately 15,000 lane
miles• Anti-icing Guidelines:
– Triggered by weather forecast from meteorologist– Pavement temperatures must be above 15 degrees F– Avoid application when blowing snow possible– Application rate at least 50 gallons per lane mile
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McHenry county DOT Anti-icing Operations
• Average seasonal use: 80,000 gallons of Super Mix• Currently two units: 1800 gallon and 300 gallon• County jurisdiction: 550 lane miles, anti-icing program
currently bridges, overpass, and low ADT roadways.• Anti-icing Guidelines:
– Triggered by weather forecast from meteorologist and new Storm Logic maintenance decision support system
– Pavement temperatures must be 15 degrees F and rising
– Wind speeds must be less than 15 mph and no loose snow
– Application rate 40 to 80 gallons per lane mile
City of Charlotte Anti-Icing Operations
• Salt Brine average annual use = 22,300 gallons• Approximately 6 pieces of anti-icing equipment• Citywide anti-icing ability = 99 Bridges• Anti-icing Guidelines:
- Triggered by weather forecast from SSI- Pavement temperatures must be above 15 degrees F- Avoid application when raining- Application rate at least 50 gallons per lane mile
Anti-icing Equipment
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Anti-icing trailers
Eight- 5,000 gallon trailers in fleet
Most purchased as military surplus
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12 ton dry material2,700 gallons anti-icing
250 gallons prewet or separate deicer
Liquid applicator for bridge frost
treatments or isolated areas
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Nozzle designs
¾ inch hose barbs
Provide wheelpath coverage
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Streamer Nozzles
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Salt Brine 6 Hours After Application
Salt Brine 24 Hours After Application
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Salt Brine 24 Hours After Application
Salt Brine 48 Hours After Application
Salt Brine 72 Hours After Application
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Traditional brine facility
New brine building design
Inside storage in large brine building
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Brine makers
Stainless Steel Brine Unit
Agricultural based corrosion inhibitor added to Calcium Chloridewithout proper agitation
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Fallout
Streamer nozzles
Wheelpath flood nozzles
Multi-purpose anti-icing nozzle configuration
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Carries 3-tanks with 1,800 gallons of liquid or can also carry 1,200 gallons of liquid and 6-tons of dry material
Flow boy trailer16 ton dry material2,700 gallons liquid
LIQUID APPLICATIONSLIQUID APPLICATIONS
ANTIANTI--ICINGICINGPREPRE--WETTINGWETTING
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DeDe--Icing MaterialsIcing Materials
• SALT BRINE
• CALCIUM CHLORIDE
• DE-ICE 55
BENEFITS OF EACH BENEFITS OF EACH PRODUCT WE USEPRODUCT WE USE
•• SALT BRINESALT BRINE –VERY LOW COST, DRIES QUICKLY. VERY EFFECTIVE, READILY AVAILABLE OR MADE
•• CALCIUM CHLORIDECALCIUM CHLORIDE – FAIRLY LOW COST, VERY EFFECTIVE AT LOW TEMPERATURES, EXOTHERMIC
• DE-ICE 55 – EFFECTIVE AT LOW TEMPERATURES, GOOD RESIDUAL EFFECT, ENVIRONMENTALLY FRIENDLY, INHIBITOR
BLENDINGBLENDING
• HOW DO THE CHEMICALS REACT
• WHAT % OF EACH CHEMICAL CAN BE MIXED
• HOW DO YOU ACCOMPLISH PRECISION BLENDING
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PREVIOUS DISPENSING PREVIOUS DISPENSING SYSTEMSYSTEM
Individual products dispensed through a one inch hose
HARVEY WILLIAMS OF DULTMEIER AND JOHN ZEIEN, BREW MASTER
OUR FIRST CONCEPT OUR FIRST CONCEPT DRAWINGDRAWING
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OUR FIRST REVIEWOUR FIRST REVIEW
OUR FINAL CONCEPT OUR FINAL CONCEPT DRAWINGDRAWING
OUR FIRST PROTOTYPE OUR FIRST PROTOTYPE MANIFOLDMANIFOLD
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WORK BEGINNINGWORK BEGINNING
MANIFOLD BLENDING SYSTEMMANIFOLD BLENDING SYSTEM
AFTER MANY REVISIONS
PRODUCT CONTROL
FLOW METER
REGULATION STATION
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SUPER MIXSUPER MIX
A COMBINATION OF ALL THREE
SUPER MIXSUPER MIX
• 85% SALT BRINE
• 10% DE-ICE 55
• 5% CALCIUM CHLORIDE
2 INCH FILL STATIONS2 INCH FILL STATIONS
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FILLING STATIONFILLING STATION
100 GALLON TANKS CAN BE FILLED IN 45 SECONDS
SALT BRINE PRODUCTIONSALT BRINE PRODUCTION
CONVEYING SALT TO THE SYSTEM
SALT BRINE PRODUCTIONSALT BRINE PRODUCTION
4500 GALLONS STORAGE
UNIT HAS PRODUCED 2300 GALLONS/HOUR
DISCHARGE TO FILLING STATION
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DOES THE MIX WORK?DOES THE MIX WORK?
SUPER MIX PERFORMANCESUPER MIX PERFORMANCE
A SUNDAY MORNING, PAVEMENT TEMP. 3 - 6
DEGREES AT 7AM DURING A SNOWSTORM
PAVEMENT TEMP. 2 MIX WORKING
PRE – WET APPLICATIONS
COSTS AND SAVINGSCOSTS AND SAVINGS
• MANIFOLD AND BRINE PRODUCTION SYSTEM < $15,000 (EXPERIMENTAL PRICE
& EXISTING EQUIPMENT)
• 17 CENT PER GALLON SAVINGS IN SALT BRINE BY PRODUCING OUR OWN
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COSTS AND SAVINGSCOSTS AND SAVINGS• 2004 CALCIUM CHLORIDE USE 22,521
GALLONS
• 2005 CALCIUM USE TO DATE 1,850 GALLONS A 20,671 GALLON REDUCTION
• DE-ICE 55 USE TO DATE – NO CHANGE
• TO DATE A 10% REDUCTION IN SALT USED
Southeastern Anti-Icing
The Charlotte, North Carolina Experience
Charlotte’s Typical Winter Storm
• Rain to freezing rain• Ice• Sleet• Snow
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Elements ofCharlotte’s Anti-Icing
• Equipment• Practices
Salt Brine – Equipment
Salt Brine – Equipment
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Salt Brine – Equipment
Salt Brine – Equipment
Salt Spreading - Equipment
Spreaders with brine/ calcium saddle tanks
Rock salt pre-wet at spinner
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Anti-Icing Practices
Bridge Deck - Brine
Bridge Deck – Salt Windrow
Anti-Icing Practices
Brining streets
Heavy salting wet streets during rain events
Anti-Icing Benefits
• Works to prevent – sudden freezing– icing of bridge decks– bonding of snow & ice– hard pack
• Improves– response (proactive)– effectiveness of salt
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Winter Maintenance Mailing List
[email protected] the body of message on a line
by itself on that line, type the word subscribe
InfoNow
Winter Maintenance Subcommittee Website
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QUESTIONS?
THANK YOU!
Dennis BurkheimerIowa Department of Transportation(515) [email protected]
Mark DeVriesMcHenry County Highway Dept.(815) [email protected]
Layton LambCity of Charlotte, NC(704) [email protected]