Anti Icing Guidelines

Anti Icing Guidelines

Guidelines for use with Calcium Chloride w/BOOST.

Anti-icing operations should not begin until after the first snow event that requires snow removal operations to be performed. This will provide a “scrubbing” of the road surface allowing oils and other contaminants to be cleaned from the roadway.

Anti-Icing may be done at any time prior to a predicted winter storm event. The products tested and used have remained effective for up to one week. It is not recommended that this or any Mag Chloride (MgCl2) or Calcium Chloride (CaCl2) / Agricultural By-Product be used in a scheduled anti-icing mode. For example, salt brine used for anti-icing bridges and trouble areas have been applied twice weekly in some States. When this is done with MgCl2 or CaCl2, it can accumulate and if no frost or snow events occur, cause an over application situation.

Application Rate – 20 – 30 gallons per lane mile. you may want to start @ 25 g.p.m. to see how it works for you. Do Not go above 30 g.p.m. More in this case is not better.

Bridges for frost application rate 10 -15 g.p.m.

Ramps or stops at intersections. Apply at 15 g.p.m., more may make it slippery. When Anti-Icing off ramps and on ramps, shut off application at the halfway point of ramp. This will not allow equipment to “drizzle” @ stops or double applications on freeways which cause an over application.

DO NOT overlap routes when anti icing. This is done during snow removal operations and can increase your application rate and may cause slippery conditions when anti-icing. Material can track for up to a mile, depending on conditions and pavement type.

DO NOT apply when road surface temps are at 35 degrees and rising. If during an application the surface temps are rising, the operation should stop and then resume when temperatures are below the 35 degree mark. Applications with surface temperatures over 35 degrees may cause slippery conditions.

Take the wind forecast into account when deciding to apply. If it’s supposed to be windy with drifting, don’t apply. Just like salt it will cause the road become wet.

Note: As stated in the BOOST product data sheet, anti-icing rates can be as low as 15 gals per lane mile. This information is a guideline, All application rates should be tracked and adjusted for your operation. T.A.P.E.R logs are a helpful tool for event tracking.

Application: Spray bars should use ¼” streamer nozzles with a 10” spacing. It is recommended that drop tubes be used for application speeds over 20 mph. For higher speed applications, flaps can be installed around spray bar to help with “misting”.

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About Dave Budd

Vice President of Product Development and Marketing, Great Lakes Chloride, Inc. Serving Michigan, Indiana, Illinois, Ohio and Kentucky. Retired Michigan DOT, October 2010 after 32 years experience in Maintenance/Operations. Specializing in winter operations and liquid de-icers and anti-icers.
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2 Responses to Anti Icing Guidelines

  1. Chris says:

    You’re right about a picture worth a thousand words. What is the product concentration of the beat juice when mixed with brine and what would the re-freeze curve be compared with boost.

    • Dave Budd says:

      Hi Chris, Great question! The Pacific Northwest Snowfighters (PNS) Show in the PNS Experimental Category – Approved Liquid Corrosion Inhibited Products, That Beet Juice (GeoMelt S) mixed at the recommended rate of 25% to a 23% sodium chloride brine, would in effect, dilute the effective percentage of brine to 15%. At the 15%, it is only effective to 22 degrees when you follow the accepted phase diagrams for salt brine. Untreated rock salt works to 6 degrees. I would advise anyone looking to mix Beet Juice with their brine to review the PNS Qualified Products List. You will find that the Beet Juice Product is only listed in the Experimental Category. This does not mean they will automatically be placed in the QPL. There is also a note explaining the dilution factor. BOOST* has been on the QPL for more then six years, with an Freeze Point Depression rating of -60 F. The PNS group is noted as being the Better Business Bureau of Liquid DeIcers, check out their website at the link above.

      I hope this answers your question. Thanks again for reading the Blog. Let me know if I can be of any further assistance.

      DeIceManDave.

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