In the middle of summer, hot weather presents special challenges for dry ice blasting. The two main challenges for dry ice blasting in hot weather are protecting the integrity of your blasting dry ice and cooling the air used to dry ice blast.
- Do not unwrap or open the insulated containers until you are ready to use them.
- Store your blasting dry ice insulated containers out of direct sunlight and wind.
- For added protection, cover the full insulated containers with a blanket, if possible.
- After opening the insulated containers to remove blasting dry ice, refold the plastic liner, replace the cardboard topper, close and fasten the lid.
- In high heat situations you may want to consider taking two deliveries a week instead of one.
For additional information click to our blog post, “Maximize your blasting dry ice performance!”.
Manufacturers of dry ice blasting machines do not address the added challenge of dry ice blasting in the heat. The only specification they highlight is the inlet temperature and dew point of the blast pressure air.
The Cold Jet manual recommends that you cool and dry your blasting inlet air to a dew point of -40 degrees F for continuous operation. The Phoenix manual recommends the dew point not exceed +40 degrees F. Either specification is difficult when it is 90 degrees F outside and a well running and properly serviced diesel portable air compressor raises the temperature of the air approximately 100 additional degrees F. This is where a properly running and set up after cooler dryer comes in.
An after cooler dryer can be permanently attached to your plant air system or you can use a portable after cooler dryer and place it between the air source and the inlet of the dry ice blasting machine. Either one will work. What is important is that you drop the temperature of the air sufficiently enough that the moisture condensates easily in the heat exchanger and is pulled out of the air stream by the water separator. Additionally, you should have a coalescing filter after the water separator to remove any aerosolized oils and other contaminates not removed from the air stream by the water separator. Doing this will provide you a clean, dry air stream to carry your dry ice blasting pellets to the target and will avoid freeze ups in your dry ice blasting machine’s dosing mechanism.