Dry Ice Blasting FAQ's continued
How are Dry-Ice pellets made?
The pellets are made from compressed CO2 which liquefies. The pressure is reduced over the liquid carbon dioxide by sending it through an expansion valve into an empty chamber. The liquid will flash, with some turning into gas causing the remainder to cool. As the temperature drops to -78°C, the temperature of frozen CO2, some of it will freeze into snow. This dry ice snow is then compressed together and extruded into pellets.
What sectors are proven to be most effective?
Production equipment.
Automotive industry.
Marine/Dockyard services.
Industrial control panels.
Printing industry.
Food processing industry.
Foundry industry.
Motor Racing engine parts.
Architectural reclamation.
Nuclear decontamination.
What applications are not so effective?
Baked-on enamel.
Fresh grease and oil.
Soft wood.
Soft plastics.
Brittle substances.
How noisy is the process?
Within the nozzle, the stationary air is sheared by the high velocity air causing turbulence which creates noise. The actual dB level depends on the selected operating pressure and application, and varies from about 70 to 130 dB. Operators and those in the vicinity of the operation must wear ear protection.
Is the process safe?
Yes. In a normal workspace, existing ventilation is sufficient to prevent undue CO2 build-up. In more confined spaces ventilation needs to be actively considered.
Are there any downsides to Dry-Ice Blasting?
A few;
(1) The process can be very loud, requires protective earphones and may cause irritation to other people nearby.
(2) Effective cleaning can only occur in a straight line of sight from the nozzle. Sometimes parts can be disassembled to help.
(3) Carbon dioxide is released which can build up in confined spaces and is harmful if not ventilated out.
