Niketa Gas Company

Keywords :

DRY ICE , DRY ICE BLASTING SERVICES AND EQUIPMENT SALES

WE ARE DEALERS OF DRY ICE AND DRY ICE BLASTING EQUIPMENTS WE ALSO OFFER DRY ICE BLASTING SERVICES ON SITE Dry ice Blasting - The eco friendly alternative in industrial cleaning applications What is Dry Ice Blasting? Dry Ice Blasting is similar to sand blasting, plastic bead blasting, or soda blasting where a medium is accelerated in a pressurized air stream to impact a surface to be cleaned or prepared. But that's where the similarity ends. Instead of using hard abrasive media to grind on a surface (and damage it), Dry Ice Blasting uses soft dry ice, accelerated at supersonic speeds, and creates mini-explosions on the surface to lift the undesirable item off the underlying substrate. Dry Ice Blasting uses compressed air to accelerate frozen carbon dioxide (CO2) "dry ice" pellets to a high velocity. A compressed air supply of 4 bar/50 scfm to 12 bar/250scfm is used in this process depending on the cleaning requirement. Dry Ice Blasting has many unique and superior benefits over traditional blasting media. Dry ice blasting: • is a non-abrasive, nonflammable and non conductive cleaning method • is environmentally-friendly and contains no secondary contaminants such as solvents or grit media • is clean and can be used in the food industry • Allows most items to be cleaned in place also online without time-consuming disassembly • can be used without damaging active electrical or mechanical parts or creating fire hazards (C02 is used in fire extinguishers) • can be used to remove production residues, release agents, contaminants, paints, oils and biofilms • can be used for many general cleaning applications How does CO2 Blasting Work? CO2 blasting works because of three primary factors: pellet kinetic energy, thermal shock effect and thermal-kinetic effect. optimizes blast performance for each application by combining these forces and adjusting: • compressed air pressure • blast nozzle type (velocity distribution) • CO2 pellet size and density • pellet mass rate and flux density (particles per unit area per second) Pellet Kinetic Energy The process incorporates high velocity (supersonic) nozzles for surface preparation and coating removal applications. Since kinetic impact force is a product of the pellet mass and velocity over time, the delivery system achieves the greatest impact force possible from a solid CO2 pellet by propelling the pellets to the highest velocities attainable in the blasting industry. Even at high impact velocities and direct head-on impact angles, the kinetic effect of solid CO2 pellets is minimal when compared to other media (grit, sand, PMB). This is due to the relative softness of a solid CO2, which is not as dense and hard, as other projectile media. Also, the pellet changes phase from a solid to a gas almost instantaneously upon impact, which effectively provides an almost nonexistent coefficient of restitution in the impact equation. Very little impact energy is transferred into the coating or substrate, so the blasting process is considered to be nonabrasive. Thermal Shock Effect Instantaneous sublimation (phase change from solid to gas) of CO2 pellet upon impact absorbs maximum heat from the very thin top layer of surface coating or contaminant. Maximum heat is absorbed due to latent heat of sublimation. The very rapid transfer of heat into the pellet from the coating top layer creates an extremely large temperature differential between successive micro-layers within the coating. This sharp thermal gradient produces localized high shear stresses between the micro-layers. The shear stresses produced are also dependent upon the coating thermal conductivity and thermal coefficient of expansion / contraction, as well as the thermal mass of the underlying substrate. The high shear produced over a very brief expanse of time