Considerations in equipment selection
The chosen equipment must minimize the risk of contamination due to inappropriate product-contact surfaces. Machines should not introduce airborne particles and dust into the environment, nor should they entail the risk that oil or other substances required for their operation will contaminate the product. If an operator cannot contact all equipment surfaces adequately, he or she simply cannot clean them. To facilitate efficient cleaning, equipment must be designed with this principle in mind.
For example, if one dips one's greasy hands in water, they will not become clean. If one puts them into a soap bath, they will become clean, but only after a long time. If one raises the temperature of the soap bath, however, one's hands will become clean more quickly. But if one also rubs one's hands together, they will become clean even more quickly.
The residue and the product-contact surface determine the size, or the impact, needed for the cleaning process. The most suitable type of chemicals and the appropriate temperature are decided according to the residue. High surface action enables the chemicals and temperature to work more efficiently, which makes it possible to reduce both of these parameters, as well as the cleaning time. Because the action is often built into the equipment design, selecting the right equipment can reduce the cost and increase the cleanability of a system.
Cleaning action on the equipment surface is achieved by generating high velocity or flow of cleaning fluids on all product-contact surfaces. This technique distributes the chemicals and temperature better than low velocity does. Increased velocity also generates high turbulence and shear force on the surface, which ensures that the chemicals and temperatures reach deep into the residues and dissolve or detach them safely and efficiently.