TAILIEUCHUNG - Handbook of Lubrication Episode 2 Part 2

Tham khảo tài liệu 'handbook of lubrication episode 2 part 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Volume II 375 All preservatives do not function equally well in a particular product. Sometimes a more expensive preservative is more economical than a cheaper one because the interval between treatments is greater and the amount of material required is less. Sometimes it is more economical to purchase a more expensive coolant and treat it with a cheaper preservative than buying an expensive preservative and using it in a cheap coolant. The purpose of microbiological control is to reduce costs but companies have practiced coolant control without initiating studies to determine if costs are actually reduced. Once an individual has learned to determine the microbial load of a working system and has selected the proper preservative there are a number of things which should be kept in mind. FACTORS THAT INFLUENCE DETERIORATION CONTROL It is impossible to entirely prevent the introduction of organisms into working fluids 11 however it is possible to minimize contamination of a system. Construction of a new plant offers an opportunity to take advantage of a number of factors which may influence coolant life. Plants should never be placed downwind of sewage treatment plants flour mills bakeries feed mills fertilizer plants or cooling towers which may produce either airborne nutrients or contaminants. The internal construction of the plant should be engineered so that it can be cleaned properly with a minimum of effort. Consideration should be given to the design of the circulation system floor elevation dragout recovery coolant storage area pipe work pump rates reclamation equipment and other factors 37 38 Machines should be selected which minimize coolant contact with workers and the environment. Newly acquired reconditioned machines can be sources of major contamination problems and should be thoroughly steam cleaned before being put into operation. Many companies design their systems so that there is too much agitation of the coolant. This practice is usually done in .

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