31-08-2017, 04:46 PM
It is a well-known fact that corrosion of the plant equipment is costing chemical producers millions of dollars annually. in any other industry today, it is imperative to minimize maintenance and replacement costs and ensure uninterrupted production to stay competitive. Although the high cost of corrosion can not be completely eliminated, it can be considerably reduced by appropriate selection of building materials, modifications in equipment design and operating procedure, and by appropriate selection and application of coatings and protective inhibitors. However, the response to a corrosion problem, either in substitution of the present building materials or in a modification in the design, is usually not simple and can not be easily ascertained without direct knowledge of the problem. This data can be better developed by conducting a well-planned corrosion testing program.
Such a program can best be defined as one that will provide the greatest degree of control over the important reliable data and the most convincing data in a given set of conditions. planning a corrosion testing program, both laboratory and plant testing should be considered. variables and allows the individual study of each variable. However, it is extremely difficult to duplicate in the laboratory the combination of effects, such as solution concentration, temperature, velocity, viscosity, which occurs under actual laboratory testing, restricts the number and size of materials in the test. unless the test solution is continuously renewed, it is difficult or impossible to maintain a constant concentration of known corrosive constituents in the solution, and therefore the results may be erroneous. In a plant test, however, all of the above variables are present. As a result, data obtained from plant testing with operating equipment are considered more reliable and are more convincing than laboratory data where plant conditions can only be approximated.
Such a program can best be defined as one that will provide the greatest degree of control over the important reliable data and the most convincing data in a given set of conditions. planning a corrosion testing program, both laboratory and plant testing should be considered. variables and allows the individual study of each variable. However, it is extremely difficult to duplicate in the laboratory the combination of effects, such as solution concentration, temperature, velocity, viscosity, which occurs under actual laboratory testing, restricts the number and size of materials in the test. unless the test solution is continuously renewed, it is difficult or impossible to maintain a constant concentration of known corrosive constituents in the solution, and therefore the results may be erroneous. In a plant test, however, all of the above variables are present. As a result, data obtained from plant testing with operating equipment are considered more reliable and are more convincing than laboratory data where plant conditions can only be approximated.