CPE C Series Manual de instrucciones - Página 8
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CLEANING STAINLESS STEEL
Cleaning of austenitic stainless steel (AISI 300 Series), manually or chemically, is dependant on the process
environment the equipment is operated in. Typically, the cleaning regimen should be developed and reviewed
by a plant sanitarian or a formulation representative of a reputable chemical supply company. The following
chemicals may be utilized to clean, passivate and disinfect equipment prior to operation.
• Alkaline Detergent: A blended alkaline detergent may be used to clean equipment. The detergent should
be a blended sodium hydroxide/water detergent, designed for use with austenitic stainless steel equipment
and used at initial concentrations of 1-3% w/w solution at a temperature of 160° F (70° C) to 195° F (90° C)
(dependant on the chemical supplier). The detergent should be formulated with a metal chelation agent, such
as sodium gluconate or gluconic acid, to remove metal ions in the water (hardness dependant) and a surfac-
tant to increase the rinse ability of the solution.
• Acid: To neutralize any residual alkali and render a passive surface on the stainless steel, a 160° F (70° C)
solution of citric acid and water at a concentration of 0.5-3% w/w can be used. Phosphoric acid may be used
at concentrations of 0.5-1.5% w/w at 115° F (45° C). If phosphoric acid is used, corrosion inhibitors should be
blended in prior to use.
• Disinfectant (Food Plants): Caution should be used with application of chemical disinfectants. Most
chemical disinfectants are halogen- or quarternary ammonium-based compounds and, in high concentra-
tions, are very corrosive to austenitic stainless steel. Typically, the most common disinfectant, iodophor, can
be used with a maximum concentration of 25 mg/l at a maximum temperature of < 80° F (25° C). Other com-
mon disinfectants, such as sodium hypochlorite and chloroamine, are not recommended.
Corrosion resistance of austenitic stainless steel is greatest when a layer of oxidation is formed on the
surface of the metal. If the protective surface is disturbed or destroyed, the metal easily can be corroded by
contact fluids.
1. Regularly inspect austenitic stainless steel equipment for surface deposition and/or localized pitting corrosion.
If deposition or discoloration is detected, disassemble equipment, remove components and soak in a mild alkaline-
based detergent. Rinse using warm water. Allow equipment to air dry thoroughly before assembly.
2. Regularly check all electrical devices and verify all equipment is grounded to avoid any electrolytic-concentration
corrosion.
3. Regularly inspect joints and gaskets in the system for crevice corrosion.
4. Regularly inspect equipment for trapped air pockets to avoid pitting caused by oxygen-concentration corrosion.
5. Regularly inspect any areas of equipment using dissimilar metals connected by a mechanical joint to avoid gal-
vanic corrosion.
6. Regularly inspect system components not manufactured with stabilized low carbon stainless steel (intergranular
corrosion).
PUMP CLEANING
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