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5. PUMP CLEANING
CPE Systems Inc.
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5.1 Clean In Place
Our centrifugal pumps are designed to be cleaned in place (CIP). No disassembly should be
required for cleaning if a proper CIP procedure is followed.
5.2 Cleaning Stainless Steel
Cleaning of stainless steel (AISI 300 Series), manually or chemically, is dependent 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
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) (depending on the chemical supplier). The
detergent should be formulated with a metal chelating agent, such as sodium gluconate or
gluconic acid, to remove metal ions in the water (hardness dependent) and a surfactant 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 the application of chemical
disinfectants. Most chemical disinfectants are halogen or quaternary ammonium-based
compounds and, in high concentrations, are very corrosive to 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 common disinfectants, such as sodium
hypochlorite and chloramine, are not recommended.
5.3 Preventing Corrosion
The corrosion resistance of 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 can
easily be corroded by contact fluids.
1. Regularly inspect 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 galvanic corrosion.
6. Regularly inspect system components not manufactured with stabilized low carbon
stainless steel (intergranular corrosion).
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+1 800 668 2268
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