Care of Component Materials
Waukesha Cherry-Burrell
®
Brand Universal 3 Pump
Page 10
95-03103
02/2021
Care of Component Materials
NOTE:
SPX FLOW recommends the use of an FDA-approved anti-seize compound on all threaded
connections.
WARNING
Failure to comply with the Care of Component Materials could lead to bodily injury.
Stainless Steel Corrosion
Corrosion resistance is greatest when a layer of oxide film is formed on the surface of stainless steel. If film is
disturbed or destroyed, stainless steel becomes much less resistant to corrosion and may rust, pit or crack.
Corrosion pitting, rusting and stress cracks may occur due to chemical attack. Use only cleaning chemicals
specified by a reputable chemical manufacturer for use with 300 series stainless steel. Do not use excessive
concentrations, temperatures or exposure times. Avoid contact with highly corrosive acids such as hydroflu-
oric, hydrochloric or sulfuric. Also avoid prolonged contact with chloride-containing chemicals, especially in
presence of acid. If chlorine-based sanitizers are used, such as sodium hypochlorite (bleach), do not exceed
concentrations of 150 ppm available chlorine, do not exceed contact time of 20 minutes, and do not exceed
temperatures of 104°F (40°C).
Corrosion discoloration, deposits or pitting may occur under product deposits or under gaskets. Keep surfaces
clean, including those under gaskets or in grooves or tight corners. Clean immediately after use. Do not allow
equipment to set idle, exposed to air with accumulated foreign material on the surface. Corrosion pitting may
occur when stray electrical currents come in contact with moist stainless steel. Ensure all electrical devices
connected to the equipment are correctly grounded.
Alloy 88
Waukesha Alloy 88 is the standard rotor material for Universal 1, Universal 2, Universal 3, Universal TS, Uni-
versal Lobe, Universal 420/520, and 5000 Series Rotary PD pumps. This alloy was developed specifically for
corrosion resistance and close operating clearance requirements of high performance rotary positive displace-
ment pumps. Alloy 88 is a nickel based, corrosion-resistant, non-galling or seizing material. The ASTM desig-
nation is A494 Grade CY5SnBiM (UNS N26055), and the material is listed in the 3-A Sanitary Standards as
acceptable for product contact surfaces.
The corrosion resistance of Alloy 88 is approximately equal to AISI 300 Series Stainless Steel. However, Alloy
88 has limited resistance to certain aggressive chemicals that may be commonly used in contact with AISI 300
Series Stainless Steel.
Do not use Alloy 88 in contact with nitric acid. Nitric acid is commonly used to passivate new installations of
stainless steel equipment. Do not allow nitric acid based passivation chemicals to contact Alloy 88 rotors.
Remove the rotors during passivation and use a separate pump to circulate the passivation chemicals. Also, if
nitric acid-based CIP cleaning chemicals are used, remove the rotors prior to CIP cleaning and clean them
separately by hand in a mild detergent. If you have questions regarding other aggressive chemicals, please
contact SPX FLOW Application Engineering for assistance.
Elastomer Seal Replacement Following Passivation
Passivation chemicals can damage product contact areas of this equipment. Elastomers (rubber components)
are most likely to be affected. Always inspect all elastomer seals after passivation is completed. Replace any
seals showing signs of chemical attack. Indications may include swelling, cracks, loss of elasticity or any other
noticeable changes when compared with new components.