PUMP
3
Instruction & Operation Manual
800.789.1718
Care of Stainless Steel
The stainless steel components in Dixon Sanitary equipment are machined, welded and assembled by skilled craftsmen using
manufacturing methods that preserve the corrosion-resistant quality of the stainless steel.
Retention of corrosion-resistant qualities under processing conditions requires regular attention to the precautions listed below.
1.
Regularly check all electrical devices connected to the equipment for stray currents caused by
improper grounding, damaged insulation or other defects. Corrosion: Pitting often occurs when
stray currents come in contact with moist stainless steel.
2.
Never leave rubber mats, fittings, wrenches, etc. in contact with stainless steel. Corrosion: Pitting or galvanic action.
Objects retard complete drying, preventing air from reforming the protective oxide film. Galvanic corrosion occurs when
two dissimilar metals touch when wet.
3.
Immediately rinse equipment after use with warm water until the rinse water is clear. Clean the equipment (manual or
CIP) as soon as possible after rinsing. Corrosion: discoloration, deposits, pitting. Product deposits often cause pitting
beneath the particles.
4.
Use only recommended cleaning compounds. Purchase chemicals from reputable and responsible chemical
manufacturers familiar with stainless steel processing equipment, they continuously check the effects of their products
on stainless steel.
5.
Use cleaning chemicals exactly as specified by the manufacturer. Do not use excessive concentrations, temperatures
or exposure times. Corrosion: Pitting, discoloration, stress cracks. Permanent damage often occurs from excessive
chemical concentrations, temperatures or exposure times.
6.
For manual cleaning, use only soft non-metallic brushes, sponges or pads. Brush with the grain on polished surfaces,
avoid scratching the surface. Corrosion: Pitting, scratches. Metal brushes or sponges will scratch the surface and
promote corrosion over a period of time. Metal particles allowed to remain on a stainless steel surface will cause pitting.
7.
Use chemical bactericides exactly as prescribed by the chemical manufacturer in concurrence with local health
authority. Use the lowest permissible concentration, temperature and exposure time possible. Flush immediately after
bacterial treatment. In no case should the solution be in contact with stainless steel more then 20 minutes. Corrosion:
Protective film destroyed. Chlorine and other halogen bactericides can destroy the protective film. A few degrees
increase in temperature greatly increases chemical activity and accelerates corrosion.
8.
Regularly inspect the joints in pipelines. Be sure all connections are tight fitting without binding. Corrosion: Crevice
corrosion. Small crevices caused by improperly seated gaskets will promote crevice corrosion. Stainless steel under
stress will develop stress cracking especially in the presence of bactericides containing chlorine.
9.
Regularly inspect equipment for surface corrosion (i.e. pitting deposits, stress cracks, etc.). If deposit or color corrosion
is detected, remove it immediately using mild scouring powder and detergents. Rinse thoroughly and allow to air dry.
Review production and cleaning procedures to determine the cause.
Note:
If corrosion is not removed, the protective
film cannot be restored and corrosion will continue at an accelerated rate.