Operat ion and Maintenance Manual
QTS Series Twin Screw Positive Displacement Pump
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Below is a general but effective cleaning guideline, a typical cleaning cycle incorporates five
stages:
1. An initial rinse of clean, cold water.
Rinse with clean water at ambient temperature to remove any remaining residue, 10 to 15 minutes
is usually sufficient for this part of the cycle but this will depend on the condition and volume of the
residue to be removed.
2. Rinsing with an alkaline detergent.
Rinse with an alkaline detergent, typically a 2.5% solution of Caustic Soda (NaOH) at 70 ºC to 95 °C
(158 ºF to 203 °F) for a period of 10 to 30 minutes could be used. It is also common to add a
wetting agent (surfactant) to lower the surface tension of the detergent and hence aid its cleansing
ability. This phase of the cleaning cycle should dissolve and remove organic matter such as fats
and proteins.
Another mild detergent solution may be used consisting of 2.0% (w/w) EO/PO Blockcopolumer
10% EO, Genapol PF10, or similar product, 44.0% (w/w) sodium carbonate 96/98%, 20.0% (w/w)
sodium metasilicate (anhydrous), 20.0% (w/w) sodium tripolyphosphate (anhydrous) and 14.0%
(w/w) sodium sulphate (anhydrous).
The detergent solution may vary depending on the properties of the fluid being pumped.
3. Intermediate rinse with cold water.
Intermediate rinse with clean water at ambient temperature for a period of 5 to 10 minutes. This
phase should remove any residual detergents.
4. Rinsing with an acidic disinfectant.
Rinse with an acidic disinfectant, typically a 2.5% solution of Nitric Acid (HNO3) at ambient
temperature for a period of 10 to 15 minutes would be used. This phase of the cleaning cycle
should remove proteins, mineral salts, calcium oxides and other deposits.
5. Final rinse with clean cold water.
Final rinse with clean water at ambient temperature for a period of 10 to 15 minutes or until all
traces of the cleaning fluid has been removed.
During the CIP cycle it is important that the required concentration of cleaning detergents is
constantly maintained. A significant increase in concentration could cause damage to the
pumps and other components in the system. A significant decrease in concentration could
affect the detergents cleaning efficiency. A facility for monitoring and adjusting the detergent
concentration should be considered.
Consideration should also be given to the disposal or recycling of used cleaning liquids and the
potential requirement for handling concentrated detergents. Specialists should make the final
selection of cleaning detergents/disinfectants.
Ampco Pumps Company QTS Manual M-030 Rev A 1.16
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