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home Best Technology / Case Studies – Industry Applications / Cascade Overflow Rinse Tanks

Cascade Overflow Rinse Tanks

Cascade Overflow Rinse Tank

Cascade Overflow Rinse

There is a simple truth in cleaning your manufactured parts: the parts are only as clean as your final rinse. The goal in any cleaning application is to make your final rinse as effective as possible. For many customers that means incorporating a cascade overflow rinse tank system.

Typical Wash-Rinse-Rinse Cleaning Line Diagram

Typical Wash-Rinse-Rinse Cleaning Line

In a typical aqueous cleaning line for medical device or aerospace parts, the parts will move through three separate tanks or baths as depicted above. The first is a cleaning solution – often an alkaline detergent – that is designed to loosen soils on the parts. Depending on the types of parts and soils, any of the following may be used in this tank to add a “scrubbing” action to the cleaning: ultrasonics, agitation, fluid circulation, and/or rotating parts baskets.

The second tank or solution will be the first rinse. In most applications this will be a tank of de-ionized water (DI water). But the truth is, it won’t remain de-ionized for long. As the parts are moved into this tank they will carry with them some of the wash solution from the wash cycle and some of the soils from the parts; loosened, but still present. Known as “drag out,” this solution will mix in with the DI water. The chemistry from the wash solution and the soils will interact in the DI tank and begin to re-ionize the solution.

This is why the second rinse is so important. This tank or solution (also DI) will receive the parts after the first rinse.  As before, it will receive some drag out from the previous rinse tank, but by now the vast majority of the soils are long gone.  As the parts come out of this bath, a final concern comes into play.  Once the parts are dried you want to make certain there is no spotting on the surface of the parts. Typically spots are not caused by remaining soils, but by mineral content or other impurities in tap water or dirty rinse water. DI water helps, but just using a DI tank as a rinse may not be enough.

Cascade Overflow Rinse Tank - viewed from above

Cascade Overflow Rinse Tank – Stand-alone

The key that takes your cleaning line to the highest possible level of cleanliness is a cascade overflow rinse tank. The photo above shows a two-tank rinse unit. Near the center wall separating the two rinse tanks you can see a second wall that is shorter. In this system the tank on the right is the final rinse. Clean DI is added continuously – at a very low flow rate – from the bottom of the tank. As the tank fills it will eventually flow over the shorter wall into a weir which then cascades into the tank on the left. This process is depicted in the sketch below with the light blue stream moving from Rinse #2 to Rinse #1.

Cascade Overflow Process DiagramCascade Overflow / Counterflow Concept

In time the left-hand tank – Rinse #1 – will overflow, too. This time the water flows to a weir (green in the image above) that directs the liquid to a drain – often a holding tank for later reclamation. In this type of system, the 2nd rinse is constantly refreshed with new DI water, and in turn it constantly refreshes the first rinse with cleaner water. The end effect is a a clean part with a spot-free rinse.

Cascade overflow / Counterflow rinse tanks

Cascade Overflow Rinse Tanks – Wet Bench Application

In the examples above we see tanks that Best Technology custom designed to fit specific customer requirements for their part configurations – but a cascade overflow rinse tank system can be added to virtually any aqueous system. Cascade overflow rinse is a best practice not only for rinsing parts after cleaning, but also after passivation. Another best practice? Contact the wet and dry finishing experts at Best Technology Inc.

Cascade Overflow Rinse Tank - Rear View

Cascade Overflow Rinse Tanks – Rear View

Latest News & Products from Best Technology

Semi-Automated Inline Citric Passivation Solution with Data Tracking

For one medical device manufacturer, the design of a citric passivation solution faced two major challenges: The manufacturing process required performing a water-break test after cleaning parts, before proceeding to passivation. This meant that they could not use a fully automated passivation solution. The system had to have data tracking for quality control purposes. Semi-Automated […]

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  • Request More Information
  • Industrial Parts Washers
    ✛
    • Agitated Immersion Heated Parts Washers
    • Inline Conveyor Wash-Rinse-Dry Parts Washers
    • Immersion Inline Parts Washer
    • Spray Cabinet Parts Washers
      ✛
      • Front Load Spray Cabinet Parts Washer
      • Top Load Spray Cabinet Industrial Parts Washer
    • Vertical Door Pass Through Parts Washer
    • Rotary Drum Parts Washer
    • Powder Coat Prep Equipment
    • Phosphating Lines
    • Pipe Washing Equipment
  • Precision Cleaning Systems
    ✛
    • Applicable Articles
    • How clean is clean?
    • How Do Ultrasonic Cleaners Work?
    • Ultrasonic Benchtop Parts Cleaner
    • Benchtop Ultrasonic Parts Cleaning Multi-Tank Systems
    • Ultrasonic Cleaning Consoles
    • Automated Ultrasonic Parts Cleaning Equipment Wash-Rinse-Dry
    • Large Scale Automated Precision Aqueous Cleaning for Cellular Manufacturing
    • Agitated Immersion Ultrasonic Parts Washer
    • Machine Shop Parts Washer for Swiss and CNC Precision Parts
    • Immersible Ultrasonic Transducers
    • Vapor Degreasers
  • Passivation Equipment
    ✛
    • Applicable Articles
    • What is Passivation? How Does It Work?
    • Nitric vs. Citric Acid Passivation
    • CitriSurf – Citric Acid Passivation
    • Benchtop Ultrasonic Passivation Equipment
    • Ultrasonic Automated Passivation Equipment
    • Automated Ultrasonic Passivation System for Medical Device Parts
    • Passivation Wet Bench for Citric / Nitric Acid
    • Cleanroom Space Saving Automated Passivation System
    • Heated Polypropylene Acid Passivation and Rinse Tanks
    • Agitated Immersion Multi-Tank Passivation Systems
    • Automated Chemical Neutralization Tank / Cart
  • Electropolishing Equipment
    ✛
    • What is electropolishing? How does electropolishing work?
    • Electropolishing Cycle and Current Calculator
    • What is Dry Electropolishing? How does it work?
    • Passivation vs. Electropolishing
    • Table Top Electropolishing Equipment & Electropolishing Machines
    • Electropolishing Wet Benches
    • Large Scale Part Electropolishing Systems
    • Dry Electropolishing Machines
    • EP System – Open Top Wet Bench with Spray Rinse
  • Surface Finishing Systems
    ✛
    • Alodine Lines
      ✛
      • What is Alodine / Chem film / Chromate Conversion Coating?
      • Alodine Chem Film Tank Line
    • Mass Finishing Machines
      ✛
      • Centrifugal Barrel Finishing Machines
      • Spin Dryers / Chip Wringers
      • Vibratory Bowl Polishers
    • Titanium Anodizing Equipment
  • Wet Benches
    ✛
    • Citric / Nitric Passivation Wet Bench for Stainless Steel & Titanium
    • Electropolishing Equipment in a Wet Bench / Fume Hood
    • Fume Hoods
    • Wet Benches for Semiconductor & FM4910 Applications
    • Quick Dump Rinse Tank
  • Specialty & Custom Industrial Process Systems
    ✛
    • Automated Chemical Neutralization Tank / Cart
    • Vapor and Dryfilm PTFE Coating Systems
    • Heated Hot Air Parts Dryer
    • Solvent Recovery Equipment
  • Precision Cleaning Chemistries, Solvents & Fluids
    ✛
    • Why Use a Parts Cleaning Solvent?
    • 3M Novec Engineered Fluids, Fluorinert Liquids, Solvents & Chemicals
    • Solvent Cleaning with 3M Novec Engineered Fluids
    • Thermal Management / Heat Transfer with 3M Novec and Fluorinert Fluids
    • 3M Novec 72DA 73DE Solvent Vapor Degreaser For Medical Device Instruments
    • Solvent Phase-outs
      ✛
      • AK225 HCFC-225 Phase Out and Replacement with 3M Novec HFE Engineered Fluids
      • Medical Device AK 225 Replacement with 3M Novec Engineered Fluid Solvent
      • nPB Replacement
    • Aqueous Cleaning Chemistries
  • Case Studies
    ✛
    • Industrial Parts Washer Case Studies
    • Part Cleaning Case Studies
    • Passivation Systems Case Studies
    • Part Finishing Equipment Case Studies
    • Precision Cleaning Systems Case Studies
  • Equipment Financing
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