Material Compatibility & Dosing Setup for Chlorine Dioxide (CDD5000)

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material compatibility and dosing setup for cdd 5000

When working with chlorine dioxide systems like CDD 5000, choosing the right pumps, piping, and materials is very important. The correct setup ensures safe operation, accurate dosing, and long-term durability. 
 This guide explains—in a simple and user-friendly way—the recommended equipment and materials for dosing, transferring, and handling chlorine dioxide solutions. 

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Dosing Pumps (For Accurate Chemical Injection)

Dosing pumps deliver chlorine dioxide into the water stream. They can be: 

  • Solenoid-operated pumps
  • Motor-driven pumps 

The right type depends on the dosing rate and back pressure. 

  • Recommended Brands:

EMEC, Prominent, LMI, Pulsafeeder, Walchem. 

  • Material Requirements 

All parts of the pump that touch the chemical must be made of: 

  • Kynar™
  • PVC / CPVC
  • Ceramic 

Seals and O-rings should be: 

  • Viton™, Kalrez™, or Teflon™ 
  • Control System 

Your pump should support: 

  • Flow-meter control 
    OR
  • Time-based periodic injection 

Make sure the pump includes an automatic bleed system to remove gases that form inside the pump head. This prevents “air binding.” 

If you are unsure which model to choose — SVS AQUA can help you select the right pump for your plant. 

Transfer Pumps (For Moving the Solution Safely)

Transfer pumps move chlorine dioxide from the storage tank to the dosing system. These should be: 

  • Motor-driven centrifugal pumps
  • Magnetic drive type 

Material Requirements 

Wetted parts must be: 

  • Kynar™
  • PVC
  • CPVC 

Seals/O-rings: Viton™, Kalrez™, or Teflon™ 

Pressure Limit 

Maximum developed head: 

  • 20 psig or 45 ft. Head 

Piping Guidelines

Use rigid PVC or CPVC pipes to carry out the solution. 

Pressure Ratings 

  • Schedule 40: 5” Hg vacuum to 25 psig
  • Schedule 80: Full vacuum to 25 psig 

Installation Tips 

  • Use cemented joints wherever possible.
  • Avoid flanged joints.
  • Keep threaded joints to a minimum.
  • Always seal threaded joints with Teflon™ tape (not liquid Teflon).
  • For long distances or when passing through walls, use double-walled piping for safety. 

Tubing Requirements

For dosing tubing: 

  • Use flexible Kynar™ tubing
  • Fittings should be Kynar™ compression type 

Keep tubing running short. 
To protect against UV light (from sunlight or indoor lighting): 

  • Wrap tubing in tape 
    OR
  • Place it inside a larger opaque tube (like black polypropylene) 

Hoses for Transfer

  • Use PVC transfer hoses
  • Can be reinforced or non-reinforced
  • Must be vacuum rated
  • Minimum size: ¾ inch 

Hose connections should be multi-barb type made from: 

  • PVC
  • CPVC
  • Kynar™
  • Glass-reinforced polypropylene 

Always seal threaded joints with Teflon™ tape. 

Material Compatibility of Chlorine Dioxide (Important for Safety)

Chlorine dioxide—especially in high concentration—is corrosive to many metals and plastics. 

Materials NOT suitable for undiluted chlorine dioxide

  • Aluminum
  • Brass
  • Bronze
  • Carbon steel
  • Stainless steel
  • Copper
  • Iron
  • Zinc 

Many plastics like PVC, CPVC, HDPE, and Polyethylene can weaken over time. Inspect these monthly if used. 

Materials MOST compatible (Best Options)
  • Fluoropolymers: Kynar™, Halar™
  • Fluorinated elastomers: Viton™, Kalrez™, Teflon™
  • Vinyl ester-FRP 

Even these should be inspected monthly for stress cracks. 

Diluted chlorine dioxide
  • <50 ppm: Safe for most materials for up to 1 week
  • <10 ppm: Generally safe for longer durations 

 Setting up the dosing and transfer system correctly is essential for: 

  • Safe handling of chlorine dioxide
  • Preventing corrosion
  • Ensuring accurate dosing
  • Maintaining long equipment life 

If you need help selecting pumps, piping, or materials for your chlorine dioxide system, SVS AQUA can assist you with professional recommendations. 

FAQs

Kynar™, PVC, CPVC, and ceramic materials are the most compatible. 

No. Stainless steel and most metals will corrode quickly when exposed to chlorine dioxide. 

Solenoid or motor-driven dosing pumps from brands like EMEC, LMI, or Prominent. 

Inspect all parts monthly for stress cracks, especially if using PVC or CPVC. 

Yes, but only for diluted solutions, and it must be inspected regularly. 

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