Sodium Hypochlorite Storage Tank
Suggest: Titanium storage tank
Projects: Stonecutter Island Sewage Treatment Works upgrading
Tank volume: 800m3
Origin: China
Product Introduction
Selecting the correct material for sodium hypochlorite storage is critical to prevent corrosion, avoid product contamination, and ensure long service life. Improper material selection can accelerate decomposition of sodium hypochlorite and lead to oxygen generation, safety risks, and increased operating costs.
The most commonly used materials include:
Polyethylene (HDPE / XLPE)
Fiberglass Reinforced Plastic (FRP)
Rubber-lined Steel
Titanium
Material Comparison
Polyethylene (HDPE / XLPE)
Advantages:
Low initial cost
Widely available
Limitations:
Susceptible to failure at fittings and outlets
Sensitive to UV exposure
Limited structural strength
Service Life:
Outdoor: 4–7 years (up to 6–9 years with coating)
Indoor: 6–9 years
Notes:
Not suitable for critical installations where replacement is difficult
Titanium bolts recommended for flange connections
Fiberglass Reinforced Plastic (FRP)
Advantages:
Good corrosion resistance with proper lining
Customizable structure
Limitations:
Requires strict quality control during manufacturing
Corrosion barrier failure can occur if poorly designed
Maintenance:
Inspection every 2 years
Repair or relining may be required
Service Life:
Can fail within 2–3 years if improperly designed
Rubber-Lined Steel
Advantages:
Strong structural support
Limitations:
Liner degradation over time
Risk of steel exposure → contamination
Service Life:
Typically 3–6 years
Risks:
Undetected liner failure leads to iron contamination
Requires complete relining after failure
Titanium Storage Tank (Recommended Solution)
Material: Commercially Pure Titanium Grade 2
Advantages:
Exceptional corrosion resistance to sodium hypochlorite
No contamination risk
Stable in strong oxidizing environments
Minimal maintenance requirements
Service Life:
30+ years (proven)
Cost Perspective:
Higher initial investment
Lowest lifecycle cost due to durability and low maintenance
Critical Material Compatibility
Avoid ALL incompatible metals in contact with sodium hypochlorite:
Stainless steel
Hastelloy
Monel
Brass / Copper
These materials can cause:
Product contamination
Accelerated decomposition
Increased oxygen formation
Acceptable Metals:
Titanium (primary choice)
Tantalum (for sensors & electrodes)
Silver / Platinum (for ORP electrodes)
System Design Considerations
Even small components must be carefully selected:
Pumps and seals
Flow meter electrodes
Valve components
Pipe fittings and clamps
Instrumentation (temperature wells, diaphragm seals)
A single incompatible component can compromise the entire system.
Case Study
Stonecutters Island Sewage Treatment Works Upgrade Project
Application: Sodium hypochlorite storage
Tank Type: Titanium storage tank
Volume: 800 m³
Origin: China
Outcome:
Achieved long-term corrosion resistance
Reduced maintenance frequency
Improved operational safety and stability
Conclusion
For sodium hypochlorite storage:
Short-term / low-budget → Polyethylene or FRP
Medium-term → Rubber-lined steel (with maintenance)
Long-term / critical systems → Titanium (Best Choice)
Titanium remains the only material proven to exceed 30 years of service life, making it the ultimate solution for reliability, safety, and lifecycle cost efficiency.
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