Ensuring Corrosion Protection Quality in Wastewater Treatment Equipment
Dissolved Air Flotation (DAF) systems and Lamella Clarifiers are widely used in industrial wastewater treatment, municipal sewage treatment, food processing plants, oil-containing wastewater treatment, and chemical industries.
Since these systems are continuously exposed to corrosive environments, the integrity of their anti-corrosion lining and coating is critical for equipment lifespan and operational reliability.
To ensure long-term performance, all FRP-lined and corrosion-protected equipment manufactured by Zhongshen Environmental undergoes Spark Testing (Holiday Testing) before shipment.
What Is Spark Testing?
Spark Testing, also known as Holiday Testing, is a non-destructive inspection method used to verify the integrity of protective coatings and FRP linings.
During the test, a high-voltage detector is passed over the coated surface. If the coating is intact, no current passes through. If there are pinholes, cracks, voids, or coating defects, the detector generates a spark and alarm, identifying the exact defect location.
What Defects Can Spark Testing Detect?
Spark Testing can identify:
- Pinholes
- Micro-cracks
- Blisters
- Coating holidays
- Delamination
- Poorly cured areas
Without proper inspection, these defects may lead to:
- Premature corrosion
- Leakage issues
- Structural damage
- Increased maintenance costs
- Reduced equipment lifespan
Why DAF Systems Require Spark Testing
DAF units are commonly used in:
- Food processing wastewater
- Slaughterhouse wastewater
- Oily wastewater treatment
- Paper mill wastewater
- Chemical wastewater
- Seafood processing wastewater
These wastewater streams often contain:
- Oil and grease
- Suspended solids
- Salts
- Acidic or alkaline compounds
Even a small coating defect can allow corrosive substances to penetrate the steel structure and cause long-term damage.
Spark Testing ensures:
- Complete coating integrity
- Longer equipment service life
- Reduced maintenance costs
- Higher operational reliability
Why Lamella Clarifiers Also Need Spark Testing
Lamella Clarifiers operate under continuously wet and potentially corrosive conditions.
Industries such as:
- Chemical processing
- Electroplating
- Mining wastewater treatment
- Municipal wastewater treatment
place particularly high demands on corrosion resistance.
Spark Testing helps identify hidden defects before commissioning, preventing costly failures and corrosion-related issues in the future.
Jorsun Environment Quality Assurance Procedure
To ensure superior equipment quality, we follow a strict quality control process:
- Raw material inspection
- Welding quality inspection
- Coating thickness measurement
- Spark Testing (Holiday Testing)
- Equipment performance testing
- Final factory acceptance inspection
Every DAF unit and Lamella Clarifier is thoroughly inspected before delivery.
Conclusion
Spark Testing is more than a routine inspection procedure—it is a critical step in ensuring the long-term durability and reliability of wastewater treatment equipment.
For DAF systems, Lamella Clarifiers, FRP tanks, and corrosion-resistant process equipment, professional Spark Testing significantly reduces corrosion risks and protects customer investments.
Contact Jorsun Environment today to learn more about our DAF and Lamella Clarifier solutions for industrial wastewater treatment.