1. Document Review
Before inspection, the following documents should be reviewed:
Inspection Item | Content |
Drawings | GA drawings, fabrication drawings |
Inspection Documents | ITP / QAP |
Dimensional Standards | Tolerance requirements |
Anti-corrosion Documents | Lining inspection reports |
2. Dimensional Inspection
Dimensional accuracy is one of the key quality control points during EW cell fabrication.
Item | Typical Requirement |
Cell length | ±5 mm |
Cell width | ±3 mm |
Levelness | ≤2 mm/m |
Electrode positioning | Minimal deviation |
3. Leak Test Inspection
Leak prevention is another critical inspection item for EW cells.
3.1 Lining Inspection
Inspection Item | Requirement |
Lining thickness | Meets design value |
Spark test | No breakdown |
Surface condition | No pinholes or bubbles |
Any cracks or pinholes may lead to acid leakage during operation.
3.2 Leakage Test
Typical procedure:
- Fill the cell with water for 24 hours
- Check for leakage
- Observe deformation condition
Main inspection areas:
- Weld seams
- Flanges
- Connections
- Drain outlets
Leakage testing is used to identify potential leakage risks before shipment.
4. Factory Acceptance Test (FAT)
Before the cell leaves the manufacturing facility, a comprehensive Factory Acceptance Test (FAT) is carried out to confirm compliance with all design specifications. During this test, inspectors verify the following key items to ensure the cell is ready for shipment:
- Overall dimensions
- Levelness
- Surface condition
- Leakage condition after water filling test
- Structural deformation
5. Site Acceptance Test (SAT)
Once the cell arrives at the plant and is installed, a Site Acceptance Test (SAT) is performed to validate its performance under on-site conditions. During this stage, the focus shifts to ensuring the cell integrates seamlessly with the rest of the SX-EW system.
Inspection Item | Inspection Content |
Levelness | Prevent liquid level deviation |
Electrode installation | Uniform spacing |
Pipeline connection | No leakage |
Water filling test | Leakage inspection |
6. Conclusion
For EW cells used in SX-EW plants, dimensional control and leakage prevention are the two most important inspection priorities. Proper inspection helps reduce installation problems, prevent electrolyte leakage, and improve long-term operational reliability.
