1. Pressure Decay & Airtightness Testing
- Fundamental quantitative method – pressurize tank with gas, monitor pressure drop over time.
- High‑precision sensors detect minute cracks or weld defects.
- Leak rate calculated against safety standards.
2. Vacuum Box & Negative Pressure Testing
- Used for welds and localized connections – vacuum box creates negative pressure.
- Observe vacuum gauge changes or bubble formation.
- Rapidly identifies localized sealing defects.
3. Hydrostatic Testing & Static Pressure Tightness
- Comprehensive verification – fill tank with water to maximum design level.
- Inspect tank bottom, shell, and piping connections for leakage.
- Assesses structural sealing integrity under full‑load conditions.
4. Specialized Inspections for Breather Valves & Accessories
- Periodic testing of breather valves – check opening/closing pressures and leakage rate.
- Prevents evaporative loss and serious incidents (overpressure or implosion).
- Ensures overall sealing system integrity.