How to check the integrity of an industrial oil tank after cleaning?

1. Appearance and Structural Inspection
Visual Inspection: Observe the tank surface for signs of corrosion, cracks, deformation, or leakage, focusing on welds, manholes, and flange joints.
Coating and Insulation: Verify that the anti-corrosion coating is not peeling or flaking, and that the insulation is intact.
2. Wall Thickness and Corrosion Inspection
Ultrasonic Thickness Gauging: Use an ultrasonic thickness gauge to measure the thickness of different parts of the tank wall to assess the extent of corrosion and whether the remaining wall thickness meets the standard.
Magnetic Flux Leakage Testing: Magnetic Flux Leakage Testing (MFL): Detects corrosion pits or perforations on the tank bottom using MFL technology to determine bottom integrity.
3. Weld Nondestructive Testing
Radiographic/Ultrasonic Testing: Perform radiographic or ultrasonic testing on welds to detect internal defects such as pores, slag inclusions, and cracks.
Magnetic Particle/Penetrant Testing: Used to detect surface cracks, particularly in welds and areas of stress concentration. 4. Leakage and Strength Testing
Water Filling Test: Fill the tank to the designed level and observe for leaks for 24-48 hours. Monitor tank deformation.
Air Tightness Test (Special Oil Tanks): For high-pressure or flammable medium storage tanks, an air pressure test is required to verify the leak tightness.
5. Accessory and Safety Device Inspection
Breathing Valve/Safety Valve: Test for normal opening pressure (e.g., 6-8 kPa for the outlet valve and 2-3 kPa for the inlet valve).
Wavebreaker and Float: Check for secure welds on the wavebreaker and for proper sealing and buoyancy of the float (for floating roof tanks).
6. Internal Cleanliness and Foreign Object Inspection
Endoscope Inspection: Use a high-definition camera or endoscope to inspect the tank for residue, rust, or tool debris.