Japan: Utility model Nos. 3140465 and 3159268
Internal condition of underground tanks can be checked.
- Problem caused by aged deterioration
- Underground steel storage tanks will get corroded in 20 to 30 years, depending on surrounding environment, which will increase the leakage risk of hazardous materials rapidly. Nowadays some of service stations had to close their business because of that.
- Inspection to comprehend current condition
- Current condition of underground tanks is inspected by using fiberscope.
Quite a lot of aged tanks have rust and corrosion inside as shown in the photos below.
Fiberscope inspection scene
Insert fiberscope from the top
making a diagnosis of tank inside image by the fiberscope
film the footage
Measurement of pebbles length 6.35mm
Measurement of rust depth -1.99mm
Inadequate dissolution of the internal welding of the piping joints
Pressure test in combination with fiberscope inspection will bring you the following findings.
Visual inspection of tank and pipe inside
Condition of foreign particles and sediment in tanks and pipes
Condition of whether there is any corrosion or corrosion pit in tanks and pipes, or not
Condition of soundness degree of pipes such as inadequate welding dissolution at piping joints