Storage tank apparatus for online inspection

A method for determining a bottom plate health for a storage tank apparatus, the method comprising:

• operatively connecting testing equipment to both of at least one foundation tube and at least one shell tube;
• measuring, using the testing equipment operatively connected to the at least one foundation tube, a first level of corrosion on a product side of a bottom plate;
• measuring, using the testing equipment operatively connected to the at least one shell tube, a second level of corrosion on a soil side of the bottom plate, wherein the product side of the bottom plate contacts a storage material stored in the storage tank apparatus and the at least one shell tube;
• accessing, by a computer processor and through at least one foundation inspection window of a storage tank foundation and at least one shell inspection window of a tank shell, the testing equipment;
• storing, using the computer processor operatively connected to the testing equipment, the first level of corrosion and the second level of corrosion;
• and
• determining, using the computer processor, the bottom plate health based at least in part on monitoring the first level of corrosion and the second level of corrosion while the storage tank apparatus is in service.