No, the standard applies to ASTs storing: • Stable, flammable and combustible liquids at atmospheric pressure with a specific gravity less than approximately 1.0 • Liquids with operating temperatures between ambient temperature and 200 degrees F. Question: I have a 25,000-gallon (94,607-liter) tank. Do I refer to STI SP001 or should I use API 653 as a basis for inspection? Answer: The scope of STI SP001 includes shop-fabricated and small field-erected tanks. The scope of API 653 includes tanks built to API 650 and API 12C. This leads to an overlap in the scope of the tanks covered by the standards. Therefore, more information is needed about a tank in order to decide the best inspection standard to use. For example, if it is a double-wall horizontal UL 142 tank, then STI SP001 probably is a better choice. If the tank has an API 650 nameplate and is located at a facility at which all of the other tanks are 500,000 gallons (1,892,150 liters) or more, then API 653 may be the better choice