scope:

Applicable tanks must meet all of the following criteria.

1) The internal pressure at the top of the stored liquid cannot be greater than tanks built to either of the recognized original standards as described under the definition of a bolted tank and as listed in images 05.025 and 05.030. Also, the minimum operating pressure must not be less than the surrounding atmospheric pressure and the maximum operating pressure can not exceed a measured gauge pressure of one psig, measured at any point between the underside of the top deck plates down to the top surface of the stored product while the liquid is at the maximum allowable fill height.

2) The tanks must be freely vented or as limited in Section 1.1.

3) All tanks must have had original shell thicknesses of

4) Existing tanks may have been fabricated from uncoated carbon steel, but many will have been fabricated from coated carbon steel or galvanized steel.

• See Appendix "A", regarding the possibility of finding aluminum top-decks (roofs) during the inspection process.

5) The use of aluminum was not permitted within past editions of API Specification 12B.

6) All tank repairs must be inspected, after any repair is performed, by a Certified Approved Inspector to ensure compliance with the applicable inspection standard, recommended practice or specification.

7) Tanks must have an operating temperature of

8) Intentionally left blank.

9) All tanks covered in this publication are to have been designed, fabricated, and constructed in such a fashion as to have them declared a bolted tank built to a recognized original standard as described under the definition of a chime tank or panel tank as described within Section 3 of this publication.