American Petroleum Institute

ABSTRACT:
a. This specification covers material, design, fabrication, erection, and testing requirements for vertical cylindrical aboveground, closed and open-top, welded steel storage tanks in various sizes and capacities for
internal pressures approximating atmospheric pressures, except that a small internal pressure is permitted when the additional requirements of Appendix F are met. b. This specification is designed to provide the oil industry with tanks of adequate safety and reasonable economy for use in the storage of petroleum and its products and those other liquid products commonly handled and stored by the various branches of the industry. It does not present, nor is it contemplated to establish, a fixed series of allowable tank sizes; but rather it is intended to permit the selection by the purchaser of whatever size of tank may be required to best meet his particular needs. This specification is for the convenience of purchasers and manufacturers in ordering, fabricating, and erecting tanks and is not intended to prohibit purchasers and manufacturers from purchasing and fabricating tanks meeting specifications other than those contained herein; nor is it intended in any way to prohibit purchasers from purchasing tanks from companies not authorized to use the APT monogram. c. Appendix A to this specification presents for ready reference design data relating to tanks which may be built according to specifications contained herein. The data presented in Appendix A are for convenience and are not required in order to comply with this specification.… (meer)