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F-2 API STANDARD 650

Figure F-1—Appendix F Decision Tree

No

No

No

No

Yes

Yes

Yes

(F.1.2)

Yes

Does tank have internalpressure? (1.1.1, 1.1.8, F.1.1, F.1.2,

F.1.3 and F.7.1)

Does internal pressure exceedweight of roof plates? (1.1.1)

Does internal pressureexceed the weight of the shell,

roof and attached framing?

Provide anchors andconform to F.7.

Does internal pressureexceed

18 kPa (2.5 PSIG)?(F.1.3 and F.7.1)

Use API 620

Basic Design

Basic Design

Basic Design plus Appendix F.1 through F.6.Anchors for pressure not required.Do not exceed Pmax.Limit roof/shell compression area per F.5.

API 650 with Appendix F orAPI 620 shall be used.