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Stephen H on Differences between API 12F & API 650

By: Stephen H 
Date: Saturday, December 31, 2005
Time: 12:00:00 AM

API 12F is intended mainly for oilfield service. API-650 is more general. API 12F includes certain standard dimensions of tanks. It is generally set up so that a minimum of engineering is required- details are mostly set forth in the standard. No weld x-ray is required. API-12F appurtenances are more standardized. API-650 is set up so that any dimensions desired can be used for the tank. Application of API-650 will require a certain amount of engineering. Weld x-ray is generally required, although it may be omitted as an option under Appendix A. API-650 allows more variation in appurtenances. API-650 also includes geodesic domes, floating roofs, higher-temperature service, etc. If your tank dimensions match one of the available sizes of API-12F, and especially if it is oil-field application, that is probably the way to go. If dimensions do not match 12F, or other operation conditions are not covered by 12F, then use API-650. If I remember right, a 500 barrel tank can be shop fabricated under API-12D (one of the 12-specs, not sure about the "D")- check with local tank fabricators to see if this is practical.





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