API Standard 650

1 APIW elde TWELFTH EThis standamaterial, devertical, cyliwelded storinternal pre(internal preplates), but additional reonly to tankand to tankmaximum dThis standaadequate sastorage of pliquid produestablish a is intended size tank mintended to ordering, fato prohibit Ppurchasing other than Staned TankEDITION | MARCrd establishesesign, fabricatndrical, aboverage tanks in vssures approxessures not exa higher interequirements aks whose entirs in non-refrigdesign temperard is designedafety and reaspetroleum, petucts. This stanfixed series ofto permit the ay best meet help Purchasbricating, andPurchasers anor fabricating those containendardks for OCH 2013 | 498 s minimum reqion, erection, aeground, closevarious sizes aximating atmoxceeding the wrnal pressure iare met.

2 This se bottom is ungerated serviceature of 93 Cd to provide insonable econotroleum produdard does notf allowable tanPurchaser to shis needs. Thiers and Manu erecting tankd Manufacturtanks that meed in this stanrd 65 Oil StoraPAGES|$475quirements foand inspectioned- and open-tand capacitiesospheric pressweight of the rois permitted wstandard applniformly suppoe that have a C (200 F) or ldustry with tanomy for use in cts, and othert present or nk sizes; insteselect whatevs Standard is ufacturers in ks; it is not interers from eet specificatidard. 0 age .00| PRODUCTr n for top, s for ure oof when ies orted less.

3 Nks of the r ad, it er ended ons For Onl Pho Fax APITNO. C65012r ordering inforline: : 1-800-8(Toll-free(+1) 303(Local anx: (+1) 303I members recermation: 54-7179 e in the an3-397-7056 nd Internationa3-397-2740 eive a 30% disd Canada) al) scount where aapplicable. ContentsPage1 Scope .. General .. Limitations .. Responsibilities .. Documentation Requirements .. Formulas..1-52 Normative References..2-13 Terms and Definitions ..3-14 Materials .. General .. Plates .. Sheets .. Structural Shapes .. Piping and Forgings .. Flanges .. Bolting.

4 Welding Electrodes .. Gaskets ..4-175 Design .. Joints.. Design Considerations .. Special Considerations.. Bottom Plates.. Annular Bottom Plates .. Shell Design .. Shell Openings.. Shell Attachments and Tank Appurtenances .. Top and Intermediate Stiffening Rings .. Roofs.. Wind Load on tanks (Overturning Stability) .. Tank Anchorage..5-966 Fabrication .. General .. Shop Inspection..6-27 Erection.. General .. Details of Welding .. Examination, Inspection, and Repairs .. Repairs to Welds .. Dimensional Tolerances ..7-108 Methods of Examining Joints.

5 Radiographic Method .. Magnetic Particle Examination .. Ultrasonic Examination.. Liquid Penetrant Examination .. Visual Examination .. Vacuum Testing ..8-79 Welding Procedure and Welder Qualifications .. Definitions .. Qualification of Welding Procedures .. Qualification of Welders .. Identification of Welded Joints ..9-310 Marking .. Nameplates .. Division of Responsibility.. Certification ..10-3 Annex A (normative) Optional Design Basis for Small tanks .. A-1 Annex AL (normative) Aluminum Storage tanks .. AL-1 Annex B (informative) Recommendations for Design and Construction of Foundations for Aboveground Oil Storage tanks .

6 B-1 Annex C (normative) External Floating Roofs .. C-1 Annex D (informative) Inquiries and Suggestions for Change .. D-1 Annex E (normative) Seismic Design of Storage tanks .. E-1 Annex EC (informative) Commentary on Annex E .. EC-1 Annex F (normative) Design of tanks for Small Internal Pressures ..F-1 Annex G (normative) Structurally-Supported Aluminum Dome Roofs .. G-1 Annex H (normative) Internal Floating Roofs .. H-1 Annex I (normative) Undertank Leak Detection and Subgrade Protection.. I-1 Annex J (normative) Shop-Assembled Storage tanks ..J-1 Annex K (informative) Sample Applications of the Variable-Design-Point Method to Determine Shell-Plate Thickness.

7 K-1 Annex L (normative) API Standard 650 Storage Tank Data Sheet ..L-1 Annex M (normative) Requirements for tanks Operating at Elevated Temperatures.. M-1 Annex N (normative) Use of New Materials That Are Not Identified .. N-1 Annex O (informative) Recommendations for Under-Bottom Connections .. O-1 Annex P (normative) Allowable External Loads on Tank Shell Openings .. P-1 Annex S (normative) Austenitic Stainless Steel Storage tanks .. S-1 Annex SC (normative) Stainless and Carbon Steel Mixed Materials Storage tanks .. SC-1 Annex T (informative) NDE Requirements Summary ..T-1 Annex U (normative) Ultrasonic Examination in Lieu of Radiography.

8 U-1 Annex V (normative) Design of Storage tanks for External Pressure .. V-1 Annex W (normative) Commercial and Documentation Recommendations .. W-1 Annex X (normative) Duplex Stainless Steel Storage tanks .. X-1 Annex Y (informative) API Monogram .. Permissible Design Metal Temperature for Materials Used in Tank Shells without Impact Testing (SI) .. Permissible Design Metal Temperature for Materials Used in Tank Shells without Impact Testing (USC) .. Lines of Lowest One-Day Mean Temperatures ( F) [ C = ( F 32)].. Thickness for Impact Test Determination of Shell Nozzle and Manhole Materials.

9 Vertical Shell Joints .. Horizontal Shell Joints .. Roof and Bottom Joints .. for Preparing Lap-welded Bottom Plates under Tank Shell .. of Double Fillet-groove Weld for Annular Bottom Plates with a Nominal Thickness Greater than 13 mm (1/2 in.).. of Three-Plate Welds at Annular Plates .. Tank .. Ring (Suggested Detail).. Weld Requirements for Openings in Shells According to .. Manhole .. of Shell Manholes and Nozzles .. Nozzles.. Spacing of Welds and Extent of Related Radiographic Examination .. Nozzle Flanges .. Coefficient for Determining Minimum Reinforcement of Flush-type Cleanout Fittings.

10 Cleanout Fittings .. Cleanout Fitting Supports .. Shell Connection.. of Shell Connection .. Manholes .. Roof Openings with Flanged Covers .. Roof Openings with Hinged Cover.. Roof Nozzles .. Roof Nozzles .. Sump .. Cable Support .. Lug .. Stiffening-ring Sections for Tank Shells.. Opening through Stiffening Ring .. Acceptable Column Base Details .. Check for Unanchored tanks .. of Plates .. Requirements for Tank Shells .. s Nameplate .. s Certification Letter .. Plate Thickness for Shell Manholes and Cleanout Fittings .. Plate Thickness for Shell Manholes and Cleanout Fittings.