(Changed) 3.5ģ.5.1 Requirements for the use of butt-welded annular plates (or) use of lap-welded bottom plates.
3.4.2 Bottom plates shall project at least 25 mm (1") width beyond the outside edge of the shell to bottom weld. 3.2.5 The purchaser to specify the maximum tank capacity and overfill protection level requirement.ģ.4 Bottom Plates 3.4.1 All bottom plates shall have a minimum nominal thickness of 6 mm (¼ ") exclusive of any corrosion allowance (CA) specified. The purchaser should give special consideration to foundations, corrosion allowance, hardness testing, and any other protective measures deemed necessary.ģ.2.4 Tanks that meet the minimum requirements of this standard may be subjected to a partial vacuum of 0.25 kPa (1 in. 3.2.2 The purchaser shall state the magnitude and direction of external loads or restraint, if any, for which the shell or shell connections must be designed. 3.2ģ.2.1 The purchaser shall state the design metal temperature, the design specific gravity, the corrosion allowance (if any), and the design wind velocity. Top angle (horizontal leg) may extend either inside or outside. Roof plates shell be attached to the top angle of a tank with a continuous fillet weld on the top side only (see 3.10) c. Shall be welded on the top side only (as a minimum) with continuous full-fillet. Horizontal bottom-side joints shall be seal-welded if specified by the purchaser. Continuous welds for all horizontal top-side joints and for all vertical joints. Full-penetration butt-welds for joining ring sections b.
Minimum two (2) weld passes are required. Purchasers’ options Required procedures Purchaser’s options Requirements Purchaser’s optionsįor tank dia temperature 12.5 mm (1/2") thick, see 3.1.5.7 b and Figure 33C. Recommendations Pan-type, Pontoon type and double-deck-type Remarks Simplified design for thickness limit of 12.5mm Internal floating roof Under tank leak detection and sub-grade protection Shop-assemble storage tanks Technical Enquires Seismic design of storage tanks Design of tanks for small internal pressure Structurally supported aluminum doom roofs Recommendations for design & construction of foundations for above ground oil storage tanks An appendix becomes a requirement only when the purchaser specifies an option covered by that appendix. 1.1.4 The appendices provide a number of design options requiring decisions by the purchaser, standard requirements, recommendations, and information that supplement the basic standard. (NOTE: This standard applies only to tanks whose entire bottom is uniformly supported and to tanks in non-refrigerated service that have a maximum operating temperature of 90☌ (200° F).ġ.1.2 To help purchasers and manufacturers in ordering, fabricating and erecting tanks. API 650: Welded Steel Tanks for Oil Storageġ.1.1 This standard 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 pressure (internal pressures not exceeding the weight of the roof plates).
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