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API Spec 12F-2008 pdf free download

API Spec 12F-2008 pdf free download.Specification for Shop Welded Tanks for Storage of Production Liquids.
4.2 Plates Plates shall conform to the latest edition of one of the following ASTM standards: ASTM A36, ASTM A283 (Grade C or D), and ASTM A285 (Grade C). Shell plates for which minimum thicknesses have been fixed for practical reasons (greater than required by computation) and which will not under run the required computed thickness by more than 0.01 in., as well as all roof and bottom plates, may be purchased on a weight basis. The plate thicknesses or weights, as stipulated herein, are minimums; thicker or heavier material may be required on the order at the option of the purchaser. 4.3 Sheets Sheets shall conform to the latest revision of ASTM A1011, Grade C or D, open-hearth process and basic oxygen process. Sheets may be ordered on a weight or thickness basis, at the option of the tank manufacturer. 4.4 Welding Electrodes Manual arc-welding electrodes shall conform to the E60 and E70 Series of Classification (suitable for the electric current characteristics, the position of welding, and other conditions of intended use) in the latest edition of AWS A 5.1. 4.5 Structural Shapes Structural shapes shall be of open-hearth, electric-furnace, or basic oxygen process and shall conform to the latest edition of ASTM A36. 4.6 Piping Pipe shall conform to Grade A or B of the latest edition of API 5L, ASTM A53, or ASTM A106. 4.7 Flanges Hub slip-on welding and welding-neck flanges shall conform to the material requirements for forged carbon steel flanges as specified in ASME B16.5. 4.8 Couplings Couplings for threaded connections may be supplied with or without recess, complying with the dimensional, physical and chemical requirements of the latest edition of API 5L, Grade B. Alternatively, couplings may comply with the latest edition of ASME B16.11.
5 Design 5.1 General Tanks covered by this specification have been designed using established engineering calculations to determine minimum metal thickness and bolting specifications for each size tank filled with water (62.37 lb/ft 3 @ 60°F) and at the internal pressure specified in Table 1, Column 2. In order to assure structural stability and integrity, additional metal thickness has been added to that determined by calculation. The minimum metal thickness specified in this standard shall in no case be decreased. 5.2 Joint Design Definitions Definitions in Section 3 shall apply to tank-joint designs. 5.3 Size of Weld The size of a weld shall be based on the following dimensions: a) groove-weld: the joint penetration (depth of chamfering plus the root penetration when specified); b) fillet weld: for equal leg fillet welds, the leg length of the largest isosceles right-triangle which can be inscribed within the fillet-weld cross-section; while for unequal leg fillet welds, the leg lengths of the largest right-triangle which can be inscribed within the fillet-weld cross-section. 5.4 Joint Restrictions The following restrictions on type and size of joints or welds shall apply: a) tack welds shall not be considered as having any strength value in the finished structure; b) the minimum size of fillet welds shall be as follows: plate 3 / 16 in. in thickness, full-fillet welds; plates over 3 / 16 in. thick, not less than one-third the thickness of the thinner plate at the joint, with a minimum of 3 / 16 in.; c) single-welded joints shall not be permissible on tank bottoms, shells, or decks.

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