Min. Nozzles Spacing API-650 [PDF]

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5-28



API STANDARD 650



F



Shell horizontal butt-weld



G



G S-N A



B



B



B



A A



RTR C



E



LTR



RTR



A D



RTR



B



F



RTR



E



E S-N



C



C



C



Shell vertical butt-weld



Bottom plates or annular plates KEY RTR = Regular-Type Reinforced Opening (nozzle or manhole) with diamond or circular shape reinforcing plate or insert plate that does not extend to the bottom (see Figure 5.7a and Figure 5.8). LTR = Low-Type Reinforced Opening (nozzle or manhole) using tombstone type reinforcing plate or insert plate that extends to the bottom [see Figure 5.8, Detail (a) and Detail (b)]. S-N = Shell openings with neither a reinforcing plate nor with a thickened insert plate (i.e. integrally reinforced shell openings; or openings not requiring reinforcing).



Reference Minimum Dimension Between Weld Toes or Weld Centerline (Notes 1 and 3) Paragraph A (2) B (2) C (2) D (3) E (2) F (4) G (4) Condition Number Shell t t ≤ 12.5 mm 75 mm (3 in.) As 5.7.3.2 150 mm (6 in.) 75 mm (3 in.) (t ≤ 1/2 in.) or 21/2t welded or 21/2t or 5.7.3.3 75 mm (3 in.) PWHT or 21/2t 5.7.3.3 75 mm (3 in.) for S-N Table 5.6a 5.7.3.3 and • 5.7.3.4 8t or 1/2 r Table 5.6b 8t • 5.7.3.4 t > 12.5 mm As 5.7.3.1.a 8W or 8W or (t > 1/2 in.) Welded 250 mm (10 in.) 250 mm (10 5.7.3.1.b in.) 8W or 150 mm (6 in.) 5.7.3.3 8W or 250 mm 5.7.3.3 (10 in.) 75 mm (3 in.) 8t or 1/2 r 5.7.3.3 for S-N Table 5.6a 8t • 5.7.3.4 and • 5.7.3.4 Table 5.6b t > 12.5 mm PWHT 75 mm (3 in.) 5.7.3.2 150 mm (6 in.) 75 mm (3 in.) (t > 1/2 in.) or 21/2t or 21/2t 5.7.3.3 75 mm (3 in.) or 21/2t 75 mm (3 in.) 5.7.3.3 for S-N Table 5.6a 5.7.3.3 and • 5.7.3.4 8t or 1/2 r Table 5.6b 8t • 5.7.3.4 Variables



NOTE 1 NOTE 2 NOTE 3 NOTE 4



If two requirements are given, the minimum spacing is the greater value, except for dimension “F.” See Note 4. t = shell thickness. 8W = 8 times the largest weld size for reinforcing plate or insert plate periphery weld (fillet or butt-weld) from the toe of the periphery weld to the centerline of the shell butt-weld. D = spacing distance established by minimum elevation for low-type reinforced openings from Table 5.6a and Table 5.6b, column 9. Purchaser option to allow shell openings to be located in horizontal or vertical shell butt-welds. See Figure 5.9. t = shell thickness, r = radius of opening. Minimum spacing for dimension F is the lesser of 8t or 1/2 r.



Figure 5.6—Minimum Weld Requirements for Openings in Shells According to 5.7.3 --```,,,``````,`,,,`,,,,,```,`,,



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Licensee=Techint S.A./5938621100, User=Vanoli, Ariel Not for Resale, 05/03/2013 13:46:43 MDT