5-28 API STANDARD 650

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

RTRRTR

RTRS-N

B B

A

C

RTRE LTR

A

D

B B

A

C C

ES-N

E

C

A

F

Shell verticalbutt-weld

Bottom plates or annular plates

GFShell horizontal butt-weld G

KEYRTR = 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).

VariablesRefer-ence Minimum Dimension Between Weld Toes or Weld Centerline (Notes 1 and 3)

Shell t Condition

Para-graph

Number A (2) B (2) C (2) D (3) E (2) F (4) G (4)

t ≤ 12.5 mm(t ≤ 1/2 in.)

As welded

or PWHT

5.7.3.2

5.7.3.3

5.7.3.3

5.7.3.3• 5.7.3.4• 5.7.3.4

150 mm (6 in.) 75 mm (3 in.)or 21/2t

75 mm (3 in.)or 21/2t

75 mm (3 in.)for S-N

Table 5.6a and

Table 5.6b

75 mm (3 in.)or 21/2t

8t or 1/2 r8t

t > 12.5 mm(t > 1/2 in.)

AsWelded

5.7.3.1.a

5.7.3.1.b

5.7.3.3

5.7.3.3

5.7.3.3• 5.7.3.4• 5.7.3.4

8W or250 mm (10 in.)

8W or250 mm (10

in.)

8W or250 mm (10 in.)

75 mm (3 in.)for S-N Table 5.6a

andTable 5.6b

8W or150 mm (6 in.)

8t or 1/2 r8t

t > 12.5 mm(t > 1/2 in.)

PWHT 5.7.3.2

5.7.3.3

5.7.3.3

5.7.3.3• 5.7.3.4• 5.7.3.4

150 mm (6 in.) 75 mm (3 in.)or 21/2t

75 mm (3 in.)or 21/2t

75 mm (3 in.)for S-N

Table 5.6a and

Table 5.6b

75 mm (3 in.)or 21/2t

8t or 1/2 r8t

NOTE 1 If two requirements are given, the minimum spacing is the greater value, except for dimension “F.” See Note 4.NOTE 2 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.NOTE 3 D = spacing distance established by minimum elevation for low-type reinforced openings from Table 5.6a and Table 5.6b, column 9.NOTE 4 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.

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Not for Resale, 05/03/2013 13:46:43 MDTNo reproduction or networking permitted without license from IHS

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