MECHANICAL STANDARDS TEMA CLASS R C B SECTION 5

RCB-3 SHELLS AND SHELL COVERS

RCB9.1 SHELLS

RCB9.11 SHELL DIAMETERS It shall be left to the discretion of each manufacturer to establish a system of standard shell diameters within the TEMA Mechanical Standards in order to achieve the economies peculiar to his individual design and manufacturing facilities.

RCB-3.12 TOLERANCES RCB-3.121 PIPE SHELLS

The inside diameter of pipe shells shall be in accordance with applicable ASTMIASME pipe specifications.

RCB-3.122 PLATE SHELLS The inside diameter of any plate shell shall not exceed the design inside diameter by more than 118" (3.2 mm) as determined by circumferential measurement.

RCB3.13 MINIMUM SHELL THICKNESS Shell thickness is determined by the Code design formulas, plus corrosion allowance, but in no case shall the nominal thickness of shells be less than that shown in the applicable table. The nominal total thickness for clad shells shall be the same as for carbon steel shells. 1

TABLE R-3.13 MINIMUM SHELL THICKNESS

Dimensions in Inches (mm) I

~ Nominal Shell Diameter 6 (1 52) 8-1 2 (203-305) 13-29 (330-737) 30-39 (762-991 ) 40-60 (1016-1524) 61 -80 (1 549-2032) 81 -1 00 (2057-2540)

Minimum Thickness

TABLE CB-3.13 ~ MINIMUM SHELL THICKNESS

Dimensions in Inches (mm)

Nominal Shell Diameter

6 (1 52) 8-1 2 (203-205) 13-23 (330-584) 24-29 (61 0-737) 30-39 (762-991 ) 40-60 (1016-1524) 61 -80 (1 549-2032) 81 -1 00 (2057-2540)

Carbon Steel

Pipe

SCH. 40 SCH. 30

SCH. STD

Alloy *

*Schedule 5s is permissible for 6 inch (152 mm) and 8 inch (203 mm) shell diameters.

RCB-3.2 SHELL COVER THICKNESS Nominal thickness of shell cover heads, before forming, shall be at least equal to the thickness of the shell as shown in the applicable table.

www.tema.org @Tubular Exchanger Manufacturers Association, Inc. 5.3-1

Minimum Thickness

Plate

318 (9.5) 7/16 (11.1) 112 (12.7) 112 (12.7) 112 (12.7) .

1 I8 1 18

311 6 1 14

511 6 511 6 318

(3.2) (3-2) (4.8) (6-4) (7.9) (7.9) (9.5)

Carbon Steel Pipe

SCH. 40 SCH. 30 SCH. 20

Alloy * Plate

5/16 (7.9) 5/16 (7.9) 318 (9.5)

7/16 (11.1) 112 (12.7) 112 (12.7)

1 I8 1 I8 1 18

311 6 1 14 1 14

511 6 318

(3.2) (3-2) (3-2) (4.8) (6.4) ('3.4) (7-9) (9.5)

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