Section 12 Boiler tubes subject to external pressure
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Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Ships, July 2022 - Part 5 Main and Auxiliary Machinery - Chapter 10 Steam Raising Plant and Associated Pressure Vessels - Section 12 Boiler tubes subject to external pressure

Section 12 Boiler tubes subject to external pressure

Parent topic: Chapter 10 Steam Raising Plant and Associated Pressure Vessels

12.1 Tubes

12.1.1 The thickness of tubes is to be in accordance with Table 10.12.1 Thickness of plain tubes under external pressure for the appropriate outside diameter and design pressure.

Table 10.12.1 Thickness of plain tubes under external pressure

Outside diameter, in mm Thickness, in mm
38 44,5 51 57 63,5 70 76 82,5 89 95 102
        Design pressure, in MPa      
— — — — — — — — — 2,69 2,52 5,89
— — — — — — — 2,62 2,41 2,28 2,14 5,38
— — — — — — 2,41 2,21 2,07 1,93 1,79 4,88
— — — 2,76 2,48 2,28 2,07 1,93 1,79 1,66 1,59 4,47
— 2,93 2,55 2,28 2,07 1,89 1,73 1,59 1,48 1,37 1,27 4,06
2,66 2,28 2,07 1,79 1,59 1,48 1,31 1,24 1,14 1,03 0,96 3,66
2,03 1,69 1,48 1,31 1,21 1,10 0,96 0,89 0,82 0,76 0,69 3,25
1,48 1,24 1,07 0,96 0,86 0,76 — — — — — 2,95

12.1.2 Tubes may be welded at both ends, welded at the inlet end and expanded at the outlet end, or expanded at both ends. In addition to expanding, tubes may be bell mouthed or beaded at the inlet end. Where tubes are welded, the weld detail is to be as shown in Figure 10.9.4 Detail of weld for tube and the tubes are to be expanded into the tube plates in addition to welding, except as permitted by Pt 5, Ch 10, 12.1 Tubes 12.1.3.

12.1.3 For tubes of thickness greater than 6,0 mm, expanding in addition to welding is not required if a recessed weld of depth not less than the tube thickness is provided.

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