Section 3 Spherical shells subject to internal pressure
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Ships, July 2022 - Part 5 Main and Auxiliary Machinery - Chapter 11 Other Pressure Vessels - Section 3 Spherical shells subject to internal pressure

Section 3 Spherical shells subject to internal pressure

Parent topic: Chapter 11 Other Pressure Vessels

3.1 Minimum thickness

3.1.1 The minimum thickness, t, of a spherical shell is to be determined by the following formula:

where
t, p, Ri, σ, c and J = are as defined in Pt 5, Ch 11, 1.2 Definition of symbols.

3.1.2 The formula in Pt 5, Ch 11, 3.1 Minimum thickness 3.1.1 is applicable only where the resulting thickness does not exceed half the internal radius.

3.1.3 Irrespective of the thickness determined by the formula in Pt 5, Ch 11, 3.1 Minimum thickness 3.1.1, t is to be not less than 3 + mm, where D i is as defined in Pt 5, Ch 11, 1.2 Definition of symbols. The minimum thickness permitted for vessels manufactured in corrosion resistant steels will be the subject of special consideration.

3.1.4 Openings in spherical shells requiring compensation are to comply, in general, with Pt 5, Ch 10, 2.5 Reinforced openings, using the calculated and actual thickness of the spherical shell as applicable.

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