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 Naval Ships, January 2023 - Volume 2 Machinery and Engineering Systems - Part 8 Pressure Plant - Chapter 2 Other Pressure Vessels - Section 3 Spherical shells subject to internal pressure

Section 3 Spherical shells subject to internal pressure

Parent topic: Chapter 2 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 Vol 2, Pt 8, Ch 2, 1.2 Definition of symbols

3.1.2 The formula in Vol 2, Pt 8, Ch 2, 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 Vol 2, Pt 8, Ch 2, 3.1 Minimum thickness 3.1.1, t is to be not less than 3 + mm, where D i is as defined in Vol 2, Pt 8, Ch 2, 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 Vol 2, Pt 8, Ch 1, 2.5 Reinforced openings using the calculated actual thickness of the spherical shell as applicable.

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