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 Special Service Craft, July 2022 - Part 15 Piping Systems and Pressure Plant - Chapter 4 Pressure Plant - Section 3 Spherical shells subject to internal pressure

Section 3 Spherical shells subject to internal pressure

Parent topic: Chapter 4 Pressure Plant

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, R i, σ and J are as defined in Pt 15, Ch 4, 1.7 Definition of symbols.

3.1.2 The formula in Pt 15, Ch 4, 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 3.1.1, t is to be not less than for other pressure vessels, where D i is as defined in Pt 15, Ch 4, 1.7 Definition of symbols.

3.1.4 The minimum thickness permitted for vessels manufactured in corrosion resistant steels will be the subject of special consideration.

3.1.5 Openings in spherical shells requiring compensation are to comply, in general, with Pt 15, Ch 4, 2.3 Reinforced openings, using the calculated and actual thicknesses of the spherical shell as applicable.

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