Section 6 Unstayed circular flat end plates
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 6 Unstayed circular flat end plates

Section 6 Unstayed circular flat end plates

Parent topic: Chapter 4 Pressure Plant

6.1 Minimum thickness

6.1.1 Ends attached by welding are to be designed such that the minimum thickness of flat end plates is to be determined by the following formula:

where
= p and σ are as defined in Pt 15, Ch 4, 1.7 Definition of symbols.
t = minimum thickness of end plate, in mm
d i = internal diameter of circular shell, in mm
C = a constant depending on method of end attachment, see Figure 4.6.1 Typical methods of attachment of unstayed circular flat end plates.

  1. For end plates welded as shown in Figure 4.6.1 Typical methods of attachment of unstayed circular flat end plates:

    C = 0,019 for circular shells.

  2. For end plates welded as shown in Figure 4.6.1 Typical methods of attachment of unstayed circular flat end plates:

    C = 0,028 for circular shells.

6.1.2 Where flat end plates are bolted to flanges attached to the ends of headers, the flanges and end plates are to be in accordance with recognised pipe flange standards.

6.1.3 Openings in flat plates are to be compensated in accordance with Figure 4.2.1 Compensation for welded standpipes or branches in cylindrical shells with the value of A 1, the compensation required, calculated as follows:

where
d o = diameter of hole in flat plate, in mm
t f = required thickness of the flat plate in the area under consideration, in mm, calculated in accordance with Pt 15, Ch 4, 6.1 Minimum thickness 6.1.1, as applicable, without corrosion allowance
Limit D = 0,5d o.

Figure 4.6.1 Typical methods of attachment of unstayed circular flat end plates
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