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 Inland Waterways Ships, July 2022 - Part 5 Main and Auxiliary Machinery - Chapter 9 Pressure Vessels other than Boilers - Section 6 Unstayed circular flat end plates

Section 6 Unstayed circular flat end plates

Parent topic: Chapter 9 Pressure Vessels other than Boilers

6.1 Minimum thickness

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

t =
where

p and σ are as defined in Pt 5, Ch 9, 1.2 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 9.6.1 Typical methods of attachment of un-stayed circular flat end plates.

  1. For end plates welded as shown in Figure 9.6.1 Typical methods of attachment of un-stayed circular flat end plates(a):

    C = 0,019 for circular shells.

  2. For end plates welded as shown in Figure 9.6.1 Typical methods of attachment of un-stayed circular flat end plates(b) and (c)

    C = 0,028 circular shells.

Figure 9.6.1 Typical methods of attachment of un-stayed circular flat end plates

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 recognized pipe flange standards.

6.1.3 Openings in flat plates are to be compensated in accordance with Figure 9.6.1 Typical methods of attachment of un-stayed circular flat end plates(a) or (b), with the value of A1, the compensation required, calculated as follows:

A 1 =
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 withPt 5, Ch 9, 6.1 Minimum thickness 6.1.1, as applicable, without corrosion allowance
Limit D = 0,5d o.
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