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  Reg. 366 B

End Plates

1)

Dished End Plates.- The maximum working pressure of dished end plates with ‘pressure on concave side’ shall be determined by Regulations 276 to 278.

The value of E may be taken as unity when the diametral cross sectional area of the compensating frame and/or ring is equal to or greater than the diametral cross-sectional area of the opening in the end plate to be compensated.

For ends which are butt welded to the cylindrical parts of the shell the thickness of the edge of the flange for connection to the cylindrical part of the shell shall be not less than that required for seamless unpierced shell as determined by Equation 72.

2) Flat End Plates:- The maximum working pressure for welded in flat end plates shall be determined by the following formula”-

W. P. = f T²
C d²

Where,

T = Minimum thickness of end plate in inches.
d = Internal diameter of shell in inches.
W. P. = Working pressure in lbs./sq. in.
C = 0.28
f = Maximum permissible working stress in pounds per square inch at working metal temperature as prescribed in regulation 271.

Where steels are intended for service at temperatures in excess of 700°F, this shall be so stated and silicon content shall not be less than 0.10 per cent or alternatively, the material shall pass the ‘Proof test for creep quality of carbon steel plates of boiler plate quality’ as in Appendix D.

Where flat end plates are bolted to flanges as in Fig. 365/5, the dimensions of the flanges shall be given in Appendix E. The thickness of the end plates shall be not less than that of the corresponding flanges.

Where the diameter of a hole in the flat end plate exceeds 2 ½ T + 2 ¾ inches compensation shall be provided in accordance with Regulations 170 and 279.
 
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