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Reg. 197
FLAT PLATES


Flat Crown plates of Vertical Boilers

a) For the flat crown plates of vertical boilers either with or without bolt stays,  Equation(35)  shall be used in determining the working pressure with C = 80, when the plates are not exposed to flame, and 70 when they are exposed to flame. In this case D is the diameter of the largest circle in inches that can be drawn passing through the centres of the rivets or bolt stays when fitted, or the commencement of the curvature of the flanging, whichever is applicable. Where bolt stays are fitted with washers of the same thickness as the plate securely riveted thereto, the circle shall pass through the centre of the washer rivets but where the washers are not riveted or where none are fitted the circle shall pass through the centre of stays.
b) Where the crown plate is flanged the inside radius of curvature of the flange shall not be less than 4 times the thickness of the end plate, but in no case less than 2-1/2".
c) The thickness of flat crown plates shall in no case be less than the thickness of the cylindrical portion to which it is attached.
 
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