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Reg. 589

Flat Plate Margins

 

The amount of support in relief of the stays which may be attributed to the shell, furnaces or flues to which flat plates are attached, shall not exceed that determined by the following formulae:-


Width of margin in inches = 
C(t-1) Equation XII/23
   W.P.

t is plate thickness in thirty seconds of an inch.
W.P. is working pressure in pounds per square inch.
C=3.47 for plates exposed to flame.
C=3.70 for plates not exposed to flame.

Where the plates are flanged, the margin shall be measured from the commencement of curvature of flanging, or from a line 3 ½ times the thickness of the plate measured from the outside of the plate, whichever is nearer to the flange. Where the flat plate is not flanged for attachment to the shell or flue tubes and is welded as shown in figure XII/12 or XII/16 the width of the margin shall be measured from the inside of the shell or the outside of the flue tube, whichever is applicable.

In no case, however, shall the diameter D of the circle forming the boundary of the margin supported by the uptake of a vertical boiler be greater than that found by the following formula:-

           _____

D =   / 5000A
         ------------ + d²
              W.P

Equation XII/24

A is cross sectional area of the uptake tube in square inches,
W.P. is working pressure in pounds per square inch,
d is external diameter of uptake in inches.
 
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