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Reg. 545

End Plates, Crown Plates and Tube Plates

 

The end plate of welded Lancashire and Cornish boilers shall be flanged for attachment to shell plates.

a) The dished end plates of boilers shall be in one piece made from one rolled plate. The flat end plates may be made from two pieces by fusion butt-welding. (See figures XII/1 and XII/2). In the latter case, the line of welding shall be parallel to the horizontal axis of the boiler and shall run through the centre line of furnace or furnaces of Lancashire and similar types of boilers. In the case of Marine type boilers, the weld shall be located preferably between two rows of bar stays or if there is only one row of bar stays, between this row and the top row of stay tubes and shall be subjected to a spot radiographic examination, otherwise it shall subjected to full radiographic examination.

 

b) The segments for hemispherical shell crown plates shall be pressed in one heat to correct curvature and shall be butt-welded together in accordance with Figures XII/3, XII/4, XII/5 or XII/6. The cylindrical portion of the crown shall be tangential to the hemispherical portion.

Where hemispherical shell crowns are pressed from one plate the provisions of Regulation 547(b) shall apply.
c) Flanging of plates shall be done by machine. Such flanging shall be done hot, preferably in one operation, but where this is impracticable, creep machine flanging may be used provided that the plate is worked at a suitable temperature and heated for an adequate distance beyond that portion of the plate under immediate treatment.

After completion of the flanging operation, flanges shall be of true peripheral contour (either circular of straight as necessary to ensure accurate alignment with the connecting parts), and of good surface, free from bulges, grooves or other local irregularities; flat portions of the plate shall be free from set or distortion.

In the construction of unfired boilers when the dished ends do not form a part of the heating surface, cold spun dished ends conforming to IS:2825 may be used.

cc)

 

d) Where flats are pressed in dished end plates for the attachment of mountings they shall be formed with an ample radius at the junction of the flat and curved surfaces, and shall be free from sharp corners or tool marks; the plate shall not be unduly thinned.
e) Plates which are flanged in accordance with Regulation  545 (c), shall be welded to the parts to which they are to be connected as follows:

i) to shells or cylindrical fireboxes as shown in Figures XII/7, XII/8, XII/9, XII/10 or XII/11. 
ii) to internal flue tubes as shown in Figures XII/13, XII/14 or XII/15.
iii) to uptakes as shown in Figure XII/15.
iv) to combustion chamber or firebox wrapper plates as shown in Figure XII/17.
Plates which are not flanged shall be welded to the parts to which they are to be connected as follows:-

 

v) to shells as shown in Figure XII/12 or XII/12 A
vi) to internal flue tubes or uptakes as shown in Figure XII/16.
vii) to combustion chamber or firebox wrapper plates as shown in Figures XII/18, XII/19 or XII/20.

 


Where dished ends or crowns are used they shall be flanged for connection to the shell or the cylindrical portion of the firebox. Flat shell and firebox crown plates of vertical boilers shall also be flanged for connection to the cylindrical portions of the shell or firebox.

The opening in the firebox crown plate of a vertical boiler for the uptake shall be flanged and the connection to the uptake made by means of a circumferential butt-weld. ( See Figs.  XII /3, XII/4,XII/5, XII/6). 
 
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