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Reg. 555 d

Seatings for Mountings

  Attachment of Standpipes

The following constructions as to stand-pipes attached to shells and end plates shall be permissible:

i) When the internal diameter of the standpipe does not exceed 1 inch, the standpipe may be screwed into the plate with a nut on the waterside.
ii) Where the internal diameter of the standpipe exceeds one inch but does not exceed 2 inches, it may be screwed in and seal-welded.
iii) Where the diameter of the standpipe exceeds 2 inches, it may be welded to the end plate.

The foregoing provisions as to the standpipe attachment shall be regulated by the following conditions:-

i) When standpipes are screwed, the screwing shall be of standard pipe thread.
ii) Standpipes shall be attached by one of the methods shown in Figures XII/84, XII/85(A,B,C),XII/85D,XII/85E,XII/85F,XII/86, XII/87, XII/88, XII/89 and XII/93 or by any other method approved by the Inspecting Authority.
iii) Where the standpipes are fabricated by fusion-welding they shall be stress relieved by heat-treatment before attachment to the boiler unless the whole boiler is subject to heat-treatment on completion.
iv) Where the bore of the standpipe does not exceed 5 inches or the diameter of the opening in the shell does not exceed 5 inches plus twice the thickness of the plate to which it is attached, the standpipe may be welded to the plate without subsequent heat-treatment of the weld so made. If these limits are exceeded the whole plate to which the standpipe is attached shall be stress relieved by heat-treatment on completion of welding.
 
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