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Reg. 548, Reg. 549

Uptakes

 
The uptakes shall be formed from seamless or electric resistance welded or fusion butt welded pipes by electric arc process. The tolerances on these pipes shall comply with the requirements of Regulation 345. The uptakes shall be fusion butt welded to the upward flange of the opening of the furnace crown plate in accordance with Figures XII/3 and XII/4.The depth of the flange of the firebox crown plate opening from the commencement of the curvature of the flange shall be not less than twice the  of the curvature of the flange shall be not less than twice the plate thickness with a minimum of 1 inch. Unless the whole boiler is to be subsequently stress relieved the uptake and firebox crown plate shall be effectively stress relieved after welding. Where the firebox crown plate is also fusion welded to the body of the firebox as in Fig XII/15  the firebox complete with the uptake shall be effectively stress relieved by heat treatment on completion of all welding.

The uptake may be attached to the shell crown as indicated on Fig XII/16 before the boiler is finally stress relieved by heat treatment.

Where the vertical seam of the uptake is fusion welded the welding shall comply with Regulation 558 and the weld shall be so arranged that it is externally and internally see Fig XII/34 .

It is desirable that the uptake should be fitted with an internal cast iron liner extending below the low water level.




Reg. 549

Cross Tubes

Cross tubes shall be made from weldless steel pipes or from plate or strip rolled and electric resistance welded or fusion butt welded pipes by electric arc process. The fusion welding shall conform to the requirements of Chapter XII. Tolerances on these pipes shall conform to the requirements of Regulation 345.

The tubes shall be of sufficient length to project through the firebox plate not less than ¼ inch or more than 5/8 inch at any part of the circumference of the tube. The tubes shall be fusion welded in position, the holes in the firebox plate shall be suitably chamfered, and the seams shall be welded externally and internally (See Fig XII/34).

 
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