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Reg. 246
, Reg. 247, Reg. 248, Reg. 249

Steel Castings

Steel castings for pressure parts shall comply with Regulations 73 to 80 (28 to 35 tons per sq. in).



Reg. 247
FUSION WELDED DRUMS

Definition of term ‘Fusion Weld'

The term ‘Fusion Weld’ is, for the purpose of this Chapter, applicable to all welded joints made by the metal arc process with covered electrodes or other electric arc process in which the arc stream and the deposited weld metal are shielded from atmospheric contamination.

It is intended that this Chapter shall apply to the single run or heavy run welding process and that welded boiler drums manufactured by that process shall conform with all Regulations of this Chapter, excepting those in which divergence is necessary solely because of special requirements essential for the most efficient utilization of that process. Thus all Regulations governing quality of material, construction workmanship and testing (both non-destructive and otherwise) are applicable.

When welded drums ordered to this chapter are made by this single run or heavy run process it will be understood that Regulations 252 and 267 do not apply in their entirety.



Reg. 248

Equipment of Workshop

a)

The welding plant and equipment are to be of good quality and maintained in an efficient working condition. The welding apparatus is be installed under cover and arranged so that the welding work may be carried out in positions free from draughts and adverse weather conditions. The procedure is to be such that there is regular and systematic supervision of the welding works, and the welding operators are to be subjected by the works officials to periodic tests for quality of workmanship. Records of these tests are to be kept and are to be available to the Inspecting Officers for scrutiny.
b) The Works should be equipped with an efficient testing laboratory which should include apparatus suitable for carrying out tensile, bend and impact test micro-examination of specimens and X-ray examination of the actual joints in pressure vessels. The Works should also be equipped with a suitable heat treating furnace having satisfactory means for temperature control, but as an alternative arrangements may be made whereby the drums can be heat-treated elsewhere.





Reg. 249

Constructional details and preparation for welding

The manufacturer shall supply the Inspecting Authority with a fully dimensioned sectional drawing showing in full details the construction of the drum(s) for approval before putting the work in hand.

Fully dimensioned drawings of the proposed welds preparations of the main seams drawn to a scale which clearly shows all the relevant details shall be furnished.

Sketches showing details of the welds preparations for the attachment of the stand pipes, branch pipes and seatings and their locations relative to the longitudinal and circumferential seams and to other openings shall be furnished.

 
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