Where covered electrodes are used they shall comply with the requirements of Regulations 94 to 98 save in the case of the weld metal as deposited, where the tensile strength shall not be less than the lower limit specified for the plate.

Crosstubes and uptake tubes shall comply with Regulations 127 and 128 respectively.

The manufacturer shall supply the Inspecting Authority with a fully dimensioned sectional drawing showing in full detail the construction of the boiler for approval before putting the work in hand.

Full details including dimensions of plate preparation for the longitudinal and circumferential seams shall also be shown on the drawing.

Fully dimensioned sketches showing in details the attachment for stand-pipes, branch pipes and seatings, the position of these attachments relative to the longitudinal and circumferential seams and other opening shall also be given in the drawing.

The edges of all plates, shall be machined or flame-cut by machine. Gusset plates may be sheared except on those edges, which are to be welded.

Plates which are to flame-cut by machine without subsequent heat- treatment, grinding or machining, shall not have a carbon content higher than 0.26 per cent. Where the carbon content exceeds 0.26 per cent, heat-treatment grinding or machining shall be carried out.

The edges of all plates shall have a smooth finish.

The welding edges of all plates shall be cleaned to a smooth metallic surface and shall be free of rust, oil or other foreign matter before welding is commenced.

The surfaces of the plates at the longitudinal and/or circumferential seams shall at no part be out of alignment with one another by more than 10 per cent of the plate thickness but in no case shall misalignment exceed 1/8 inch for longitudinal seams or 3/16 inch for circumferential seams.