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Reg. 542, Reg. 543, Reg. 544

Stress Relieving

For the purpose of relieving internal stress all plates which have been dished, flanged or locally heated shall afterwards be, annealed unless during the last stage of manufacture they have been uniformly heated throughout.



Reg. 543

Cylindrical Shells

Except where the design incorporates flat tube plates in the shell, each ring shall be formed from not more than two plates and bent to cylindrical form to the extreme ends of the plate. The bending shall be done entirely by machine. Local heating or hammering shall not be used.

The longitudinal seam or seams may be placed in any suitable position but the seams in successive rings shall not fall in line.

In the case of brick set boilers the seam or seams shall be kept as far as practicable clear of the brickwork.



Reg. 544

Circularity

The difference between the maximum and minimum internal diameters of the shell measured at any one cross section shall not exceed 1 per cent of the nominal internal diameter.

The profile as measured on the outside of the boiler by means of a gauge of the designed form of the exterior of the boiler, having a length equal to one quarter of the internal diameter, shall not depart from the designed form by more than the percentage given in Table XII/1.

TABLE XII/1
Maximum percentage departure from designed form of welded boilers

Nominal internal diameter of boiler D Maximum departure from designed form

Inches

Per cent

Up to and including 36 0.375
Over 36, up to and including 45 0.350
Over 45 0.300

There shall be no flats at the welded seams and any local departure from circularity shall be gradual.
 
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