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Reg. 365 A, Reg. 365 B
STEAM RECEIVERS, SEPARATORS, CATCH WATERS, ACCUMULATORS AND SIMILAR VESSELS

Materials

1) Plates, Bars, Sections and Rivets.- Materials for plates, bars, sections and rivets used in the construction of Steam Receivers, Separators, Catch Waters and Similar Vessels shall comply in all respects with the requirements of relevant regulations of Chapters II and V, depending upon the mode of construction.
2) Branches, Bosses and Drain Pockets.- Branches, bosses and drain pockets may be solid forged, fabricated by fusion welding, machined from solid bars or made from tubes.
3) Flanges.- Materials for flanges shall comply with the appropriate provisions of Regulation 353.
4) Forgings.- Materials for flanges shall comply with the appropriate provisions of Regulation 243.
5) Steel Castings.- Steel castings for shells or pressure parts of shell shall comply with Regulations 73 to 80



Reg. 365 B

Construction and Workmanship

1) Shell Ends:– Shall ends formed separately from the shell may be dished or flat. Alternatively, the ends of the shell may be forged down and closed by manhole doors or by plugs or branches welded-in.
2) Dished Ends:- Each dished end shall be made one from rolled plate. If this is impracticable, owing to the large diameter, the dished end plate may be made from two plates fusion butt welded together, and in such cases the line of weld shall be parallel to the horizontal axis of the vessels and the weld shall be radiographed after forming. The shape of Dished End shall conform to the requirements of Regulation 275. Dishing and peripheral flanging shall be done by machine. Coiled flanging shall not be adopted. All plates which have been dished, flanged, or locally heated shall afterwards be efficiently heat treated for the purpose of relieving internal stresses, unless during the last stage of manufacture, they have been uniformly heated throughout to a suitable temperature. Care shall be taken to see that the flanges are cylindrical of good surface and free from local irregularities.

Where flats are pressed in dished ends for the attachment of connections they shall be formed with an ample radius at the junctions of the flat and curved surfaces and shall be free from sharp corners and tool marks.

Dished ends shall be attached to the cylindrical part of the shell by one of the following methods:-

i) Riveting:- Dished ends shall be machined to fit closely into the cylindrical part of the shell and flogging or hammering in the fitting of ends shall not be adopted. The caulking edges of all flanged plates shall be machined or flame cut by machine.
(ii) Welding with butt joints of the single or double U or V type:- Where the internal diameter of the shell in 24 ins. or over, the joints shall, in all cases, be welded from both sides of the plate. Where the internal diameter of the shell is less than 24 ins., the joints may be welded from one side only, when efficient welding from inside is considered impracticable.
(iii) In the construction of unfired boilers when the dished ends do not form of the heating surface, cold spun dished ends conforming to IS:2825 may be used.
3) Flat Ends:- Flat ends shall be of forged steel or plate steel and shall be welded to the cylindrical part of the shell or bolted to flanges which shall be attached to the cylindrical part of the shell in accordance with Regulation 356 or 357.

The attachment of flat ends shall be by one of the methods shown in Figure Nos. 365/2, 365/2A, 365/3 and 365/4.

When ends are attached as shown in Figure 365/4, welding shall be from both side of the shell plate where practicable. Where welding is done from one side only, care shall be taken to ensure full penetration using backing strips.
 
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