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Reg. 235
, Reg. 236, Reg. 237 , Reg. 238, Reg. 239
SEAMLESS FORGED DRUMS

Manufacture

a)

Carbon Steel for seamless forged Drums shall be made by the open-hearth or electric furnace or basic oxygen process or any other process which gives steel having equivalent properties.
b) Forging which may have integral ends, ends closed by means of dished plates, open ends for multi-joints drums or any combination of these shall be made from solid cast ingot which is punched, bored or trepanned, or from a hollow cast ingot and shall comply entirely with the relevant requirements of Chapter II.


Reg. 236

Chemical Analysis

The steel shall not contain more than 0.050 per cent of sulphur or of phosphorus.



Reg. 237

Freedom from defects

The drum shall be free from surface defects and shall be machined to the prescribed dimensions. 

Defects in forgings shall not be repaired without the previous sanction of the Inspecting Officer.

Where not machined, the forgings shall be workman like surfaces as normally obtained by hot working. Provided that the minimum specified thickness is maintained, minor surface defects may be admitted and other defects removed by mechanical means so as to achieve a smooth surface. Surface defects may be repaired, by welding only, with the approval of the Inspecting Authority provided that the drum is stress relieved after welding, wherever necessary.



Reg. 238

Heat Treatment

Each drum shall be efficiently heat treated:

a) At various stages during manufacture, as required
b) On completion of the forging process but prior to the hydraulic test.


Reg. 239

Mechanical Tests

Material shall comply with the mechanical tests herein specified.
Sufficient material shall be left on the open end or ends of each forging to enable tangential test pieces to be taken. These tests shall consist of not less than one tensile and one bend test from each open end. In the case of drums with open ends the test material shall not be parted off before heat treatment. If the drums are closed in at the ends the test rings shall be parted off immediately before this operation; subsequently the test rings and the forging shall be similarly, and simultaneously heat treated in the same furnace.

   
 
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Message from Chairman of Central Boilers Board About Central Boiler Board History of Indian Boiler Regulations Foreword Contents Chapter Wise Contents Regulation Wise List of Amendments
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