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Reg. 353 A, Reg. 353 B, Reg. 353 C
FLANGES

Flanges of Carbon Steel Pipes

The material for carbon steel flanges, where forged, cast or cut from the plates (excluding branches forged integral with the pipes) shall be made of steel produced by an Open Hearth or Electric process or any of the Oxygen process.

Carbon steel flanges shall not be used for temperatures exceeding 454°C (850°F). Flanges shall be made without a weld and shall be free from lamination or other defects, they may be secured by screwing, riveting or welding.

Blank flanges shall be of mild steel or cast steel and shall be not less in thickness than the flanges to which they are attached. The material shall comply with the requirements specified in relevant regulations of Chapter II or Chapter V of these Regulations.


Reg. 353 B

Flanges of Alloy Steel Pipes

The material for alloy steel flanges, where forged, cast or cut from plates (excluding branches forged integral with the pipes), shall be made from the steel produced by an Open Hearth or Electric process. Flanges should be made without a weld and shall be free from lamination or other defects. The material of alloy steel flanges shall comply in all respects with the requirements of Regulation 234. The material for flanges shall be similar to that of the pipes to which they are to be attached. The flanges are to be so designed that the total stress induced in them does not exceed the maximum permissible stress as may be determined by the criteria laid down under Regulation 271.

Blank flanges of alloy steel be not less in thickness than the flanges to which they are to be attached. The material shall be similar to that of the flanges.

Reg. 353 C

Non-Ferrous Flanges

The material for non-ferrous flanges shall be of bronze. The chemical composition shall comply with the requirements of sub-clause (iv) of Regulation 282 (a). When flanges are attached to copper pipes by brazing, they shall be secured in such additional way (i.e. by riveting or forming a conical bore in the flange) so that the resistance to withdrawal from the flange does not depend wholly on the brazing.
 
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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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