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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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