| a) |
The pipes shall be made from
steel made by an Open Hearth or Electric Process or by
any of the Oxygen Processes. Hot finished seamless pipes
may, however, be made of Bessemer Steel. Bessemer Steel
shall not be used for pressures exceeding 21 kg/cm²
(300 lbs./in²) or temperatures exceeding 260°C
(500°F). If the Bessemer Process is used, the steel
shall be made by a manufacturer approved by the Inspecting
Authority.
When used for temperatures exceeding 399°C (750°F)
the steel shall be of non-segregated or fully skilled
type. |
| b) |
Carbon and alloy steel pipes shall not be used for
design temperatures exceeding those given in Table2 of
regulation 349.
|
| c) |
For design temperature over
427 °C (800 °F) special precaution shall be taken
to ensure that the surface condition of the pipe is suitable
for these requirements. |
| d) |
The material from which seamless
and electric resistance welded pipes are made shall conform
to the appropriate specification of tubes in Chapter
II. The materials from which butt welded pipes are
to be made shall conform to the requirements of Table
1 under Regulation 347. |
| e) |
Notwithstanding anything contained
in sub-regulation (a), the material specifications given
in this Chapter shall not apply to steam-pipes and fittings
used for conveying steam at a pressure not exceeding 1
kg/cm², the approval in regard to the quality of
the material being left to the discretion of the Chief
Inspector of Boilers. |
