Message from
Chairman of Central Boilers Board


About Central Boilers
Board


History of Indian Boiler Regulations

Foreword

Contents Chapter
Wise


Contents Regulation
Wise


List of Amendments

Indian Boilers
Act 1923


Ibr Forms

Home

Search

Help

Contact Us

Reg. 343
STEAM-PIPES AND FITTINGS


Pipes

1) Steam-pipes may be carbon steel, cast steel, alloy steel and in some cases of copper. Steel pipes may be solid drawn (cold or hot finished), butt welded or electric resistance welded. Copper pipes shall be solid drawn and no pipe made from electro-deposition of copper on a mandrill shall be used for steam delivery.

Provided that subject to satisfactory flattening test, pipes to IS:1239 of 13mm to 51mm nominal bore for working pressure up to 10.5 kg/cm2 at saturation temperature shall be allowed for use for the pipes.

2)

Where, however, material used is in conformity with the code of the country of manufacture and it is covered by these regulations, the permissible stress figures specified in the code at different temperatures may be accepted in lieu of figures computed from the data required to be furnished under Regulation 350. In any of the following cases:-

(i) Where a certificate is furnished from the Inspecting authority to the effect that the steel complies with requirements of the grade steel (to be specified) and that the permissible stress for the working conditions as allowed for in the code of the country of manufacture falls within the limits permissible under the Regulations.
(ii) Where the basis upon which these stresses have been arrived at is made available and such basis is not found to be such as to give rise to stresses higher than those permissible under the Regulations.

Where pipes have to be fabricated by longitudinal fusion butt electric arc welding of plates rolled to shape, the limits prescribed for butt welded pipes in Table 2 under Regulation 349 shall not apply. The requirements other than those relating to the minimum thickness of shell for fusion butt welding prescribed in Chapter XII shall be applicable to such pipes.

 

3)

Notwithstanding anything contained in Chapter VIII, the hydraulic test for pipes in maker's premises may be dispensed with by the Inspecting Authority:

Provided that these pipes have been fully tested by approved radiographic or ultrasonic techniques:

Provided further that in the case of pipes having internal diameter 600mm and more, the plates used for the manufacture of pipes and the long seam welds of pipes are fully tested by approved non-destructive test; for example, ultrasonic or radiographic testing and the soundness of pipes both in the parent material and in the weld is established in the maker's premises; and the whole component of the pipes, after completion of any further fabrication and erection at site, are hydraulically tested at a pressure not less than 1.5 times the design pressure of the piping system:

Provided also that in the event of detection of any defect after conducting hydraulic test of these pipes at site, it shall be the responsibility of the manufacturer to repair or replace the defective pipes, as may be deemed necessary by the Inspecting Authority.

 
4) Electric fusion welded pipes in which the butt welds are fully radiographed or ultrasonically tested need not be hydraulically tested in the shops provided the pipe system as a whole is hydraulically tested at site to the requisite test pressure in accordance with regulation 374.
5) In the case of fusion welded pipes test plates to represent all welded seams shall be attached at each end of longitudinal seam and tested in accordance with the requirements of Chapter XII except that one test plate may represent a lot of pipes up to 60 metres in length and of the same grade of material and same thickness of the pipe subject to the same heat treatment.
 
Back   Top
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
Indian Boilers Act 1923 Ibr Forms Home Search Help Contact Us