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  Reg. 374

STEAM-PIPES AND FITTINGS

Test Pressure

a)

Each completed pipe and fitting shall be tested by hydraulic pressure as per requirement of Chapter II.
b) Pipes and fittings with flanges for steam pressure exceeding 7 kg/cm² (100 lbs. per sq. in.) shall be tested with blank flanges bolted or clamped on. All other pipes, if straight, may be tested between the heads of an ordinary hydraulic pipes testing machine.
c) The piping system shall, after erection, be subjected to a hydrostatic test pressure. The hydrostatic test pressure at any point in the piping system shall not be less than 1.5 times the design pressure but shall not exceed the maximum allowable test pressure of any non-isolated components such as vessels, pumps or valves. At no time during the hydrostatic tests shall any part of the piping system be subjected to a stress greater than 90% of its yield strength (0.2% off set) at test temperature.

Notwithstanding anything contained in this clause, for boiler external piping and non-boiler external piping which are open to atmosphere such as vent and drain pipes, the hydraulic test for the portions of such pipes located beyond the last isolation valve may be dispensed with provided the weld joints in the pipe under reference are tested 100% by approved non-destructive examination and found satisfactory.

d) Special arrangements shall be made, according to circumstances, for testing bends and other fittings which are not flanged.
e) Hydraulic testing of butt welded and socket welded joints shall be conducted either at maker’s work or at user’s premises on completion of fabrication of pipes by the Inspecting Authority.
f) Hydraulic testing of fabricated pipes having attachments of flanges, fittings, butt joints, branch joints and weldolets shall be done at manufacturer’s works or alternatively at site at 1.5 times the design pressure. Where hydraulic testing of fabricated pipe joints is not carried out at manufacturer’s works, dye-penetrant test shall be carried out on the welded joints alongwith five percent radiography of such joints.

 
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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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