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Reg. 268

Hydraulic test at makers’ works

a)

Boiler drum and other cylindrical components having internal diameters greater than 600 mm shall be hydraulically tested on completion of manufacture at the makers’ works in the presence of Inspecting Officer to 1½ times the maximum working pressure without indication of weakness and defects.

b) All components which are not reasonably accessible for inspection after assembly into the boiler or have been tested hydraulically prior to welding at a pressure less than that specified in sub-regulation (a) shall be tested hydraulically to 1½ times the maximum working pressure before assembly into the boiler.
c) Tubular products that have been hydraulically tested to the required pressure prior to welding or ultrasonically tested shall not require further hydraulic testing as components provided they were joined during assembly by circumferential butt joint which have been welded and non-destructively tested as per relevant provisions of these regulations.
d) Components other than tubular products shall not require hydraulic testing before assembly into the boiler if the completed boiler is tested hydraulically to 1 ½ times the maximum permissible working pressure at site.
e) In case of drums, headers which are to be fitted with tubes, the test may be made before drilling of tube holes but after attachments of nozzles and similar fittings.
f) The test pressure shall be raised gradually under proper control at all times so that it never exceeds by more than 6% of the required pressure and maintained for 30 minutes whereupon the pressure shall be reduced to maximum allowable working pressure and maintained for sufficient time to permit close visual inspection for leakage of the pressure parts.
g) The temperature of water used as medium of pressure testing shall not be less than 20°C and more than 50°C.
h) In case of drums of ‘composite’ construction and partly riveted and partly welded seams or seamless forged drum shell with ends attached by fusion welding, the test pressure shall be the same as for fusion welded drums.
i) Should the hydraulic test reveal any defects in the welded steam, it shall not be repaired unless the Inspecting Authority permits to do so.
j) On completion of agreed repairs to a drum which has previously been stress relieved by heat-treatment, further heat-treatment, if required by the Inspecting Authority, shall be done and the drums shall again be subjected to hydraulic test.".
 
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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
Indian Boilers Act 1923 Ibr Forms Home Search Help Contact Us