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Reg. 424, Reg. 425, Reg. 426
TESTS FOR CLASS II FUSION WELDED SEAMS

Hydraulic and Hammer Test

This shall comply with Regulation 268.



Reg. 425
TESTS FOR CLASS II FUSION WELDED SEAMS

Determination for Working Pressure

The working pressure of cylindrical shells with fursion welded seams shall be calculated from the following formula:-

W.P. = (t-2) x S x C Equation (99)
D

Where,

t = thickness of shell plate in thirty-seconds of an inch.
D = internal diameter of shell in inches.
S = Ultimate tensile stress in tons per square inch.
C = 32 for Class I boilers.
C = 27 for Class II boilers.

In no case the thickness of cylindrical shells with fusion welded seams be less than those given in table below:-

Minimum thickness for Fusion Welded Shells

Class Internal diameter inches Minimum thickness inches
II Up to and including 24 ¼
Over 24 up to and including 36 5/16
Over 36 3/8

In no case shall the factor of safety of the cylindrical shell and ends be less than 4.




Reg. 426
TESTS FOR CLASS II FUSION WELDED SEAMS

Welds and compensation for manholes and branches

Welded compensating ring fitted to manhole and other openings shall conform to Figures 52 to 54 and Figures 55 to 56).

 
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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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