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Reg. 290

Chests etc., in General

a) All chests and fittings shall be smooth, sound and free from flaw, cracks or other injurious defects. After completion, the chests shall be tested hydraulically at the manufacturing works to at least twice the working pressure of the boiler for which they are intended.

Hydraulic test shall be made with water which may contain a corrosion inhibitor, with kerosene or which other suitable liquid provided its viscosity is not greater than that of water at a test temperature not above 52 C.
b) Valves may be fabricated from seamless steel pipes of pressure not exceeding 250 pounds per square inch and temperatures not exceeding 800ºF. The welding should conform to Regulation 125 and valve chest should be stress relieved after fabrication. Valves meant for use in pipe work may also be fabricated by welding from seamless steel pipes but no restriction as above regarding pressure and temperature shall apply to them provided the welding complies with all the relevant requirements of fusion welding such as stress relieving and radio-graphic inspection of the weld and the like prescribed in Chapter V of these Regulations.

The working pressure of the chests shall be determined by equation 91 or 91A, whichever is applicable, where the term ‘2 Se’ shall be substituted by the term ‘1.8 x S’ The wall thickness shall not be less than 3/8”. The fabricated valves with their assembled fittings shall withstand satisfactorily a hydraulic test to the same pressure as will be applied to the drum during its registration.
c) The working pressure and the thickness of Bronze and Cast Iron Valve chests shall be determined by the following formulae, subject to minimum thickness as specified in regulation 283 (b):

WP= R x ( T - C ) Eqn.(76)
4.5 x D

T = 4.5 x WP x D + C Eqn.(77)
R

Where,

R is the minimum specified tensile strength of the grade of the material.
D - is the external diameter of the chest.
T - is the minimum thickness of the chest, excluding tolerance and
C - is the minimum positive tolerance as specified here under:-

For Bronze Chests C = 1.5 mm
For Cast Iron Chests C = 5 mm

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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