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Reg. 282 A
GENERAL REQUIREMENTS

Materials, Temperature and Pressure Limits

(a) Materials:-

The materials used in the manufacture of the boilers of the fittings shall comply with the following requirements:-

(i) Steel castings shall comply with Regulations 73 to 80.
(ii) Steel forgings shall comply with Regulations 81 to 85.
(iii) Iron casting shall comply with Regulations 86 to 93.
(iv) Bronze castings shall comply with the following requirements, namely:-

Chemical composition   Grade A Grade B
Tin   5.5 to 8.0% 4 to 6 %
Lead   1.0 to 3.0% 4 to 6%
Zinc   3.0 to 6.0% 4 to 6%
Total of all elements other than those set out above and excluding Copper and incidental Nickel  

0.50%


0.50%
Copper plus incidental Nickel   Balance Balance
 

Physical  Properties

   
 

Ultimate tensile strength         

22kg/mm² (14.5 tons/sq.in.) 20.5kg./m (13 tons/sq.in.)
Sand cast  
(cast on)        
Elongation percent minimum on standard test piece C 8%  15%
 

Ultimate tensile strength

23 kg./mm²
(14.5 tons/sq.in.)
20.5kg/mm²
(13 tons/sq.in.)
Sand cast 
(separately cast)     
Elongation percent minimum on standard test piece C
12% 15%
(v) The seats and discs of valves shall be made of non-corrodible metal.
(vi) Alloy steel castings shall comply with the following requirements, namely :-

Carbon Molybdenum Castings

Chemical composition % 0.25 max.
Carbon 0.50
Silicon 0.20 to 0.50
Manganese 0.50 to 1.00
Molybdenum 0.40 to 0.70
Nickel 0.50 max.*
Chromium 0.20 max.*
Copper 0.30 max.*
Sulphur 0.05 max.
Phosphorus 0.05 max.
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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