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Reg. 349

STEAM-PIPES AND FITTINGS

The pressure and temperature limits within which pipes, tees, branches, etc., shall be used, shall be in accordance with Table 2.

TABLE 2
Maximum permissible working pressure and temperature

Material Method of manufacture Maximum permissible working pressure Maximum permissible temperature Form
°C °F  
Carbon steel Cold drawn seamless No restriction 454 850 Straights, bends or fittings.
Hot finished seamless Do 454 850 Do
Butt welded [Max. nominal bore allowable 102 mm. (4 in)] 21 kg/cm²
(300 lb./sq. in.)
260 500 Do
Electric resistance welded No restriction 454 850 Straights
Cast steel Castings No restriction 454 850 Straights, bends or fittings
Molybdenum steel Cold drawn seamless and castings. No restriction 524 975 Do
Chromium molybdenum Steel Cold drawn seamless and hot finished seamless No restriction 621 1150 Do
Copper Solid drawn up to and including 127 mm.(5 in.) dia. 12.6 kg/cm² (180 lbs./sq.in.) Not allowed for superheated steam Straights and bends.
 
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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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