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Reg. 63 A
MATERIALS OF CONSTRUCTION

COLD DRAWN ELECTRIC-RESISANCE-WELDED STEEL BOILER AND SUPERHEATER TUBES FOR DESIGN METAL TEMPERATURES NOT EXCEEDING 4540 C (8500 F)


(i) Material.- Material, tube grade and chemical composition for these tubes shall be in accordance with the appropriate clause of Regulation 58.

(ii) Manufacture.- Tube shall be manufactured as prescribed in Regulation 58(b) and subsequently cold drawn.

(iii) Tolerances.- Tolerance on thickness and outside diameter shall be as follows :

      Thickness           - Plus 7.5% minus 7.5%

      Outside diameter   Plus 0.5% minus 0.5%

       (With a minimum of 0.10 mm over and under).

      Tolerance on length shall be in accordance with Regulation 58(f).

(iv) Heat Treatment.- After final cold finishing the tubes shall be heat treated as follows :

Tubes Grade

Heat treatment

WC 1

Normalized* or sub-critically annealed#

WC 2, WC 3

 

Normalized*

 

The ends which are subjected to cold working operation shall be suitably normalized or sub-critically annealed as above.

*Temperature range 880 Deg.C to 940 Deg.C.

# Temperature range 660 Deg.C to 720 Deg.C.

(v) Tests.- (a)Tensile Test. This test shall be comply with the provision of Regulation 60.

(b) Flattening test. This test shall comply with the provision of Regulation 59(a).

(c) Flaring test. This shall comply with the provision of Regulation 59(b).

(vi) Hydraulic test.- This shall comply with the provision of Regulation 61.

(vii) Test specimens.-These shall comply with the provision of Regulation 62.

(viii) Number of tests.- These shall comply with the provisions of Regulation 63

 

 
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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