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Reg. 34
MATERIALS OF CONSTRUCTION

COPPER PLATES, STAY AND RIVET BARS

Stay and Rivet bars

(a) Process.- To comply with  Regulation 33 (a).

(b) Chemical Composition.- To comply with  Regulation 33 (b).

(c) Freedom from Defects.- To comply with  Regulation 33 (c).

(d) Rolling Margin.- The bars in any part shall not be more than 1% over or more than ½% under the specified diameter.

(e) Tensile Tests.- The materials shall have the tensile properties shown in the following table:-

Tensile properties

Unturned rods (rods upto 1¼ inches dia.)
Turned rods (rod above 1¼ inches dia.)
Minimum tensile strength lb. per sq. inch. 32,400 32,400
Elongation, minimum per cent in 2 inches gauge length.
40
45

f) Bend Tests.- To comply with  Regulation 33(f).

(g) Dump Tests.- a piece of rod 1 inch long shall be placed on end and hammered or crushed down cold to a thickness of 3/8 inch without showing either crack or flaw on the circumference of the resulting disc.

(h) Number of Tests.- One bar, from which the required test specimens shall be taken, shall be selected at random from each batch of 50 (or part thereof) bars of each size from each melt. From each bar selected, one tensile test, one cold bend test, one hot bend test and one dump test shall be made.

 
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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