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Reg. 33
MATERIALS OF CONSTRUCTION

COPPER PLATES, STAY AND RIVET BARS

Plates

(a) Process.- The copper shall be fire-refined or electrolytic and hot-rolled from suitable cakes.

(b) Chemical Composition.- The chemical composition of the plates shall be as follows:-

Per cent.
Copper 99.2 minimum
Arsenic .30 to .50
Antimony 0.05 maximum
Bismuth 0.05 maximum
Oxygen 0.10 maximum

(c) Freedom from defects.- The plates shall be clean, smooth and free from defects and shall have a workmanlike finish. They shall be thoroughly annealed.

(d) Rolling Margin.- No plate shall be under the specified thickness at any part, not more than 5% over the calculated weight. The scrap margin, partly sheared and left attached, shall be not less than 3 inches at the ends and 1½ inches at each side.

(e) Tensile Tests.- One tensile test shall be taken from each plate as rolled.

The tensile breaking strength, from Standard Test Piece A, shall not be less than 14 tons per sq. inch with an elongation of not less than 35%.

(f) Hot and Cold Bend tests.- One hot (temperature between 1200°F and 1400°F) and one cold bend test shall be taken from each plate as rolled.

For either hot or cold bend tests, the test piece shall withstand being doubled over without fracture until the sides are touching and parallel.

 
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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