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Reg. 240 

Selection of Test Pieces

(a) All test pieces shall be selected by the Inspecting Officer and shall be tested in his presence and he shall satisfy himself that the conditions herein prescribed are fulfilled.



(b) Tensile test pieces

The tensile strength and percentage elongation shall be determined from round test pieces with gauge lengths of 5 do.



(c)  Tensile test 

(i)

The tensile strength and percentage elongation shall be in accordance with the requirements of regulation 9 and 16.
(ii) The upper yield point at room temperature shall be not less than 50% of the specified minimum tensile strength at room temperature. The minimum values of the stress at proof limit 0.2% at elevated temperature (Et) of the material may be calculated by multiplying the minimum specified tensile strength at room temperature (R20) by the value of the ratio (Et/R20) given in the table under regulation 16.

(iii)
The breaking elongation in percentage shall be not less than
100-Rm
2.2

where,

Rm = tensile strength at room temperature, in kgf/mm²
100 = quality index
2.2 = a constant which is valid only when Lo = 5 do

where,

do = original diameter of round test piece”.
Lo = gauge length



(d) Bend test pieces

Bend test pieces shall be of rectangular section 1 inch wide by ¾ inch thick. The edges shall be rounded to a radius of 1/16inch. The test pieces shall be bent over the thinner section.



(e) Bend Tests

The test pieces shall, when cold, be capable of being bent without fracture, through an angle of 180°, the internal radius of the bend being not greater than that specified in table below:-

  Internal radius of bend in inches
Upto 32 3/8
Above 32 and upto 36 ½
Above 36 and upto 38 ¾

Bend tests may be made by pressure or, by blows.

 
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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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