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Reg. 88
MATERIALS OF CONSTRUCTION

GENERAL GREY IRON CASTINGS (GRADE A)

Dimension of test bars

(a) Transverse Test Bars.- The transverse test bars of the diameter specified by the Inspecting Authority according to the main cross sectional thickness of the casting represented, shall conform to the following dimensions:

Diameter of test Bar
Limits of Diameter
Over all length
Main cross-sectional thickness of castings represented
Inch
inch
Inches
Inches
0.6
+0.045
10
Not exceeding 3/8
0.875
+0.065
15
Over 3/8 and not exceeding 3/4
1.2
+0.090
21
Over3/4 and not exceeding 1 1/8
1.6
+0.10
21
Over 1 1/8 and not exceeding 1 5/8
2.1
+0.10
27
Over 1 5/8

Bars cast to a size in excess of the limits given above may be machined to a diameter within the specified limits. Bars cast within these limits of diameter may also be machined before the transverse test is made, providing that the finished diameter falls within these limits.

(b) Tensile Test Bars.- The tensile test bars of the diameter specified by the Inspecting Authority, according to the main cross-sectional thickness of the casting represented shall conform to the dimensions shown in the following table. Bars may be tested with either plain or screwed ends.

The test bars shall be cast as parallel bars of the diameters given in Column B and then machined to the dimensions C and P in the above table.

(c) For castings over 2 inches in thickness a test bar of larger diameter than 2.1 inches may be used by agreement between the manufacturer and the Inspecting Authority. For diagram and table see under clause (b) of this Regulation.

 

 
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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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