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Reg.241
,Reg.242,Reg.243,Reg.243A 

Additional tests before rejection

Should either a tensile or bend test fail, two further tests of the type which failed may be made on test pieces cut from the same test rings. If the results obtained from these re-tests are satisfactory, the drum shall be accepted, provided that in other respects it fulfils the conditions of this Chapter. If these re-tests do not give satisfactory results the drum represented may be re-heat-treated together with the remainder of the test rings, and presented for further testing.

In all cases where final re-tests do not give satisfactory results, the drum represented by the test pieces which fail shall be rejected.



Reg.242

Discard

Sufficient discard shall be made from the top and bottom of each ingot to ensure soundness in the portion for forging.



Reg.243

Forging

 The forging shall be made from a solid cast ingot, punched, bored or trepanned, or alternatively, hollow, cast ingots may be used.  The resultant wall in the case of the solid cast ingot, or the wall of hollow ingot as cast shall be reduced in thickness by at least one-half in the process of forging.



Reg.243A

Tolerance

a)

The deviation from circularity in any section shall, in the case of normalised drums, not exceed 2% and in case of stress relieved drum 1%. The deviation from a straight line shall not exceed 0.3% of the cylindrical length.
b) In order to determine the deviation from circularity of the drums the maximum and minimum internal diameter at one cross section shall be measured. From these measured values the percentage deviation from circularity shall be calculated according to the following formula:-

C = 2(dmax – dmin) x 100
(dmax + dmin)

where,

C = percentage deviation from circularity of the drums.
d = internal diameter at one cross section.

In order to determine the deviation from a straight line, a stretched line should be placed longitudinally against the sides and its largest distance from the shell line concerned shall be measured. From this distance, and from the cylindrical shell, the deviation from the straight line shall be calculated.
 
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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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