(a) Additional tests before rejection.- Should any
of the original test pieces fail to pass the mechanical tests,
two further samples which represent the same casting or castings
shall be selected and tested in the same manner. The manufacturer
shall have the right, if he so desires to re-heat-treat the
castings before the two further samples are selected.
Should the two further tests satisfy the requirements of
this standard, castings represented by them shall be accepted.
Should either of the re-tests fail, the castings represented
shall be liable to rejection.
(b) Hardness test after heat treatment.- The Inspecting
Officer may call for hardness testing of the heat-treated
(c) Non-destructive tests.- The Inspecting Officer
may call for radiographic examination or other non-destructive
testing of the castings.
Castings found to be unsound may be treated in accordance
with regulation 75.
If the welding repairs are sanctioned by the Inspecting Officer,
they shall be carried out in accordance with regulation
High class casting for which a factor greater than 80% is
taken in computation of permissible working stress shall be
subject to the following inspection requirements:
(i) Each casting shall be examined by radiographic or ultrasonic
methods at all critical locations and found free from harmful
defects. All the castings shall be fully machined to such
an extent that all critical sections are exposed for full
(ii) All castings shall be examined at all critical locations
using magnetic- particle or penetrant-fluid procedure, or
by grinding or machining or etching.
(iii) Castings found to be defective shall be rejected or
repaired to the satisfaction of the Inspecting Authority.
If repairs by welding are carried out the casting shall be
subsequently stress-relieved or heat-treated. Castings found
to be unsound may be treated in accordance with regulation
80. Repaired areas of castings shall be re-examined by the
Inspecting Officer in accordance with sub-clause (i) and shall
be shown to be free from harmful defects.
(iv) Castings to which a quality factor of 0.90 is assigned
shall be clearly and permanently marked with a suitable symbol
after being examined as above and found satisfactory.
Note:- The provisions of the first paragraph of clause (c)
of regulation 79
shall apply to the castings other than high class castings
for which a factor greater than 80% is used in the computation
of permissible working stress for shells of Boiler and integral
superheater Drums and Headers under