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Reg. 264
, Reg. 265 A, Reg. 265 B

Additional tests before rejection

a)

Should any of the test specimens taken in accordance with Regs. 257 to 263 fail to meet the specified requirements one retest shall be allowed for each specimen that fails, provided the following minimum figures have been obtained:

i) Reduction in area 30 per cent.
ii) Any other test except the bend and impact tests, 90 per cent of the specified requirements
b)

If a cold bend specimen should fail to meet the specified requirements, two re-tests shall be taken from the same test plate and these shall comply with the requirements of Regulations 261 and 262.

c) If an Izod impact test fails to meet the specified requirements, two re-tests shall be taken from the test plate, one each side of the original specimen and separated from it by not more than 5mm. Both re-tests shall show a minimum Izod impact test value of 20 ft. lb.
d) If it be found there is insufficient metal to permit the preparation of specimens for re-test from the remainder of the test plate from which the original specimen was taken the specimen for re-test may be cut from the test plate relating to the opposite end of the same longitudinal seam.



Reg. 265

Non-Destructive Tests

(a) Micro and Macro Examination


Micro and macro examination A specimen, the full thickness of the plate and not less than 13mm wide may be taken from each set of test plates by the Inspecting Authority for the purpose of micro and macro examination.

Macro-etching of a complete cross-section of the weld including the heat effected zone, should show satisfactory penetration, fusion and absence of significant inclusions or other defects.  In case of a doubt as to the condition of the weld as shown by micro-etching, the area concerned is to be microscopically examined for defect investigation.



Reg. 265

(b) Radiographical Examination

Every portion of the longitudinal and circumferential welded joints of the drums shall be subjected to radiographical examination or ultrasonic examination. Where ultrasonic examination is used, it shall be demonstrated to the satisfaction of the Inspecting Authority that the equipment and the technique used are satisfactory. The manufacturer shall ensure that the operator employed is competent to use the equipment, apply the technique and interpret the results of the examination.

The method employed in obtaining the radiographs shall be such as to show clearly defects having a magnitude equal to 2 per cent of the thickness of the welded joint. To determine whether this result is being obtained and indicator of approved form which includes a portion equivalent to not more than 2 per cent of the joint thickness, shall be placed in the vicinity of the weld so as to make a record on each radiograph.

Each section of every weld shall be marked so that the radiographs can be easily correlated to the particular part of the joint represented.

The examination shall be made from the original films and the acceptability of the welds shall be decided by the Inspecting Authority. The welds deemed unsatisfactory shall be rejected or dealt with under Regulation 266 and be radiographed again.

 
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