(a) The test specified in regulations 59 and 60 shall be made on minimum 2 tubes for first 100 and 1 per 100 or part thereof for tubes over 100 number.

(b) If any test specimen shows defective machining or develops flaws, it may be discarded and another specimen substituted.

(c) If any one or more tests specified in these regulations fail, two further tests of the same kind may be made on two other tubes of the same batch.  If any of these tests fails, the batch of the tubes represented may be given a further heat treatment and entire set of tests shall be repeated.

If the repeat tests are satisfactory the tubes shall be accepted.  If any failure in the tests should occur the entire batch of the tubes shall be rejected.