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|  MIL-T-18847C(AS)
eliminate any deficiencies in the rejected tanks. A tank incorporating the
corrective action shall be resubmitted for retest. Upon satisfactory retest,
the rejected tanks may be submitted for acceptance under the contract upon
concurrence of the Government Inspector, based on evidence submitted, that any
necessary corrective action has been incorporated into the tanks.
4.5 Satisfactory performance. The failure of a tank to meet the specified
requirements of any of the following tests and inspections shall constitute
failure of the tank. Rejected tanks shall not be resubmitted for inspection
without furnishing to the Government Inspector full particulars concerning
previous rejection and the measures taken to overcome the defects. Upon
resubmission of the tank for inspection after a failure, the inspection shall
start at the beginning of the test during which failure occurred.
4.6 Test methods.
4.6.1 Examination of product. The tank shall be examined for conformance
with the requirements of this specification with respect to materials,
workmanship, design, interchangeability, exterior surface, construction,
external finish, markings, smoothness, and applicable drawings.
4.6.1.1 Finish. The finish of both type tanks shall be examined for
uniformity of the protective cover, proper degree of hardness, and for proper
match with the specified color and finish adhesion.
4.6.1 .1.1 Uniformity of cover. The entire outer surface shall be visibly
examined for uniformity of the external finish. There shall be no bare spots,
blowholes, thin flows, or thick flows.
4,6.1 .1.2 Finish hardness. The hardness of the outer finish on all tanks
or a representative cured specimen of the same coating mix shall be tested in
accordance with FED-STD-141, Method 6212. If the finish hardness test is
tested on the tank, the finish shall not be marred by the test.
4.6.1 .1.3 Finish color. A color of an outer finish on all tanks shall be
inspected by a government representative and shall be judged for satisfactory
color.
4.6.1 .1.4 Finish adhesion. The first article and each lot sample shall be
tested in accordance with FED-STD-141, Method 6301. Any evidence of peeling
shall be cause for rejection of the lot.
4.6.2 Weld quality inspection. Tank designs that incorporated a welded
metal liner or any other structural welded joints shall be inspected and
conform to the following acceptance criteria.
4.6.2.1 X-ray inspection. X-ray inspection shall be performed on a
5 percent sample basis. The sample shall be based upon the number of tanks to
be furnished on each lot and shall be representative of the entire production
lot. Failure of the sample to comply with the weld acceptance criteria shall
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