MIL-DTL-18492B (OS)
from the tank. After removal of the loads, the tanks', top rings and bottoms shall show no permanent
deformation.
3.15 Drop test. Upon completion of the drop tests in accordance with 4.5.4, the air tightness (3.13) and
serviceability (3.14) requirements shall apply.
3.16 Marking. All marking or stamping on the tanks shall be as shown on the applicable drawings.
Stamped or embossed lettering on the cover, body, and interior fittings of the tank shall be legible after
the tank has been completely finished.
3.17 Welding. All surfaces to be welded shall be thoroughly cleaned and shall be free from grease, paint,
or other foreign substances. All aluminum welding shall conform to the requirements as specified on the
applicable drawings, and in accordance with AWS D17/D17.2M, and NAVSEA S9074-AQ-GIB-
010/248.
3.18 Workmanship. Workmanship shall be that required by best commercial practices consistent with
quality production of analogous parts, maintaining dimensions, finishes, and tolerances specified herein
and on the applicable drawings and specifications. All components shall be sound and free from defects
which would deleteriously affect the strength and performance of the tank and cover assembly, and all
joints and seams shall be tight and sound. All surfaces shall be free from rough spots, sharp edges and
burrs, protrusions, dents, cracks, dirt, grease, rust, other foreign matter, or similar defects which might
interfere with the assembly of the tank components, loading of the tanks, interference with the stacking of
the tanks, cause injury to personnel, or damage to the contents during loading, unloading, handling, and
shipping. Exterior surface coatings shall be continuous and all required marking and stamping shall be
neat and sharply defined.
3.19. Preproduction sample. Unless otherwise specified in the contract or purchase order, preproduction
samples of the tanks and cover assemblies shall be manufactured using the methods and procedures
proposed for production. The sample shall be tested as specified in section 4 herein for the purpose of
determining that, prior to production, the supplier's production methods are capable of yielding items that
comply with the technical requirements of this specification and the contract or purchase order.
4. VERIFICATION
4.1 Classification of inspection. The inspection requirements specified herein are classified as follows:
(1) Preproduction inspection (see 4.3)
(2) Quality conformance inspection (see 4.4)
4.2 Sampling requirements. Inspection sampling requirements for Critical, Major and Minor
characteristics are defined in MIL-STD-1916. Unless specified otherwise, verification Level IV shall be
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