MIL-DTL-18492B (OS)
3.11 Interior fittings. The interior fittings shall be true to form and all surfaces and edges shall be smooth
and free from projections, sharp edges, rough spots, and similar defects that would tend to damage the
contents, interfere with the assembly or loading of the tanks, or injure personnel. All supporting and
positioning fittings shall be concentric, and the bottom surface on which the fittings rest shall be
perpendicular, within the tolerances specified on the applicable drawings, to the axis of the fittings so that
the contents will be properly aligned in the tank. Where multiple diaphragms are used, diaphragms shall
be parallel and at right angles to the axis of the tank within the tolerances specified on the applicable
drawings. If an extractor is used in the cartridge tanks, the extractor shall slide freely between the tank
body and the cartridge case to ensure easy withdrawal of the cartridge.
3.12 Cleaning, preparation of surfaces, and painting.
3.12.1 Exterior surfaces (cover assembly). All aluminum surfaces to be painted shall have a chemical
film applied by treatments and products in accordance with MIL-DTL-5541, Class 1A. The chemical
films shall be produced by treatments controlled and operated to give a uniform product and shall be
continuous and free from breaks, scratches, and other damage affecting the serviceability of the film.
3.12.2 Exterior surfaces (tank). Exterior surfaces of the tank shall be prepared in accordance with the
applicable drawings to ensure good paint adhesion and good welds.
3.12.3 Faying surfaces. All faying surfaces which are not welded shall be coated with Primer Coating,
TT-P-1757, color Y. Each surface shall be allowed to dry hard before assembly.
3.12.4 Painting. Exterior surfaces shall conform to the requirements specified on the applicable drawing,
MIL-E-16663, and FED-STD-595. Enamel dry film thickness shall be 1.5 to 2.0 mils. The contacting
surfaces between moving parts shall not be painted (see Section 3.9).
3.12.5 Corrosion resistance and paint adhesion. When tested in accordance with 4.5.5, the treated and
painted tanks and cover assemblies shall withstand exposure to salt spray testing as specified in 4.5.5.
Paint film shall show no evidence of wrinkling, blistering, cracking, powdering, or flaking in areas
adjacent to the scribing, nor shall there be any evidence of corrosion on any other exposed surface of the
tanks or tank covers when tested in accordance with FED-STD-141 and ASTM B117.
3.13. Air tightness. All tanks and cover assemblies shall be capable of withstanding the internal air
pressure tests of Sections 4.5.1 and 4.5.2 without evidence of any structural weakness or permanent
deformation. Formation of air bubbles shall be sufficient evidence of leaks serious enough to reject the
tank or cover assembly.
3.14 Serviceability. While weight loaded and tested in accordance with 4.5.3, the cover assemblies of the
tanks shall be easily tightened, loosened, applied or removed, and the contents shall be easily removed
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