MIL-DTL-917F(SH)
3.14.2.2 Parts not to be painted. The following parts shall not be painted. Except for grounding contact
surfaces and machined metal-to-metal fits, corrosion resistance shall be required and shall be achieved by the use of
inherently corrosion-resistant materials, by processes other than painting, or through the nature of the application
(example: parts normally covered with grease or oil-film).
a.
Grounding contact surfaces (including equipment mounting pads, feet, and so forth).
b.
Machined metal-to-metal fits.
c.
Parts which if painted, would not function properly.
d.
Sealing surfaces of gaskets and packing.
e.
Heat exchanger surfaces of water air-cooled equipment.
f.
Identification, operating, safety, and warning label plates.
g.
Oil holes, grease cups, and grease pipes of machinery.
h.
Surfaces that make contact with oil or grease.
i.
Bearings and bearing surfaces.
j.
Electric wire coils and windings.
k.
Commutators, collector rings, brushes, brush holders, and brush rigging.
l. Peripheries of rotating parts of motors and generators and any areas on these parts from which the paint
might be thrown by centrifugal force.
3.14.2.3 Normal painting procedure. Except for large parts temporarily stored outdoors (see 3.14.2.4), the
sequence of operations shall be as follows:
a.
Complete fabricating operations, such as welding, machining, drilling, and tapping.
b.
Remove welding flux.
c.
Remove grease, oil, and dirt by solvent wiping, vapor degreasing, or caustic washing and rinsing.
d.
Remove rust and other visible corrosion products.
e.
Apply chemical pretreatment in accordance with Type I or II of TT-C-490 or TT-P-645.
f.
Apply primer and then topcoat.
3.14.2.4 Large ferrous metal parts stored outdoors temporarily. One of the following procedures shall be used
when large ferrous metal parts are stored outdoors temporarily, prior to welding and machining operations:
Procedure 1:
a.
Prior to storage out-of-doors:
(1) Remove welding flux.
(2) Remove grease, oil, and dirt by solvent wiping, vapor degreasing, or caustic washing and rinsing.
(3) Remove rust and other visible corrosion products by abrasive blasting to near-white metal in
accordance with SSPC-SP 10.
(4) Apply chemical pretreatment in accordance with Type I of TT-C-490, one coat of MIL-PRF-24712 or
primer coating in accordance with TT-P-645, and two coats enamel topcoat in accordance with Type III, Class 2 of
MIL-DTL-15090. MIL-PRF-24712 is the preferred coating system.
b.
After storage out-of-doors:
(1) Complete all fabricating operations, such as welding, machining, drilling, and tapping. Remove paint,
if necessary, before welding.
(2) Repeat steps a(1), a(2), and a(3).
(3) Remove all damaged paint and touch up with pretreatment and primer (see table XIX).
(4) Apply topcoat.
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