coating applicator's standard procedures for the type metals involved.
Coating material shall be a resin base thermosetting type phenolic.
Phenolic coating shall be applied by immersion dipping of the entire coil.
Minimum of two coats shall be applied by immersion dipping. Coils shall be
baked or heat dried following each immersion. After final immersion and
prior to final baking, entire coil shall be given a spray coating of
phenolic with particular emphasis given to building up coating on sheared
edges. Completed coating shall show no evidence of softening, blistering,
cracking, crazing, flaking, or loss of adhesion. There shall be no
evidence of phenolic "bridging" between the fins. Minimum dry film
thickness of coating shall be 0.038 mm 1.5 mils.
2.9.2
Vinyl Coating
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NOTE: Include the paragraphs below only in
PACNAVFACENGCOM projects or when specifically
directed.
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Equipment shall be disassembled to extent necessary to provide access to
spray a special finish on the coil and fins
Exterior bare metal surfaces
of equipment shall also be provided with this special finish. Application
shall be by experienced applicators, at the premises of a company
specializing in such work, using an airless fog nozzle. At least two
passes shall be made with the nozzle over the surfaces to be painted for
each coat. Materials to be applied are as follows:
2.9.2.1
Mild Steel Surfaces
Self-curing, zinc filled, inorganic coating with 80, plus or minus 2
percent solids content by weight minimum: 1 coat, 0.076 mm
Lower temperature curing Epoxy-Polyamide, high build coating with 58, plus
or minus 2 percent solids content by volume of mixture components: 2
coats, 0.127 mm per coat
Self-curing, zinc filled, inorganic coating with 80, plus or minus 2
percent solids content by weight minimum: 1 coat, 3 mils
Lower temperature curing Epoxy-Polyamide, high build coating with 58, plus
or minus 2 percent solids content by volume of mixture components: 2
coats, 5 mils per coat
2.9.2.2
Non-Ferrous and Heat Exchanger Finned Surfaces
Total dry film thickness, 0.165 mm maximum
Vinyl primer 24, plus or minus 2 percent solids content by volume: 1
coat, approx. 0.051 mm
Vinyl copolymer 30, plus or minus 2 percent solids content by volume:
1 coat, approx. 0.102 mm
Total dry film thickness, 6.5 mils maximum
Vinyl primer 24, plus or minus 2 percent solids content by volume: 1
coat, approx. 2 mils
SECTION 15601N
Page 42
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