2.7.2
Chemical Conversion Coating with Polyelastomer Finish Coat
Dip coils in a chemical conversion solution to molecularly deposit a
corrosion resistant coating by electrolysis action. Chemical conversion
coatings shall conform to MIL-C-5541, Class 1A. Cure conversion coating at
a temperature of 43 to 60 degrees C 110 to 140 degrees F for a minimum of 3
hours. Coat coil surfaces with a complex polymer primer with a dry film
thickness of 0.025 mm 1 mil. Cure primer coat for a minimum of 1 hour.
Using dip tank method, provide three coats of a complex polyelastomer
finish coat. After each of the first two finish coats, cure the coils for
1 hour. Following the third coat, spray a fog coat of an inert sealer on
the coil surfaces. Total dry film thickness shall be 0.064 to 0.076 mm 2.5
to 3.0 mils. Cure finish coat for a minimum of 3 hours. Coating materials
shall have 300 percent flexibility, operate in temperatures of minus 46 to
plus 104 degrees C 50 to plus 220 degrees F, and protect against
atmospheres of a pH range of 1 to 14.
2.7.3
Vinyl Coating
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NOTE: Include the paragraph below only in
PACNAVFACENGCOM projects.
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Apply coating using an airless fog nozzle. For each coat, make at least
two passes with the nozzle. Materials to be applied are as follows:
Total dry film thickness, 0.165 mm 6.5 mils maximum.
Vinyl Primer, 24 percent solids by volume:
One coat 0.051 mm 2 mils
thick
Vinyl Copolymer, 30 percent solids by volume:
One coat 0.114 mm 4.5
mils thick.
2.8
MOTORS AND STARTERS
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NOTE: Reduced voltage starters should be specified
when voltage-regulation problems are anticipated
including inadequate power supply, poor distribution
facilities, and presence of electrical or electronic
equipment sensitive to voltage fluctuation.
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NEMA MG 1, NEMA ICS 1, and NEMA ICS 2. Determine specific motor
characteristics to ensure provision of correctly sized starters and
overload heaters. Provide motors to operate at full capacity with a
voltage variation of plus or minus 10 percent of the motor voltage rating.
Motor size shall be sufficient for the duty to be performed and shall not
exceed its full load nameplate current rating when driven equipment is
operated at specified capacity under the most severe conditions likely to
be encountered. When motor size provided differs from size indicated or
specified, the Contractor shall make the necessary adjustments to the
wiring, disconnect devices, and branch circuit protection to accommodate
equipment actually provided. [Provide reduced voltage type motor
starters.] Provide [general-purpose] [weather-resistant] [watertight]
[explosion proof] type starter enclosures in accordance with NEMA ICS 6.
SECTION 15730N
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