1.4
FACTORY INSPECTION
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NOTE: Delete the paragraph when concrete plant only
is required. This specification is structured for
steel plant only, concrete plant only, or steel or
concrete plant at the Contractor's option. Among
the factors to be considered are initial cost,
maintenance costs, life expectancy, and possible
need for relocation during period of useful life.
Steel plant is generally more economical in first
cost than concrete plant; however, maintenance costs
may be higher. Concrete plant would have a higher
life expectancy in highly corrosive soils. Small
steel plants are suitable for relocation. Concrete
plant is considered as plant having outer walls of
concrete regardless of material used for interior
walls or partitions. Steel plants are considered as
plants having outer walls of steel and bottom of
steel or concrete (except that all-steel would be
needed for relocatable plants).
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Factory inspection shall include soundness of welds and water tightness for
tanks fabricated at the factory. The primary and finish shop painting
shall be inspected for pin holes or voids.
1.5
TREATMENT AND PAINTING
Except as otherwise specified, equipment shall be treated and painted in
accordance with the manufacturer's standard practice. All exposed surfaces
of ferrous metals, other than piping, including those to be submerged,
shall be sandblasted in accordance with SSPC SP 6 and shop coated with two
coats of epoxy polyamide conforming to SSPC Paint 16 applied to a minimum
dry film thickness of 0.20 mm 8 mils per coat. The maximum time between
coats shall be 72 hours. The following items shall be finished in
accordance with manufacturer's standard practice suitable for end use
environment: blowers, motors, gearmotors, motor-driven speed reducers,
shafts, [comminutor] [chlorinator] [hypochlorinator] and pushbutton
stations. Aluminum shall have an AA-CC-ZZ-A41 finish. Stainless steel,
stellite, and nonferrous metals shall not be coated. Exposed surfaces of
concrete tanks shall be provided with two coats of rubber-base paint, gloss
or semi-gloss, conforming to FS TT-P-95. Blower housing, [chlorinator]
[hypochlorinator] housing, and electrical control system enclosure shall be
cleaned and sanded. Any external marks or scratches that remain after
sanding shall be filled with an epoxy plastic resin and then ground smooth
leaving a smooth level surface. All surfaces of housings and enclosures
shall be coated with zinc-molybdate primer conforming to FS TT-P-645 and
finish coat conforming to MIL-E-24635 or FS TT-E-1593, color as directed.
All exterior surfaces of piping which is subject to total or intermittent
submersion shall be given a vinyl paint system is accordance with SSPC PS
4.02. All exterior surfaces of piping which is not subject to submersion
or which are buried shall be given a coal tar coating system in accordance
with SSPC PS 10.01.
SECTION 11375N
Page 19
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