coating shall be [0.2] [0.4] [0.6] [1.0] [1.5] [____] mm [8] [16] [24]
[40] [60] [____] mils, plus or minus 5 percent.
b. Pipe and joint coating for factory applied or field repair material
shall be applied as recommended by the manufacturer and shall be one of
the following:
(1)
Continuously extruded polyethylene and adhesive coating
system.
(2)
Polyvinyl chloride pressure-sensitive adhesive tape.
(3)
High density polyethylene/bituminous rubber compound tape.
(4)
Butyl rubber tape.
(5)
Coal tar epoxy.
2.2.12.1
Field Joints
All field joints shall be coated with materials compatible with the
pipeline coating compound. The joint coating material shall be applied to
an equal thickness as the pipeline coating. Unbonded coatings shall not be
used on these buried metallic components. This includes the elimination of
all unbonded polymer wraps or tubes. Once the pipeline or vessel is set in
the trench, an inspection of the coating shall be conducted. This
inspection shall include electrical holiday detection. Any damaged areas
of the coating shall be properly repaired. The Contracting Officer shall
be asked to witness inspection of the coating and testing using a holiday
detector.
2.2.12.2
Inspection of Pipe Coatings
Any damage to the protective covering during transit and handling shall be
repaired before installation. After field coating and wrapping has been
applied, the entire pipe shall be inspected by an electric holiday detector
with impressed current in accordance with NACE RP0188 using a full-ring,
spring-type coil electrode. The holiday detector shall be equipped with a
bell, buzzer, or other type of audible signal which sounds when a holiday
is detected. All holidays in the protective covering shall be repaired
immediately upon detection. Occasional checks of holiday detector
potential will be made by the Contracting Officer's representative to
determine suitability of the detector. All labor, materials, and equipment
necessary for conducting the inspection shall be furnished by the
Contractor.
a. Protective covering for aboveground piping system: Finish painting
shall conform to the applicable paragraph of SECTION: 09900 PAINTS AND
COATINGS and as follows:
b. Ferrous surfaces: Shop-primed surfaces shall be touched-up with
ferrous metal primer. Surfaces that have not been shop-primed shall be
solvent-cleaned. Surfaces that contain loose rust, loose mil scale,
and other foreign substances shall be mechanically-cleaned by power
wire-brushing and primed with ferrous metal primer. Primed surface
shall be finished with two (2) coats of exterior oil paint and vinyl
paint. Coating for each entire piping service shall be an approved
pipe line wrapping having a minimum coating resistance of 50,000 Ohms
per 0.0929 square meters square foot.
2.2.13
Resistance Wire
Wire shall be No. 16 or No. 22 nickel-chromium wire with TW insulation.
SECTION 13110A
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