edition of MIL-HDBK-1004/10, "Electrical Engineering
Cathodic Protection."
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Underground coated steel piping shall have cathodic protection with test
stations as specified in Section [13110N CATHODIC PROTECTION BY GALVANIC
ANODES] [13111N CATHODIC PROTECTION BY IMPRESSED CURRENT].
2.1.11
Protective Coating Materials for Aboveground Pipe and Tanks
Coatings shall be the products of one manufacturer and coating application
procedure shall be in accordance with manufacturer's instruction. Tank
surface preparation shall be abrasive blast clean steel surfaces in
accordance with SSPC SP 10 to a surface profile of 0.013 to 0.051 mm 1/2 to
2 mils.
2.1.11.1
External Coatings
Protect aboveground piping and steel tanks against atmospheric corrosion
with a coat of organic, lead and chromate free, zinc-rich primer conforming
to SSPC Paint 20, Type II applied to a minimum dry film thickness of 0.102
mm 4 mils and finish with two coats of epoxy-polyamide topcoat conforming
to MIL-P-24441. Apply a gray first topcoat conforming to MIL-P-24441/2,
Formula 151 applied to a minimum dry film thickness of 0.076 mm 3 mils and
finish with a white second topcoat conforming to MIL-P-24441/3, Formula 152
applied to a minimum dry film thickness of 0.076 mm 3 mils resulting in a
total system minimum dry film thickness of 0.28 mm 11 mils.
2.1.11.2
Internal Coatings
Internally coat tanks larger than 76 cubic meters 20,000 gallons. Prior to
coating tank interior, seal unsealed lap seams with epoxy cement conforming
to DOD-C-24176, Type II. Fill voids that are inaccessible to brush applied
coatings with epoxy cement prior to coating application. Provide a [three
coat epoxy-polyamide system conforming to MIL-P-24441] [two coat epoxy
resin system conforming to MIL-C-4556]. Coat tank bottom and up 457 mm 18
inches on all sides.
a.
[MIL-P-24441 System: Provide MIL-P-24441/1, Formula 150 primer,
MIL-P-24441/2, Formula 151 intermediate coat and MIL-P-24441/3,
Formula 152 topcoat. Apply each coat to a minimum dry film
thickness of 0.076 mm 3 mils resulting in a total system minimum
dry film thickness of 0.25 mm 10 mils.]
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NOTE: Specify Composition L coating for use in
areas with regulations controlling the emission of
solvents into the atmosphere.
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b.
[MIL-C-4556 System: Composition [G, General] [L Limited] use.
Apply each coat to a minimum dry film thickness of 0.076 mm 3 mils
resulting in a total system minimum dry film thickness of 0.18 mm
7 mils.]
SECTION 15192N
Page 18
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