| Tweet |
Custom Search
|
|
|
||
 (2) In seawater tanks and fuel tanks, completely paint corrosion-resistant steel (CRES) and copper
alloy piping to minimize the effect of galvanic corrosion on the coated tank surfaces. Copper-bearing
piping and components shall be painted only after adequate masking of rubber items, gaskets, filters,
heat exchange surfaces, and critical sealing surfaces.
e. Dissimilar Metal Surfaces:
(1) The most effective methods for preventing bimetallic corrosion are careful design and correct
assembly. Excellent workmanship is required to insulate dissimilar metals effectively. Properly applied
films of specified paints and insulation tapes will increase durability and prevent corrosion.
(2) For insulation material to function effectively it must be installed so that all joints are closed; this
ensures that water cannot collect and form a bridge between steel and aluminum. For ships in service
where no insulating tape appears to have been used, or where existing tape has deteriorated, horizontal
joints exposed to the weather shall be sealed with calking compound.
been approved for use on shipbottoms are listed in Appendix A. These proprietary coatings shall be
applied as recommended by the manufacturer except for minimum film thickness.
a. Surface Preparation. Minimum surface preparation standards for epoxy coatings, as stated in
b. Final Coats. The antifouling topcoat for shipbottoms shall be self-cleaning/polishing.
c. Approved Coatings from Proprietary Sources. Proprietary coatings are to be purchased on a
competitive basis. Coating selection shall be made based on factors that contribute to total application
cost and time available for application. Paint thickness requirements specified in Appendix B shall be
used for estimating total cost. The factors to be considered are:
(1) Total coating material cost (that is, cost per square foot for required total film thickness, rather than
cost per gallon).
(2) Equipment available for coating application, and ease of application.
(3) Ambient temperature, pot life, stand-in or induction time, drying time required between coats, and
curing time.
(4) Safety precautions required.
(5) Colors of coating system as an aid to application and inspection of the surface during application
and in service.
(6) Availability of technical services.
(7) Past performance of coating.
(8) Whether or not the coating is approved for use by the Environmental Protection Agency (EPA).
(9) Procurement activities should solicit invitations for bid and comply with Defense Federal
Acquisition Regulations (DFARs) on each requisition for proprietary coatings.
d. Aluminum Boats Shipbottom Paint System:
|
||
|
||
