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发表于 2008-4-14 16:22
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来自： 中国山东济南
Soft Coating---FYI
Is a coating that remains soft so that it wears off at
low mechanical impact or when touched;often based
on oils (vegetable or petroleum) or lanoin (sheep wool
grease). Application of soft coating does generally not
allow relaxation of the extent of periodical hull survey
requirement of ballast tanks.
Chemistry--Can be lanolin/wool grease-based, petroleum-based,
vegetable oil-based, organic/inorganic.
Method of protection--Can be a corrosion inhibitor (interacts with oxides
to prevent further oxidation) or a corrosion barriere( prevents oxygen from
reaching metal surface) or a combination of the two.
Thickness--Can vary from a thin film of 3 mils to a thick film of 80 mils. This
is an important feature to consider when inspecting a tank, since a thicker
product may be safety hazard and require spot removal in order to see
the steel surface underneath.
Opacity--Can be opaque or transparent. This feature will have an impact on the
inspection of the tank. The opaque products will require spot removal to see the steel surface
underneath, whereas the transparent products could allow the inspector to
see most of the steel surface.
Application mothd--Products can be applied either by spraing or floating (or both)
The float method requires more paint, but no staging,and may cause risk of
water pollution when applied.
Application of soft coatings does not allow relaxation of the requirement for
annual examination of salt water ballast tanks. |
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