14.1 GENERAL
The corrosion control system (coating and cathodic protection) of the exterior hull surfaces, interior spaces and tanks shall be defined for at least 60 months protection, without dry-docking.
All steel structures, spaces, housing, equipment, piping and other steel and all inside and outside areas shall be painted in accordance with the requirements as specified in this section.
14.2 PAINT SYSTEM
14.2.1 General
It shall be Yard's responsibility to apply an adequate paint system for a Barge suitable for world-wide operation.
Methods and conditions of application shall be strictly in compliance with the paint Manufacturer's instructions. Yard's proposal shall be submitted for approval to the Owner, prior to ordering.
The paint system for the hull shall be at least equivalent to the following: 14.2.2 Surface preparation
Unless indicated otherwise, all fabrication and assembly shall be complete before starting surface preparation.
All surfaces to be coated shall be properly prepared according to the paint manufacturer's specifications prior to application of any paint. Surface preparation and coating shall be scheduled by Yard to best practice and to avoid (a) damage to surrounding areas/systems (b) reworking of areas.
Shop primer shall be removed completely by means of blasting till ISO 8501-1, SA 2½, unless it is proven to be compatible with the final system, in which case it shall be sweep blasted to at least SPSS-Ss.
Rusty and bare surfaces shall be blasted to ISO SA 2½.
14.2.3 Under water part (Bottom and side shell up to 5 meter waterline) • 1 coat 50 µ DFT Epoxy Primer
• 2 coats 150 µ DFT each Free Epoxy
14.2.4 Side shell above water (from 5 meter waterline) and rocker arm • 1 coat 50 µ DFT Epoxy Primer
• 2 coats 150 µ DFT Tar Free Epoxy 14.2.5 Decks; exposed and interior
• 2 coats 150 µ each Epoxy Mastic • 1 coat 50 µ Epoxy Topcoat
14.2.6 Walls and underside decks; pump rooms, engine room and pipe tunnel segments • 1 coat 80 µ DFT Sealer • 1 coat 50 µ DFT undercoat • 1 coat 50 µ DFT Enamel 14.2.7 Tanks • Stripe coat
• 2 coats 200 µ DFT each Epoxy Mastic of light color.
14.2.8 Ballast Tanks • Stripe Coat
• 2 coats solvent/chemical resistant Epoxy Mastic of light color 200 µ DFT
14.2.9 Void spaces
• 1 coat of Tar Free Epoxy 200 µ DFT
14.2.10 Office, control room and switchboard room
Unexposed steel surface behind paneling or insulation: • 1 coat primer 80 µ DFT
Floors:
• 1 coat primer 80 µ DFT
• 2 layers marine deck paint 80 µ - non skid type for last coat 14.2.11 Outfitting
Deck outfitting (masts, skid beams, bollard, brackets, etc) • 2 coats 150 µ each Epoxy Mastic
• 1 coat 50 µ Polyurethane Topcoat as proposed hull topside Ventilators (inside)
Ventilation ducts (inside), galvanized • No paint
In general all outfitting such as doors, ladders, handrails etc. shall be painted as specified for the space in which they are located.
14.2.12 Miscellaneous steel
In general all piping shall be treated with approved anti-corrosive coatings.
All ballast piping, tank over-flow pipes, drain pipes, fresh and salt water pipes, air or gas lines, etc. shall be galvanized steel or approved corrosive resistant material such as PVC or copper-nickel.
All bolts and nuts and other fasteners shall be cadmium plated, galvanized, or coated with an approved anti-corrosive coating.
All steel wire ropes shall be drawn galvanized. This includes all wire ropes for hoists, tow lines, etc. All wire ropes shall have certificates.
All light fittings for external use shall be made of aluminum or of galvanized steel.
14.3 INSPECTION AND TESTING
All surfaces shall be inspected by the Yard's inspector prior to inspection by the Owner's representative. Safe and adequate staging and lighting shall be provided for inspection. Yard shall supply an inspection program.
The Owner shall be represented by an inspector to ensure that the specifications for the job are complied with.
All aspects of the work shall be accessible to the Owner's inspector.
The inspector shall have the authority to inspect any materials, tools or equipment used in the coating procedures and surface preparation operations. He shall have the right to condemn any and all material, work or equipment, which does not comply with this specification.
The test shall comprise the following: • Performance test
• Film thickness • Adherence test
14.4 GALVANIZING
All equipment in connection with wood, canvas, fiber, ropes, etc. and as described in the different sections in this specification shall be heavily galvanized,
• Lashing equipment for life rafts, foundations etc. • Outside railings
• Protection rails
• Fittings for ladders and walkways • Ventilation grids
• Raised floor plates
Furthermore, protection covers including hangers, hinges, holders for cables, ventilation ducts, pipes and similar outfit and equipment shall also be heavily galvanized, including hangers for portable fire extinguishers.
14.5 INTERNAL CATHODIC PROTECTION
In addition to the specified paint system, all seawater tanks, and seawater inlet chests shall be protected by means of a suitable number of sacrificial anodes. Zinc and/or aluminum anodes shall be fitted, suitable in number and configuration for an average of 20 mA/m², giving at least 5 years protection against galvanic corrosion based on 8% bare steel.
Location, size and number of anodes shall be in harmony with the paint system, according to manufacturers' recommendations and to Owner's approval.
Double plates shall be mounted (continuously welded) to the plating behind the anodes.
The anodes shall be fastened to the double plate in an approved manner, to allow easy replacement, to Owner's satisfaction.
14.6 EXTERNAL CATHODIC PROTECTION
Yard to specify and supply sufficient sacrificial anodes for protection of hull.
Zinc and/or aluminum anodes shall be fitted, suitable in number and configuration for an average of 20 mA/m², giving at least 5 years protection against galvanic corrosion based on 8% bare steel.
Location, size and number of anodes shall be in harmony with the paint system, according to manufacturers' recommendations and to Owner's approval.
Double plates shall be mounted (continuously welded) to the plating behind the anodes.