Background
Modern hull protection combines two complementary defences: protective coatings that physically separate steel from corrosive environments, and cathodic protection systems that electrochemically suppress corrosion of any steel exposed where coatings are damaged or absent. Together these systems extend hull life, maintain hydrodynamic efficiency through smooth fouling-free surfaces, protect ballast tanks and cargo tanks from accelerated corrosion, and reduce the dry-docking and steel renewal costs that would otherwise burden ship operations. The IMO Performance Standard for Protective Coatings (PSPC, Resolution MSC.215(82)) establishes mandatory minimum requirements for ballast tank coatings on new ships, and the Anti-Fouling Systems Convention (AFS Convention) regulates antifouling coatings to prevent environmental harm from biocidal compounds. The class society survey regime, with its dry-docking intervals and detailed steel inspection requirements, monitors corrosion progress and validates that protective measures are functioning effectively.
Marine Corrosion Mechanisms
Understanding corrosion mechanisms is essential to designing effective protection systems. Several distinct corrosion processes affect ships, each with characteristic appearance, location, and control measures.
General corrosion (uniform corrosion) occurs across exposed surfaces in contact with seawater or salt-laden atmosphere, producing relatively uniform metal loss across the affected area. Underwater hull steel exposed to seawater corrodes at approximately 0.1 to 0.2 millimetres per year if unprotected, with rates depending on water temperature, dissolved oxygen, salinity, and biological activity. General corrosion is the most predictable corrosion type and is the primary target of protective coatings and cathodic protection.
Pitting corrosion is localised attack producing small deep cavities in otherwise sound metal. Pitting initiates at coating defects, weld imperfections, or surface contamination, and proceeds rapidly because the small anodic area at the pit bottom is supported by the much larger surrounding cathodic area. Pitting depths can reach several millimetres while surrounding metal loss is negligible, making pitting particularly damaging to plate strength and pressure boundaries. Stainless steels and aluminium alloys are particularly susceptible to chloride pitting in seawater.
Crevice corrosion occurs in narrow spaces (under gaskets, in lap joints, between bolt heads and surfaces) where stagnant electrolyte develops differential aeration cells, with the oxygen-depleted crevice becoming anodic and corroding while the oxygen-rich exterior surface acts as cathode. Crevice corrosion is common at flanges, seals, and structural lap joints.
Galvanic corrosion occurs when dissimilar metals are electrically connected in an electrolyte, with the more active metal (anode) corroding preferentially while the less active metal (cathode) is protected. Galvanic corrosion drives the basic mechanism of cathodic protection but also causes problems where unintended dissimilar-metal couples occur, particularly between bronze propellers and steel hulls, between stainless steel piping and carbon steel, and between aluminium superstructures and steel decks.
Stress corrosion cracking (SCC) combines tensile stress and corrosive environment to cause brittle cracking in normally ductile materials. SCC is particularly relevant to high-strength steel structural members, austenitic stainless steel piping carrying chloride solutions, and high-strength aluminium alloys.
Microbiologically influenced corrosion (MIC) is accelerated corrosion caused by microorganisms (sulphate-reducing bacteria, iron bacteria, fungi) producing aggressive metabolites and creating differential aeration cells. MIC is significant in stagnant ballast water, fuel oil tanks (interface between water bottoms and fuel), and engine cooling water systems.
Erosion-corrosion combines mechanical erosion from flow turbulence with chemical corrosion, accelerating metal loss in regions of high velocity, particle impact, or cavitation. Erosion-corrosion affects propeller surfaces, sea water cooling pipework at fittings and bends, and pump impellers.
Cathodic Protection Theory
Cathodic protection (CP) suppresses corrosion by making the protected metal cathodic in an electrochemical cell, with all corrosion forced onto deliberately introduced anodes that can be replaced periodically. The fundamental principle relies on the electrochemical fact that corrosion is an electrical process: corroding metal loses electrons (oxidation, anode behaviour) while reducing species gain electrons (reduction, cathode behaviour). By forcing the protected steel to be entirely cathodic (electron source rather than electron loser), corrosion is suppressed.
The galvanic series (also called the practical galvanic series or seawater galvanic series) ranks metals by their relative tendency to corrode in seawater. Magnesium is most active (most corrosive), followed by zinc, aluminium alloys, mild steel, cast iron, lead, brass, bronze, copper, stainless steels, titanium, and ultimately the noble metals (silver, gold, platinum). When two metals from this series are connected in seawater, the more active metal corrodes and the less active metal is protected.
Sacrificial anode protection uses metals more active than steel (typically zinc, aluminium alloys, or magnesium) electrically connected to the steel structure. The active metal corrodes while protecting the steel, with anode life inversely proportional to its mass and operating current. When anodes are consumed (typically over 2 to 5 years), they must be replaced.
Impressed current cathodic protection (ICCP) uses an external direct current power supply to drive protective current through inert (or near-inert) anodes mounted on the hull. The power supply forces the protective current independently of natural electrochemical driving forces, allowing higher current output, more uniform protection, and longer-lasting anodes than sacrificial systems. ICCP requires electrical infrastructure (rectifier, control system, wiring) but offers operational advantages on larger ships.
Protection criterion is the metric used to determine adequate cathodic protection. The standard criterion for steel in seawater is a potential of -0.85 volts or more negative as measured against a silver-silver chloride seawater reference electrode (Ag/AgCl/seawater). At this potential or more negative, corrosion of carbon steel is suppressed below practically significant rates. Excessive negative potential (below -1.10 volts) causes hydrogen evolution that can damage some coatings and embrittle high-strength steels.
Current density requirements depend on coating quality, operational profile, and water chemistry. Bare steel in seawater typically requires 100 to 200 milliamperes per square metre for protection. Well-coated steel requires only 5 to 20 milliamperes per square metre, since the coating reduces the exposed area requiring protection. Throughout a ship’s coating service life the current density requirement increases as coating deteriorates, requiring CP system designs that accommodate this progression.
Sacrificial Anode Systems
Sacrificial anode cathodic protection is the most common protection system for ship hulls, ballast tanks, cargo tanks, sea chests, and other steel structures exposed to seawater.
Zinc anodes are the most common sacrificial anode material, with operating potential of about -1.05 volts (Ag/AgCl) and theoretical capacity of approximately 780 ampere-hours per kilogram. Zinc anodes are reliable, cost-effective, and have moderate consumption rates suitable for most ship applications. The MIL-A-18001K specification (US military, widely adopted internationally) covers zinc anode composition, with high-purity zinc plus aluminium and cadmium activators ensuring continued anode dissolution rather than passivation.
Aluminium anode alloys provide higher capacity (approximately 2700 ampere-hours per kilogram) than zinc, allowing smaller anode mass for equivalent protection life. Aluminium anodes are increasingly common on ship hulls and ballast tanks as their cost has decreased and their reliability has been demonstrated in extensive service. The aluminium-zinc-indium (Al-Zn-In) alloy is the most common composition, with indium acting as an activator preventing the protective oxide film that would otherwise passivate pure aluminium.
Magnesium anodes have very high capacity and most negative driving potential, but are typically used only in low-conductivity environments (fresh water, brackish water) where their high driving voltage overcomes the higher resistance. Magnesium anodes are uncommon on ocean-going ships but are used on some inland and coastal vessels.
Anode design and shape varies with application. Hull anodes for ship exteriors are typically flush-mounted in welded steel inserts, with the anode surface flush or slightly proud of the hull plating to minimise hydrodynamic drag. Ballast tank anodes are typically standoff anodes welded to brackets on tank framing or shell plating, with the anode standing off the surface to allow protective current to flow uniformly into the surrounding electrolyte.
Anode placement is determined by the current distribution requirements of the protected structure. The principles include: anodes should be distributed to provide reasonably uniform current to the structure, with attention to coating quality variation across the structure. Anodes should be positioned to minimise the throw distance to the most distant protected steel. Anodes should be accessible for inspection and replacement during dry-docking. Anodes should be electrically isolated from each other (mounted in welded inserts or brackets that ensure single connection point through the structure).
Anode mass design follows the relationship between current required, current capacity, and design life: mass equals current multiplied by hours divided by capacity. For example, an anode providing 1 ampere for 5 years (43800 hours) requires approximately 56 kilograms of zinc anode (43800 ÷ 780 = 56). Total anode mass on a 200 metre ship hull might be 5 to 10 tonnes for hull protection plus several additional tonnes for ballast tank protection.
Survey requirements include verification of anode condition and consumption at each dry-docking. Anodes consumed below 25 percent of original mass are typically replaced regardless of remaining life calculations, providing margin for unanticipated conditions. Anode performance trending across multiple dry-docking cycles helps refine design assumptions and identify changes in coating condition affecting current draw.
Impressed Current Cathodic Protection
Impressed current cathodic protection (ICCP) systems use external DC power to drive protective current through inert anodes, providing controllable corrosion protection with extended anode life.
ICCP power supply consists of a transformer-rectifier (TR) unit converting ship’s AC electrical power to controlled DC voltage. The TR is sized for the maximum required output current at sufficient driving voltage to overcome the seawater resistance and the electrochemical polarisation of the system. Modern marine TRs incorporate microprocessor control, automatic potential regulation, fault monitoring, and remote indication systems.
ICCP anodes are typically mixed-metal oxide (MMO) on titanium substrates, lead-silver alloys, or platinised titanium. These materials are nearly inert in seawater (consumption rates of milligrams per ampere-year, compared to kilograms per ampere-year for sacrificial anodes), allowing very long anode service life (often 20+ years).
ICCP reference electrodes monitor the protected structure potential and provide feedback to the TR control system, which adjusts output current to maintain the protected potential at the design setpoint. Silver-silver chloride seawater reference electrodes are standard, with multiple reference electrodes distributed across the structure to verify uniform protection.
Hull ICCP installations typically include 4 to 8 anodes distributed along the hull (typically at the stern quarters, amidships, and bow areas), with 2 to 4 reference electrodes providing monitoring. Total ICCP output for a large ship might be 200 to 800 amperes, providing protection for the entire underwater hull surface.
ICCP shaft grounding provides electrical connection between the rotating propeller shaft and the hull structure, ensuring the protective current can reach the propeller through the shaft. Without effective shaft grounding, the propeller and shaft may be partially or fully isolated from the CP system, allowing localised corrosion and electrolytic damage.
Stray current protection considerations are important on ICCP-equipped ships, as the protective current can affect adjacent structures. Insulating coatings, careful anode placement, and operational procedures (reduced ICCP output during berthed conditions) limit stray current effects on shore facilities, neighbouring vessels, and submarine cables.
ICCP advantages over sacrificial anode systems include controllable output (can be increased or decreased to match requirements), longer anode life (no need for routine anode replacement), lower hydrodynamic drag (fewer hull-mounted anodes), and continuous monitoring capability through reference electrodes. ICCP disadvantages include capital cost (higher than sacrificial systems), electrical infrastructure requirements (rectifier, monitoring systems, wiring), failure consequences (loss of all protection if electrical system fails), and operational complexity.
Hull Coating Systems
Hull coating systems are the primary line of defence against corrosion and biofouling on ship hulls. Modern coating systems use multiple layered coats to provide corrosion barrier, mechanical protection, and antifouling properties.
Surface preparation is the foundation of effective coating performance. New steel surfaces typically require abrasive blasting to ISO 8501 Sa 2.5 (near-white blast cleaning) or Sa 3 (white metal blast cleaning) to provide a clean, profiled surface for coating adhesion. Abrasive blasting removes mill scale, rust, and contamination while creating a surface profile (roughness, typically 50 to 100 microns) that mechanically anchors the primer coat. Soluble salt levels (chloride contamination) on prepared surfaces must be below specified limits, typically 30 to 50 micrograms per square centimetre, to prevent osmotic blistering of subsequent coatings.
Anti-corrosive primer coats provide the principal corrosion barrier, with epoxy zinc-rich primers (containing 80 to 95 percent zinc dust) being the standard. Zinc-rich primers function by sacrificial cathodic protection at micro-scale: the zinc particles in the primer corrode preferentially, protecting the underlying steel. Primer dry film thickness is typically 50 to 75 microns, with single or two-coat application depending on system specification.
Anti-corrosive intermediate coats provide additional barrier protection and build film thickness. Modern marine coating systems use epoxy-based intermediate coats at dry film thicknesses of 100 to 200 microns, sometimes with multiple layers. The intermediate coats also provide tie-coat compatibility between the primer and the topcoat (antifouling) systems.
Antifouling topcoats prevent attachment and growth of marine organisms (barnacles, mussels, algae, hydroids, tube worms) that would otherwise foul the hull and dramatically increase hydrodynamic drag. Several antifouling technologies are used:
Self-polishing copolymer (SPC) antifoulings combine biocides bound to a copolymer matrix that hydrolyses slowly in seawater, releasing biocides and exposing fresh surface. SPC antifoulings provide controlled biocide release for 3 to 5 years between dry-dockings, with the polishing rate matched to expected service speed.
Hard antifouling coatings use insoluble biocide-containing matrices that release biocides through diffusion. Hard antifoulings are mechanically more durable than SPC but provide shorter effective service life.
Foul release coatings (silicone- or fluoropolymer-based) work by providing extremely low surface energy that prevents firm attachment of fouling organisms. Foul release coatings contain no biocides (relevant to environmental compliance) and offer very long service lives (10+ years) but require minimum service speeds (typically 12 to 14 knots) for self-cleaning effect, making them less suitable for vessels with extended slow-steaming operations.
Biocide types in antifouling coatings include cuprous oxide (the principal biocide in most modern antifoulings), zinc pyrithione (a co-biocide effective against algae), copper pyrithione, and various organic biocides. Tributyltin (TBT) compounds, formerly the dominant antifouling biocide, are now banned globally under the AFS Convention due to their devastating environmental effects on non-target species.
The Anti-Fouling Systems Convention (AFS Convention), adopted by IMO in 2001 and entered into force in 2008, prohibits TBT and certain other harmful antifouling biocides on ships, with phased implementation reaching full force in 2008. The convention requires ships to carry a certificate of antifouling system documentation showing compliance with prohibited substances.
IMO Performance Standard for Protective Coatings (PSPC)
The IMO Performance Standard for Protective Coatings (PSPC, Resolution MSC.215(82)) establishes mandatory minimum requirements for ballast tank protective coatings on new construction ships built from 2008 onward. The PSPC was developed in response to extensive ballast tank corrosion problems on aging bulk carriers and tankers, with major casualty implications including loss of structural integrity and ship loss.
PSPC application covers dedicated salt water ballast tanks on all ships of 500 GT or above, plus double-hull spaces of bulk carriers of 150 metres or more in length. The standard prescribes detailed surface preparation, coating selection, application, and inspection requirements designed to deliver coating service life of at least 15 years.
Surface preparation per PSPC requires abrasive blasting to Sa 2.5 minimum, with 30 to 75 micron surface profile, soluble salt content below 50 milligrams per square metre, and dust contamination below specified limits. Edge preparation (rounding of plate edges and weld toes) is required to ensure adequate coating coverage at these high-stress geometries.
Coating system selection requires light-coloured epoxy-based hard coatings approved as suitable for ballast tank service. Two-coat systems with total dry film thickness of 320 microns are standard, with each coat at 160 microns. The light colour facilitates visual inspection of coating condition and identification of defects.
Application requirements include controlled environmental conditions (temperature, humidity), specified application techniques (typically airless spray with stripe-coating of edges), and detailed application records. Stripe coating (pre-coating of edges and welds before main coats) ensures adequate coverage at these difficult-to-coat geometries.
Quality assurance includes coating inspector certification (typically NACE Coating Inspector level 2 or equivalent), comprehensive inspection during application, holiday testing (low-voltage detection of pinholes), dry film thickness measurement, and complete documentation of all activities.
PSPC compliance is verified through coating technical files maintained throughout the ship’s life, recording original coating specification, application details, and subsequent maintenance. Class society surveyors verify PSPC compliance during construction and review records during periodic surveys.
The PSPC has substantially improved ballast tank coating durability, with most PSPC-compliant ships expected to maintain “Good” coating condition through their first major dry-docking and “Fair” condition into the second dry-docking interval, dramatically reducing the steel renewal costs that previously burdened older ships.
Cargo Tank Coatings
Cargo tank coatings on tankers protect against cargo-induced corrosion and prevent contamination of cargoes. Different cargo types require different coating systems matched to their corrosivity and chemical compatibility.
Crude oil tank coatings traditionally used inorganic zinc silicate primers, providing protection against the mildly corrosive crude oil environment plus condensation during cargo discharge. Modern crude oil tankers increasingly use specialised epoxy systems offering better resistance to ballast water in dual-purpose tanks plus crude oil.
Product tanker tank coatings handle clean petroleum products (gasoline, diesel, kerosene, jet fuel) and require coating systems with specific chemical resistance to these products. Pure epoxy systems are common, with additional consideration for cargo cleanliness (avoiding contamination from coating materials).
Chemical tank coatings (on chemical carriers) handle the wide range of chemical products covered by the IBC Code, with coating selection based on the cargo chemical compatibility. Inorganic zinc silicate (ZS) coatings handle many cargoes including alcohols, glycols, and amines. Pure epoxy coatings handle different cargo lists, with neither coating system handling all possible cargoes. The cargo compatibility chart for each coating system determines which cargoes can be carried.
Stainless steel cargo tanks on chemical and food-grade tankers eliminate the need for coatings entirely, with the metal itself providing corrosion resistance and easy cleaning between cargoes. Stainless steel tanks are expensive but required for certain corrosive cargoes (sulphuric acid, phosphoric acid, certain food products).
Rubber and elastomeric linings provide chemical-resistant protection for tanks carrying highly corrosive cargoes (concentrated acids, certain industrial chemicals). Linings are applied as sheets bonded to the steel substrate or as sprayable coatings depending on the specific product and tank configuration.
Specialised Coatings
Beyond hull and tank coatings, ships use specialised coatings for various specific applications.
Deck coatings provide non-slip surfaces on weather decks, walkways, and stair treads. Aggregate-loaded epoxy or polyurethane coatings provide both slip resistance and corrosion protection.
Engine room coatings withstand the high temperatures, oil exposure, and frequent maintenance access of machinery spaces. Heat-resistant inorganic coatings handle very high temperatures (exhaust manifolds, boiler casings), while general engine room coatings prioritise oil resistance and easy cleaning.
Underwater hull patching coatings (for in-water hull repairs without dry-docking) are specialised products that cure underwater and provide temporary protection until next dry-docking. Underwater patching is increasingly common as a means to defer minor coating repairs.
Cargo hold coatings on bulk carriers protect against the abrasive and sometimes corrosive cargoes carried (coal, bauxite, sulphur, ammonium nitrate, grain). Modern bulk hold coatings include hard-wearing epoxy systems sometimes with additional surface treatments for specific cargo compatibility.
Internal coatings for piping (sea water cooling, fire main, ballast piping) include specialised cement-mortar linings, high-build epoxies, and bonded plastic linings depending on service. Internal pipe coatings can substantially extend pipe life in aggressive seawater service.
Survey Requirements and Inspections
Class society surveys monitor coating condition and cathodic protection effectiveness throughout the ship’s service life, with inspection findings driving maintenance and renewal decisions.
Annual surveys include limited external hull examination (where accessible), CP system spot checks, and verification of coating maintenance records. Annual surveys do not typically include dry-docking unless required by specific findings.
Intermediate surveys (typically at 2.5 year intervals) include more comprehensive examination, with attention to coating condition deterioration, anode consumption, and structural integrity at corrosion-prone areas.
Special periodical surveys (5-year intervals, classified ESP for tankers and bulk carriers) include comprehensive structural and coating inspection, typically at dry-docking. Steel thickness measurements (gauging) at prescribed locations identify corrosion-induced steel loss requiring renewal. Visual inspection of all accessible spaces documents coating condition rating (Good/Fair/Poor per PSPC and class rules).
Dry-docking surveys at intervals of typically 30 to 60 months provide opportunity for comprehensive hull examination, coating renewal, and CP system maintenance. Underwater inspection in lieu of dry-docking (UWILD) is permitted on alternate dry-docking intervals for some ship types, reducing the frequency of actual dry-docking.
Coating condition assessment uses standardised criteria including coating breakdown percentage (area where the original coating has failed), rust scale percentage, pitting severity, and visual inspection of weld and edge areas. Condition ratings drive maintenance recommendations.
Maintenance and Renewal
Coating and CP maintenance combines routine attention during operation, in-service inspections, and major maintenance during dry-docking.
In-service hull cleaning (underwater hull cleaning by divers or remotely operated vehicles) removes biofouling that accumulates between dry-dockings, restoring hull smoothness and reducing fuel consumption. Cleaning frequency depends on operational profile, antifouling effectiveness, and water temperature, with cleaning every 3 to 6 months common on ships in tropical service.
Touch-up coating during operation addresses small areas of coating damage in accessible locations. Marine touch-up products allow coating repairs in less-than-ideal conditions (humid air, marginal surface preparation), providing temporary protection until full repair at next dry-docking.
Anode replacement during dry-docking removes consumed anodes and installs new ones, with attention to electrical connection quality and proper bracket alignment. Anode replacement is typically scheduled with each dry-docking, though some operators extend intervals where anode life calculations show continued capability.
ICCP system maintenance includes inspection of anode connections, reference electrode condition, rectifier component condition, and overall system performance. ICCP failures often involve electrical components (rectifier, control circuits) rather than the anodes themselves.
Coating renewal during dry-docking ranges from minor touch-up at coating breakdown areas to full coating renewal where extensive deterioration has occurred. Major coating works at 5-year or 10-year intervals are common on ships operating in demanding services. The cost of full hull recoat (surface preparation, coating application, ancillary repairs) can exceed several hundred thousand US dollars on a large ship, making coating selection and maintenance major financial decisions.
Steel renewal addresses areas where corrosion has reduced steel thickness below acceptable limits. Class rules specify minimum residual thickness (typically 70 to 80 percent of original thickness, varying by location and member type), with greater thickness loss requiring steel replacement. Steel renewal is the most expensive consequence of inadequate corrosion protection and the principal driver for investment in good coating and CP systems.
Future Developments
Hull protection continues to evolve in response to environmental regulations, energy efficiency drivers, and technological advances.
Biocide-free antifouling systems gain importance as environmental concerns over copper and other biocide impacts on marine ecosystems drive regulatory and voluntary restrictions. Foul release silicone coatings, ultrasonic antifouling, and emerging surface-engineering approaches (lubricant-impregnated surfaces, structured surfaces) all show promise as biocide alternatives.
Energy efficiency benefits of smooth hulls drive continued investment in coating quality and hull cleaning. Hull roughness (the average surface roughness of hull surfaces) contributes substantially to hydrodynamic resistance, with each 10 micrometre increase in roughness adding approximately 1 percent to fuel consumption. Modern hull cleaning, premium coating systems, and frequent maintenance can reduce hull roughness to levels approaching new-build conditions.
Smart coating systems with integrated sensors monitor coating condition, corrosion progression, and CP performance in real time. IoT sensors mounted on hulls and inside ballast tanks provide continuous data on temperature, humidity, electrochemical potential, and coating integrity, with cloud-based analytics platforms providing fleet-wide visibility.
Advanced cathodic protection technologies including remote monitoring, automatic optimisation, and predictive maintenance extend the capabilities of traditional ICCP systems. Some systems now include automatic adjustment to operational profile (port versus sea passage, loaded versus ballast).
Alternative materials for hull components (high-performance stainless steels, duplex stainless steels, titanium, fibre-reinforced composites) reduce or eliminate corrosion in specific applications. While full composite hulls remain rare on large commercial ships, components and panels in fibre-reinforced composites are increasingly common.
Conclusion
Marine cathodic protection and hull coatings together provide the integrated corrosion control that enables modern ships to operate for decades in the harsh marine environment. The combination of multi-coat protective coating systems for the bulk of corrosion protection, sacrificial anode and impressed current cathodic protection for backup at coating defects, regular survey and maintenance regimes, and the IMO PSPC and AFS Convention regulatory frameworks produces the reliable corrosion control that ship operators require. Crew members and ship managers responsible for these systems must understand the principles, technologies, regulatory requirements, and maintenance practices that together preserve hull integrity throughout the ship’s service life. As the maritime industry evolves through environmental regulation, energy efficiency requirements, and technological advances, hull protection systems are evolving with it, but the fundamental challenge, preserving steel ships from corrosion in the unforgiving marine environment, remains a constant aspect of ship operation.
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- Corrosion Sacrificial Anode Life Calculator
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Related Wiki Articles
- Hull Form Design
- Hull Strength and Longitudinal Bending
- SOLAS Chapter II-1: Construction, Subdivision and Stability
References
- IMO Resolution MSC.215(82) - Performance Standard for Protective Coatings for Dedicated Seawater Ballast Tanks
- IMO Anti-Fouling Systems (AFS) Convention 2001
- ISO 8501 - Preparation of steel substrates before application of paints and related products
- DNV Rules for Classification of Ships - Pt 4 Ch 10 Equipment
- NACE/AMPP standards for cathodic protection and coating performance