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a guide to hull painting of ships pdf

a guide to hull painting of ships pdf插图

What is the best book on hull painting for ships?

“The Guide to Hull Painting Of Ships” by Marine Insight is an extremely helpful digital resource to assist in such situations. Written by the very experienced and knowledgeable chief engineer/superintendent, this eBook provides a thorough general overview of all important aspects of hull painting operations carried out in the dry dock.

Why ship hull paint is important?

In the age of slow steaming, when fuel efficiency, environmental regulations and bunker costs have direct effects on ship operations, it is important that ship’s hull paint system is such that it offers long term efficiency once the ship is out of dry dock.

Is there a knowledge gap in Hull painting?

Moreover, there is a huge knowledge gap among maritime professionals regarding the hull painting operation, which eventually serves as a benefit to the shore staff, who can easily get away with errors and inefficient jobs.

What are the effects of hull fouling on vessel speed?

Loss of vessel speed from fouling also has huge fuel efficiency and bunker fuel cost implications, which is directly proportional to the quality of hull paint and hull fouling control systems.

What is the most expensive thing to do when dry docking a ship?

Painting a ship’s hull is one of the most expensive and important activities when dry docking a ship. A series of aspects are required to be taken into consideration while efficiently planning and executing the paint operation.

Who is Raunek Kantharia?

Raunek Kantharia is a marine engineer turned maritime writer and professional blogger. After a brief stint at the sea, he founded Marine Insight in 2010. Apart from managing Marine Insight, he also writes for a number of maritime magazines and websites.

Who wrote the handy guide for hull painting?

Written by Mr. S.N. Batra, a senior chief engineer and retired superintendent, the handy guide cuts through the noise of unwanted information and provides to-the-point data on all important procedures carried out in the dry dock related to hull painting.

What is the most expensive thing to do during a dry dock repair?

Painting a ship’s hull is one of the most expensive activities carried out during a dry dock repair operation. Considerable amount of commitment and investment is required to ensure that the task is carried out in the most efficient manner.

Why is hull coating important?

In the age of slow steaming, when ships have to comply with a series of environmental regulations, efficient hull coating and maintenance is of utmost importance. Loss of vessel speed from fouling also has huge fuel efficiency and bunker fuel cost implications, which is directly proportional to the quality of hull paint and hull fouling control systems.

Is hull painting a complex task?

I have attended dry docks several times and know what it takes to carry out dry dock operations successfully and safely. Hull painting, though seems simple, is a complex task that requires several factors to be taken into consideration. If you a maritime professional, make sure you grab this practical and handly guide.

Who wrote the book Hull Paint?

Hull painting is an important task which every maritime professional should be aware of. This great ebook written by the very experienced and renowned Mr. S.N. Batra provides all important aspects one needs to know about hull paint systems. – Rishabh Joshi, Third Engineer, GMC.

What is TBT free?

TBT-free erodible/ablative anti-foulings, also known as controlleddepletion polymer antifoulings,5 are based on a seawater-solublebinder (e.g., rosin) combined withinsoluble polymers that controlthe dissolution of the solublebinder. In seawater, the biocidedissolves with the soluble binder,and the ingredients controllingdissolution are washed away.7Themain biocide is cuprous oxide,which often is combined with oneor more “boosting biocides” forbetter efficiency.

What is the antifouling part of an under water coating system?

The antifouling part of an under-water coating system consists oftwo or three layers of paint contain-ing toxic materials (biocides) to pre-vent fouling of the hull by grass(seaweed, algae) and shells (bar-nacles, tubeworms, polyzoans,mussels, etc.).

What is anticorrosive coating?

However, polyure-thane products are becoming lesspopular because of the toxicity ofthe isocyanates they contain. Most anticorrosive coatings arehigh-solids and sometimes high-build materials. Use of epoxy mas-tics is increasing. Apart from goodsurface tolerance, they generallyhave long maximum overcoat timesand good recoatability. Total DFT ofunderwater hull and boottop sys-tems ranges from 250-400 µm. Anticorrosive properties areobtained by barrier protection,which means that the water vapourtransmission of the system shouldbe very low.

What is the coating system for a ship?

Coating systems for the under-water parts of a ship should be cor-rosion-inhibiting, antifouling, abra-sion-resistant, smooth, and compat-ible with cathodic protection. To minimise bunker (fuel) costs,the underwater hull should remainsmooth during service. Conse-quently, a coating system should beapplied as evenly as possible, and itshould provide long-term protectionagainst corrosion and fouling.Increased hull friction due to foul-ing can result in up to 40% morefuel consumption compared to aclean hull and greater air pollutionbecause of the extra fuel burned tomaintain a ship’s speed.Systems for the underwaterhull/boottop areas consist of ananticorrosive paint and an antifoul-ing paint on top of it. Sometimes asealer or tie coat is applied betweenthese two paints, especially whentar-containing anticorrosives areused. The sealer prevents the tarfrom bleeding into the antifouling,thereby improving its effectivenessand adhesion.

What is the purpose of a prefabri-cation?

The main function of a prefabri-cation, preconstruction, or shopprimer is to protect steel againstcorrosion and pollution duringthe building stage. It usually func-tions as a base for the final coat-ing system. However, it some-times is removed by blasting first,such as when the steel has cor-roded during construction orwhen the shop primer is tooweathered to form a solid basefor the coating systems. In cargotanks for aggressive chemicals, ashop primer must be removed toensure full chemical resistance ofthe final coating system.

What is the corrosion resistance of stainless steel?

The so called stainless steels owe their corrosion resistance to a thin surface film of oxides, called a passivefilm. The oxide film is cathodic compared with the base metal, and when broken, the adjacent base metalexposed to sea water will act as a sacrificial anode. Pitting will occur, often at a high rate.

What is holiday detection?

Holiday detection, or spark testing, or continuity testing, is not commonly used on paint coatings but canbe essential for linings for chemicals, pipe coating, and other critical coating or lining applications. Theequipment must be calibrated strictly according to the manufacturer’s instructions and duly considering thecoating or lining type and thickness. Low voltage equipment only is relevant for paint coatings.

What should be specified in a propeller?

The following should be specified:—size, shape and area of the external hull—speed and probable trade or trading routes, including time in harbours—propeller(s)’ type, size, speed, materials and location(s)—propeller shaft material, and if grounded to the hull—rudder and rudder accessories—sea water intakes, sea chests, and any other hull accessories.

What are soft coats based on?

Soft and semi-hard coatings may be based on for examplepetroleum oils, vegetable oils or wool grease (lanolin).

How to measure WFT?

WFT is usually measured only by the coating applicator. Rollers and comb type of equipment are in use. Thedry film thickness DFT can be estimated from the WFT:DFT = WFT x volume % solids/100.

What coatings should be applied on dry surfaces?

Coatings, including shop-primers and intermediate coating layers, should be applied on dry, clean surfaces(i.e. blast cleaned, shop-primed, mechanically cleaned, washed and dried if necessary) and according to thecoating manufacturer’s recommendations stripe coating is recommended for edges and welds.Clean conditions: See [4.1] to [4.2].

How long does acidic pickling solution take to react?

An acidic pickling solution shall be applied uniformly to all surfaces to be treated. After application, thedetergent shall be left to act on the material surface for the reaction time specified by the manufacturer,which is usually 20–30 minutes. Then the surface shall be washed thoroughly with fresh water, until the pHvalue of the washing water corresponds to that of the fresh water.

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