17/06/2020
The rich activity of the underwater (uw) ship repairs company PT. MAJA MARINE SERVICES INDONESIA, is a glowing unique example of a speedy and healthy development in the maritime sector. Our Company has experienced and well trained diving staff in underwater repair and underwater maintenance of ship hulls. Moreover, we provide a whole range of wet services that ships require.
Cost of implementation
The price of hull cleaning will depend on the selection between a diver and a ROV, in addition to the vessel size. Total cost will be in the range of $5,000 to $35,000 (USD).
Reduction potential
Depending on the degree of marine fouling, vessel size, vessel segment, operation profile and trading areas a reduction in the range of 1% to 5 % on main engine fuel consumption can be expected.
OBJECTIVES
The main objective of PT. MAJA MARINE SERVICES INDONESIA, is the continuous enhancement and development of money saving choices that it ensures its customers.
Hull cleaning is applicable for all vessel types and ages. Depending on the degree and type of fouling to be removed a diver can typically clean 200 to 400 m2 per hour of flat surfaces (less on the bow and stern areas). The operation will be performed during normal ship stops (bunkering, anchorage, waiting for canal passage, etc.). The fuel reductions depend on the extent to which the hull is fouled.
Towards this direction, the most effective solution in saving money is the underwater hull cleaning. “Clean ship’s Hull means, reduction of fuel consumption, reduction of CO2 emissions, increase of ships speed.” “Fouled ship hulls increase the overall cost, causing increased fuel consumption and the emission of gaseous pollutants. The engines are strained as well as the propulsion system, the ship slows down.
We provide high quality underwater hull cleaning services (uw hull cleaning) ensuring the customer a prolonged period away from ship’s drydock, saving time and money.”
The purpose of underwater hull cleaning is to remove biological roughness or fouling. A build-up of marine fouling can lead to increased drag, resulting in a detrimental impact on a vessel’s hydrodynamic performance and hence the relationship between speed, power performance and fuel consumption. Fouling, particularly in the case of a prolific build-up of hard or shell fouling like barnacles or tubeworm, can cause turbulence, cavitation and noise, frequently affecting the performance of sonars, speed logs and other hull mounted sensors.
Proper cleaning removes all traces of fouling and does not remove or damage the coating or cause any increased surface roughness. Underwater cleaning is performed either by a diver with brushers or by a remotely operated vehicle (ROV) controlled from land.
One of the biggest problems facing the world shipping is fouled ships hulls. 1746 different species of marine organisms have been counted up, which are attached to submerged surfaces. Like shellfish, seaweed, sea moss and hydroids, which clog the underwater intakes, covering antifouling paint and creating a thick layer on the ship’s hull which in time destroys and affects its “good” function. Shellfish such as oysters and mussels, release millions of young bivalves in the water, which move with the help of the ocean currents. The young bivalves to enable to feed themselves adhere to static objects, which attract various species of algae. Ships that are anchored are ideal for the growth of these microorganisms. Typically, these are reduced when the ship is at sail, except for some that are very durable, such as the Brown W**d, which remain on the hull even when the ship is developing rapidly.
Another very resistant species are algae that secrete a sticky fluid which is highly corrosive, deriving from billions of algae monocytes, which produce syrupy nutritional means, which creates colonies, once installed they reproduce. Thus, a coating of the sticky liquid is created, as a thick layer which remains on the hull as the ship moves.
OUR ADVANTAGE
PT. MAJA MARINE SERVICES INDONESIA undertakes underwater cleaning of all underwater surfaces of the ship:
Underwater cleaning of sides
Underwater cleaning of flat
Underwater cleaning of curves
Underwater cleaning of the rudder
Underwater cleaning of the propeller
Underwater cleaning of the sea-gratings
Underwater cleaning of the sea chests
THE OUTCOME OF HULL CORROSION
The outcome of fouled hulls is the increase of abrasion resistance of the ship. The increased abrasion leads to speed reduction. Coating with 1mm thickness increases the abrasion by 80% thereby reducing the speed by 15% (Townsin 1987; Lui et al, 1977). So in order to maintain the same speed greater fuel consumption is required, thereby increasing the cost and the emission of gaseous pollutants. Depending on the type of vessel, fuel can make up about 50% of the operating cost of a ship. It is estimated that the fuel consumption increases 6% for each 100mm increase of speed. The increase in weight of the hull from the fouling has the effect of reducing the hydrodynamic behavior of the vessel, since it lowers the center of gravity of the vessel, therefore affecting its maneuverability.PT. MAJA MARINE SERVICES INDONESIA,provides high quality underwater hull cleaning with u/w Brush Kart System ensuring vessel operators that they employ a safe and cost-effective strategy. Our Brush kart system has reached perfection since it is manufactured in our work shop from 1992. All our service stations are furbished with new Brush Kart System on a yearly basis; especially manufactured, hydraulic power is differentiated according to sea water conditions and brushes are fabricated based specifically on fouling type, thickness and hardness of barnacles in each area. Prior to the underwater hull cleaning, inspection is carried out in order to determine the fouling condition as well as the type of fouling and based on the findings specialized brushes are fitted on the Brush Kart System.
UNDERWATER HULL CLEANING
Underwater hull cleaning is a proven cost saving tool for vessel operators. Fouled ship hulls increase the overall cost, causing increased fuel consumption and the emission of gaseous pollutants. The engines are strained as well as the propulsion system, the ship slows down.
ADVANCED SERVICES
The Brush Kart System consists of a steering wheel and a speed control valve which is adjusted by the diver. All our divers have undergone many hours on the job training on our own vessels and when they master the usage of the Brush Kart System they are sent to customers’ vessels. All our underwater hull cleaning systems are constructed by strict specifications so no damage will occur to hull coatings.
HYDRAULIC HULL CLEANING SYSTEM
The hydraulic hull cleaning Brush Kart System comprises of 3 units of brushes that retract fully from the hull with a clearance to prevent damage on the paint work coating while removing unwanted fouling and corrosion efficiently.
The fouled hulls and propellers strain the engines and can lead to engine problems, since the hydrostatic shape of the hull and propeller changes, the vibration is increased. The underwater hull cleaning (uw hull cleaning) ensures increased speed, reduction of fuel consumption and reduction of gaseous pollutants. Our company PT. MAJA MARINE SERVICES INDONESIA provides services in underwater hull cleaning using specialized last technology equipment.
The hull cleaning machine Brush Kart PT. MAJA MARINE SERVICES INDONESIA comprises of three units of brushes that retract fully from the hull with a clearance to prevent damage on the paint coating. The brushes used for the underwater hull cleaning (uw hull cleaning) are from wire, INOX or nylon. The nylon brushes are appropriate for the protection of the hull paint for soft fouling but are not used in the cases that the hull has shellfish. The machinery for underwater hull cleaning (uw hull cleaning) Brush Kart PT. MAJA MARINE SERVICES INDONESIA,ensure high productivity, speed and low cost. The underwater propeller cleaning is done with special brushes and then polished with special disc pads.
