DRY DOCKING PROCESS The process of dry-doc dry-docking king refer referss to when a vessel is take taken n to the service yard and brought to dry land so that submerged portions of the hull can be cleaned and inspected. This work is both preventative as well as a reg regula ulator tory y req requir uireme ement nt wit within hin the ind indust ustry ry.. Wh When en sec second ond-ha -hand nd purchased vessels are due for dry-docking, they are rebranded and assessed to meet all international standards.
DRY DOCKING GRAVING DOCK
GR! GR!"#G $%&' (R%&)**+ (R %&)**+ graving dock is a narrow basin or vessel that can be flooded to allow a load to be floated in, then drained to allow that load to come to restt on a dry pla res platfo tform. rm. Gra Gravin ving g doc docks ks are use used d for the con constr struct uction ion,, maintenance, and repair of ships, boats, and other watercraft. •
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Arrival at Yard and Entering the Dry-dock
Pumping Down the Dock and Vessel “Taking” “Taking” the Blocks
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Ranging the Cables
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Hull Washing
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Hull Blasting
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Hull Painting
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Opening ea Chests and O!e"haul o# ea Val!es
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$ecessa"% Repai"s and &aintenance
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'looding the Dock
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Depa"tu"e and T"ials
DRY DOCKING SLIPWAY
The process of slipping a vessel is an inepensive and straightforward way to take a large vessel out of water for inspection or repair. "n tidal harbors and ports, it is normally necessary to wait for high tide. "n many cases, it is possible to take the vessel out of the water on one tide, and to make repairs and return it to the water on the net tide. The first step in use of a patent slip or marine railway system involves a cra c radl dle e be bein ing g lo lowe were red d to th thee bo bott ttom om of th thee in incl clin ined ed pl plan anee t the he slip/slipway0, at which point the vessel is moved into position directly above the cradle. The vessel is then be moored to the cradle with a number of ropes fore and aft to prevent the vessel from moving in any direction. 1arge marine railways can handle vessels of 2,333 tons. %nce the vessel is secured to the cradle, the process of hoisting the cradle out of the water and up the slipway begins. &are is taken when the cradle starts to bear the weight of the vessel+ if the vessel is not sitting correctly in the cradle, it may damage the cradle or fall from it when fully out of
the water. The vessel will usually sit on large wooden wedges when the lift out of the water begins+ in the case of larger vessels, they may be temporarily welded to the cradle by divers. When slipway engineers and staff are satisfied that the vessel is correctly cradled, it is hoisted to the top of the slipway, normally beyond the high tide mark. %riginally, men or ho hors rses es an and d bl bloc ock k an and d ta tack ckle le we were re us used ed to pr prov ovid idee me mech chan anic ical al advantage to drag the cradle and vessel up the slipway. With the advent of the steam engine, most marine railways were converted to steam powered operation. 4or remaining railways in eistence, electric or electro-hydraulic winches are the norm.
DRY DOCKING SYNCROLIFT
syncrolift or synchrolift is a system for lifting boats and ships outt of th ou thee wa watter fo forr mai aint nten enaanc ncee wor ork k or re repa paiir. The ve vess ssel el is maneuvered over a submerged cradle, which is then lifted by a set of synchroni5ed hoists or winches. The vessel can be worked upon in place, or it can be moved inland so the syncrolift can be freed f reed for other use. The largest syncrolifts can lift vessels up to 633,333 tons. 7ecause of this th is ca capa paci city ty,, sy sync ncro roli lift ftss ha have ve al almo most st co comp mple lete tely ly su supp ppla lant nted ed th thee older dry dock systems, most of which could handle only one vessel at a
time. The ship is transfer transferred red onto a platform platform placed placed on the bed of the ecavation, and both ship and platform are heaved up on to land by winches installed on either side of the platform. The syncrolift has been installed in "shii *hipbuilding &o., 1td. The winches winches are designed designed such that they can heave up the platform at a constant rate according to the weight distribution of the ship. fter being heaved up to the land level, a ship is shifted transversely or longitudinally on trolleys+ therefore, if there is a large area, many ships can be simultaneously inspected and repaired.
DRY DOCKING FLOATING DOCK
4loating $ock is a kind of a pontoon with sponsons on both the sides. The pontoon is divided into number of tanks. When the ship has to be docked, the tanks are filled with water due to which the dock submerges into the water. The The ship is then navigated into the dock and the tanks are emptied so that the dock rises above the water. The pumping of water is done with the help of ballast pumps which are located in sponsons. The sponsons are also equipped with cranes and bollards. 7oth the sponsons are connected with a bridge. part from the ballast pumps, the water is also filled manually with the help of manual valves.
To prevent any movement of the ship, keel blocks are provided. These keel blocks are placed on the tanktops. 4or increased stability side blocks are also also provided. The side blocks are provided provided in such a way way that the forces they eert don8t damage the hull. *pecial reinforcement material is provided to prevent this.
DRY DOCKING DOCKIN G TRAVELIFT TRAVELIFT
Travel lifts, also known as mobile boat haulers, are the ideal choice for lifting boats from 69 tons to in some cases up to 6633 tons. Thei Theirr vers versat atil ilit ity y in the the abil abilit ity y to lift lift yach yachts ts with with a vari variet ety y of dockin docking g plans plans requir requires es little little involv involveme ement nt from from divers divers to check check
slings before lifting, although it is still important for divers to check interference of the yachts running gear and stabili5ers before lifting with a travel lift. The travel lift works by lifting two or more slings connected to cables running to the top of a large frame structure ,perched on top of four wheels.
