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Roller Track Gravity Davit : GRT Series
 
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  November 20th, 2008
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RRB 425 Rescue Boat

The world's most competitive SOLAS approved rescue boat, type RRB 425.
CAR 35 Release Hook
The CAR 35 hook is the world's only IMO/SOLAS and Transport Canada approved combined automatic release hook
         

Davit arms
The davit system consists of two davit arms of a box-welded construction, each supported by a track-way.
The davit arms are provided with all relevant accessories such as roller-shafts, wire rope sheaves, climbing irons for easy access of top sheaves and necessary provisions for fastening of span-wire, bowsing-tricing system, lashing wires and maintenance slings.

Track-ways
The davit system consists of two track-ways, each supporting a davit arm. The track-ways are built-up from profiles and steel plates to a stiff rigid frame in order to transfer the forces to the ship’s structure.
The track-ways are provided with all necessary wire rope sheaves, bollards, provisions for fastening of relevant accessories, provisions for harbour pins and locking device for securing of boat and davit arm in stowed position.
Normally the track-ways are to be welded onto the deck but upon request they can also be delivered with a flange (optional)

Winch
Each davit system will be supplied with an electric driven winch. Dependent on the deck situation this winch can be a built-on type or a deck mounted type.
The winch is a standard item and consists of the following main components;
 Closed gear casing with base frame;
 Built-on electric motor;
 Winch drum, divided in two sections;
 Remote control drum;
 Speed reducer gear;
 Centrifugal brake unit for gravity lowering;
 Stop brake of the “dead-man” type;
 Manual cranking gear with safety device;
 Hand wheel for paying-out of wire rope.

Accessories:
Each davit system will be supplied with the following accessories:

Electric controls
 Motor starter for mounting near the railing and provided with main switch, push button and “power on” indicator;
 Limit switches

Suspension parts
 Galvanised steel wire rope(s) of sufficient length for lowering the boat into the water;
 Wire rope clamps, to be fitted onto the standing part of the wire rope. These wire rope clamps guarantee that the lifeboat always remains horizontal and that the davit arms run out simultaneously;
 Galvanised non-toppling lower blocks and plate links;
 All necessary chains, links and shackles.

Lashing parts
 Lashing wires, supplied with overlength (correct length to be determined by yard);
 One-man release gear;
 Loose items such as slip hook, turnbuckles, thimbles, wire rope clamps, links and shackles.

 

Bowsing-Tricing system
Each davit system will be supplied with a suitable bowsing-tricing system. This bowsing-tricing system guarantees that the lifeboat will automatically reach its correct embarkation level as soon as the davit arms have reached their full outboard position.
Dependent on the size of the lifeboat, this bowsing-tricing system can be either a conventional system consisting of a bowsing tackle and a tricing pendant or a so-called “belt bowsing” system which is in fact a combination of a bowsing tackle and a tricing pendant.

Remote control parts
 Stainless steel remote control wire of sufficient length;
 Pull cord for operating from within the lifeboat;
 Remote control sheaves and blocks;
 Loose items such as wire rope clamps and shackles;

Foul weather and recovery pendants (rescue boat only!)
 In case the lifeboat is also rated as a rescue boat, the davit will be supplied with foul weather and recovery pendants.

Remainder loose items
 Boat supports;
 Keel stops;
 Harbour pins (1 set per ship).

Conservation
Unless agreed otherwise, all steelwork will be shot blasted to SA 2,5 and coated with one layer of 2-component epoxy primer of brand SIGMA. Dry film thickness 60-80 microns.
This conservation is not suitable for outdoor storage for a long period of time.

Optional accessories
The following accessories are to be seen as non-standard but can be supplied optionally:
 Maintenance slings;
 Span wire and man ropes.


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