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635m3 Trailing Suction Hopper Dredge



Listing ID:
4100

DESCRIPTION:Sale of 635m3 Trailing Suction Hopper Dredge
DATE LAUNCHED:1979
LENGTH:55.15m
BEAM:12m
DRAFT:3.20m (Empty); 4.10m (Loaded)
LOCATION:New Zealand
BROKER:John Kearns
PRICE:1.95m New Zealand Dollars

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General Description:

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Builder: Whangarei Engineering & Construction Co. Ltd. New Zealand
Year Launched: 1979
LOA: 55.15m
Beam Max: 12m
Draft: 3.20m (Empty) 4.10m (Loaded)
Depth: 4.60m
Dead Weight: 2071 t
Gross Tonnage: 1001 t
Net Tonnage: 412 t
Flag: New Zealand
Home Port: Wellington
Service Speed: 9.0 knots
Main Engines Capacity: 2 x 470 hp
Hopper Capacity: 635 m3
Maximum Dredging Depth: 12.5m
 
VESSEL DESCRIPTION
55m Trailing Suction Grab Hopper Dredger flat bottom displacement type mono hull with a stepped sheer aft, square flat stern and the accommodation aft. The vessel is propelled by twin diesel engines on conventional shafts and propellers and twin rudders and bow thruster.
 
CONSTRUCTION 
The vessel was built in New Zealand by Whangarei Engineering & Construction Co Ltd and was delivered on the 14th November 1979. 
Construction is of welded steel plate on transverse frames and longitudinal stringers.  There are four water tight bulkheads. 
 
LAYOUT
The vessel has two accommodation decks with the bridge above the accommodation and the engine room below the accommodation and the pump room forward below the focsle.
THE BRIDGE DECK has the conning station amidships with the dredging console to starboard with access P & S to each wing deck.  The navigation and communication area is aft.  Behind the bridge is the vent room and battery locker.
POOP DECK has access up and out onto the side decks to port and starboard. This deck also has the galley, mess area, ablutions block and converted crew cabin with 3 bunks. 
MAIN DECK has access up and down via the stair well. It has the Masters and Chief Mates cabins to starboard and Chief Engineer and Second Engineers cabins to port. Amidships is the ablutions block. Aft is the workshop to port and store to starboard and access to the steering flat and down to the engineroom. Below the focsle are the Bosuns locker, paint store, lamp room and access down to the Pump room.
The CO2 locker is located off the main deck
 
ENGINES, MACHINERY AND ENGINEERING
Propulsion is provided via two turbo charged Mirrlees Blackstone main engines driving through Mirrlees Blackstone Hydraulic marine reversing gear boxes with 2.5:1 reduction coupled to conventional shafts and fixed pitch four bladed bronze propellers. The vessel is steered by twin hydraulically operated rudders.
Main engines: (2)
Maker: Mirrlees Blackstone 
Model: ES6M6R
Output: 470 hp @ 750 rpm each
No of Cylinders: Six (6)
 
An electrically driven 200 hp tunnel bow thruster with a viable pitch propeller is fitted.
The engine room area and its associated equipment all appears to be in good tidy condition.
 
MAIN GENERATOR PLANTS:
The vessel is fitted with 2 main generator plants and are situated outboard forward on the lower level in the engine room.
The electrical control panel is also forward on the lower level in the engine room.
 
ENGINES:  2 x Mirrlees Blackstone E4MA Marine diesels, 225 hp @ 750 rpm each
GENERATORS:  2 X Brush BJS 672 type 193 kVA 400V 50Hz @ 100% load
 
ELECTRONIC AND ELECTRICAL
Primary ships AC electrical power is provided by the 2 x 193 kVA generators. Voltage is 225 AC. DC voltages are primarily 24volt with some 12volt services
Electrical circuits are monitored and controlled in the engine room and in the wheel house
Battery banks are provided for the Jet Water Pump engine, back up lighting and radio and electronic equipment.
 
TANKAGE
DIESEL OIL
There are 2 tanks for diesel fuel oil, including overflow tank. 
Total capacity is 62.14 m3 @ 100%.
FRESH WATER
There is one fresh water tank. Total capacity is 17.30 m3 @ 100%.
BALLAST TANK
There is one ballast water tank. Total capacity is 41.96 m3 @ 100%.
LUBE OIL
There is 1 tank for Lube oils. Total capacity is 2.33 m3 @ 100%.
 
There are 10 other tanks of varying capacity for sewage, sludge and Hydraulic oil.
 
STEERING GEAR
The rudder room is directly above the rudder posts.
The steering gear is a two hydraulic ram system. The hydraulics are electrically operated. There are two identical electro hydraulic pumps
and power units. 
A manual override system is also provided.
This area also has a direct telegraph link to the bridge.
The rudders are a semi balanced type.
 
DREDGING EQUIPMENT
The hopper capacity at maximum overflow level is 635m3. The over side 500mm trailing suction pipe can operate down to a maximum depth of 12.5m. The pipe is fitted with a trunnion gantry, gimbal joint and drag head gantry and the drag head and is fitted with a conventional IHC 105-32.5-50 dredge pump driven by a Mirrlees Blackstone ES6M6R 470 hp engine. The Jet water pump is driven by a Cummins QSL9 285 hp engine and provides up to 120 psi at the drag head. Discharging is via the 8 bottom doors, or via the port side pump ashore connection with the IHC dredge pump. The hopper is fitted with an adjustable overflow.  Mounted at the forward end of the hopper is a Hitachi Dragline Crane with a SWL of 5 tonne at 45° and fitted with a 1.2 m3 Clamshell Bucket. The vessel is also fitted with a four-point mooring system and when used in conjunction with the Dragline Crane is useful for dredging in confined areas.
Dredging Software is HYDROPRO, which is displayed on 3 monitors and used in combination with the IHC Load and Draft Management program which was installed when the vessel was built.
 
BRIDGE
The bridge is full width with access to the wing decks each side. The bridge is equipped with the ships handling equipment in the forward area with the navigation area aft of this amidships. The dredging console is located to starboard forward with the associated dredge monitoring equipment.
Much of the equipment on the bridge deck appears to be a mix of original and relatively new equipment and all appears to be operational.
 
Bridge equipment includes:
1 x Furuno 1835 36m Marine Radar
1 x Trimble Nav Trac XL GPS
1 x Simrad HS70 GPS Compass
1 x Simrad AP70 Auto Pilot
1 x Vespermarine AIS
1 x Furuno BR-510 BNWAS
1 x Echotrac echo sounder
1 x Uniden Oceanus VHF transceiver with DSC, DSC controller and watch receiver.
1 x Shakespeare SE 2510 VHF transceiver 
1 x Codan 6801-S Mk 2 MF/HF SSB Transceiver with antenna tuner  
1 x Sailor R501 2182 Watch keeping Receiver
1 x Raytheon Wind Display
1 x Kannad Marine 406 MHz EPIRB
3 x LCD Dredging Monitors
Phonico intercom phone system
Sestral Magnetic compass with reflector tube.
Ships clocks and barometer
Sestral Inclinometer
1 x searchlight
 
LIFESAVING EQUIPMENT
There are two inflatable life rafts carried, a RFD 4 man unit on the starboard side and a Surviva 12 man with Solas B pack on the port side, both with hydrostatic releases.
All other safety equipment as per the SSM requirements is provided.
 
DECK GEAR
On the foredeck are twin, electro hydraulic windlasses. Each has a chain gypsy, captive reel drum and warping drum.
The vessel has 3 x Stockless anchors, two set up in hawsers in the bow and one spare stowed aft of the forecastle. Each anchor weighs 760 kgs and has 28.5mm studded link chain with a length of 6 shackles on each cable.
Appropriate fairleads, panama chocks, guide rollers and bollards are located around
the deck for line handling. 
On the aft Poop deck are two electro hydraulic windlasses, each winch has a captive reel drum and warping drum and a gantry adjacent, which are utilised as part of the vessels four point mooring system. 
Appropriate fairleads, panama chocks, guide rollers and bollards are located around
the deck for line handling.
 
DOMESTIC EQUIPMENT
The galley area is adequate and well laid out with a stainless-steel sink top with twin basins and Formica work space. Domestic galley equipment includes:
Panasonic Microwave oven
A domestic type refrigerator and freezer
A domestic type stove and oven.
A stainless-steel range hood over the cook top.
A Zip instant hot water dispenser
Two chest freezers
The heads are all stainless steel domestic type bowls with gravity flush. Black water is collected in the Blackwater tank.
The showers and vanities have pressure hot and cold water.
 
SURVEY STATUS
The vessel was built to Lloyds Register classification and was maintained in LR survey until 2013 when owners decided to let the LR class lapse due to the costs involved to maintain her in class. 
The New Zealand Certificate of Survey was renewed in September 2017 and expires on the 26th September 2022.
 
SUMMARY 
An efficient dedicated trailing suction grab hopper dredge that is well maintained and is predominately worked off New Zealand’s West Coast.  Due to the vessels relatively small size, maneuverability and capability of dredging and dumping in shallow waters, makes her a sort after and versatile dredge.

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IMPORTANT: The Company offers the details of this vessel in good faith but cannot guarantee or warrant the accuracy of this information nor warrant the condition of the vessel. A buyer should instruct their agents, or their surveyors, to investigate such details as the buyer desires validated. This vessel is offered subject to prior sale, price change, or withdrawal without notice.

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