12.8m Aluminum Hydrologic Survey Boat

1. General Description

1.1 The boat hull type is single hull. The main hull is applied by marine grade steel material. The wheelhouse is applied by aluminum alloy material.

Hullmaterial: marine grade B steel

Superstructure material: Aluminum plate 5083H116 and Aluminum stiffener 6061

1.2 The boat is special serve in coastal area.

1.3The boat is to be designed and built in accordance to Singapore PSA safety rule.

2.0 Technical principles

2.1 Main Particulars

Length Overall 12.80m

Length waterline 11.68m

Beam Overall 3.80m

Depth 1.82m

Design draught 0.72m

Max. Speed 22knots

Cruising Speed 18knots

2.2 Loading availability

(1)Cargo load

The boat is capable of load 12 passenger and 1 ton cargo.

(2)Crew

There are 2 crew, according 75kg weight per seaman.

(3)Fuel tank capacity

Fuel tank capacity: 800litres

2.3 Performance

(1) Displacement

Full load displacement:~12.5ton

(2)Speed performance

When engine running 2300rpm,the boat speed will performance reach 18 knots in cruisingand max. 22knots.

(3) Endurance

Under effective load condition, Maximum endurance is 10 nautical miles at 18knots speed in coastal water.

3.0 Propulsion System

3.1 Main Engine

The boat is installed two sets Shanghai Diesel engine,particular parameter as blow:

Model D683ZL3B

Rated: 225kw/2300rpm

Max power: 257.5kw/2369rpm

Weight(Dry weight): 800kg

3.2 Gearbox

The boats gearbox is selected China Hangzhou gearbox:

Model:HC120C

Gear rate:1.94:1

3.3 Engine throttle controller

MT3 twin throttle controller: Teleflex(maker)

3.4 Manual Steering gear

Maker: Sea star

Toque: 82kgm

Cylinder: SeastarHC5314-3

Steering pump: HH5271

3.5 Propeller Shaft and propeller

The two propeller shaft will be used diameter 57.15mm stainless steel 316 shaft. The propeller will be used Ni-bronze 5 blades high speed propeller.

3.6 Rudder

The boat will be used stainless steel 316 rudder blade and rudder shaft.

4.0 Piping System

4.1 Bilge water system

The four sets DC bilge pump with automatic electric submersible switch will be placed in rudder compartment, engine room, accommodation and void area. Each bilge pumps capacity as 1500GPH. The bilge pump is to be discharged overboard.

4.2 Cooling system

The cooling system is to be supplied with seawater. Engine rooms will have a sea inlets mounted in the bottom plate. Seawater pump is built in the engine. The sea inlet grid free area will be at least three times the pipe sectional area. Shut-off valves and easily removable strainers will be fitted.

5.0 Ventilation

The engine room space is to be fitted with 2 sets of DC motor driven fan to ventilate engine.

6.0 Electrical System

6.1 DC Power

The main electrical system is DC 24 volts; with a two-wire insulated marine cable throughout, with all cables, breakers etc, generally to marine standards.

The propulsion units will be provided with starting batteries adjacent to the engine, having an approximate capacity of 200 Ah.

In addition there will be provided two sets of batteries of 200 Ah to supply power for services, lighting and other equipment.

6.2 Control Panel

-DC panel with switch (for lighting, compass, navigation lights etc) 1 set

-Bilge water alarm panel 1 set

6.3 Wipe

Manufacturer: Taiwan

Voltage: 24V

Arm Material: Stainless steel 316

7.0 Lighting

7.1 Internal Lighting

Four dome lights (approximately 25 Watts each) fittings are to be provided in the wheelhouse, along with full 24v instrument illumination, console-mounted button.

The four fluorescent (approximately 25 Watts) fitting is to be provided in the rudder room, engine room, void space and accommodation.

7.2 Searchlight

A 100 w, 24v searchlight is to be fitted to the wheelhouse top and to be adjustable from within the wheelhouse.

8.0 NAVIGATION EQUIPMENT

8.1 Navigation equipment:

-Deck floodlight

-Anchor light

-Stern light

-Engine room light

-Compass

-Horn

9.0 Outfitting

-Aluminum frame window and aluminum door

-Rubber “D” fender

9.0 Paint

9.1 General

All surfaces and welding seam are to be power brushed and properly clean up after construction, roughened and primed with one coat primer of 25 micro and one coat of epoxy primer × 25 micro to be coated (internal & external).

9.2 Schemes

Following specifications based on Jotun coating System are for guidance. Other specifications of equal standard would be acceptable.

-Keel to waterline Dry film Thickness

2 coats × 125 micro. Coal tar Epoxy 250 micro.

2 coats × 75 micro. Anti-Corrosion 150 micro.

2 coats × 75 micro. Anti-Fouling. 150 micro.

-Waterline to Deck Dry film Thickness

2 coats × 100micro Coal tar Epoxy 200 micro.

1 coat × 100micro White finishing. 100 micro.

-All welding and damages on deck superstructure and internal hull to be machine wire brushed before paints.

1 cost white × 125 micro.

1 coat Finish Green (non-skid) × 50 micro.