Military


YTL - Harbor Tug

YTL is a small harbor tug, with steel hull, wood deck house, 66 foot long, 18 foot beam and 5 foot. max. full load draft and is used for towing and mooring small boats and barges.

Its use is limited (due to its size, compartmentation, and limited facilities) to operation in protected waters such as harbors, rivers, etc, Principal compartments consist of pilot house, crew's quarters and engine room.

It is driven by one diesel propulsion engine developing 375 horsepower at its single propeller via a reverse reduction gear and propeller shaft. It is equipped with two 20 kw, 120 volt DC diesel driven generator sets for furnishing electrical power to all electric machinery and equipment.

Galley facilities consist merely of a hot plate and sink in pilot house.

PRINCIPAL CHARACTERISTICS

Length

66'-2"

Beam

17'

Draft

7'-10"

Displacement, full

67 Tons

Accommodations 4 Enlisted

TANK CAPACITIES

Fresh Water (Service Tank)

100 gal

Lube Oil (Service Tank)

290 gal

Used Lube Oil 1-1/2 times main engine sump capacity
Air Tank (Service Air)

5 cu ft

Diesel Oil (Service Tank)(for Main Eng.)

100 gal

Diesel Oil (Service)(for Generator & Boiler)

25 gal

PRINCIPAL MACHINERY and EQUIPMENT

Main Engine

Diesel Gen. No. 1

Diesel Gen. No. 2

Air Compressor No. 1

Air Compressor No. 2

Fire Pump

Cargo Handling Winch

HULL

Hull is steel with wood pilot house.

LIFE SAVING

One 10 man capacity life float complete with two paddles is stored over engine room casing.

ANCHOR HANDLING

One bower anchor, deck and handled by a portable gypsy windlass.

FIRE FIGHTING

One motor driven fire pump 200 GPM at 80 psi (valve type) serves two 1-1/2" fire plugs (one at each side of the engine room casing) and one 1-1/2" hose valve located in the engine room. Stowage is provided for 50 foot length of 1-1/2" hose, nozzle and spanner wrench at each fire plug.

Engine room is also protected with a fixed C02 system energized from a bank of C02 cylinders.

FRESH WATER SYSTEM

100 gallon gravity tank located on pilot house top supplies fresh water to sink in pilot house and is also used for replenishing water for the fresh water cooling systems of main and generator engines.

VENTILATION

Engine Room - Natural supply.

SHOP FACILITIES

One workbench with vise and grinder is provided in engine room. Locker for potable tools is also provided.

PROPULSION

One diesel engine, electric start, fresh water cooled with a built-in reverse, reduction gear (3.74:1 ratio) drives a single shaft and propeller developing about 375 HP at 210 propeller RPM. Reverse gear and speed variation are controlled pneumatically from the pilot house with local control available at the engine. Starting and stopping the engine is done at the engine only.

ELECTRIC PLANT

Electric power is generated from two diesel driven battery start, 20 kw, 120 Volt DC, 2 wire generators which are capable of being operated in parallel. One switchboard with meters, circuit breakers, switches, bus bars, etc. is provided for control and distribution of electric power. One receptacle for shore power connection is provided at the after end of deck house for supplying 100 Amp, 120 Volt DC power to tug when tug is idle. Two batteries, each of adequate voltage to start diesel generator engines are provided. Battery charging circuit from main switchboard is provided. One DC/DC MG set is provided for operation of radio transceiver.

LUBE OIL

Two lube oil storage tanks each about 145 gallons capacity with hand transfer pump are provided. One used lube oil tank sufficient to hold 1-1/2 times the capacity of the main engine sump is provided to deposit used lube oil.

FUEL OIL

One service tank (100 gallon capacity) is provided for main engine. One service tank (25 gallon capacity) is provided for generator engines . Hand operated fuel oil transfer pump takes suction from storage tank and discharges into the service tank when replenishment of service tank is required.

INTERIOR COMMUNICATION

Voice communication by means of voice tube is provided between pilot house and engine room.

ELECTRONIC EQUIPMENT

One radio transceiver is provided for ship to shore or ship to ship (limited range) communication.



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