I.
DESIGN CHARACTERISTICS
11.
Design Philosophy
?
Economical operation
?
Maintenance friendly
?
Robustness
? High
payload
?
Large tankcapacities
? Flexible cargo
? Worldwide service
22.
Intent & Definition
This specification is
intended to describe the construction of a twin screw Anchor Handling,
Towing, Supply and fire fighting Vessel (AHTSV) completely outfitted and
equipped for rescue, offshore supply and other related duties. The
Vessel will be classed for Unrestricted Service.
The Anchor Handling
Tug Supply Vessel is to tow, supply, support and act in the capacity of
a safety vessel for offshore drilling and work-over rigs in the
operational areas on a twenty-four (24) hour per day basis. Vessel shall
be capable of operating in all seas and weather conditions, which may
occur. Vessel may be utilized for any duties within the capabilities of
the vessel
The Vessel shall be
equipped with two (2) Controllable Pitch Propeller, one (l) stern
thruster and one (1) bow thrusters. The Vessel may be of single hull but
to have double skin in way of the E/R. All accommodation and
wheelhouse shall be forward and an open flat deck area aft for deck
cargoes. For further details see the relevant sections of this
Specification.
While most of the
functions and equipment requirements have been indicated herein after
but it may not be exhaustive. Hence any item or equipment essentially
required to proficiently utilise this type and size of vessel shall be
provided by the builder, irrespective of whether or not the same are
specifically detailed in this specification. The builder will ensure the
safe and effective operation of all the systems, equipment and machinery
provided on board, by providing suitable guards, platforms, accesses,
communication facility, clear visibility, tools or any other accessories
as required for satisfactory operation. Charter party specification
requirements for the scope of service for this vessel, as annexed, are
to be complied with, if not included this specification.
33.
Operational Requirements
The Vessel is to be
designed in such a way that the following roles can be obtained:
a) Transport fresh
water, diesel oil, deck cargoes, bulk cargoes (cement/Barites/Bentonite)
liquid mud, stores, materials & equipment.
b) Tow / move Rigs
c) Anchor handling
d) External fire
fighting
e) To berth and/or
hold station near offshore platforms to safely transfer passengers,
liquids, deck and bulk cargoes.
g) Rescue personnel
fallen overboard and pollution control
h) Oil recovery
operations
i) Operation to be
24-hours/day continuous operations, capable of remaining on station for
a minimum of 15 days.
4.
Rules & Regulations
The Vessel and its
equipment shall be designed and built in accordance with International
Shipbuilding Standards in respect of general hull, marine engineering
and electrical equipment and International Rules and Regulations which
are in force at signing of Contract/ Keel Laying. Rules which may come
into force prior delivery of the vessel shall be treated as
modification.
? SOLAS 1974 for
cargo ships with all subsequent amendments.
? International Load
Line Convention 1966 (Type ?B? Freeboard)
? International
Tonnage measurements 1969
? The International
Convention for Prevention of Pollution from Ships, 1973 and Protocol
1978, MARPOL 73/78 including requirements of the Baltic Sea Convention
and all subsequent amendments
? Radio Communication
Regulations to Government Regulations for GMDSS for Area A1 & A2 and
wireless safety requirements
? International
Regulations for Preventing Collisions at sea, 1972 including amendments
of 1981
? ISO std. 6954 ?
Guideline for overall evaluation of vibration in merchant ships.
? IMO A343 ?
Recommendation on methods of measuring noise levels and measuring points
? IMO 469 (X11) -
Guidelines for the design and construction of offshore supply vessel
? Resolution A574
(14) ? Recommendation on general requirements of Electronic Navigation
aid.
? International
Electrical Commission (IEC) publication 92 ? Electrical installation in
Ships
? International
Telecommunication Convention with the latest amendments including
requirements for GMDSS.
? ILO convention
concerning crew accommodation on board ships (Nos. 92, 133-1970, 152,
140 &141)
?
Classification society
rules (VR+ another classification society)
54.
Environmental Conditions
The vessel, plant,
machinery and equipment, their components and related systems shall be
entirely suitable for service under the following conditions:
? Sea water
temperature 360C
? Ambient air
temperature 500 C
? Relative air
humidity 92%
? Wind velocity 18
m/sec
? Significant wave
height 3.0 m
? Current velocity
1.0 m/sec
? Wave period 10 sec
II.
Result of basic design
1.
Main Features
? Bollard pull 55 t
? Large cargo
deck 320 m2
?
Deadweight
~ 950 t
? Gross
tonnage 1120 t
? Net
tonnage 336 t
? Max. speed
14.5 knots
?
Accommodation 24 persons
2.
Main particulars
?Lenght O.A. 57.00 m
?Length PP
49.00 m
?Beam moulded
13.50 m
?Depth moulded
6.00 m
?Draft
summer 4.20 m
3.
Cargo Capacity
Clear Deck Area
11.1m
x 29.2m
320
m?
Deck Strength
5.0 t/m?
Deck cargo
500 t
Fuel Oil
~ 550 m?
Potable
Water
~ 400 m?
Drill Water
~ 600 m?
Ballast
Water
~ 800 m?
Liquid Mud
~
300 m?
Dry bulk
4 x 50 m?
4.
Discharge Rates
Fuel Oil
1 x 100 m?/hr
Potable Water
1
x 100 m?/hr
Drill Water
1 x 100 m?/hr
Mud
1 x 75 m?/hr
Dry bulk
60 t/hr
5.
Machinery
Main Engines
Two
diesel engines total 4500 BHP
Main
Generators
2x370 kW, 60 HZ
Harbour Gen
1 x 250 kW, 60 HZ
Emergency Gen
1x60
KW
Bow
Thruster
1x560 BHP tunnel
Stern
Thruster
1x560 BHP tunnel
Propulsion
2xCPP with Nozzle
Rudders
2 x independent flap type
6.
Speed & Consumption
Trial
speed
14.5 knots ~ 15 T/day
Econ.
Speed
10 knots ~ 9 T/day
DP
~ 2.0 T/day
7.
Accommodations
Fully air-conditioned
Accommodation for 24
persons
- 2x 1 men cabin
- 6x 2 men cabin
- 2x 1 men spare
cabin
- 2x 4 men cabin
- Mess/day room
- Change room
- Linen room
- Galley
- Provision
- Coldstore
-?
Navigation bridge
with 3600 view
8.
Extra Equipment
Rescue Zone - Port & Std side
Oily Water Separator - 1 x 1 m?/hr
Water Maker ? 1 x 5 t/day
9.
Fire Fighting Equipment
External:
1 x 1500 m? / hr pumps
1 x 1200 m? / hr monitors (w/ remote
control)
Internal:
Emergency Fire Pump
CO2 System in
en. room
Fire Detection & Alarm
System throughout vessel
Electrical BA Recharging Compressor
75ltr/min
10.
Safety/Lifesaving Equipment
Search Lights
3
x 2000 W
Floodlights
5
x 1000 W
Liferafts
As
per SOLAS Req.
Lifebuoys
8
pcs with buoy lights
Life Jackets
48
pcs
Immersion Suit
48 pcs
Rescue boat
As
per SOLAS Req.
Air Breathing
App
6 sets apparatus
11.
Communication & Navigation Equipment
2 x GMDSS VHF
(semi-duplex)
1 x Satellite EPRIB
2 x VHF Radio (2-way
portable)
2 x SAT -OFI
1 x Navtex Receiver
1 x X-Band Radar
1 x Echo Sounder
1 x GPS Plotter
1 x Gyrocompass
1 x Weather Fax
1 x Speed log
12.
Towing & Anchor Handling Equipment
AHT Winch
250
t two drum waterfall AHT winch, each drum 150 t pull
Spare Tow Reel
1x20 t
pull
Tugger Winches
2x10 t
pull
Capstan/Mooring
2x7.5 t
Windlass/Mooring
1x10 t
pull
Winches ?..
Bow Anchors &
chains ?..
Sundry
Equipment
?..
Best Replica Watches
III.
Result of marine propulsion design (CFD test)
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