Anchor Handling Tug Supply Vessel

C. HARSHA NA07B007DEEP SUNDAR NA07B012

• Offshore supply vessels specially designed to provide anchor handling and towage services for semi submersibles, platform jackets, barges and production modules/vessels.

• Some Anchor handling tug supply (AHTS) vessels are equipped for fire fighting, rescue operations and oil recovery also.

• AHTS vessels range from small and compact vessels to large and powerful ships. ( 30mts to 100mts ) They can be fitted with the world’s largest advanced winches, providing tremendous pulling power for working at the deepest depths

AHTS

Towage Services• Anchor handling tug supply (AHTS)

vessels tow oil drilling rigs or jacket platforms to their location and back, behaving like an ordinary tug.

• For towing Anchor handling tug supply (AHTS) vessels have very high power engines (~12000bhp) for an enhanced towing and anchor handling capacity. They have more power to increase the bollard pull.

–*Sea Eagle 1*• Modern vessels are capable of positioning and

mooring drilling rigs in any location, at virtually any depth and under any conditions. – *TIDEWATER*

Anchor Handling• Machinery is specifically designed

for anchor handling operations.• They have an open stern to allow

the decking of anchors.• They have arrangements for quick

anchor release.• Fitted with powerful winches for

quick and effective anchor handling.

Other Secondary Uses• Fire Fighting: Modern vessels are

fitted with pumps that can spray water.

• Rescue Operations: They have a large deck area and exhibit good stability suitable for rescue operations. Sea Eagle 1 can carry a maximum weight of 2,300t without submerging.

• Oil Recovery: Modern vessels are fitted with suction pumps that can be used to clean in case of oil spills.

Machinery on board a typical AHTS

DECK MACHINERY

Anchor Windlass 1Deck Crane ( Telescopic type) 2 - 3Tugger Winches 2Towing and Anchor handlingwinch 2Towing pin and shark jaw 1 (hydraulic)Mooring winches 4Mooring Anchors 4

A Towing Pin and Shark Jaw

Main Machinery• Main Engine• Steerable thruster• Tunnel thruster• Generator• Harbor generator• Emergency generator• Air compressor• Air receivers• Bilge/ballast pump• Fire pump• Fuel oil Cargo/ transfer pump• Drill water pump

80 TON BOLLARD PULL AHTS

L AHTS

HALUL OFFSHORE SERVICES Co. W.L.L

Owner : Halul Offshore Services Company W.L.LBuilder : TBA

Classification: LR / IAACS Member

Halul Offshore Services Financial Status

GENERAL SPECIFICATIONSOUTLINE• Twin screw Anchor Handling,• Towing, Supply and fire fighting

Vessel completely outfitted and equipped for rescue, offshore supply and other related duties.

• Operational on a twenty-four (24) hour per day basis.

• Vessel shall be capable of operating in all seas and weather conditions, which may occur.

Operational Requirements• Transport fresh water, diesel oil,

deck cargoes, bulk cargoes (cement/Barites/Bentonite) liquid mud, stores, materials & equipment.

• Tow / move Rigs• Anchor handling• External fire fighting• Transportation of passengers to

and from Oil field, located offshore in the State of Qatar

Operational Requirements• To berth and/or hold station near

offshore platforms to safely transfer passengers, liquids, deck and bulk cargoes.

• Rescue personnel fallen overboard and pollution control

• Helicopter hoisting facilities• 24-hours/day continuous

operations, capable of remaining on station for a minimum of 15 days.

Operational requirements• Good maneuverability and station

keeping1.Twin controllable pitch propellers2.Twin rudders / Azimuth Thrusters 3.Bow and stern thrusters• Wheelhouse is designed to ensure

excellent all-round view.1.full-length windows and deck head

windows2.Additional CCTV monitoring with 3

cameras (zoom and wide angle)

Endurance Requirement

• Provide a stable platform/deck even in rough weather conditions.

• To minimize pounding and rolling, the main weight should be concentrated mid-ship and aft and the hull form should feature a fine bow with flared section above waterline.

Principal Particulars

• Dimensions (approximate):• Length overall 70.00 m• Breadth moulded 16.00 m• Depth moulded 7.00 m• Draft Scantling 6.50 m• Draft loaded (Maximum) 6.00 m

• Performance:• Dead Weight 2500 T• Bollard Pull 80 T • Trial Speed at100% MCR & 4.5m draft 13.5 Kts• Service Speed at 85% MCR & 4.5m draft 12.5 Kts• Endurance 15 days at

service speed

MachineryMain Engine 2 x ~2750 KWPropulsion System conventional or AzimuthGenerating Set 3 x ~400 Kw (diesel driven)Shaft Alternator 2 x ~1200 KW (each)Emergency Generator 1 x 120Kw (diesel driven)Main Engine driven Fi-Fi pump 2x1650 cu. m Bow Thrusters 2x~500 KWStern Thrusters 1x~500 KWFuel Oil Cargo Pump 2x~100 cu.m/hr . @75m headFresh Water 2x~100 cu.m/hrDrill Water Pump 2x~100 cu.m/hrMud Pump 2x~100 cu.m/hr

Complement• Crew 18 men• Hospital 0 men• Special personnel 20 men• Total 38 men• Clear ceiling is not to be less than

2150 mm (average) generally in accommodation spaces

• The accommodation is well appointed and centrally air-conditioned.

Classification• The vessel including its Hull,

Machinery and outfitting equipment shall be constructed in accordance with the latest Rules for Building & Classing of Steel Vessel to Lloyd Register of Shipping.

• Rules which may come into force prior delivery of the vessel shall be treated as modification.

Registry• The vessel will be registered at Doha,

under the flag of Qatar.

Rules & Regulations• SOLAS• International load line convention• International convention for

prevention of pollution by ships• Radio communications regulations• Regulation for Prevention of collisions

at sea• IMO, ISO and many others

Certificates• Builder’s certificate• Classification certificate• safety equipment, construction, radio

certificate• Load line certificate• Tonnage certificate• IOPP certificateand many others

Materials & Workmanship• good shipbuilding quality• test certificates• good welding quality• Blasted and primed before using.• Only mild steel to be used for hull

structure• All visible plates are to be smooth and

straight• Makers List• All timber to be impregnated against

rot, infestation and free from odour.

Welding• Contract plans, specification &

classification requirement.• High standards of up-to-date

welding practice• Alignment, fairness, edge

preparation and gap widths.• Continuous welding is to be used

for all the structure up to uppermost continuous deck and weather exposed area.

• Intermittent welding to be used only inside the superstructure.

Inspection/Supervision• surveyors, owner’s representative and

consultants are to be given free access to the builder’s yard.

• Qualified personnel shall be in attendance during installation, commissioning , testing , dock trials and sea trials as necessary at builder’s expense.

• QAP Plan showing inspections and control points by class and owners representatives, within 2 months of contract signing.

Tests• Shop Trials• Onboard Trials• Alternator set load trials• Hydrostatic pressure tests• Sea trial

1. Speed trial2. Endurance trial3. Steering and turning circle trial4. Stopping and astern trial

• Inclining test • Environmental conditions• Trim and stability

• Dock trails Dock trails are carried out in

accordance with a programme agreed between builder and the owner

• Trim and stability

Drawings• General arrangement• Hydrostatic curves• Stability booklet• Dimensional profile• Docking plan• Anodes plan• Structural profile and deck• Midship section

Drawings• Engine seating detail• Forward sections• Aft sections• All transverse and longitudinal bulkheads• Superstructure detail• `A’ bracket details• Shafting arrangement• Rudder arrangement

Drawings• Rudder stock and rudder drawing• Anchoring and mooring arrangement• Deck outfit plan• Ship’s fuel oil and Lube oil system• Engine room layout• Thruster tunnel details• Refrigeration system• Schematic wiring and reference to fittings

Drawings• Shaft generator arrangement• Ventilation arrangement• Cargo securing manual• Fire safety operation booklet• Training manual for fire fighting• Well killing liquid system• External FI-FI system• Layout of manholes and hatches

Drawings• Mast drawing• Bulk cargo system• Purification system• Painting scheme• Fendering plan• Towing and anchor handling arrangemet

and details including all the equipments onboard like stern roller, tow pins, shark jaw, towing bollard, AHT winch etc.

• Environmental conditions The vessel, plant, machinery

and equipment, their components and related systems shall be entirely suitable for service under following conditions

• Sea water temperature 36C• Ambient air temperature 50C• Relative air humidity 92%• Wind velocity 18m/sec• Significant wave height 3.0 m• Current velocity 1.0m/sec• Wave period 10 sec

• Framed Plans• Vessel Operating Manuals• Manuals of Machinery and Equipment• Spare Gear and Tools• Practice• Modification• Ship’s Model A scale of 1:100 shall be supplied • Model test • Delivery

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