osv rules singapore
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OSV Rules SingaporeTRANSCRIPT
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August 2009
Class Rules and Complementary CFD Simulations for Offshore Service Vessels (OSVs)
Helge Rathje, Thomas E. Schellin, and Jan Kaufmann
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August 2009 OSV Rules No. 2
Class Notation: Offshore Service Vessel - OSV
Statutory Rules: Resolutions, Guidelines, Codes, etc.
Design and Construction IMO A.469 (XII)
Transport of Hazardous Liquid Substances IMO A.673 (16)
Dynamic Positioning IMO MSC/Circ.645
Safe Practice for Carriage of Cargoes and Persons IMO A.863 (20)
Prevention of Collisions at Sea COLREGs (1972)
Practical Constraints
Guard rails
Double bottom and stern tubes
Bridge visibility
Navigational lights
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August 2009 OSV Rules No. 3
Additional Class Notations
Oil recovery and transportation_____________________________________________
Special Purpose Ship
Oil Recovery______________
SPS
Standby and rescueStandby
Fire fightingFire Fighter
Well stimulationWS
Anchor handlingAH
Carrying hazardous and noxious liquid substancesHNLS
Offshore Service VesselOSV
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August 2009 OSV Rules No. 4
Offshore Service Vessel - General
Hull Arrangement and Strength
Cargo Handling Arrangement
Intact Stability
Subdivision and Damage Stability
Superstructures and Deckhouses
Windows and Side Scuttles
Equipment
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August 2009 OSV Rules No. 5
Hull Arrangement and Strength
Special requirements for fenders, frames, shell plating, and side longitudinals
Cargo deck plating minimum thickness of 8 mm
strengthened deck in areas of heavy cargo units (drilling rig anchors)
wooden sheathings should cover the deck
Stow racks, steel cradles, or steel or wooden dunnage to uniformly distribute cargo weight in deck structures
Freeing ports to ensure drainage of water trapped in pipe deck cargoes and in
recesses at aft end of forecastle
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August 2009 OSV Rules No. 6
Cargo Handling Arrangement
Special requirements
ships that occasionally handle, store, and transport recovered oil from a spill
ships intended for transportation of liquids with flash point below 60C Cargo pumps
remote shut down devices
segregation between cargo piping systems by means of spectacle flanges, spool pieces, etc.
Cargo tanks for dry cement or mud
to be separated from engine room and accommodation spaces by steel bulkheads and decks
Tanks for hazardous and noxious liquid cargo
quantities of cargo are limited (800 m or 40% of ship deadweight)
separated from other spaces by cofferdams
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August 2009 OSV Rules No. 7
Intact Stability Stability manual
to assess the ships stability in different service conditions
Loading conditions
ship fully loaded departure and arrival
ship in ballast departure and arrival
ship in worst anticipated operating condition
ship while towing
Assumptions for calculating loading conditions
cargo tanks are full as well as empty
account for deck cargo and water ballast
account for free surface effects of partially filled tanks
Stability requirements for towing
maximum righting lever > 50% of heeling lever caused by pull of towing line
account for effects of anti-rolling tanks
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August 2009 OSV Rules No. 8
Subdivision and Damage Stability
Damage stability manual
limiting VCG and GM values
permissible range of static stability of operation
Assumptions for calculating loading conditions
damage anywhere along the ships length between transverse watertight bulkheads
vertical and transverse extent of damage
account for progressive flooding caused by tunnels, ducts, pipes, etc.
account for permeability of damaged compartments
Damage stability criteria
account sinkage, trim, and heel caused by progressive flooding through openings
heel angle from asymmetric flooding < 15 or 17 if the deck does not immerge stability must be sufficient during intermediate and final stages of flooding
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August 2009 OSV Rules No. 9
Windows and Side Scuttles
Windows
2nd tier and higher above freeboard deck in aft deck end bulkhead and in deckhouse sides
3rd tier and higher above freeboard deck in forward bulkheads of deckhouse
Deadlights and storm covers on windows
at deckhouse sides in 2nd and 3rd tier and at aft end bulkheads
wooden sheathings should cover the deck
on windows in wheelhouse front
Side scuttles
to comply with ISO Standard 1751
Arrangement of windows and side scuttles
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August 2009 OSV Rules No. 10
Equipment
Towing arrangement to satisfy requirements for anchor handling tug/supply vessels
Steering gear capable of changing rudder angle from 35 to 30 on the opposite side in 28 s
Exhaust outlets to be located as high as practical above deck
to be fitted with spark arresters
Anchoring equipment
increase diameter and length of chain cables above minimum class requirements
Chain locker arranged as gas-safe spaces
hull penetrations for chain cables to be arranged outside gas-dangerous spaces
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August 2009 OSV Rules No. 11
HNLS Vessel for Carrying Hazardous and Noxious Substances
Products that may be carried
hazardous and noxious liquids listed in table of permitted cargoes for chemical ships
noxious liquids that would be permitted for carriage on chemical ships (flash point < 60C)
Cargo area
includes cargo tanks, cargo pump rooms, hold spaces, cofferdams, ballast or void spaces surrounding integral tanks, and deck areas
Cargo segregation
by means of a cofferdam, void space, cargo pump room, empty tank, or fuel oil tank
separate pumping and piping systems, separate venting system
cargo not to be carried in fore or aft peak tanks
Cargo tanks
to be constructed according to rules for gas ships or chemical ships
to have vapor detection and alarm systems, gaging and level detection systems, emergency shutdown systems, decontamination showers, and protective safety equipment
Accommodations, machinery spaces, and control stations
not to be located within the cargo area
entrances, air inlets, openings, service and machinery spaces should not face the cargo area
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August 2009 OSV Rules No. 12
AH Anchor Handler
Structural configuration clear deck
winches to deploy and recover anchors
stern roller
chain lockers under the main winch
shark jaws, towing pins, heavy duty bollards
reinforced shell plating
Working deck deck area protected by wooden sheathing
Equipment foundations to be reinforced for deck equipment, such as winches and stern rollers
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August 2009 OSV Rules No. 13
WS Well Stimulation Vessel Arrangement
tanks and pumps not to be located within accommodation areas
tanks for acid and liquid nitrogen to be located at least 760 mm from ships sides and bottom
tanks and piping systems for well stimulation to be separated from machinery
acid spill protection is to be provided
emergency shutdown systems
Ventilation independent ventilation systems for spaces housing installations for acid
enclosed spaces containing tanks, piping, pumps, etc. to have entrances from open deck through air locks with independent mechanical ventilation
Liquid nitrogen system, acid system in accordance with special requirements
Personal protection decontamination showers
personal protective equipment
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August 2009 OSV Rules No. 14
Fire Fighter
Service notation category 1 for early stage fire fighting and rescue
category 2 for continuous fire fighting of large fires from a safe distance
category 3 larger water pumping capacity and more comprehensive fire fighting equipment
Maneuverability side thrusters and sufficiently powerful propulsion for fire fighting operations
power management system to avoid overloads
Protection against external heat radiation water spraying system
hull and superstructure to be constructed of steel
Water and foam monitors number and characteristics to be in accordance with service notation
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August 2009 OSV Rules No. 15
Standby Vessel
Rescue zone clearly marked rescue zone of at least 8 m length on each side
ships sides to be clear of obstructions (no fenders)
satisfactory lighting along rescue zone
deck area free of pipes valves, hatches, etc.
searchlights on each side of the ship
power assisted scrambling net on each side of the ship
Survivors accommodation treatment room for casualties
Safety equipment at least 1 fast rescue craft
SOLAS approved life buoys
immersion suit for each crew member
lifejackets for crew and survivors
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August 2009 OSV Rules No. 16
Oil Recovery Vessel
Arrangement suitable working deck
storage tanks for recovered oil
adequate visibility from maneuvering station
pumping and piping for transfer and discharge of recovered oil
Fire protection exterior boundaries of superstructures to be insulated to A-60 standard
insulation to A-0 standard is acceptable if water spray system is installed
Tanks cofferdams separate tanks for recovered oil from accommodations and engine room
Hazardous areas zone 0 interior spaces
zone 1 cargo pump room, enclosed spaces with flanges and/or valves, etc.
zone 2 cofferdams and spaces adjacent to tanks for recovered oil
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August 2009 OSV Rules No. 17
Complementary Computations
1. OSV in head seas Design pressures on bow and superstructure
Regular waves:
6.5 m height
7.5 s period
Twin propellers, 500 kN thrust each
2. OSV in following seas Dynamic stability - capsizing
Natural seaway:
4.0 m sig. wave height
7.5 s mean period
Zero speed running of an anchor
Port side of stern rail - open
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August 2009 OSV Rules No. 18
RANS Solver COMET
Nonlinear RANSE computations
Finite amplitude (high) waves
Finite volume method
Interface-capturing technique
Volume of fluid (VOF) method
3D effects, no explicit free surface
Two-phase flow formulation, free surface flows
Overturning (breaking) waves
Flow separation, vortex formation
Air trapping
Disturbed waves
Viscous effects
Fully geometric modeling of body
Principal particulars of OSV
11 000 tDisplacement
6.5 mDraft
22 mMolded breadth
100 mLength bet. pp
Numerical grid on surface of OSV
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August 2009 OSV Rules No. 19
Wave-Induced Loads on Bow of OSVPressure [kPa] at bow
Pressure distribution
OSV in head seas
Max. computed pressure = 118 kPa
Rule design pressure = 105 kPa
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August 2009 OSV Rules No. 20
Capsizing of OSV
Zero forward speed
Following waves, H = 4.0 m
6 DoF motions
Grid morphing technique
Computed pitch Computed roll Computed yaw
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August 2009 OSV Rules No. 21
Mesh DeformationGrid morphing technique mesh adoption to rigid body motions,
enabling computation of large rotational motions
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August 2009 OSV Rules No. 22
Capsizing of OSV in Following Waves
Elapsed time = 200 s Elapsed time = 600 s
Elapsed time = 700 s Elapsed time = 800 s Elapsed time = 900 s
Series of screen shots
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August 2009 OSV Rules No. 23
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August 2009 OSV Rules No. 24
Thank you for your attention