Siem Offshore Contractors
Offshore Subsea Construction Vessel
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OSCV Siem Spearfish

The vessel is an Offshore Subsea Construction Vessel (OSCV) designed and equipped for subsea operation duties such as construction and installation work, inspection and maintenance.

The vessel is of clean design, environmentallly friendly with focus on low fuel consumption through its hull shape and diesel electric machinery.

Download vessel brochure as PDF: Siem Spearfish

Realtime vessel position (MarineTraffic)

Vessel details (MarineTraffic)


This brochure describes an offshore support vessel specially designed and equipped for subsea operation duties. The design is of type OSCV 03.

The vessel is environmentally friendly with focus on low fuel consumption. Precautions equivalent to DNV’s CLEAN DESIGN requirements are incorporated in the design.

With its optimized hull form and bow shape optimized for all weather conditions together with the specified propulsion configuration, the vessel has particularly good seakeeping abilities, station keeping performance and is able to keep a high transit speed.

The vessel’s main services/duties are
Subsea Light Construction and Installation work
Subsea Light Maintenance work
Subsea Inspection work
The vessel is fitted with a
ROV hangar
Offshore crane
Work moonpool
High standard accommodation for 110 persons with low noise levels
Main Particulars
Length overall 120.9 m
Length between p.p. 110.8 m
Breadth moulded 23.0 m
Depth main deck 9.0 m
Max. load line draft midship 6.6 m
Max. deck cargo capacity will occur at draught less than the vessel’s max. draught.
Fuel oil 1,400 m³
Fresh water 730 m³
MEG 300 m³
Water ballast/Drill water 5,400 m³
Deck cargo 3,100 t COG = 1.0 m above deck
Cargo deck area 1,350 m² Free area 10 t/m² aft of frame 87
Deadweight 5,000 t At max draught
Classification and Regulations
Det norske Veritas (DnV) or similar IACS: DNV *A1, E0, DYNPOS-AUTR, DK(+), HELDK-SH, ICE-1B (hull only), ICE-C, SF, BIS, CLEAN DESIGN, RECYCLABLE, NAUT-AW, Comf- V(3)-C(3), SPS Resolution MSC.266(84), Code of safety for special purpose ships, 2008.
Norwegian flag (NIS).
Heeling pump /system
Three off water ballast heeling pumps, with capacity 1 500 m3/h each is installed.
Roll reduction system
Three off Passive roll reduction tank
Joystick system for integrated manoeuvre control of azimuth propellers and side thrusters is installed.
DP II system
The vessel is equipped with Kongsberg K-Pos DP-21 DP II (Dynpos AUTR) system according to specified class.
Reference systems
The vessel is equipped with the following reference systems:
DPS 700
2 x HiPap 501 w/long pole
Radius 1,000 D
Cyscan 1,000 m range
2 x MRU 5
1 x MRU D
3 x windsensors
1 x deepwater echosounder (4,000 m)
3 x Gyro compasses
The vessel is in addition equipped with Furuno current meter.
Navigation system
The vessel is equipped with an integrated bridge system according to specified requirements and regulations.
Communication system
Communication equipment according to GMDSS requirements for Area 3 operation with equipment duplication and shore maintenance utilized to assure availability and sufficient internal communication systems is installed.
Safety Equipment
The vessel has safety equipment according to SOLAS and flag state requirement.
Four off Lifeboats with davit according to SOLAS (100% coverage each side, 95 kgs per pax) One lifeboat is classed as MOB boat.
One off FRC with el. Hydraulic davit, SOLAS approved.
The vessel has accommodation and equipment for 110 persons.
Four (4) off Single Cabins – State cabin
Nine (9) off Single Cabins – Officer cabin
Twenty-one (21) off Single Cabins – Crew cabin
Thirty-eight (38) off Double Cabins – Crew cabin
Each cabin has direct access to private toilet (shower, WC and wash basin).
All accommodation is fully air-conditioned for world wide operations based on chilled water system.
Sewage treatment plant is installed.
The vessel is equipped with a helideck, dia. 26.1 m suitable for Sikorsky S-92, holding DNV-class ”HELDK-SH”.
The vessel is fitted with a work moonpool of 7.2 x 7.2 m. The moonpool to be fitted with baffle zones in order to get optimized sea damping capability.
The vessel is fitted with a ROV moonpool of 5.5 x 4.8 m. The moonpool to be fitted with baffle zones in order to get optimized sea damping capability.
Utility Station
Connection for the following services are provided:
Electrical power (440V/650A, 440V/260A, 440V/160A, 220V/123A)
Data cabling for IT hardwire and fibre optic
Telephone, video signals, intercom and P/A
Fire loop
Sea water cooling
ROV Hangar
The vessel is equipped with a hangar aft of the accommodation for the installation of:
One off Seaonics Overside LARS - 15 t/3,000 m AHC
One off Seaconics Moonpool LARS - 15 t/3,000 m AHC
Deck machinery
To prevent oilspill, all mooring equipment is of electrical type.
Two off Mooring winches aft, 10 tonnes each
Two off Windlass with cable lifters, warping ends and drums
Two off Hydraulic / electric operated mooring platform
Deck Crane
One off Deck / provision crane: 3.0 t - 15 meter.
One off Foldable crane for equipment handling to be arranged in ROV hangar. Capacity: 1 ton – 16 m.
Offshore Crane
One off National Oilwell SWL 250 tons main line -14 m AHC 20 tons whip line -40 m AHC Knuckle boom offshore crane. Depth cap. 3,000 m.
Man riding 10t/40 m on whipline
Main Propellers
Two (2) off Well proven frequency controlled Rolls Royce Comtaz azimuth thrusters Power: Approx. 3000 kW each.
Side Thrusters
All thrusters are of Rolls Royce make.
Two off El. driven side thruster forward: 1,900 kW, freq. controlled.
One off El. driven swing-up thruster forward: 1,500 kW, freq. controlled.
Machinery Systems
Four off F.O. service tanks
One off F.O. settling tanks
One off (+2) F.O. transfer pumps
Two off W.B. pumps
Two off F.W. pumps
Two off F.O. separator, automatic selfcleaning type
Three off L.O. transfer pump
Four off L.O. separator, automatic selfcleaning type
Two off Hydraulic oil transfer pumps
One off MEG pumps
Two off SW cooling pumps for deck equipment
Generator Quant. / Capacity / eKW / Rpm / Voltage V / Freq. Hz / Prime mover
Main generators 4 (Four) / 2760 / 1800 / 690 / 60 / Main diesel engine, of Wärtsilä make
Auxiliary generator 2 (Two) / 750 / 1800 / 690 / 60 / Harbour diesel engine, of Cummins make
Emergency generator 1 (One) / 185 / 1800 / 690 / 60 / Emerg. diesel engine, of Cummins make
Cooling Systems
Cooling systems based on central cooling system. One separate cooling system for each engine according to supplier’s recommendation is installed.
Two off Starting air compressors
Two off Starting air bottles
Two off Working- /instrument air compressor
Two off Bilge pumps
Three off Fire pumps
One off Bilge water separator
Water mist fire fighting system in engine room
Ballast treatment system
Electrical System
Alternating current system, 3 phase, 60 Hz for the general el. system according to DIN and /or IEC norms. System voltages: 690V AC, 440V AC, 230V AC and 24V D

Particulars are believed to be correct, without guarantee.

Want to know more?
Lets have a chat!
Jill Falenschek
Tender Coordinator