Conversion Candidate · Cable Lay & Repair Conversion

ST327L

Geo Caspian — Skipsteknisk CD · Turnkey Conversion to a Carousel-Equipped Cable Lay Vessel

Design Skipsteknisk CD Built 2010 · Fosen Mek, Norway

A 24 m beam sister hull to Geo Celtic, delivered by Dimension as a turnkey conversion through partner shipyards, with leading vendor support across the mission spread — ≈3,600–4,000 t of fibre-optic cable (3,400 t carousel plus 600 t spare tanks), or ≈2,500 t of power cable — with 167 t continuous bollard pull, the highest in the fleet, and dedicated inter-array cable (IAC) handling. The complete fibre-optic mission spread is supplied new.

Vessel NameGeo Caspian

IMO9525560

Built2010 · Fosen Mek, Norway

ClassificationDNV ✠1A1 Clean(Design) COMF(C-3, V-3) DK(+) E0 HELDK(S, H) NAUT(AW) RP SF TMON

Teal-flagged items in the specification below denote new or modified equipment within the conversion scope.

Bollard Pull & IAC Capability

Highest Bollard Pull in the Fleet

A near-sister to Geo Celtic, sharing the same 24 m beam and 20.5 m carousel arrangement — but with the fleet's highest bollard pull at 167 t and a dedicated power-cable spread, making ST327L the candidate of choice for combined lay, burial and inter-array cable (IAC) scope.

24 m beam takes a 20.5 m carousel — ≈3,400 t of fibre-optic cable, or ≈2,500 t of power cable, plus spare tanks for a further ≈600 t of fibre-optic capacity, ≈3,600–4,000 t working load.
Class-leading bollard pull — 167 t continuous bollard pull, the highest in the fleet, with a dedicated power-cable spread (30 t quadrant, 5 t and 15 t tensioners) for IAC work.
An all-new mission spread — burial ROV, DOHB, stern sheaves and MD3-XT plough, all new and supplied through Dimension's vendor partners.

The Conversion

Retained & New

Dimension delivers this as a turnkey conversion — engineered in-house and executed through partner shipyards, with leading vendor support across the carousel and cable-handling spread. The existing equipment comes out, releasing around 900 t of lightweight. The carousel goes in below deck in place of the main hold, with the surrounding spaces reworked as cable machinery, test and termination, and jointing.

RRetained — Hull, main generator plant, accommodation for 70 plus hospital, ballast and fresh water systems.
NNew (≈1,480 t, plus 183.5 t plough spread carried separately) — Carousel, cable machinery and spread, power-cable spread, ROV and LARS, stern thruster, DP2, ESS.
TTimeline — 12–14 months, subject to equipment lead times.

Technical Details

Principal Particulars

Principal Particulars
Design	Skipsteknisk CD
Built	2010 · Fosen Mek, Norway
Length overall	108 m
Beam, hull / extreme	24.0 / 28.0 m
Max draught	7.5 m
Gross tonnage	12,708
Deadweight	≈5,960 t
Fresh water production	50 m³/day
Cable Capacity — Converted
Installed tank capacity	3,400 t carousel + 600 t small · ≈4,000 t installed · Ø20.5 m
Fibre-optic cable, working load	≈3,600 – 4,000 t
Power cable capacity	≈2,500 t
Stowage form	Below-deck carousel
Power & Propulsion
Main generators	2 × 4,320 + 4 × 1,665 kW
Total installed power	≈15,300 kW
Propulsion	2 × 4,500 kW, CPP in nozzle
Bow thruster	2,000 kW tunnel
Stern thruster	1,200 kW — new
Retractable azimuth	2,200 kW
Energy storage	1,500 kWh ESS — new
Performance, Accommodation & Class
Max / cruising speed	16 / 14 kn
Endurance	39 days at sea
Fuel / fresh water	2,450 / 475 m³
Continuous bollard pull	167 t
Dynamic positioning	DP2 — retrofit
Persons on board	70 single cabins, plus hospital
Classification	DNV · Clean(Design) · DK(+)

All-New FO Cable Handling Spread

Burial ROV · DOHB · Stern Sheaves · Plough · Power-Cable Spread

Cable Handling & Deck — All New
Carousel, below deck	Ø20.5 m · 3,400 t FO
Lay & burial ROV	SMD QT600
Burial depth	3.0 m · 2,500 msw · 450 kW
Drum cable engine	SMD, Ø4.0 m, 40 t
DOHB	4 wheel-pair, 4 t
Stern sheaves	2 × Ø3.5 m
Power cable spread	30 t quadrant · 5 t and 15 t tensioners
Plough	SMD MD3-XT
Plough trench depth	3.3 m · 80 te tow load
Plough LARS	A-frame 60 – 100 t SWL
Work-class ROV	2,000 m rated, with LARS
Lay control	Makai Lay + Plan · ROV-referenced