Vertical Lay Systems (VLS)

Overview

200 MT-rated modular twin-tensioner Vertical Flexlay Tower engineered by Dimension for deepwater flexible, umbilical and submarine cable installation — twin 100 MT, four-track, 5 m contact-length tensioners stacked in a 28 m tower over a 10 m arc.

Twin 100 MT tensioners — four-track each, 5 m contact length, stacked for redundancy and combined 200 MT continuous-tension capability.
Modular tower platform — 28 m height, 10 m arc diameter (R 5000 mm), bolt-up sections for fast vessel-of-opportunity mobilisation.
ABS / LRS class delivery with integrated A&R, hang-off, work platforms, top jib crane and full automation/HMI-driven sequencing.

Key Features

Twin 100 MT four-track tensioners — 5 m contact length each, summed 200 MT line pull
28 m tower with 10 m arc diameter (R 5000 mm) — ABS / LRS class
Modular bolt-up tower extensions for vessel-of-opportunity mobilisation
Three operating decks at 5.7 m, 13.7 m and 21.9 m elevations with full work platforms and access stairs
Top-mounted jib crane for product handling and equipment lifts
Integrated abandonment-and-recovery (A&R) system, redundant hang-off
Optional active heave compensation (± 2.5 m) for extended weather windows
Suitable for cables, umbilicals and flexible pipe — moonpool, stern or over-the-side
Full automation with HMI-driven sequencing and PLC interlocks

200 MT Modular Twin-Tensioner Vertical Flexlay Tower — full 3D render — 200 MT Modular Twin-Tensioner Vertical Flexlay Tower — 28 m tall, 10 m arc.

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Reference Photos

Built & Operated Offshore

Reference imagery showing typical vertical lay systems (vls) configurations and offshore deployment scenes.

200 MT VLS tower integrated on a Dimension cable-lay vessel — with carousel, jib crane and full lay-spread on deck

3D render — twin 100 MT four-track tensioners stacked across three deck elevations, integrated arc and top jib crane

Side elevation — 21.9 m to top deck, R 5000 mm arc, 8.5 m base; EL. 5.7 / 13.7 / 21.9 m operating decks

Front elevation — twin tensioner stack, full 21.9 m height, 8.0 m base

Reference photos are general industry illustrations of equipment of this type, used here for indicative purposes. Project-specific design renderings are provided as part of the formal engineering submission.

Specifications

Technical Data

Indicative configuration ranges. Final specification is project-dependent and confirmed during FEED.

Parameter	Value
Featured Build	200 MT Modular Twin-Tensioner Vertical Flexlay Tower
Total Line Pull	200 MT (twin tensioners summed)
Tensioner Configuration	Twin × 100 MT, four-track each, 5 m contact length
Tower Height	28 m (overall), 21.9 m to top deck
Arc Diameter	10.0 m (R 5000 mm)
Top Jib Crane	Integrated lifting jib above arc
Deck Elevations	EL. 5.7 m · EL. 13.7 m · EL. 21.9 m
Base Footprint	8.5 × 8.0 m approx.
Lay Depth	Up to 3,000 m
Configuration	Moonpool / stern / over-the-side
Hang-off System	Integrated, redundant
AHC Option	± 2.5 m, active heave compensation
Product Range	Submarine cables, umbilicals, flexibles
Lay Speed	0 – 0.8 m/s
Class	ABS / LRS (project-specific)
Operations	Up to Hs 4.5 m

Applications

Where It's Deployed

— 01

Deepwater flexible-pipe and umbilical installation

— 02

SURF (Subsea, Umbilicals, Risers, Flowlines)

— 03

Inter-array submarine cable lay for floating offshore wind

— 04

Subsea repair and re-lay missions

Vertical Lay Systems (VLS)