Integration of vertical lay system for OSV

Design & Engineering for system integration

Feasability → Engineering → Class Approval

Integration of vertical lay system for Seven Oceanic




Major Offshore Operator



ship type


  • 20

    loading cases(Static and Dynamic)

  • 325t

    equipment weight

  • 100

    % Complete stakeholders management

  • 1

    Point of contact for all phases

Client context

Our Client is a well renown player in the development and
delivery of design and engineering solutions to the Maritime
and Offshore industries.

With a special interest in modifications and retrofit solutions
our Client focuses on energy efficiency and user-friendly
solutions that reduce maintenance costs and increase vessel

They operate on a global scale, with several specialised subsidiaries providing consistent and high-quality products and
services in all markets they serve

The Problem

Our Client is consistently supporting the large offshore operators with vessel modifications and upgrades. For the current scope of work the end beneficiary has identified an opportunity to install a 325t capacity Vertical Lay System (VLS) on board their Multi-Purpose Offshore Vessel.

The VLS will be positioned over the ship’s existing moonpool and modifications will need to be made to the ship’s local structure in order to provide suitable foundations for the equipment. Various items of associated equipment must also be secured on-board the vessel.​


The work to be done

project phases

  • lay ramp foundations ​
  • moonpool modifications​
  • carousel loading/laying hatch​
  • ancillary equipment foundations​
  • assessment of longitudinal strength​
  • statutory and layout drawings​
  • interaction with Class for final approval​
  • stakeholders management


Involvement of GLO MARINE throughout the project stages


Initial Survey and 3D Laser Scan

GLO site engineers boarded the vessel for the initial inspection, as well as to generate the 3D scan model of the project environment. The initial inspection concluded with the Survey Report detailing the current status of the vessel and a preliminary proposed arrangement to establish the correct way forward.​


Naval Architecture and Structural Engineering

Our structural analysis team have defined the loads to be applied by combining the local and global (HG) loads for sagging and hogging conditions, considering environmental of operational and survival conditions correspondingly.

The Lay Ramp was arranged with the firing line in the centre of the moonpool and with the main hinge pins located 1030 mm above the ship’s main deck. A range of static and dynamic load cases (up to 20 cases) covering both operating and “survival “conditions have been considered using reactions provided by the equipment designer.


Class approval 

This stage consisted in managing the interaction with Class for the duration of the project and developing the full set of drawings necessary for the approval process. The basic engineering drawings have been supported by detailed calculation reports, documenting the design assumptions, considerations, limitations, and applicable rules & regulations.​

During the Class approval stage, our team put a great emphasis on the communication flow between disciplines such as Electrical, Stability and Structural, to ensure that all inputs and outputs are circulated in a timely and concise manner. This eliminated all delays from the Class approval process, which was carried out with no major modifications.


End of delivery

The Outcomes

final results

  • VLS and auxiliary equipment successfully integrated on board
  • Swift collaboration between disciplines allowed for faster project delivery
  • All stakeholders (equipment manufacturer, Class, Client and shipyard) successfully managed

Our client has proceeded with the installation of the Vertical Lay System as originally scheduled, to the satisfaction of the end beneficiary. They have expressed their extreme satisfaction with GLO Marine’s technical expertise, as well as GLO Marine’s capability to successfully manage key stakeholders in large vessel upgrade projects.

GLO Marine’s success with large equipment integration proved crucial in extending this collaboration to future vessel upgrade projects related to wind propulsion systems.