Fleet of three OSVs

End-to-end Installation supervision for a fast class approval.

Engineering work → Class approval → Installation supervision

Telescopic access bridge (gangway) integration.

INDUSTRY

Offshore energy

vessels

3 OSVs

YEARS

2023

Capability

Deliver results under extreme schedule pressure

SOW

Engineering work, Class approval, Installation supervision

  • 3

    OSVs
    fleet

  • 91t

    gangway
    weight

  • 0

    class
    comments

  • 1

    point of contact for all phases

Client context

Our Client is a well renown offshore shipping company with 42 ships in their fleet and 2500 highly skilled employees worldwide.

Their vessels and expertise provide their partners in the offshore energy industry with the operational power, safety and reliability they need to grow everything but their environmental impact.

As one of the earliest adopters of green initiatives, our Client’s ambition is to reach their targets of zero emissions and zero incidents.

The Problem

Our Client is one of the first offshore operators to support the growth of the Offshore Wind sector, thus their current need to equip 3 (three) of their OSVs with telescopic access bridge (TAB) gangways.

The scope of work consisted in identifying the stress levels transmitted by the newly installed telescopic access bridge into the existing hull structure, on the connecting brackets and through compression into the deck stoppers.

In cases where the resulted tensions were close to the material limit, the scope of work was extended to mitigating the stress levels by providing sufficient reinforcements and obtaining final Class approval to enable installations.

BRIEF

The work to be done

project phases

  • FEA assessment of gangway foundation;
  • Proposal of local reinforcements (if applicable);
  • Development of calculation report documenting the FE Analysis;
  • Development of technical drawing for class approval;
  • Interaction with Class for final approval.

PROJECT SOLUTION

Involvement of GLOMARINE throughout the project stages

01

Engineering work

Our structural analysis team used rigid elements connected to the equipment foundation to apply the equivalent forces and moments in order to assess their effect on the connecting brackets, stoppers, and the main deck structure. As a very conservative assumption, all extreme values were considered simultaneously applied on the model. The computed yield utilisation factor for plates and for stiffeners was lower than the permissible factor of 0.8.

Given the low levels of calculated stress and considering the urgency of this gangway installation, no further analysis using a finer mesh model was considered necessary.

Once the structural analysis was completed, the results were handed over to our design team which translated the information into a structural drawing for Class Approval.

02

Class approval

Our Project Manager has then submitted the technical drawing to DNV for final approval, which returned stamped approval without comments. This swift collaboration between disciplines, given the urgency of these three different installations, proves once more the importance of coordinating all activities under one roof.

03

Installation supervision

A GLO Marine surveyor has attended the gangway installation in the shipyard to ensure that all structural modifications were carried out as per the DNV approved drawings and within the designated installation window.

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End of delivery

The outcomes

Final results

  • Three different gangway integrations analysed and Class approved in record time;
  • Swift collaboration between disciplines allowed faster project delivery;
  • Successful installation within the designated window achieved.

Our client has reached their very ambitious goal to equip their fleet of three OSVs with telescopic access bridge gangways and enhance their involvement in the Offshore Wind industry. They have expressed their extreme satisfaction towards GLO Marine’s technical expertise, as well as GLO Marine’s capability to deliver results under extreme schedule pressure

The existing collaboration will expand to other offshore mobilisation projects such as equipment integrations and addition of new Class notations.

Testimonials

In our client’s words

”The cooperation is definitely valuable for us. […]The cooperation with you allows us to be able to deliver smooth and fast."

Client

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