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Deck reel hub flange facing for offshore pipelay vessel - Vietnam

4 x 2.3m flanges – Triyard shipyard

Having successfully completed in-situ machining for a large 4.7 meter diameter stern thruster flange earlier in the newbuild project, Goltens was asked to deploy its in-situ specialists once again in June 2013.

The follow on work involved the machining of two upper and two lower Deck Reel Hub flanges on the offshore pipelay vessel Lewek Constellation which was being built by Saigon Offshore Fabrication & Engineering Ltd (SOFEL).

Goltens deployed in-situ machinists and one of its 3 meter flange facing machines to start the work.

  • Lewek Constellation

    Lewek Constellation

  • Checking Flange facer alignment

    Checking Flange facer alignment

  • Flange facing of lower flange

    Flange facing of lower flange

  • Lower Reel Hub flange surface

    Lower Reel Hub flange surface

  • Flange facing lower flange

    Flange facing lower flange

  • Machining upper reel hub flange

    Machining upper reel hub flange

  • Machining upper reel hub flange

    Machining upper reel hub flange


Customer: TriYard Shipyard Vung Tau
Project name: 1200MT 16M Deck Reel
Vessel: Lewek Constellation
Top Flange dimension: OD2300 x ID2120 x 2 pcs
Bottom Flange Dimension: OD2300 x ID2060 x 2 pcs
Class Surveyor: ABS
Work period: 25 days


  • Setting up the machine to follow up the reference point provided by Shipyard.
  • Flatness checks to monitor and report material removal to the yard.
  • Machining of the top and bottom flanges to match the drawing specifications:
    Top: OD2300 x ID2120 x 2 pcs
    Bottom: OD2300 x ID2060 x 2 pcs
  • Removal of 30mm material from each flange
  • Completion of flatness checks of the finished flanges witnessed by class, owner and shipyard.


Goltens completed the macihining of the 4 flanges in a total of 24 days from start to finish. A total of 30mm of material was removed from each flange. The results of the machining were excellent and were accepted by Class surveyor (DNV), the vessel owner and the shipyard’s Quality Control.


“We are very satisfied with Goltens’ support, working attitude and excellent workmanship”

Mr. David Zhang
General Manager
TriYard SOFEL, Vung Tau

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