On-site overhaul of azimuth thrusters at Turkish shipyard  

A global leader in Dredging & Marine solutions invited Stork Gears & Services to carry out an overhaul of three Azimuth thrusters of their fallpipe vessel.Inspection and Overhaul Azimuth Thrusters at fallpipe vessel

This offshore vessel deposits stone accurately at great depths servicing Oil & Gas industries. During dry docking in Turkey Stork Gears & Services visited the dynamically positioned fallpipe vessel (DPFPV) for an inspection.
The complete overhaul was executed in less than 4 weeks at the shipyard's workshop. 

On-site thruster overhaul - scope of work

Purpose of the visit was the overhaul of Aquamaster unit type UL 2001 / 6600. The overhaul included:

  • renewal of bearings and seals
  • renewal of inner lifting piston
  • renewal of propeller shaft
  • seal modification around lifting cylinder outboard side
  • adjustments of bearings
  • adjustment of gears

 An access was cut in the deck to enable the transport of the upper gearbox and slewing gear. Also the lower part and  steering tube where transported to shipyard's workshop. Oil was drained into 3 clean 1000 liter containers and reused. All renewals and adjustments of bearings were performed in shipyards workshop.

Seahorse Upper Gear in lower position
Upper gear in lower position

Seahorse Upper Gear in Top position
Upper gear in top position

View the photogallery below for an impression of this challenging project!          

Location Istanbul, Turkey
Market segment Shipping/ offshore
Dynamically positioned fallpipe vessel (DPFPV)
Equipment Azimuth thusters (3 x 1,000 kW)
Azimuthing retractable thrusters  Type UL 2001 / 6600 

About Azimuth thrusters

The basic idea behind an azimuth thruster is that the propeller can be rotated 360 degrees around the vertical axis, providing omni- directional thrust and offering excellent maneuverability.

About Fallpipe vessels

Fallpipe vessels are able to deposit stone accurately at great depths. The crew use a remote-controlled system to position the end of the fallpipe just a few metres over the placement level. Then the stone is fed through the fallpipe while the vessel moves over the destination area.This method is frequently used in the oil and gas industry for leveling the seabed for pipelines or to provide pipelines with a protective layer of stone.
Source: Boskalis

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