Experience

Hydraulic retrofit for aft starboard capstan on diving support / well intervention vessel

Retrofitting new hydraulic equipment to the system provided a cost-effective solution

Benefits

  • Redundant / obsolete equipment removed from the system
  • Cost-effective solution
  • Reduced down-time with work completed in-between port calls
  • More efficient than replacing the entire system.

Challenge

  • The client came to us with a work scope for a hydraulic retrofit as we've completed a variety of hydraulic activity for them over the past 10 years
  • The anchor winch / capstan systems use a common hydraulic power unit (HPU). With the anchor winch decommissioned, a large part of the hydraulic system was redundant. All redundant hydraulic components were to be removed
  • Due to the age of the system (mid 1980s), a large part of the hydraulic system was obsolete
  • Budget constraints due to market conditions.

Solution

  • During a scheduled vessel stop in Aberdeen Harbour, we mobilised a hydraulic supervisor to survey the system with a view to; confirming the as-built status of the hydraulic system and witness function testing of the capstans to fault-find the reported historical operational issues
  • On completion of the survey, a hydraulic review of the system was carried out to determine which components required replacement due to obsolescence / performance issues (or both) and which components required removal due to being redundant (part of the anchor winch system). The following scope of work was recommended to the client:
    • Replace pbsolete A4V250 pump with modern equivalent A4VG250
    • Due to differences between the A4V250 and A4VG250 pump A&B port interface, a custom manifold was to be designed and manufactured to re-use the existing hot oil strip manifold (close-coupled to the pump)
    • Replace cartridge valves in the hot oil strip manifold
    • Due to differences between the A4V250 and A4VG250 pump, retrofit new external boost filter
    • Remove the hydraulic control / brake release manifolds and send to our Aberdeen workshops for strip down, inspection, clean-up, replacement of valves / blank-off redundant and testing
    • Replace obsolete 4TH8 hydraulic joystick with modern equivalent 4TH6
    • Replace obsolete 4WEH32...NZ5L DCV with modern equivalent 4WEH32 DCV with NG32 blanking plate
    • Replace obsolete Viking MK63-16300 motor with modern equivalent MK64-16300
  • On agreeing the scope of work with the client, all parts were ordered and kept in stock ready for destruct / installation to commence during the next scheduled vessel stop in Aberdeen
  • Revised hydraulic schematic and parts list completed
  • Destruct, installation and commissioning procedures completed
  • Working together with the vessel crew, the retrofit was completed in two phases in-between port calls:
    • Destruct / installation
    • Commissioning

Summary

Integrated solutions

  • Fault finding and repair
  • Hydraulic system management

Capabilities / services

  • Multi-discipline engineering / design
  • Maintenance / servicing / refurbishment
  • Inspection / testing / rope access
  • Fluid power / hydraulics
  • Site surveys
  • Training / coaching

Equipment rental

  • Rigging / lifting equipment
  • Mechanical handling equipment
  • Spare parts / components.

Download case study

Hydraulic retrofit for aft starboard capstan on diving support / well intervention vessel

Download pdf options:
More Offshore Energy Case Studies

This site uses cookies. They let you easily navigate your way around the site and allow us to improve its performance. By continuing to browse the site you are agreeing to our use of cookies. Learn more about how we use cookies.