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Horizon Gangway - Reliable Offshore Transfers

Gangway · Accommodation & Access Equipment

Class-certified type (DNV register) · technical data sheet not yet verified​​⁠⁠‍⁠​‌⁠​‌‍‌‌​‍⁠⁠‌‌

The Horizon is an active motion-compensated gangway system that maintains a stable transfer interface while the vessel moves, enabling personnel and cargo transfer across offshore wind, oil and gas, and offshore logistics operations.

Inspection

Common failures & inspection points

Inspection

Inspector Detail

Common issues

  • Hydraulic cylinder seal wear causing drift or jerky response in active motion compensation
  • Motion reference unit (MRU) drift causing lag between vessel motion and gangway compensation
  • Wear in the slew bearing/rotation gear from continuous compensation movement
  • Hydraulic hose and fitting leaks at high-cycle-count joints
  • Corrosion of structural steelwork and telescopic sections in the splash zone
  • Load cell/overload sensor drift affecting SWL trip accuracy
  • Control system/PLC faults causing loss of active compensation mode

Inspection checklist

  • Function-test active motion compensation in all axes before each transfer operation
  • Inspect hydraulic cylinders for external leakage and rod seal condition
  • Check structural welds and telescopic sections for corrosion and cracking
  • Verify load cell calibration against a known test weight
  • Test the emergency stop and manual lowering/retrieval systems
  • Check slew bearing bolts for torque and bearing play
  • Verify MRU alignment and calibration
  • Inspect walkway/handrail integrity and non-slip surface condition
  • Test backup power/hydraulic accumulator function for controlled retraction on power loss

Service intervals

Hydraulic oil sampling/analysistypically every 2,000-3,000 running hours or annually
Load test / SWL verificationtypically annual, per class and flag requirements
MRU/motion sensor calibration checktypically every 6-12 months
Hydraulic hose replacementcondition-based, typically 5-8 years or per maker schedule
Slew bearing/gear lubricationper maker's schedule, typically monthly to quarterly depending on duty

Typical intervals for this design class, not the manufacturer’s figures for your model. The manufacturer’s manual is binding.

Typical wear limits

Wire rope diameter reduction (if fitted)general marine practice is discard at roughly 7% diameter reduction from nominal, or per class wire rope inspection code - confirm against the maker/class rules
Hydraulic cylinder rod wear/scoringcondition-based - visible scoring generally requires seal replacement and rod inspection; confirm with the maker

Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.

Critical spares

  • Hydraulic cylinder seal kits
  • Main hydraulic pump/motor spares
  • Load cell/overload sensor unit
  • Motion reference unit or MRU spares kit
  • Pre-made hydraulic hoses
  • Slew bearing seal kit
  • Control system fuses/relays/PLC modules per the maker's spares list

Safety

  • Personnel transfer equipment - any compensation or structural fault is a life-safety issue; do not use if the function test fails
  • Suspended/elevated load hazard - keep clear of the drop zone during operation
  • Hydraulic system stored pressure - isolate and depressurize before maintenance
  • Pinch points at telescoping and slewing joints
  • Crew must know the manual/emergency lowering procedure before every use, in case of power or hydraulic failure

Class survey

Personnel transfer/access equipment carrying a class notation typically requires annual load testing and function verification of the motion compensation and emergency lowering systems, plus a structural survey of the gangway and its shipboard foundation. Documentation of MRU calibration and load cell certification is generally expected at each survey.

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