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AHC Crane - Base Column Flange Repair, Slewing Bearing Overhaul & Crane Re-commissioning
 

The diving support vessel is equipped with a 50 ton Active Heave Compensation Offshore Crane, make Haean. During a routine Slewing Bearing Assessment carried out by certified Alatas Offshore crane engineers, large cracks were detected in the welding seams of the slewing bearing flange at the base column. The location and the depth of the cracks did not allow for in-situ repairs, but the entire base column had to be removed and shifted into Alatas workshop for the flange repair. This necessitated the removal of the crane and later re-installation and commissioning.

ALATAS provided project management, engineering, personnel, workshop facilities, and carried out following tasks on a turn-key basis:

Crane disassembly and removal of base column from vessel:

  • Lifting plans designed & calculated by ALATAS Lifting Technical Authority
  • Removal of crane knuckle boom, main boom and crane slewing chassis
  • Removal of base column and transport from Vessel to Alatas workshop

    Slewing column flange repair at Alatas workshop:

  • Drafting repair procedure, submission to class and obtaining class approval.
  • Supply of materials and fabricating new flange
  • Crop-off old, cracked flange and weld new flange
  • Drill stud holes
  • Carry out in-situ machining to achieve required flange flatness.
  • Establishing QC & NDT reports and class certification

    Slewing Bearing Inspection and overhaul at Alatas workshop:

  • Dismantle & inspect slewing bearing
  • Carry out crack testing on slewing bearing raceways
  • Supply new slewing bearing balls & distance elements and re-assemble slewing bearing

    Crane installation and commissioning:

  • Lifting plans designed & calculated by ALATAS Lifting Technical Authority
  • Install repaired base column back onto vessel
  • Install Slip ring unit into base column
  • Assemble crane on ground and prepare crane to be lifted as one, completely assembled unit.
  • Arrange shear leg crane and lift crane onto base column
  • Complete installation, wire rope reeving etc. and carry out crane function testing.
  • Carry out overload testing and issue test certificate.
  • Establish complete reporting package including class certification.

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    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

    HAEAN AHC Crane

    HAEAN AHC Crane

    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

    50T HAEAN AHC Crane

    Main Boom with AHC cylinder

    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

    Crane Capacity

    Crane Hydraulic Aggregate

    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

    Slewing Bearing Axial Clearance Measurement

    NDT Crack Testing Base Column Flange

    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

    Cracks Detected on Base Column Flange Weldments

    Lifting Off Main Boom

    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

    Lifting Off Main Boom

    Lifting Off Main Boom

    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

    Knuckle Boom Cylinder Pin Removal

    Knuckle Boom Cylinder Pin Removal

    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

    Knuckle Boom Removal

    Knuckle Boom Removal

    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

    Lifting of Machinery House

    Lifting of Machinery House

    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

    Pedestal Unit

    Removal of Pedestal Unit

    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

    Shifting of Pedestal Unit For Repair

    Main Boom Removed

    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

    Main Boom on Ground

    Pedestal in Alatas Workshop

    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

    Removing Slewing Bearing

    Inspection with ABS Surveyor

    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

    Fitting of New Flange

    New Flange Fitted

    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

    Top Flange Completed

    Slewing Bearing Dismantling

    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

    Slewing Bearing Dismantling image 1

    Slewing Bearing Dismantling image 2

    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

    Slewing Bearing Raceway

    Slewing Bearing Raceway Inspection

    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

    Slewing Bearing Raceway Crack Testing

    Slewing Bearing Raceway MPI Testing

    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

    Slewing Ring Disassembly

    Slewing Bearing Ball Spacer Inspection

    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

    Crane Installation (In One Piece Completely Assembled)

    Rigging the Boom

    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

    Knuckle Boom Installation

    Lifting of Pre-assembled Main Boom and Machine House

    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

    Load Test

    Shearleg Crane Moving Into Position

    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

    Completing Crane Installation

    Shifting Boom and Machine Room

    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

    Shifting Machine Room

    Shifting Machine Room to Installation Area

     

     

    Alatas Singapore - AHC Crane - Repair, overhaul and re-commissioning

     

    Final Load Testing Handover

     

     

     

     

     
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