Case studies

Refurbishment of two PCM 120 AS cranes

Complete crane refurbishment ensures the reliability and integrity of your equipment without the need for expensive OEM support.

 

Asset:

Jack-up drilling rig

Location:

Abu Dhabi

Date:

2015
 

 


 

Challenge/objectives

While in dry dock our customer’s rig required refurbishment of its two PCM Marathon Le Tourneau 120 AS cranes.

Due to our extensive experience in major crane refurbishments they requested that we submitted a bid for the work and we were awarded the contract.

The project had to be completed in a tight time scale to fit in with the Rig Assets Integration Plan (RAIP) while it was in dry dock.

The scope included complete refurbishment of both cranes along with additional modifications (aux hoist bracket installation on the boom) and the delivery of an extensive quality dossier.

 


 

Solution applied

  • Both cranes were removed from the rig at Dubai Drydocks World and transferred to Sparrows’ facility in Abu Dhabi by road.
  • An inspection test plan was issued to the customer for the various activities involved in the refurbishment of all the sub-assemblies of the crane.
  • We completed the strip down of the cranes into elementary components such as four electrical motors, two motor generator sets, four gear boxes, crane wiring, winch drum and drive shaft, and swing rollers.
  • NDT inspections were carried out on the machinery house, king post seating area and the king post cap components.
  • We supplied and installed new complete rewiring kits consisting of control boards, new cables, contractors and circuit breakers.
  • From the two crane booms one was rejected for refurbishment due to extensive corrosion on the main chords and other required a modification for the installation of an auxiliary hoist gear box and motor assembly and aux hoist sheave brackets.
  • A replacement boom assembly was then supplied by the customer and this was inspected, refurbished and installed in addition to the original scope of inspection.
  • Sourcing spares parts was a challenge as the crane OEM no longer supported the product but we were able to source all spares parts in Abu Dhabi.

 


 

Summary of services/equipment deployed

  • EDisassembly and inspection of complete crane
  • Fabrication and delivery of new crane cabin
  • Supply of complete bearings kit and seal kit for gear boxes and winch drums
  • Supply of slew pinion shaft
  • Supply of a frame pin assembly
  • Supply of king post liners and boom mounting liners
  • Supply of load link plates
  • Supply and installation of new crane wire ropes (main, boom, aux) and boom pendant ropes
  • Supply and install of new swing rollers
  • Refurbishment of motor generator sets and motors
  • Refurbishment and calibration of existing PAT Kruger load indicating system

 


 

Outcome/benefits

The solution applied by the Sparrows Group provides a number of benefits:

  • Multi-skilled offshore personnel for fault finding
  • Fast response time to minimise disruption
  • Onshore engineering support to reduce offshore costs
  • Technical support regardless of OEM

 


 

Resources

 

pdf icon  Refurbishment of 2 PCM 120 AS cranes

 

 

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