OPERATIONS & MAINTENANCE SECTION TITLE
Sulzer’s training for offshore projects
ensures its engineers can deliver repairs
quickly and efficiently
Bearing vibration in an offshore 4MW thruster motor fixed through innovative joint effort
arge marine thrusters are vital for the safe manoeuvring of vessels, but their location on board can make maintenance a considerable challenge. So, repairing a failed bearing and housing on an offshore accommodation vessel – as found in a recent case study –would require technical expertise as well as innovative and flexible repair procedures. Working in the North Sea oil fields, the conditions can be far from favourable, so a safe and pleasant living environment is essential to all offshore workers. Accommodation vessels are co-located
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BEARING
with drilling rigs to provide living and recreation facilities for the crew. Te semi-submersible accommodation
vessel is designed to house up to 450 personnel. It uses a dynamic positioning system, DP3 in this case, as well as a 12-point mooring arrangement to hold position at sea. Te thrusters are a vital part of the system and need to be maintained in perfect operational condition. Te primary maintenance contractor contacted Sulzer reporting high vibrations in one of the main thruster motors, which are located in the pontoons, after the OEM was unable to support the
maintenance request at short notice. Te project required the bearings to be inspected and replaced as necessary before recommissioning the thruster motor. Since this type of repair had never been carried out on this vessel, it was essential that Sulzer carefully surveyed the motor and its location before creating a risk assessment and method statement in line with the vessel’s operational guidelines. Te site survey also identified all the tooling and access equipment that would be required to complete the repairs. Te highly skilled site engineering team, based at Sulzer’s Aberdeen (Dyce)
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