Slewbearing Changeout – Jacking System Design

ALATAS’ SERVICEENGINEERING / PARTS SUPPLY / FIELD SERVICE
LOCATION  ASIA / MALAYSIA / OFFSHORE
EQUIPMENT  OFFSHORE PEDESTAL  CRANES / RAM LUFFING CRANE
BRAND / MODELSEACRANE K55-90

Introduction:

Alatas was entrusted with the task of designing a jacking system and executing the slewbearing replacement for the Seacrane on a fixed offshore asset in Malaysia. The original design did not specify jacking positions, necessitating the development of a custom jacking system. This involved an assessment and the design of local tie-in positions to successfully execute the scope. Alatas teams across the globe collaborated seamlessly to implement a full turnkey package, commencing with the initial survey conducted in Alatas Singapore, followed by the design engineering of the jacking system and structural tie-ins in Alatas UK, and concluding with the changeout implementation in Alatas Singapore.

Background:

Upon inspecting the slewbearing on the asset, it was discovered that the axial clearance measurement exceeded allowances. A prompt solution was imperative to replace the bearing efficiently.

Alatas’ Solution:

Alatas Singapore initiated an initial survey using a survey pack provided by Alatas UK to gather essential data for the engineering phase. The collected data underwent careful review, and the crane pedestal and chassis were meticulously modeled. A concept was generated to meet the requirements and fit the confined installation area. Calculations were performed, and detailed design progressed, ensuring all necessary design code validations for the structure and tie-ins were considered to ensure adequate safety factors for secure implementation.

Job Scope:

  • Survey requirements pack
  • Offshore survey and data gathering
  • Concept modeling from as-builts/survey data
  • Crane mass and center of gravity assessments with load distribution
  • Detailed design modeling, calculations, and analysis
  • Fabrication and arrangement drawings for designed steelwork
  • Third-party fabrication for steelwork
  • Work pack procedures and risk assessments for implementation
  • Supply of equipment, consumables, and personnel for framework installation and slew-bearing changeout
  • Full implementation of changeout and re-commissioning
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