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Structural & Piping Stress Analysis for 6" Deluge Skid on Offshore AB Wellhead Platform - North Oil Company

Project Overview:

North Oil Company (NOC) awarded Tyco Qatar Fire and Security the contract to install a Deluge Skid package on the AB wellhead platform, part of the “AL SHAHEEN FIELD DBN PWM A and B locations Produced Water Management” project. Elixir Engineering conducted the Structural and Piping stability analysis to ensure operational safety and compliance

Scope of Work for Engineering Studies:

  • Piping Stress Analysis
  • Structural Design Calculations and GA Drawing Modifications

Execution Methodology:

  • Review and Data Collection:
    • Reviewed P&ID, preliminary GA drawing, tie-in schedule, and material specifications.
    • Verified GRE pipe and fitting properties from approved vendor data.
    • Prepared input sheet to collect connecting pipe nozzle loads within Skid battery limits.
    • Gathered data from connecting pipe isometrics up to the first anchor point.
  • Piping Modeling and Stress Analysis:
    • Modeled piping in CAESAR II software, defining fluid, material properties, and external load conditions (wind, wave, seismic) per project requirements.
    • Established support types, including specialized supports for GRE piping.
    • Conducted stress analysis for various load conditions (thermal, sustained, occasional, transport).
    • Validated pipe loads, deflection, and stress within allowable limits; optimized support if stress limits exceeded.
    • Compiled Stress and Restraint summaries, updating GA drawings with piping and support adjustments as necessary.
  • Structural Analysis:
    • Modeled structural members in STAAD Pro per GA drawing, incorporating piping loads (axial, vertical, friction) and external loads (wind, seismic).
    • Analyzed structural performance for deflection, torsion, and induced stress, and recommended modifications (e.g., bracing, wear plates) to enhance design life stability.
    • Conducted lifting lug, shackle, and anchor bolt calculations to ensure structural integrity.
  • Final Documentation and Updates:
    • Generated comprehensive reports with analysis summaries and software results.
    • Submitted updated GA drawings reflecting recommendations from the studies.

Deliverables:

  • Piping Stress Analysis Report
  • Structural Design Calculation Report
  • Piping Stress Isometric Drawings
  • Updated Structural and Piping GA Drawings with Recommendations

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