The LR Offshore Rules Support is a spreadsheet solution to assess whether individual scantlings comply with LR’s Offshore Rules. The spreadsheet has been thoroughly validated and is stable and accurate.


LR Offshore Rules Support checks compliance with the 2023 rules and all rule sets back to 2016.  The tool covers the following types of floating offshore structures:

  • New construction FPSO
  • FPSO conversion
  • FLNG

Offshore rules support


What does it do?

The following regions of the hull structure are included:

  1. Fore end
  2. Cargo hold region
  3. Machinery space
  4. Aft end

LR Offshore Rules Support covers Rule conditions for the following operational conditions: -

  • Normal on-site operation
  • Transit
  • Inspection/maintenance
  • Flooding 

What is the scope of the assessment?

Currently the tool only covers the following longitudinal structural elements:

  • Plate
  • Stiffener
  • Primary Structure Member (PSM)

The tool covers the assessments of:

  • Hull girder bending capacity
  • Ultimate strength
  • Direct shear flow
  • Hull girder shear capacity
  • Minimum thickness and section modulus
  • Required thickness corresponding to the Rule design pressure
  • Required section modulus and shear capacity corresponding to the Rule design pressure
  • Buckling assessment by LR Buckle Method
  • Bottom slamming and bow impact

A number of features have been incorporated into the software based on feedback from designers and builders, including:

  • Three different approaches for specifying the site‑specific loads (EFFs/DLCFs); (i) selecting standard Rule values, (ii) importing loads from ShipRight Offshore; and (iii) manual entry
  • Specify separate corrosion margins on webs and flanges of primary structural members
  • Standard stiffener library feature
  • Inclusion of Rule references and intermediate calculations to improve understanding of non‑compliances
  • Enhanced responsiveness through partial recalculation