Subsea Software

Advanced Coupled Finite Element & Structural Reliability Analysis and Design Software for Subsea Pipelines

Subsea Software develop advanced coupled finite element (FE) and structural reliability analysis (SRA) codified design software for subsea pipelines.


Subsea Software calculations are verified against general purpose and bespoke subsea finite element software and NAFEMS bench marks.

Subsea Software’s SRA Pipeline Upheaval and SRA Lateral Buckling programs are validated against first principles, published examples and analytical techniques.

The Subsea Software element library includes bar, cable, beam, pipe, soil-structure and rigid elements.

For pipeline analyses the non-linear pipe elements are suitable for straight (2 nodes) and curved (3 and/or 4 nodes) pipelines. They include formulations for ovalisation and radial swelling/contraction. To conform with high temperature high pressure (HTHP) environments pipe elements include wall thickness shear deformation in all calculations. Pipeline elements are easily interfaced with the non-linear gap soil-structure elements.


Prediction of the reliability of structures using traditional SRA methods such as the Monte Carlo Simulation (MCS) or Latin Hypercube Simulation (LHS) require at a minimum several hundred thousand, usually time consuming, finite element (FE) analyses to be performed.

Using data analytical techniques Subsea Software have developed the Sigma-X Simulation (SXS) which calculates the reliability of structures for a given limit state within a given confidence interval using approximately a tenth of the FE analyses required for either the MCS or LHS methods.

For comparison with the SXS method both the MCS and LHS methods can be run in a reasonable time within a specified confidence interval using Subsea Software spawning functionality; i.e. copying to and running the Subsea Software SRA FE processor in parallel on several cloud based virtual machines.


All products within the Subsea Software suite are easy to use, intuitive, code of practise specific and robust. Structural analyses are performed using our bespoke subsea pipeline finite element solver, structural reliability is achieved by integrating the statistics program R into our program architecture whilst codified design is achieved using predefined but editable design code templates.

The architecture of the suite ensures that all models are design centric hence optimising the time to produce a design. The Subsea Software program architecture allows the engineer to design to the code of practise whilst making the relevant SRA and FE functionality available as required.

The Windows interface uses the attribute Define & Assign methodology together with entity associativity so that any model can be easily transformed to another simple or complex model. This increases engineering productivity, modularises all designs and makes the analysis and design process less prone to error.

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