Skip to content

Umbilical analysis and flexible pipe analysis - Helica

Consistent, highly efficient and robust stress and fatigue analysis of umbilicals and flexible risers in subsea applications

Umbilical analysis and flexible pipe analysis software

The Helica software module in Sesam includes technology that represents industry consensus for cross section analysis of umbilicals and flexible risers, including fatigue analysis of section components such as helix wires and steel tubes. Using Helica, subsea engineers can reduce the analysis time to a fraction, as thousands of simulations may be performed in minutes.

Cross-section analysis and fatigue analysis of umbilicals

Helica is tailor-made software for cross-section analysis of flexible pipes and umbilicals and is validated against high quality stress measurements in a full-scale subsea umbilical.

The main functionalities of the Helica software are:

  • Cross-sectional load sharing analysis
  • Short-term fatigue analysis
  • Long-term fatigue analysis
  • Extreme analysis

Stresses in dynamic umbilicals and flexible pipes

Accurate evaluation of local stresses in complex cross-sections, e.g. of subsea umbilicals and flexible pipes, subjected to extreme and fatigue loading, is a challenge to the industry. Fatigue of cross-section components such as helix tensile armors and steel tubes is a critical design issue for dynamic umbilicals and flexible pipes.

The basis for assessment of fatigue damage of such elements is the long-term stress cycle distribution at critical locations on the helix elements caused by long-term environmental loading on the system. The long-term stress cycle distribution will therefore require global dynamic time domain analysis followed by a detailed cross-section analysis in a large number of irregular sea states.

Helica is a vital component in an overall computational consistent and highly efficient fatigue analysis scheme.

Key features of Helica software for umbilical analysis and flexible pipe analysis:

  • Load-sharing between elements
  • Calculation of cross-sectional stiffness properties
  • Evaluation of stick/slip behaviour due to interlayer frictional forces
  • Stresses in selected components due to combined bending and tensile loading
  • Assessment of capacity curves for combined bending and tensile loading of the cross section
  • Validation against high quality stress measurements in full-scale tests of umbilicals
  • Compatible with result files (time series) generated by global analysis software such as Orcaflex, Riflex and Flexcom

Learn more about Helica software

Have a look at our brochure, videos and other information

  Helica flier

Helica flier

Download a pdf

  Sesam for moorings and risers modules

Sesam for moorings and risers modules

Read more about the software modules

  Helica whitepaper

Helica whitepaper

Download a pdf



Riser analysis software for marine riser systems


Sesam Feature Description

Download the pdf for more details


Sesam for moorings and risers

Read more about the software


Watch the webinar:

How to perform efficient and reliable umbilical and flexible riser cross section analyses


Sesam Assistance

Are you using Sesam to its full potential?


Sesam Examples

Examples of use for the Sesam software suite

Find out more

Get in touch with us or sign up for events and training


Customer login

Get access to downloads, release notes and FAQs



Frequently asked questions - Sesam


Software events

Sign up for our events and seminars


Customer cases

Find out why industry leaders choose Sesam software


Sesam training

Training overview and registration

What can Helica software do for your company?

Request for demo