Subsea engineering: moorings, risers and pipelines
Design, analysis and technical assurance for single point moorings, buoys, risers, hoses and subsea pipelines, modelled in OrcaFlex, OrcaLay and MOSES.
- 10subsea projects, each for a named client
- 3single point moorings analysed
- 1,500 mdeepest riser analysis, for ABAN Offshore
- 690 mof pipeline re-modelled for installation in Qatar
Subsea work delivered for
- IOC
- ONGC
- ESSAR
- HMEL
- ABAN Offshore
- L&T
- SESA
- Union Dredgers
Four kinds of subsea work
From the buoy on the surface to the pipeline on the seabed, analysed for the conditions it will really see.
Mooring and buoy systems
Design and analysis of mooring and buoy systems, from single point moorings to metocean buoys.
Risers and floating hoses
SPM and SBM riser and floating hose systems, and drillship riser stack-ups for new water depths.
Pipelines and installation
Technical assurance for subsea pipeline operations across the life of the system.
Subsea hardware
Design support for subsea hardware and ancillary equipment used in production and completion operations.
8 subsea projects, 8 clients
ONGC drillships Sagar Vijay and Sagar Bhushan
Checked whether ONGC's existing riser could work at 265 m water depth off India's east coast, and designed a feasible mooring configuration.
ABAN Abraham drillship riser stack-up
Designed a workable riser stack-up for 625 m water depth off India's east coast, also analysed at 1,500 m, including the effect of stronger currents.
IOC Paradip single point mooring
Modelled the Paradip CALM buoy system in OrcaFlex, matched to the SBM model, and assessed the extreme response of submarine hoses, floating hoses and mooring hawsers.
Five more, by the question each job answered
Recently installed subsea hoses failed. How should the new set go in?
What we didAn independent hose analysis, and a solution the owners could use to install new hoses.
OrcaFlexWhat sea states can a floating plant work in, and what if a mooring line breaks?
What we didAn optimised 8-point mooring for a 60 x 60 desalination semi-submersible: anchors, limiting sea states, operating, survival and line-break cases.
API RP 2SKCan an existing pipeline be installed with a new method?
What we did690 m of existing pipeline re-modelled for the new method, with installation, abandonment and recovery analysis.
InstallationDoes the hose system hold up on an SPM moving fluids of different densities?
What we didAn independent subsea hose analysis of the Vadinar single point mooring.
OrcaFlexWhich mooring buoy configurations meet ABS rules?
What we didDesign analysis of four configurations, covering anchors, buoys, chain, connecting hardware and hawsers.
ABS SPM rulesSend us the system and the problem
An engineer will tell you which analysis it needs and which standards apply.
Request a technical proposalFrom site data to a configuration you can install
- 1
Share the system and the site
Layout, vessel and hardware data, metocean data, and the operation you are planning.
- 2
Agree cases and criteria
Load cases, sea states and the standards that apply, such as API RP 2SK or API RP 16Q.
- 3
Build the model
An OrcaFlex or MOSES model of the vessel, lines, hoses or risers, checked against the manufacturer's data where it exists.
- 4
Analyse
Operating, extreme, survival and line-break cases, or the installation sequence step by step.
- 5
Report and recommend
Results, limiting conditions and a workable configuration you can take to the field.
The tools on these projects, and the rules they meet
Software
We also train engineers in OrcaFlex and MOSES. Follow a link to see the course.
Authorized Bentley partner. We supply and train on MOSES across India and the Middle East. About the partnership
Standards on recent projects
We work to the standard each job calls for.
- API RP 2SK
- API RP 16Q
- ABS rules for single point moorings
What terminal operators and drillers ask us
Which mooring and buoy systems do you design?
Single point moorings, CALM and SPAR buoys, spread and jetty mooring systems, external and internal turret moorings, mid-water arches and metocean buoys.
Which software do you use for subsea analysis?
OrcaFlex for moorings, risers and hoses, OrcaLay for pipeline installation, and MOSES.
Can you check whether an existing riser will work at a new water depth?
Yes. We checked ONGC's drillship riser at 265 m and designed a riser stack-up for ABAN Abraham at 625 m, also analysed at 1,500 m.
Do you carry out independent SPM hose analysis?
Yes. We have analysed the subsea hoses at HMEL's Mundra SPM after a failure, at ESSAR's Vadinar SPM, and the hoses and hawsers at IOC's Paradip SPM.
Which standards do you work to?
The ones each job calls for. Recent projects used API RP 2SK, API RP 16Q and ABS rules for single point moorings.
Do you cover pipeline installation and decommissioning?
Yes. We provide technical assurance for pre-service, installation and decommissioning, including installation, abandonment and recovery analysis at Halul Island, Qatar.
Planning a mooring, riser or pipeline job?
Send us the layout, the site data and what you need to know. An engineer will come back with questions and a scope.