Sector 04
Subsea Pipelines, Cables & SURF
Subsea field development — pipelines, risers, umbilicals and power cables, from design to installed system. Route engineering, on-bottom stability, HDD shore crossings, and transportation and installation engineering to DNV-ST-F101, ASME, and PD 8010.
Capabilities
Pipeline & Riser Design
- Wall thickness design — burst, collapse, combined loading (ULS)
- On-bottom stability — DNV-RP-F109, submerged weight design
- Upheaval and lateral buckling — VAS spacing, snake-lay, DNV-RP-F110
- Free-span analysis and VIV fatigue — DNV-RP-F105
- SCR and flexible riser design — OrcaFlex, DNV-ST-F201 / API RP 17B
Cables, Umbilicals & Shore Crossings
- Power cable and umbilical on-bottom stability — and cable protection engineering
- Inter-array and export cable route engineering
- Shore approach and HDD crossing design — ASTM F1962, drill path, pullback load
- Cable burial and rock-dumping engineering
Installation & Pre-commissioning
- S-lay and J-lay installation analysis — OrcaFlex
- Towed and pulled pipeline installation — bottom-pull, reel-lay
- Transportation and installation (T&I) engineering — MWS packages
- Pre-commissioning — flooding, gauging, hydrotest, dewatering
Assets we handle
Offshore PipelinesFlowlinesSCRsFlexible RisersUmbilicalsPower CablesPLEMs / PLETsHDD CrossingsShore ApproachesExpansion SpoolsJ-tubes / I-tubesCable Protection Systems
Active software
CAESAR II
OrcaFlex
AutoPIPE
OLGA
PIPESIM
OFFPIPE
PIPEPHASE
AVEVA E3D
AutoCAD
MATLABStandards & codes
DNV-ST-F101ASME B31.4ASME B31.8PD 8010DNV-RP-F105DNV-RP-F109DNV-RP-F110DNV-ST-F201API RP 17BASTM F1962
Services in this sector
Third-Party Verification & Independent Design ReviewIndependent verification of offshore structural, naval architecture and pipeline engineering: design reviews, re-analysis with our own models, structural integrity assessments and owner’s-engineer review of contractor deliverablesSubsea Pipeline DesignSubsea and nearshore pipeline design to DNV-ST-F101: route selection, wall thickness and material grade, on-bottom stability (DNV-RP-F109), free-span and VIV fatigue (DNV-RP-F105), expansion and lateral buckling, shore approaches and HDD crossings, and installation analysis for S-lay and J-layRiser & Conductor Installation EngineeringInstallation engineering for risers and conductors on fixed platforms: clamp and guide design, lift and running procedures, vessel interface, fatigue during installation and the MWS-ready calculation packageDecommissioning Engineering for Offshore PlatformsEngineering for the removal of ageing offshore platforms and pipelines: structural assessment of the as-is condition for cutting and lifting, reverse-installation and lift engineering, sea-fastening for the return transport, pipeline decommissioning options and the comparative assessment behind the decommissioning plan
Projects that prove it
Structural review — 5 jackets & topsidesIndependent review of structural deliverables for five offshore jackets and their topsides — design reports, calculations and drawings checked against applicable codes.Jacket face survey — 39 platformsStructural assessment of 39 jacket faces for riser and clamp installation — ONGC-approved hand sketches, drawings, and survey reports.Owner's advisory — vessel selection & PLB conversionStrategic advisory for purchase and conversion of a vessel to Pipe Lay Barge — vessel purchased at a reasonable negotiated price.Riser lifting feasibility — 30+ lifts assessedFeasibility assessment of riser installation across multiple candidate vessels — structural analysis and lift methodology for 30+ lifts assessed.Pipelay vessel upgrade — piggyback pipeline installationTwo-phase engineering to modify an operating pipelay vessel for piggyback pipeline installation — from technical feasibility and modification concept to detailed engineering.Riser installation — 4 platforms, 16 liftsCrane vessel installation engineering for risers across 4 offshore platforms — vessel selection, installation analysis, and methodology for 16 lifts.Conductor installation — Mumbai High, 120+ offshore daysSite supervision and project management for conductor installation at Mumbai High — 120+ offshore days, ONGC post-installation approval secured.