Discipline 03
Pipeline, Riser & Subsea
End-to-end engineering for subsea and onshore pipelines, risers, cables, umbilicals, and subsea structures — from route study and wall thickness design through installation analysis and life-of-field integrity management. Active on ONGC nearshore pipeline works, west coast LNG infrastructure, and offshore cable & umbilical projects.
Capabilities
Pipeline Design & Code Compliance
- Wall thickness — burst, collapse & combined loading (ULS), DNV-ST-F101
- On-bottom stability — DNV-RP-F109 (StableLines)
- Upheaval & lateral buckling — VAS, snake-lay (DNV-RP-F110)
- Free-span & VIV fatigue — DNV-RP-F105 (FatFree)
- Thermal expansion & effective axial force
- Route study, alignment sheets & design basis
- Material selection & linepipe specification — API 5L, NACE MR0175
- Cathodic protection — bracelet anodes (DNV-RP-F103)
Risers, Crossings & Subsea Structures
- Steel catenary riser (SCR) design — OrcaFlex, DNV-ST-F201
- Flexible riser analysis — VIV, fatigue (API RP 17B)
- PLEM / PLET structural design — mudmat, valve tree, tie-in
- Expansion spool & jumper design — metrology-based
- HDD & shore-approach crossing — ASTM F1962, HDD-GINA
- Pipeline & cable crossing design — over / under
- Crossing & proximity risk assessment (QRA)
- Topside & onshore piping design & stress — ASME B31.3 / B31.4 / B31.8
Transportation & Installation — Pipelines & Cables
- S-lay, J-lay & reel-lay installation analysis — OrcaFlex / OFFPIPE
- Pipeline abandonment & recovery (A&R) and shore pull-in
- Subsea cable & umbilical lay analysis — inter-array & export
- Cable protection system (CPS) design & pull-in
- Subsea structure installation — manifold / PLET lowering & protection
- On-bottom stability during installation — DNV-RP-0360
- Pre-commissioning — flooding, gauging, hydrotest, dewatering
Flow Assurance, Integrity & Life of Field
- Steady-state & transient hydraulic & thermal analysis — PIPESIM / OLGA
- Flow assurance & process design — slugging, hydrate, separation
- Wax / hydrate management & pigging strategy
- Internal corrosion assessment — CO₂ / H₂S modelling
- External coating & thermal insulation design
- Pipeline integrity management plan — DNV-RP-F116
- Life of field — flow enhancement, debottlenecking, operational support
- Repair, life extension & fitness-for-service — BS 7910; decommissioning
Assets we engineer
Subsea & onshore pipelines, flowlines & spoolsSteel catenary, flexible & rigid risersPLEMs, PLETs, manifolds & tie-in structuresSubsea power cables & umbilicals — inter-array & exportCable protection systems (CPS), J-tubes & I-tubesHDD crossings, shore approaches & pipeline / cable crossingsTopside & onshore piping systems
Active software
CAESAR II
AutoPIPE
OFFPIPE
OrcaFlex
OLGA
PIPESIMStableLinesFatFree
ABAQUS
PLAXIS
AVEVA E3D
AutoCAD (Plant 3D / Civil 3D)
MATLABStandards & codes
DNV-ST-F101 / F201ASME B31.3 / B31.4 / B31.8PD 8010DNV-RP-F105DNV-RP-F109DNV-RP-F110DNV-RP-F114DNV-RP-F103DNV-RP-F116DNV-RP-0360API 5L / RP 17BNACE MR0175ASTM F1962BS 7910
Services in this discipline
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 deliverablesFSRU & LNG Terminal Engineering with Cryogenic PipingEngineering for FSRU conversions and LNG import terminals: regasification and hull interface structure, jetty berthing and mooring analysis, cryogenic piping design and stress analysis to ASME B31.3, and class and IGC Code complianceSubsea 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 packageFEED & Detailed Engineering Support for EPC ContractorsEngineering-hour support for EPC, EPCI and fabrication contractors on offshore and marine projects: FEED deliverables, detailed structural, naval and pipeline engineering, 3D modelling in AVEVA E3D and SP3D, production drawings and class or certifier submissionsDecommissioning 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 planOffshore & Naval Architecture Engineering Outsourcing from IndiaA dedicated offshore engineering team in Mumbai for consultancies, EPC contractors, design houses and vessel owners in Europe, the Gulf and Asia-Pacific: naval architecture, offshore structural, pipeline and piping engineering delivered under your standards and software, at Indian engineering-hour rates, with a working day that overlaps the Gulf fully and Europe every afternoon.
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.OSV to WSV conversion — Norway, 200 MT steelDetailed engineering for OSV to Well Stimulation Vessel conversion — deckhouse structure, nesting plans, fabrication drawings, 200 MT+ steel engineered.Vessel pre-purchase survey & inspectionFull vessel condition assessment, thickness gauging, and engineering recommendations — vessel purchased at a 20% discount on asking price.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.