Pipeline, Riser & Subsea

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