Service

Life Extension & Structural Integrity Assessment

Structural integrity management and life-extension assessment for fixed platforms past their design life: survey data interpretation, corrosion and damage modelling, in-place, fatigue and pushover analysis for reserve strength, and a requalification statement to API RP 2A Section 17 / ISO 19902 Annex A. Our team surveyed and assessed 39 ONGC jacket structures.

What you receive

Survey scope definition and interpretation of UT, CVI, marine-growth and anode data
As-is structural model with corrosion, dents, cracks and missing members
In-place, spectral fatigue (DNV-RP-C203) and seismic (API RP 2EQ) re-analysis
Pushover analysis and reserve strength ratio; RSR-based acceptance
Requalification report to API RP 2A Section 17 / ISO 19902 Annex A with repair and inspection plan
Owner’s engineer support for the regulator or certifier review

Assessment, not re-design

An ageing platform will rarely pass a new-design check; it does not need to. The assessment route in API RP 2A Section 17 and ISO 19902 Annex A allows fitness for purpose to be demonstrated by ultimate-strength (pushover) analysis and a targeted inspection plan. We build the as-is model from the survey, run the linear checks to find what governs, then demonstrate reserve strength where it matters and recommend the smallest effective repair.

Track record

39 ONGC jacket structures surveyed and assessed in one campaign; a five-jacket-and-topside structural review; riser and conductor installation on producing platforms. Delivered from Mumbai with site surveys by our own engineers.

Codes & standards

API RP 2A Sec 17ISO 19902 Annex AAPI RP 2SIMDNV-RP-C203API RP 2EQNORSOK N-006

Software

SACSDNV SesamSTAAD.ProANSYSAbaqus

Assets

JacketsWellhead platformsProcess platformsBridges & flare towersRisers & conductors

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Jacket & topside design →

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Projects that prove it

Jacket face survey — 39 platformsStructural assessment of 39 jacket faces for riser and clamp installation — ONGC-approved hand sketches, drawings, and survey reports.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.Riser lifting feasibility — 30+ lifts assessedFeasibility assessment of riser installation across multiple candidate vessels — structural analysis and lift methodology for 30+ lifts assessed.

Related services

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 deliverables. Our team has reviewed five jackets and topsides for an operator and assessed 39 ONGC jacket structures, and supports jack-up site assessments in ONGC, ADNOC and Aramco fields.Jacket & Topside Structural DesignStructural design of fixed offshore platforms from FEED to fabrication drawings: jackets, wellhead and process decks, bridges, flare towers, helidecks and secondary steel, analysed for in-place, fatigue, seismic, transportation, launch and lift conditions to API RP 2A and ISO 19902, in SACS and Sesam. Delivered as engineering support to EPC contractors and as owner’s engineer for operators.Decommissioning 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. Built on the same survey and integrity work we deliver for life extension.

Regions we serve for this

Offshore, Marine & Pipeline Engineering in IndiaKannamwar Engineering is headquartered in Mumbai and delivers offshore structural, naval architecture and pipeline engineering to operators, EPC contractors and yards across India: ONGC’s western offshore fields, HPCL’s marine terminals, west-coast LNG infrastructure and the east-coast basins. 39 ONGC jacket structures assessed, riser and conductor installation campaigns engineered, and 120+ days of offshore site supervision at Mumbai High.Offshore Engineering Support for the Gulf: UAE, Saudi Arabia, Qatar, Oman, KuwaitEngineering support for EPC, T&I and fabrication contractors and jack-up operators working in the Arabian Gulf: jacket and topside engineering, sea-fastening and load-out packages, lifting engineering, jack-up site-specific assessment support and third-party design review, delivered from Mumbai in the same working day. Saudi Aramco and Lamprell are among our clients.Offshore & Marine Engineering Support for Nigeria and West AfricaEngineering support for vessel owners, installation contractors and terminal developers in Nigeria, Ghana, Angola and the wider Gulf of Guinea: vessel upgrades and deck-equipment installation, pipe-lay and installation engineering, class approval packages and design review. Our team has delivered a pipe-lay vessel piggyback pipeline upgrade and a four-davit installation on vessels operating in Nigeria.

Sectors

Offshore Oil & Gas

Disciplines

Offshore Structural Engineering

Frequently asked questions

Can a platform past its design life be kept in service?

Usually yes, through the assessment route in API RP 2A Section 17 / ISO 19902 Annex A: an as-is model from survey data, fatigue and pushover analysis to show reserve strength, and a targeted repair and inspection plan.