Offshore platform topside being removed at sea by a heavy-lift vessel, grey North Sea
Project Delivery · Operations Advisory · Decommissioning · FPSO Life Extension

Decommissioning and FPSO life extension, delivered with execution certainty.

Independent project management, operations advisory and engineering delivery for offshore assets — from brownfield projects and late-life operations through decommissioning, FPSO life extension and construction management of major yard periods. The record behind the practice: 6M man-hours delivered LTI-free in nine months on the latest FPSO life extension, and a North Sea topsides decommissioning delivered 40% under sanction.

6M man-hours LTI-free FPSO · Fixed · Subsea Cessation → Removal → Recycling Independent assurance

Whole-life scope

Cessation of production through removal and green recycling.

Estimates that hold

Bottom-up, system-by-system decommissioning cost estimating.

Independent assurance

An objective view of readiness, risk and execution.

Execution-first

Engineering written for the field, not the shelf.

Capabilities

Specialist support for the hardest phases of an asset's life.

Projects, late-life operations, decommissioning and life extension are where cost, schedule and risk are won or lost. Crucial Engineering Contracting works across the full lifecycle — from strategy and estimating to execution and yard readiness.

Project planning table with printed programme schedule and engineering drawings
01

Project Management & Delivery

Multi-discipline project delivery from concept through execution — brownfield modifications, subsea tie-backs and live-asset campaigns, owned to budget and schedule.

  • Concept, FEED & execution phase management
  • Brownfield modifications & subsea tie-backs
  • Turnaround & SIMOPS campaign delivery
  • Cost, schedule, risk & contract ownership
Fabricated offshore topsides steel module standing in a fabrication yard
02

Construction Management & EPC Oversight

Managing EPC contractors and subcontractors through fabrication, construction, installation, completions and commissioning — most recently 6M man-hours LTI-free in nine months on a major FPSO life extension, ahead of baseline.

  • EPC contractor & subcontractor oversight
  • Completions, hook-up & commissioning
  • Constructability & engineering review
  • Subcontract technical & commercial evaluation
Offshore platform topside removed at sea by a heavy-lift vessel
03

Offshore Decommissioning

Execution-led decommissioning engineering and project management — from cessation of production through P&A interface, removals and disposal.

  • Decommissioning programme & execution strategy
  • Engineering management, ITR & punch-list assurance
  • Removals, SimOps & interface management
  • Regulatory & stakeholder engagement
FPSO floating production vessel offshore West Africa
04

FPSO Life Extension

Extending the safe, productive life of floating production assets — and getting them yard-ready for their next field.

  • Hull & topsides integrity and fatigue-life assessment
  • Life-extension scope definition & class compliance
  • Redeployment & conversion readiness
  • Steel renewal & structural reassessment planning
Ageing offshore production platform at dusk in late life
05

Late-Life & Cessation of Production

CoP timing decides the cost of everything that follows. Strategy for late-life operations and a controlled, well-timed cessation of production (CoP).

  • CoP strategy, timing & readiness
  • Late-life operating-cost control
  • Simultaneous CoP & portfolio management
  • Transition from production to decommissioning
Operations engineers inspecting pipework on an ageing production platform at dawn
06

Operations Advisory

Operator-side advisory on running assets hard in late life — operating cost, organisation, readiness and response, from people who have held the asset.

  • Operating-cost & organisational optimisation
  • Operational readiness & assurance reviews
  • Downman, remanning & crisis response
  • Contractor-led & duty-holder operating models
Decommissioning topside on the quayside, scope to be quantified and estimated
07

Decommissioning Cost Estimating

Decommissioning cost estimates built bottom-up, system by system, to withstand board, partner and regulator scrutiny.

  • Bottom-up, system-by-system estimating
  • Cost breakdown, phasing & estimating norms
  • ITT / tender development & evaluation
  • Benchmarking & estimate assurance
Pipe flange being bolted onto a ball valve on offshore process pipework
08

Engineering Down & Clean (EDC)

Engineering offshore facilities down to a safe, hydrocarbon-free, removal-ready state — the critical preparation phase before topsides come off.

  • Make-safe, isolation & de-energising
  • Cleaning, flushing & gas-freeing scope
  • NORM & hazardous-material handling
  • EDC scope, phasing & engineering norms
FPSO with a completed life-extension refit in a dry dock
09

Shipyard & Yard Readiness

De-risk the tow and the recycling phase with a scored, independent view of yard readiness and capability.

  • Yard characterisation & capability gap analysis
  • Shipyard readiness assessment
  • Cleanliness, NORM & gas-free planning
  • Quayside execution & long-lead procurement
Office desk with two monitors, screens off, in soft natural daylight
10

Software & Digital Tools

Bespoke software for project management and decommissioning — built by people who run the scopes it serves, not by a vendor guessing at them.

  • Decommissioning completions & assurance systems
  • Cost-estimating engines & norms libraries
  • Readiness assessment & reporting tools
  • Workflow tools for engineering & document control
Product DeCompletions

The completions and data-retention system for offshore decommissioning. One work breakdown structure for the whole scope, a verified audit trail, and handover packs at every interface — configured to the legislative framework you decommission under.

Visit decompletions.com

Something more specific?

Every late-life asset is different. If your challenge spans these areas — or sits between them — send a line.

Start a conversation
The Crucial difference

The late-life phase is where value leaks fastest. We make it the phase you control.

Decommissioning and life extension reward operators who plan early and execute with discipline. That is the entire focus of this practice — built on the front line of North Sea decommissioning and a West Africa FPSO life extension delivered at 6M man-hours LTI-free, ahead of baseline.

Execution-first

Engineering and estimates written to survive contact with the field, the weather window and the supply chain.

Lessons learned, applied

Hard-won governance and lessons from delivered programmes, fed forward so the next campaign doesn't repeat the last one's surprises.

Independent & objective

An outside view on scope, cost and readiness — assurance that decisions and tenders can stand on.

Estimates you can defend

Bottom-up, transparent and benchmarked. A North Sea topsides decommissioning was delivered 40% under sanction against numbers built this way.

About

An independent consultancy built on delivered programmes — a North Sea topsides decommissioning 40% under sanction; the latest FPSO life extension 6M man-hours LTI-free in nine months, ahead of baseline.

Crucial Engineering Contracting Limited provides project management, operations advisory and engineering management to operators and contractors across the asset lifecycle — brownfield delivery and late-life operations, cessation of production, decommissioning — including Engineering Down and Clean (EDC) — floating-production life extension and construction management of major yard periods — and develops bespoke project-management and decommissioning software, including DeCompletions, its completions and assurance system. The practice combines front-line execution experience with bottom-up estimating and independent assurance.

The result is a clear scope, a defensible cost and a schedule that holds — for clients across the North Sea, West Africa and the Middle East.

Ross CraigFounder & Principal Consultant

Have a project to deliver, a late-life asset to optimise, or a decommissioning scope to define?

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Contact

Tell us about your project.

Send a short note about your asset, scope or challenge and you'll get a considered reply — usually within one business day.

United Kingdom — serving clients worldwide
Confidential, conflict-free advice

This opens your email app with the message ready to send. Prefer to email directly? Write to ross@crucialengineering.uk.