From the question to a decision brief

Required end state

The module removed, retained interfaces left in the agreed condition, and material transferred to an identified receiving route.

Decision boundary

Preparation, temporary support, separation, lifting, transport and receiving conditions.

Before comparison

Agree the scope, exclusions and decision criteria with the asset owner.

Structure and inspection

What supports the module, which connections remain, and what has changed?

Weight and modifications

What is included in the weight and centre-of-gravity basis, including retained contents and temporary equipment?

Process and isolation

Where are the retained-system boundaries, and what preparation remains?

Transport and receiving

What constraints apply to load transfer, vessel or ground support, transport and acceptance ashore?

Illustrative open issue: the weight report and modification record do not reconcile. Record the competing information and define how it will be checked.

Option A / Remove as one unit

Review the installed, partly released, suspended and landed states, together with lifting and transport constraints.

Option B / Remove in engineered sections

Review additional preparation, temporary stability, access, handling and repeated transfer operations.

Neither approach is presented as feasible or preferred in this example.

Safety and temporary states

Load paths, restraint, access, exposure and the controls needed at each transition.

Technical feasibility

Condition, weight basis, lifting arrangements and transport or receiving limitations.

Environment and materials

Residual contents, waste classification, containment and receiving requirements.

Schedule and interfaces

Preparation duration, vessel or plant availability, handovers and dependencies.

Cost basis

Work quantities, method assumptions, commercial inputs and the effect of unresolved information.

Applicable requirements

The obligations, approvals and commitments relevant to the actual scope and jurisdiction.

If missing information could change whether an option is feasible, identify the verification required before recommending it.

Scope and options

Agreed boundaries, interfaces, options considered and screening reasons.

Decision basis

Evidence, assumptions and limitations supporting the comparison.

Open actions

Action owners, required evidence and the point at which each issue must be resolved.

Illustrative next step: resolve the weight discrepancy and review the temporary structural states before selecting a removal approach.

A decision brief supports the next review. It does not authorise the lifting or removal operation.

Required end state

The agreed plant removed, retained infrastructure protected, and the remaining site condition documented.

Decision boundary

Isolation, cleaning, access, temporary support, dismantling, handling and material transfer.

Before comparison

Agree the physical limits, operating interfaces and evidence required at handover.

Layout, structure and inspection

What remains supported or restrained as equipment is removed?

Process and service records

Which systems remain operational, and where are the agreed boundaries?

Materials and cleaning

What is known about residues and materials that affect preparation and handling?

Access, ground and receiving

What constraints apply to plant positions, handling routes and material acceptance?

Illustrative open issue: a service connection appears on one drawing but not another. Establish its identity and status before the affected scope is released.

Option A / Separate and lift selected equipment

Review weight, lifting access, structural connections, temporary support and landing arrangements.

Option B / Dismantle progressively within a defined area

Review the sequence, reach and access limits, intermediate stability, exclusion arrangements and segregation.

Method suitability remains subject to the actual configuration, condition and site constraints.

Safety and temporary states

Changing support and restraint, access, work exposure and effects on adjacent infrastructure.

Technical feasibility

Condition, geometry, plant access, lifting arrangements and ground or support limitations.

Environment and materials

Dust, noise, residues, segregation and receiving-facility requirements, as applicable.

Schedule and interfaces

Operating constraints, isolation releases, shared routes and material handling.

Cost basis

Preparation, access, temporary works, dismantling effort and material handling assumptions.

Applicable requirements

The obligations, permits and acceptance criteria relevant to the actual site and works.

A method should not rely on an unverified service boundary or structural condition.

Scope and approach

Retained-system boundaries, dismantling approaches and comparison basis.

Planning assumptions

Preparation, access and material-pathway assumptions.

Engineering and actions

Interfaces, proposed engineering tasks and evidence required before the affected work is released.

Illustrative next step: confirm the service boundary and current structural condition before developing the detailed dismantling sequence.

The example explains a study process. It is not a demolition plan or an instruction to carry out work.