Brownfield Modifications Support

Solutions > Home > Brownfield Modifications Support

Controlled change in live assets

When existing assets must be altered

Brownfield modification involves introducing physical change into assets that are already operational. Space is constrained, systems are live, and historical conditions are not always fully understood. Unlike new-build work, any intervention must be carefully developed to avoid disruption, rework, or escalation once execution begins.

This solution supports teams responsible for managing change within existing assets. Phase provides disciplined support to ensure modifications are grounded in verified conditions, aligned with operator requirements, and developed in a controlled manner before work proceeds.

The Challenge

Brownfield work is shaped by what already exists. Legacy installations, limited access, and undocumented conditions can complicate even relatively small changes. Decisions are often taken under time pressure while operations continue around the work.

Offshore, deterioration or ageing infrastructure frequently drives repair or replacement. Onshore facilities are more commonly modified to improve access, accommodate new equipment, or support system upgrades. In all cases, physical change must be introduced without creating new risks, delays, or unintended consequences during execution

Condition & Constraint Review

Modification Definition

Design Development

Interface & Access Consideration

Fabrication Continuity Support

What this solution supports

Brownfield Modification Support is applied where physical change is required within a live environment, including:

Condition-driven repairs and replacements — structural, piping, and access infrastructure”
Survey of new route corridors for piping, cable, or access systems before design proceeds
System upgrades, rerouting, and new tie-ins within existing plant and infrastructure
Introduction of access platforms, handrails, grating, and secondary structures within existing constrained environments
Where required, engineering responses developed to support the modification — including layout, structural, and fabrication detailing
Coordination of manufacture through approved third-party fabricators, aligned with issued drawings and operator requirements
Modifications developed under operator governance and approval processes

This solution supports operator-led change. It does not replace asset ownership, approval authority, or execution responsibility. Engineering responses are developed in support of the project — responsibility for design authority and regulatory compliance remains with the operator and their appointed duty holders.

Brownfield Support in Practice

The examples below illustrate how brownfield modifications are typically supported in practice. Each reflects controlled development of physical change within live assets, informed by verified conditions and progressed in line with operator requirements.

Established Asset Conditions

Key areas verified to provide reliable inputs for modification development.

Modification Design Development

Discrete changes developed within operator standards and approval processes.

Access and Secondary Structures

Platforms and access arrangements configured to suit congested operational spaces.

System Changes and Tie-Ins

Physical feasibility of new or modified services considered within existing assets.

Fabrication Continuity

Support provided to maintain alignment between approved designs and fabricated components.

The Outcome

Brownfield changes progress with clarity and control. Existing conditions, interfaces, and constraints are understood before work begins, reducing reliance on assumption and limiting late-stage adjustment.

Teams benefit from continuity between verification, engineering response, and fabrication support. This helps ensure modifications are introduced as intended, within operational, safety, and governance boundaries.

Phase operates from Aberdeen, supporting brownfield modification across offshore platforms, onshore industrial facilities, and infrastructure throughout Scotland and the UK

Discuss the modification

If change is required within an operational asset, early support can help maintain control and avoid unnecessary escalation.