Service 05
Drawings and model updates for existing facilities, including replacement steelwork, equipment-support changes, structural interfaces and existing, removed and new work. Records are updated from authorised, verified field information.
Existing onshore and offshore facilities often need structural changes while relying on drawing records, survey information and models from earlier project stages.
We support agreed brownfield modification work by preparing existing-condition, removal and proposed-work drawings, replacement steel details, structural model updates, material schedules and final record-drawing updates based on approved engineering inputs.
Brownfield documentation depends on knowing the difference between documented, observed and approved conditions. We work from available record drawings and verified site information, identify discrepancies for client resolution, and clearly distinguish existing, removed and new work within the agreed drawing conventions. Structural integrity assessment, fitness-for-service decisions and engineering approval are separate responsibilities unless specifically resourced and contracted.
A brownfield structural modification package documents approved changes to an operating facility so they can be fabricated and installed safely around existing plant. It typically includes existing-condition, removal and proposed-work plans and sections, replacement and modification steel details, tie-in details to existing members, updated structural models, revised material take-offs and interface notes, and as-built record updates where contracted. The drawings clearly separate existing, removed and new work. Inputs are existing GA and as-built drawings or models, verified survey data, photographs and site mark-ups, any discrepancies register, the approved modification or repair design, and shutdown and tie-in constraints. The key discipline is distinguishing documented, observed and approved conditions: discrepancies between records and site information are identified for the client to resolve rather than assumed. Site verification, structural integrity assessment and fitness-for-service decisions are separate scopes, and modification drawings are not an integrity certification of the existing structure.
A packaged service for existing facilities. It brings drafting, modelling, steel, concrete and quantity deliverables together around one approved modification, so existing, removed and new work stay consistent across the package.
It sits downstream of the approved modification or repair design and of verified site information supplied by the client or responsible site engineer. Each component deliverable remains defined by its own service.
Discuss Your ScopeThe work that can be commissioned under this service. Any item can be scoped on its own or as part of a package; deliverables are agreed in writing for each project.
The work within this service, in the order it is usually produced. Any part can be scoped on its own; the deliverables for each package are agreed in writing.
Available approved record drawings, plant structural models, photographs, surveys and mark-ups examined; inconsistencies needing confirmation identified.
Retained, removed, modified and new elements differentiated on layouts and drawings as defined by the approved scope.
Engineer-approved member additions and replacements, bracing and plate alterations, and platform and access steel modifications documented.
Approved support moves, replacements, extensions and structural interfaces relevant to plant changes.
Modification and reinstatement documentation prepared from approved integrity or repair engineering decisions. The drawings are not an integrity certification.
Suitable CAD, Tekla or legacy models updated to reflect approved changes, keeping coordinates and revisions consistent.
Approved interfaces to retained works detailed, relevant field constraints identified and material updates prepared.
Validated final field mark-ups and client-authorised construction records incorporated. Unresolved assumptions remain flagged.
Structures this service regularly covers on energy and industrial projects. These are applications, not stages of the work.
What we work from
Each input is logged with its revision and status before production starts.
What you receive
Actual deliverables, formats and assumptions are negotiated and confirmed in the scope of work for each package.
Modifications follow the owner's facility specifications and the approved modification design. Offshore standards apply where the asset and contract require them.
The scope of work records the applicable standards and editions for each package. A reference to a standard does not imply design verification or certification.
How standards are appliedModifications follow the owner's facility specifications, existing drawing conventions and the approved modification design.
Legends, line styles and notes that distinguish retained, removed and new work are agreed before drawing starts.
Existing conditions are taken from verified information supplied by the client. Unverified assumptions are flagged, never presented as site fact.
Tie-in points, shutdown constraints and the issue sequence are recorded alongside the drawing and model revisions.
Examples a project may specify
Illustrative only, not a fixed or exhaustive list. The governing documents and editions are those named in your contract and project specification.
Navisworks model review supports interface checks against the existing plant model where one is provided.
Software listed reflects the senior team's project experience. Supported platforms, versions and file formats for a new package are confirmed during scope review.
File formats & workflowSteel Modelling & Detailing
3D structural steel models, general arrangement, shop and fabrication drawings, and model-derived MTO.
2D Drawing Production
Arrangement, detail, RCC and as-built drawings, and revision incorporation on existing drawing sets.
Model Review & Coordination
Model review, walkthrough and coordination checks against other disciplines.
The usual sequence for this service. Steps can overlap, and review comments loop back to earlier steps.
Drawings, models and registers gathered and their status confirmed.
Site data incorporated; discrepancies logged for client verification.
Modification or repair decisions confirmed by the responsible engineer.
Retained, removed and new work differentiated on the drawings.
Modification details produced and models updated.
Interfaces and MTO checked; package reviewed and issued.
Records updated from verified completion information.
Review & responsibility
Modification drawings are checked against the existing records, the verified site information and the approved modification basis, and interfaces to retained works are reviewed before issue. Discrepancies are recorded and returned to the client or responsible site engineer for verification rather than redrawn as fact. Final as-builts are updated only from verified completion records.
We document approved modification and repair decisions. Site verification, structural integrity assessment and fitness-for-service decisions are not carried out unless a distinct, qualified scope is contracted, and drawings prepared from approved repair engineering are not an integrity certification.
A brownfield package can include drafting, modelling, steel and RCC deliverables as components. Each remains defined by its own service. Work outside these limits can be discussed as a custom scope.
Excerpts from drawings produced by our senior team during previous professional engagements. They are confidential, so they are reduced, watermarked and shown without title blocks. Full drawings are for clients only.
Senior team experience
Rehabilitation and Integrity Reinstatement
Senior team experience on this rehabilitation and integrity reinstatement programme included structural checking, design and detail support, civil and steel structural drawings for structural modifications, MTO and model review in Navisworks.
Straight answers on how this service works. Scopes outside what is described here are reviewed case by case; we confirm we have the right competence before quoting.
Ask about your scopeThe discrepancy is recorded and the client or responsible site engineer is asked to verify it. It is not silently redrawn as fact.
Not as part of drafting or model updates. That requires a distinct, authorised structural engineering scope.
Yes, for a suitably scoped package with an approved design, site reference information, interfaces and the required issue and field conventions. Capacity for urgent or live-facility work is confirmed commercially.
Modification drawings distinguish existing, removed and new work with agreed legends, so site and fabrication teams can read the scope at a glance.
Have an existing pipe rack, platform or equipment-support modification? Send existing drawings, verified site data, approved modification information and the target issue sequence for scope review.