As-Built Engineering

General Arrangement (GA) Drawings

Plot plans and equipment layouts verified from LiDAR scan.

Plot plan, equipment elevation, section views, key plan · the GA drawing set is the spatial reference for everything that happens at your plant. We rebuild it from LiDAR to survey-grade accuracy · ready for retrofit planning, capex justification, evacuation drill prep, and digital twin foundation.

Why this matters

Why an accurate GA is the precondition for capex justification and emergency planning

The GA drawing set is your plant's spatial reference. When you're planning a new compressor installation, sizing crane lift paths, building evacuation drills, or briefing emergency responders · you need it accurate. Brownfield plants typically run on GA drawings 15-25 years old, missing every modification since. LiDAR rebuilds it accurately in weeks · the foundation for retrofit engineering, emergency response, and digital twin.

Method

How we deliver General Arrangement (GA) Drawings

CEng MIE India-signed deliverables · LiDAR-powered where applicable · digital twin handover ready · routes to the As-Built Engineering practice lead within 24 hours.

Coverage + plot plan

Scan coverage planned to capture full plot. Plot boundary, road network, building footprints, equipment plot reconciled with cadastre and your site map.

Equipment layout + elevation

Major equipment (vessels, towers, exchangers, compressors, pumps, motors, switchgear) located in plot coordinates + elevation.

Section views + key plan

Sectional cuts (north-south, east-west, custom) generated to scale. Key plan + access route + emergency egress drawn.

Drawing pack + native handover

Output in AutoCAD (DWG), Bentley MicroStation, IFC, or PDF. Linked to point cloud + asset register + P&ID.

Governance + sign-off

CEng MIE-signed. Updated on agreed cycle as plant changes via your MOC process.

Standards + compliance

Built to the standards your auditors quote

Reports reference the international and national standards your regulators, F500 audit teams, and corporate process safety leads cite. Every deliverable signed by a Chartered Engineer (CEng MIE India).

ASME Y14.1 · Engineering Drawing Practices
ISO 5455 · Technical drawings · Scales
API RP 752 · Building location / plot plan management
IS 696 / IS 15030 (India), AS 1100 (Australia) · drawing standards
NFPA 30 · Flammable and Combustible Liquids Code (plot plan distance requirements)

Anonymous case anchors

What this looks like in production

Three anonymised engagements from our verified roster · quantified outcomes, no client names disclosed without written permission.

Refinery, India · capex planning support

GA rebuilt as foundation for $40M new compressor installation. Plot plan revisions caught conflict with safe distance to flare.

Petrochem, KSA · emergency response upgrade

GA used for evacuation drill replanning. Identified 3 access routes blocked by recent piping additions.

Pharma, USA · cleanroom expansion planning

GA + section views + space envelope analysis for cleanroom expansion. Pre-empted structural conflict.

Frequently asked

General Arrangement (GA) Drawings · the practical questions

What's the difference between GA and plot plan?

Plot plan is the top view at site scale (1:500 to 1:2000) showing the whole plant. GA is the working drawing set · plot plan + equipment layout + sectional views + elevation + key plan.

Do you include underground utilities?

Above-ground LiDAR scan doesn't capture buried utilities. We can integrate ground-penetrating radar (GPR) survey for buried services as a separate scope, then overlay on the GA.

Can you do this for parts of the plant only?

Yes · we routinely do unit-by-unit. New project, retrofit unit, expansion plot · whatever needs GA-current is in scope, the rest can wait.

How does GA relate to plot plan compliance (NFPA 30, API 752)?

Critical. NFPA 30 sets minimum distances between tanks, between equipment and property line, between flammables and ignition sources. API 752 dictates building separation. Updated GA lets you audit compliance immediately.

Does the digital twin need GA, or just point cloud?

Both. Point cloud is the geometric foundation. GA is the engineering interpretation · scaled, labelled, sectioned. Both layers in Wistwin · point cloud for visualisation, GA for engineering reference.

Scope your General Arrangement (GA) Drawings engagement.

Tell us your plant, region, and scope · a named Chartered Engineer responds within 24 hours.

4 fields. No phone interview to start.
Per-discipline routing to the As-Built Engineering practice lead.
Anonymous case anchors sent with first reply.
Same-day callback for deadline-driven enquiries.

As-Built Engineering Scoping

P&ID + Iso + SLD + GA · LiDAR-powered · routes to As-Built Practice.