As-Built Engineering

Loop Drawing Reconstruction

Q: Can you do partial scope (only critical units)?

Yes · we routinely deliver unit-by-unit. Most clients start with their highest-risk unit (Crude Distillation, Hydrocracker, FCC) and roll out.

Q: How do P&IDs link to HAZOP?

Directly · the HAZOP node structure should derive from P&ID boundaries. Updated P&IDs trigger HAZOP refresh on the changed nodes only · ~30% of the HAZOP cost of starting fresh.

Q: Do you integrate with our MOC process going forward?

Yes · we deliver a P&ID-MOC integration protocol so future modifications flow into the P&IDs in real time, not on annual cleanup cycle. Critical for keeping the foundation accurate.

Process flow diagrams verified against LiDAR scan and field reality.

Your P&IDs are 15 years out of date. Half the modifications were redlined on paper that's now lost. We rebuild them from LiDAR + field verification + DCS extraction · delivered in SmartPlant, AVEVA P&ID, or AutoCAD Plant 3D native format, ready for your next turnaround.

Why this matters

Why 90% of brownfield P&IDs are wrong, and what that costs

Every brownfield plant has the same problem · the P&IDs in the engineering vault are not the P&IDs that reflect the plant. Over years, modifications get made under MOC, redlined on print copies, sometimes formalised, often not. The result: 60-90% of P&IDs have errors. Turnaround planning, HAZOP, SIL, and digital twin programmes all inherit the errors. We rebuild P&IDs to match field reality · LiDAR-verified piping connectivity, field-verified instrumentation, DCS-extracted control loops. The output is ISA S5.1 + IEC 60848 compliant, sign-off ready, and the foundation for everything downstream.

Method

How we deliver Loop Drawing Reconstruction

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

Source consolidation

Existing P&ID set + plot plan + DCS / SCADA exports + LiDAR scan all loaded. Discrepancies pre-flagged for field check.

Field verification walkdown

Engineer-led walkdown verifying line connectivity, equipment present, instrumentation tag, control loop assignment. Marked up on consolidated source.

P&ID rebuild

P&IDs redrawn in SmartPlant (Intergraph / Hexagon), AVEVA P&ID, AutoCAD Plant 3D, or Bentley OpenPlant. Symbology per ISA S5.1 + your site standard.

Sign-off review

Internal QC + cross-check against HAZOP nodes + handover review with your operations + maintenance team.

Native handover

Delivered in your native format · SmartPlant, AVEVA, AutoCAD Plant 3D, IFC. Output also includes a CSV line list, equipment list, and instrument index.

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).

ISA S5.1 · Instrumentation Symbols and Identification
ISA S5.2 · Binary Logic Diagrams for Process Operations
IEC 60848 · GRAFCET specification language for sequential function charts
ISO 10628 · Diagrams for the chemical and petrochemical industry
API 614 (general purpose lube oil systems) · embedded P&ID conventions

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 · turnaround prep

Updated 1,400 P&IDs in 16 weeks pre-turnaround. HAZOP refresh ran on verified P&IDs · 8 high-severity findings closed before TAR start.

Pharma, USA · GMP validation

Cleanroom + utility P&IDs rebuilt for FDA pre-approval inspection. Validated as-built documentation chain.

Petrochem, Singapore · digital twin foundation

P&ID as-built layer for digital twin. Native AVEVA P&ID handover with 100% link to physical asset register.

Frequently asked