Engineering drawings, read as data.

Legend AI reads your P&IDs and PFDs, scanned or digital, and turns them into a process graph you can query. It runs on your own servers.

  • Sealed on-premise instance · no data leaves your site
  • Exports to DEXPI, XML, CSV and PNG
Hand-drawn hydraulic system schematic: the kind of engineering drawing Legend AI reads

Deployed in oil and gas

NGL and refining operator · Active, second contract

Read the case study
One QRA count
15 min
Previously 3 engineer-days
Tag reading accuracy
99.49%
Up from 77.76% after fine-tuning
Precision on isolation procedures
96.7%
Validated by the client's Loss Prevention team

How it works

From drawing to process graph.

Models trained on photographs fail on line drawings. Legend AI finds every symbol and line, reads the tags in your own conventions, and links each tag to what it names. The result is a graph of your plant.

  1. 01

    Detection

    Finds every symbol and line on the sheet.

  2. 02

    OCR

    Reads the tags in your own conventions.

  3. 03

    Association

    Links each tag to what it names.

  4. 04

    Process graph

    A graph of your plant you can query.

Pre-trained, then fine-tuned on your drawings.

In production, tag reading went from 77.76% to 99.49%. Every correction an engineer makes becomes training data.

What you get

Work that took weeks of tracing becomes a query.

Engineers review everything before it is used, and corrections re-run the affected results.

  • QRA counts

    Counted under your own counting rules.

  • Isolation procedures

    Generated from connectivity.

  • Process section boundaries

    Carried from PFDs into P&IDs.

Security

Nothing leaves your site.

  • A sealed instance in Docker on your own infrastructure.

  • No drawing, model or annotation leaves it.

  • Your engineers are trained on-site to run it.

Deployment

Audit to production.

  1. 1

    Audit

    2–4 weeks

  2. 2

    Configure

  3. 3

    Build and fine-tune

    8–24 weeks

  4. 4

    Operate

    Ongoing

Mission Dots

Bring us a drawing set.

We sign an NDA before any technical discussion and reply within 48 hours.

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