Story #04 · Scan-to-Model
The clash that the model didn't catch
On a refinery revamp, I was designing a new 6-inch tie-in to an existing header. The as-built drawings showed a clear corridor. The 3D model, built from those drawings, confirmed it. Everything looked clean.
During the site survey, I found an 8-inch nitrogen line running exactly through my planned routing corridor. Not on any drawing. Added fifteen years earlier, never documented.
What it would have cost
Discovering this during construction, with the plant shut down for the tie-in window, means unplanned redesign at tens of thousands of dollars per hour of delay. The site survey took half a day. Cost: zero compared to the alternative.
The 3D model is only as good as the data it was built from. On brownfield projects, that data is almost always incomplete. The model is a hypothesis. The site is the truth. This is why laser scanning is transforming brownfield design — a point cloud captures what is actually there, not what someone thought was there fifteen years ago.
