Revamp

A revamp is brownfield with a thesis: the existing asset, bought and depreciated, can be made to do more for less than a new one would cost. Revamp engineering therefore starts where greenfield engineering ends — with what exists. The existing equipment is rated against the new conditions, item by item: which vessels, exchangers, machines and lines can take the new duty, which need modification, which must be replaced. The economics live in that sorting, because every reuse is capital avoided and every wrong reuse is a late, expensive discovery.

The inputs to that sorting are the facility's records — datasheets, as-builts, inspection histories — plus whatever surveys must fill their gaps, which makes documentation quality a direct driver of revamp cost and risk. The characteristic revamp failure is the reuse assumption that dies late: the exchanger that rating showed adequate until the actual fouling data surfaced, the foundation that could take the load until someone found the real drawings.

Execution then inherits the turnaround problem: the tie-ins and replacements that need the unit down get compressed into shutdown windows, and the revamp's schedule is ultimately negotiated with the production plan.