Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Built Environment (hierarchy name)
4. Single Built Works (hierarchy name)
5. single built works (built environment)
6. [single built works by specific type]
7. [single built works by function]
8. industrial structures
9. industrial buildings
10. factories (structures)
11. [factories by function]
12. processing plants

Narrower term/s

• oil refineries

Anotations

Scope note:

Buildings or other industrial installations where a material, such as sugar, oil, metal, etc., is refined, meaning it is purified, clarified, distilled, or otherwise treated, typically by a series of industrial processes, to make the material purer or of a finer quality.