Thank you for this feedback.

They are industrial facilites and thus, the industrial key should be used

All utility infrastructures are particular industrial facilities. I don’t contest the use of industrial key on those facilities (nor the use of building=industrial when applicable).
The point is to use both: industrial=* for the nature of infrastructure and utility=* for its activity.

the major oil & gas infrastructure facilities are not “utilities”/“utility-related”, they’re not directly for public service

Utilities usually refer to public services but it’s not mandatory. We have completely private companies without any public service mandate to operate.
Private/public criteria is addressed by operator:type=* key (or even operator=*)

We already use utility=* on oil&gas transmission pipeline markers.

The value of the industrial key usually shows wheather it’s about oil or gas anyway. Examples: gas_plant;tank_farm;gas_storage.

It’s kind of a problem to mix it in a single key. It’s not what we expect from industrial=* key.
Are we discussing about substance or utility here?

Substance isn’t suitable to deal with activity.

  • substance=steam, used with utility=chemical or utility=heating.
  • utility=heating using substance=steam or substance=hot_water…
  • utility=oil deals with many more substances=* than substance=oil only.

That’s why I find interesting the combination between industrial=, utility= substance=* or usage=*.