Re:The Cost of Gasoline
by 13of40 on Sunday June 25, 2023 @06:41PM
(#36473404)
Above ground tanks also have the benefit of being gravity fed, so you can use them in rural areas without a power supply or complex pumping equipment.
[ Parent
| on HN ]
The tanks for fresh product (gas/diesel) which I saw had 220v electric pumps and were outside. Some had meters like a gas station to track usage to a machine. Fresh oil tanks were pneumatic. Used oil tanks were pumped out by the service truck. OSHA regulated.
Free-standing tanks for fresh product which are in rooms (drifts/bays) underground (mines) seem to be pneumatic with small tanks using a rotational hand pump simply because not a lot of whatever is being used. MSHA regulated. (Never call used oil "contaminated".)
Maybe farmers use gravity?
As an aside, I happened to recently see a setup 2/3 mile underground with two free-standing used oil tanks. One was marked "abandoned in place" because someone realized if both tanks fail when full, the retaining wall would not contain all of the used oil.