crypto wrote:KJ4VOV wrote:I can't believe that no one here ever worked at or managed a gas station besides me...
Back in the 90's when I managed a station and 3 bay shop in NYC we had a hand pump for pumping water out of the bottom of the tanks. Very simple setup using a lever action hand pump attached to 12 feet of 3/4" copper tubing. Slip it down the tank fill and pump away.
(Note: just about all underground storage tanks will develop water in the bottom from condensation, and that water has to be pumped out when it reaches a certain depth)
Are all tanks less than 12 feet deep?
Whats at issue is the inability of a vacuum pump to lift liquids beyond 20 feet or so.
Yep, most are 12' or less, though I've seen a few bigger ones that were 20'. In many parts of the country you have to manually "stick" the tanks twice a day. Sticking the tanks means taking a 15' measuring stick, dropping it into the tank, pulling it back up and seeing how high the product level is on the stick, then writing that into the log. Yes, there's automatic systems that do this now, much more accurate than the stick, but in some places they still want stick readings for tax purposes.
And, I'd like to point out that even if the tank is 20' deep, unless you're trying to get the last dregs out of the bottom you'll never be lifting fuel that full 20'. You're only lifting it from the surface height of the product. So, if the tank is 10' high (plus 3' or so for the dirt and concrete over it) and half full, you're only lifting product about 8-9 feet.