qmdv wrote:Not sure where to start with AntiCub.
Things have changed in the petrolium business since high school. Ya think.
It was collage, and from the rest of your text, not that much really.
The tanks are vented but they are pressure vents cus all gas station now have a balanced system. In other words vapors no longe escape like before.
Didn't know this. That's one nice improvement. So what fills the void at the top of the tank as the level goes down? Since I haven't seen nitrogen bottles around gas stations, I'm guessing it's atmospheric air, with any moisture it contains.
The eth is added at the rack cus it cannot be shipped in the pipeline.
I'm curious, why not? Seems it would much simpler to blend the fuel in bulk before piping to an area it's mandated in.
I have built a few gas stations from the ground up and the fill sumps have sensors in them and if water comes in or fuel leaks into them the alarm goes off and basically you cannot pump gas tell things are back to normal.
That's a little different. The station I worked at only had them in the dispensing pumps. They shut the pumps down if it started sucking water out of the storage tank. The filling wells used to fill with water frequently in the spring.
Everything is double containment. You act like the gas stations are serving their product from an open bucket.
The double containment is to keep the fuel out of the ground, not to keep air out. (I've designed a few underground tank installations myself). Also, I know my airport has all it's fuel tanks above ground, where they're much more likely to get condensation in the tanks.
Also even in an open vented 182, you will not get a measurable amount of water vapor absorption, not even in Seattle.
So where does the water we get out of our sumps come from? Especially when the plane's been hangared so there's no chance for rain water incursion.
Not defending forced Eth but you are not getting water in your car gas.
Tim
Actually, that was part of my point too. The way fuel is used by cars is very different than for our aircraft. There's not much chance for auto fuel to get water contaminated becuase it's typically burned before it has the chance. Aircraft fuels generally spend a lot more time in storage, both before and after they're in our planes.
Don't get me wrong, I'm not saying we can never use ethanol in our aircraft. There are enough examples now that prove otherwise. Heck, the Japanese used it in their planes in WWII. But to think you can just treat it the same as regular old gasoline will bite you eventually.
Phil