The advantage of using the bottom outlet is to empty the tank. If you use the eduction pipe for off loading then there will be at least a couple of inches of product left in the tank as most eduction pipes are 2-21/2 inches off the bottom. The eduction pipe cannot go to the bottom of the tank as the diameter of the tank shell changes when the car is loaded and the pipe will make contact with the shell which in turn requires repair to the tank and or to the eduction pipe.
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--- In STMFC@yahoogroups.com, "gettheredesigns" <rick@...> wrote:
Seems to me that if they used the bottom outlet, they would have to open the dome anyway to let air in as the tank emptied. And unless the tank was up on a trestle or was draining into an underground tank, they'd still have to pump it. So why mess with uncapping the bottom outlet, hooking up a hose, and opening the valve, when it could all be done through the dome?
Peace, Rick Aylsworth
--- In STMFC@yahoogroups.com, "Jim Sabol" <jimsabol@> wrote:
I can only admire the ingenuity in engineering methods of heating and otherwise preparing the contents of a tank car for pressurized pumping of the material up and out of the dome. But why not let if flow by gravity and added pressure and/or heating if needed out of the bottom valve?. Why fight gravity at all, ingenious or not? Thank you in advance for informing me. Jim here.
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