Dual Stove Pipe Questions

I have a large old chimney that is the chimney for my house's old cook fireplace. For efficieny purposes, I would like to do the following: I want to insert a dual flue stove pipe from the first floor at the top of the cook fireplace to the roof (two story house with attic). I would like to install a woodstove in the cook fireplace on the first floor and use the woodstove on the second floor accessing the second stove pipe (chimney already has an access hole on the second floor). The reason I want to run the double pipe all the way down to the first floor even though the second stove is on the second floor is that I think it will make cleaning the second pipe easier if I can access it from below. I would just need a T joint on the second floor for the exhaust from the second floor stove.
My questions:
1) Is this a feasible setup? 2) If yes, what sort of pipe do you use in a chimney like this? 3) Are there double pipes already joined like this? 4) Will there be any problem with back drafts from the second floor stove's smoke going up the pipe but then back down the other pipe when the first floor stove is not in use? 5) Would I need a "damper" (not sure if that is the right term for a pipe)for each pipe to prevent back drafts when one stove is not in use. 6) Can the stove pipe be "hung" from the top of the chimney with some sort of mount at the top of the chimney?
Thanks in advance for any information on these questions.
Rob
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I think so, but have a couple of questions. If i'm reading this right, you are running one stove on one pipe. The second pipe will run down to the first floor, but is closed off. There will be a cleanout to open when needed right?

Steel stove pipe is the most common, but depeding on the condition of the existing chimney, you may want to consider mulit-walled pipe. Talk to your local stove dealer.

Never saw them, but that does not mean they don't exist.

You meat crssing over at the top, outside the house? Unlikey, but anything is possible under the right circumstances. Dual chimneys are fairly common though.

If the stove is close up, a damper is not really needed. OTOH, it can be a good iea as downdrafts are farily common under the right conditions. Usually, it is just a disk in the pipe rotated by a handle outside the pipe.

I think you want something under it to hslp keep it in place. I'd not trust a hanger for that much pipe.
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Edwin Pawlowski wrote:

level as the other one, but only for purposes of access for cleaning it.

That is what I meant. I was just concerned because I get downward winds on the house from the nearby mountains...

Thanks for the feedback!
Rob
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