Hello everyone. I'm new here and have to say very nice site.
Im hoping I can have someone help out with plumbing my new hot water storage for my boiler system. I'm using a outdoor wood boiler to heat my water and I'm adding roughly 750 gallons of storage via 3 vertical propane tanks. My storage will be pressurized and heated through a plate heat exchanger. I have a rough drawing that I think may work but I would like input and advice from anyone willing to help out. My drawing is just basic showing circs. And flow right now, the final assembly will have all my valves and drains needed.
Here's my thinking
First I have the OPEN system OWB pushing water to my plate HX. This loop has the boiler protection valve on it.
Then from plate HX to my storage supply manifold. This manifold will be 1.5" pipe reducing at second tank to 1" then reducing again at third tank to 1/2". Correct me if I'm wrong but I think this is called reverse return parallel piping. The return line goes to the third tank at 1.5" then reduces to 1" at the second tank then again to 1/2" at the first tank. So that covers storage.
From my storage supply manifold I'll use a delta T pump to push water 90 feet through underground lines to the house to a manifold in the crawlspace made of 2.5" pipe. This manifold will have 4 ports and then the supply and return to storage. I'll tie into 1 port for my furnace HX then use another port back into the manifold with the return from HX. The 2 remaining ports will remain unused until I figure out what I want to do with my DHW. Then water returns from the manifold back to the storage tanks return piping.
Expansion is going in attic space in garage with fittings in the tops of all three tanks pitched to the final tank then a line ran up to the airtrol fitting. I was told I may not need an airtrol the way is draw but I'm not sure.
please any help would be greatly appreciated. Here's my drawing
[URL=http://s32.photobucket.com/user/warno_p/media/Mobile Uploads/20160310_210100_zpsypfhnukd.jpg.html][IMG]http://i32.photobucket.com/albums/d31/warno_p/Mobile Uploads/20160310_210100_zpsypfhnukd.jpg[/IMG][/URL]