Replace Old Expansion Tank ?

Post by **franco b** » Wed. Oct. 02, 2013 11:24 am

Sting wrote:Its a shame how such a simple question can be convoluted by what some folks "think"

http://websupport.completewatersystems.com/entries/21710656

http://websupport.completewatersystems.com/entrie ... ic-Systems

It depends.

rberq · Post by **rberq** » Wed. Oct. 02, 2013 2:35 pm

kstills wrote:Any recommendations for a typical interval between draining the tank? Or does that depend entirely on the system?

With my old-style open-to-the-atmosphere expansion tank, I never ever drained it in 30+ years. As franco b said above, occasionally I had to add a little water if the tank level dropped, but those occasions were only every ten years or so.

Jeff1491 · Post by **Jeff1491** » Wed. Oct. 09, 2013 7:00 pm

I just drain mine once a year when I clean the rest or the system. Sometimes twice if I see the pressure getting closer to 20.
It it necessary to have an air scoop ? I don't have one on my system.

freetown fred · Post by **freetown fred** » Wed. Oct. 09, 2013 8:18 pm

Welcome to--"let's complicate the hell out of things-101" does your system work satisfactorily? What in God"s name is an air scoop--LOL

rberq · Post by **rberq** » Wed. Oct. 09, 2013 9:33 pm

freetown fred wrote:Welcome to--"let's complicate the hell out of things-101" does your system work satisfactorily? What in God"s name is an air scoop--LOL

I think an air scoop somehow removes air in the lines as the water circulates through the system. It is quite small, and I don't know the actual way it works, so I assume it is magic.

freetown fred · Post by **freetown fred** » Wed. Oct. 09, 2013 9:40 pm

Thanx rb magic damn well covers it for me

Mark (PA) · Post by **Mark (PA)** » Sun. Oct. 13, 2013 7:54 pm

if you REALLY want to understand hydronic heating spend a few dollars for this book. Or frankly any book by Mr Holohan on this topic. IE removal of Air mainly for this thread and where your pump / air scoop should be to reduce air and cavitation etc.

http://www.amazon.com/Pumping-away-options-hydron ... B0006PCBB0

I completely repiped my boilers (parallel, oil and coal) when I purchased my Coal boiler to accomplish this.

If you do it right you will never hear a pipe "bang" or rattle again... and yes that Air Scoop will help you accomplish this feat of Magic. Don't get me wrong you can do it any number of ways also and Old School is fine by me but if you are delving into it that would be the time to do it right.

CREDIT for this advice goes to member STING who I actually started speaking about heating with when I used to burn Corn on a completely different website for heat about 7 years ago or so. (We both migrated here for fun also I guess) ... another topic entirely though!

Fred - air Scoop for you buddy!

http://www.taco-hvac.com/uploads/FileLibrary/AirE ... nation.pdf