Latest Discussions : Plumbing

markat

04:10PM | 01/21/03
Member Since: 12/23/02
6 lifetime posts
we recently had a hot water tank expansion tank installed on the cold pipe coming into the hot water heater.
This expansion tank is mounted upside down, the print on the tank is upside down.
When i read the instructions that came with the expansion tank, it shows a picture to mount the tank right side up.
Does the mounting of the tank affect the operation of the expansion tank.
How do i know if the expansion tank is working ok.
How do i test the expansion tank

bobp

06:10PM | 01/21/03
Member Since: 01/13/03
50 lifetime posts
I had the same question on mine (plus I see this everywhere), so I contacted the manufacturer and they told me it really doesn't matter. The important things are the pressure (tested with a tire gauge on the end) and that it is located on the cold side (inlet) on the HW tank. The psi setting is on the tank, you fill it like a tire.

Bob

forcedj

05:02PM | 01/31/03
Member Since: 01/26/03
5 lifetime posts
In reference to checking the psi on the expansion tank: I recently moved into a 35 yr old house. Decided to check the tank's psi as mentioned. The label on the tank said fill to 15 psi and it was at 12. So, I added some air with the trusty bicycle pump. However, when I put the pressure gauge and pump connection onto the valve stem some very bad smelling brown water leaked out. I mean it smelled like a dead fish might be rotting inside there. What's causing that? Should I drain it completely and refill it?
Also, can someone tell me exactly what the differences (to high or to low) in pressure will result in.

jimtheplumber

09:01AM | 10/23/06
Member Since: 10/22/06
1 lifetime posts
The tank is divided with in. One part is pressurized air and the other is water. When mounted if the in coming part is facing down that is the best way to install. When water enters there may be sediment. With the inlet on the bottom the sediment can drain out. To test take a tire pressure gage and check the air pressure to he specs on the tank.Add if needed.

bowenguinan

02:05PM | 11/02/06
Member Since: 11/01/06
2 lifetime posts
Hi all, new to this site, but love it already.

In response to your excellent explanation on hydronic systems I'd like to pose a question.

Just moved into a 50 year old house. It seems to be a system pretty much like what you describe. However, I do not see a pressure guage on the expansion tank.

Here is my problem. The heating system works fine. There is no knocking or any other problems associated with air in the system.

However, the domestic hot water is a different matter. I can turn on a faucet (all hot) and watch it go from normal flow, to nearly a trickle, normal, trickle...etc.

Showering is NUTS! I turn it on, first comes out of the spiggot normal flow and temp, then turn on the shower head, slows to a COLD trickle for a few minutes, then surges up to normal temp and flow and then varies throughout the whole shower. It seems like something simple and I'd hate to have to spend a fortune if it's something I can fix.

As a side note, I did notice that right off the main hot water output is a valve that supplies the house. It has the normal knob for on and off but then has a small "*****" below. Is this a flow adjust? Never seen anything like this before (not being a plumber). I tried to turn by hand but could not.

Thanks in advance!

Darryl


bowenguinan

02:06PM | 11/02/06
Member Since: 11/01/06
2 lifetime posts
Sorry, I meant "Hyrdonic" in my last post

rlaney

07:04AM | 11/04/07
Member Since: 08/21/05
1 lifetime posts
I am on city water and my expansion tank has gone bad again. I replaced it in Jan 2003. The only issue I have is that my water pressure gets high I believe. It comes out of the faucets faster and harder.

The last time I also replaced the water pressure valve.

Before I had it fixed all my stop valves were leaking and I ruined my hot water heater and had to replace it also.

I guess what I would like to know now is it just my expansion tank. I do I know that the water pressure valve is functioning as it should? Can anyone assist me? My hot water stop valve to my washer is already leaking??

Thanks in advance.

Rita


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