leaking taco 006 circulator

zeke

Took it apart and found the o-ring seal completely eaten up.

APPLICATION:

baseboard heating, copper and  cpvc piping.

Using  160 F hot water in open system . Municipal water.

Why ? And do you think  I should change to Viton seal.



Thank for your response

Big Ed_4

006

How old is the 006 ?

CMadatMe

Is that 006

of the bronze family?

Mark Eatherton

Oxidation....

My guess would be oxidation due to oxygen permeating through the CPVC piping. The higher the operating temperature, the faster it (O2) diffuses through the wall.



Rubber starts out soft, and begins getting hard. It's time to complete hardness is a function of operating temperature and exposure to oxygen, and can be compounded by the presence of metal (copper in your case) ions.



During our research for the Goodyear Rubber hose debacle, we found some pieces of hose that were so hard, that when smacked against a hard concrete surface, they would literally explode, like glass tubing.



If I were you, I would contact Taco and let them make a recommendation. It is their product, and if you misapply something, and it fails, you own it lock, stock and barrel.



ME

zeke

answer

Guys,

Thanks for responding.

It's a bronze 2 yr old pump and there is plenty of oxygen in the water since it is an open system.

The o-ring was almost completely disintegrated, with some residual rubber. I suspect the temperature played a  big role since that pump is sometimes running 20 hours continuously and is awfully hot to the touch, probably 200 F,though i haven't measured it. In spite of that, I find it difficult to believe that Taco didn't design it in.

I hadn't thought  about  oxygen.

What about using Viton since it has much higher temperature resistance?

hot_rod

the only way to know

for sure is to send it to a lab. Here is a failed o-ring from a DHW application.



Most often it is a water quality issue, yes even the water you are drinking from a public utility. Usually it is the same water in your hydronic system that is in your potable supply. hopefully not at the same time.



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