Expansion tank specs


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Old 10-18-06, 05:02 PM
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Expansion tank specs

I am replacing a leaking expansion tank. The old tank is a Amtrol Extrol model 30; The local home center told me I can replace it with a Watts Industries ET-30. However, there are some discrepancies in the specs:
The Watts is slightly larger (Tank: 4.7 Gallon vs. 4.4 Gallons; Acceptance: 3.0 Gallon vs. 2.5 Gallons)

The working pressure on the Watts is significantly less (60 PSIG vs. 100 PSIG for the Amtrol) -- since the pressure is typically 12-20 PSIG, is this a critical difference?

Are these tanks truly interchangeable?

Thanks!
 
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Old 10-19-06, 03:15 PM
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Watts ET-30

The Watts ET-30 is a replacement for your current tank, but I do not recommend it since it has no valve for checking/adjusting the air pressure.
 
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Old 10-19-06, 06:53 PM
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Watts Et 30

Thank you for the response Sir.
The Watts tank actually does have a Schrader-type air valve (automobile tire air valve) at the opposite end from the NPT fitting. The spec sheet does not mention it for some reason, but I checked an actual unit and it is defintely there.
Would the greater working pressure of the Amtrol (100 PSI vs. 60) be likely to result in better longevity even though both are well above the actual working pressure of 12-20 PSIG? The Amtrol I have now only lasted 8 years before developing a pin-hole leak, so I am not too impressed with that.

Thanks again!
 
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Old 10-20-06, 04:21 AM
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I think you are confused. Both of those tanks designed to work at 12 psi and have 12 psi air charge in them. However, they have different max. design pressure, for Watts 60 and 100psi for Amtrol.
 
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Old 10-20-06, 04:59 AM
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Question

Thank you. I understand that both are suitable replacements. My question is if there is any advantage to using the product with 100 PSIG vs 60PSIG max working pressure in terms of product longevity and durability -- i.e. will it last longer?
 
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Old 10-20-06, 01:54 PM
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Tank

Probably no significant difference in the tanks. I didn't see a schrader in the web pic thus my comment.
 
 

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