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Expansion tank

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Comments

  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 16,507
    I believe that is for domestic water and has nothing to do with a hot water heating boiler. JMHO
  • Mark Eatherton
    Mark Eatherton Member Posts: 5,858
    A simple answer is that Amtrols model numbers equates to the total capacity of a non diaphragm tank. So if the existing non captive tank holds 30 gallons, then you want to use a #30 diaphragm tan. Adjust the pressure of the tank to the maximum required operating pressure.

    If in doubt, contact a hydronic system chemical treatment company and ask them to perform a sodium titrate test on your system, which takes a few days of cold weather. Basically, they dissolve a given poundage of salt into a 5 gallon bucket. They test the system for residual sodium before induction. Then induce the 5 gallons of salt water into the system and allow it to run for at least 48 hours during cold weather to ensure full mix and dilution. They then re-test the PPM of sodium in the system after the 48 hours. There is a direct correlation relationship between the 5 gallons of sodium induced into the system and the diluted test factor. They have a formula that tells them how many gallons are in the system.

    Hot Rod touched on it, but didn't go deep, so I will. If it is a non bladder expansion tank, you can NOT have ANY air elimination on the system. All system air has to be directed back to the expansion "cushion". If not, then you will water log the tank and start lifting the relief valves, which will lead to the induction of fresh water, which will eat steel, including the thin expansion tank.

    If you replace a non bladder/diaphragm tank with a bladder/diaphragm tank, you WANT to vent ALL air OUT of the system. The system will operate much quieter and efficiently, and the consumer will thank you for making it quieter.

    Regardless of what tank you decide to go with, it is critical that ALL pumps pump away from the expansion tanks connection to the system, which may or may not be the boiler. "Pumping away" from the boiler assumes the expansion tank is connected to the boiler. Not always the case.

    Now you know a lot more about expansion tanks than you wanted to. Take it (knowledge) out and apply it.

    ME

    There was an error rendering this rich post.

    Tinmankcopp
  • Mark Eatherton
    Mark Eatherton Member Posts: 5,858
    BTW, A.S.M.E. has numerous interpretations in the field. One is A Substantial Monetary Exchange :-) The other is Always, Sometimes, Maybe, Except...

    Enjoy!

    ME

    There was an error rendering this rich post.

    SWEI
  • Don_197
    Don_197 Member Posts: 184
    "In our area"........you can gang 6 of them into the piping.........no ASME is required unless those capacities/ratings are exceeded for SINGLE appliances. That being said.............if the inspector all the sudden decides you are pushing it...or he's having a bad week....he can change his mind any time he wants (and does sometimes) the ASME requirement would be for ALL pressure vessels...........storage tanks, expansion tanks, and boilers/water heaters in the system.
  • icesailor
    icesailor Member Posts: 7,265
    Mark Eatherton said:

    BTW, A.S.M.E. has numerous interpretations in the field. One is A Substantial Monetary Exchange :-) The other is Always, Sometimes, Maybe, Except...

    Enjoy!

    ME

    ME,

    I have always thought that I could use this brochure from Amtrol that has bee around since I can remember Amtrol's being light metallic blue.

    The use the input of the boiler and the type of emitting radiation to determine what bladder tank of theirs to install. Like on page 5 and page 6. There used to be something in there about bigger tanks for cold start boilers because of the increased water expansion from heating.

    Some of the people I've met have only an understanding of salt as it relates to their steak at Outback. That it isn't properly edible unless it looks like it was just brought inside from being out in the snow.

    http://www.amtrol.com/media/documents/extrol/MC2680_01_15_EXTROL_Brochure.pdf
  • Mark Eatherton
    Mark Eatherton Member Posts: 5,858
    Ice, I am familiar with that sizing chart. The manufacturers put a LOT of fat into their water volume calculations for those sizing charts. There is no negatives associated with an oversized expansion tank.

    Here's some Amtrol trivia for you. Prior to having the schrader air fill valve on the bottom of the tank, the prior tanks had no means of inducing pressure on the air side of the diaphragm. Do you know how they pressurized them?

    Also, when you get a spare moment, call me on my cell at seven two zero, three seven five, three one zero seven.

    Thanks!

    ME

    There was an error rendering this rich post.

  • hydro617
    hydro617 Member Posts: 5
    I installed a well McLain 1580 recently and I believe we used 2 floor mount 90 extrol

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