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Thread: Question on Expansion tanks.

  1. #21
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    Quote Originally Posted by WAYNE3298 View Post
    Deaerators are a crucial component of commercial steam systems.
    Interesting. Just read up.
    Are they mostly used on process steam, such as a commercial laundry mat?

    Looks like the purpose is corrosion control on feed water, so I'm assuming the boiler uses alot of feed.

  2. #22
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    Quote Originally Posted by hvacvegas View Post
    Interesting. Just read up.
    Are they mostly used on process steam, such as a commercial laundry mat?

    Looks like the purpose is corrosion control on feed water, so I'm assuming the boiler uses alot of feed.
    Yes DA tanks are not mandatory. They are mainly found in larger systems. Usually in process facilities and places like hospitals. Usually high pressure systems, but not always.

    There are several styles of DA tank. The primary function is to remove excess O2 from the water prior to being fed to the boiler. The second function is preheat.

    Most are heated by steam injection through whats called sparge tubes into the lower section of the tank.

    Some are direct fired, but thats rare. Some have pumps that draft from base of the tank, and pump into the top through spray nozzles similar to a cooling tower. That aids in seperating the air/O2. Some bring the returning system water in through nozzles that essentially do the same.

    Ive never seen one at a typical laundromat. But an industrial laundering service like for hospitals, uniform service or prisons may have them.

    Main benefit is added life cycle of the boiler tubes.

    Most are vented to atmosphere, some are pressurized having an adjustable pressure relief that has sets the pressure of the tank, the excess pressure vents to atmosphere.


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  4. #23
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    Good explanation heatingman. The vents are fixed orifices and are called non-condensables vents. They vent off gases such as excess oxygen and carbon monoxide that are destructive to the piping and boiler.
    No man can be both ignorant and free.
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  5. #24
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    When we set em up for pressure, we use multi port adjustable relief valves to set the cap pressure.

    Like these
    https://store.newterra.com/products/...t-relief-valve

    Sent from my SM-G930V using Tapatalk

  6. #25
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    I designed the really big systems and they were vented continuously.
    No man can be both ignorant and free.
    Thomas Jefferson

  7. #26
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    Those valves vent continuously once the set pressure is achieved.

    Instead of open close, they're more a sliding scale of openness. Nice even venting.

    Sent from my SM-G930V using Tapatalk

  8. #27
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    bladder tank systems need air strippers and autovents (agreed).
    " The more I learn the more I realize how much I don't know"

  9. #28
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    "I LOVE THE WAY YOU(s) TALK"

  10. #29
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    Heatingman I assume the set pressure on those valves is adjustable.
    No man can be both ignorant and free.
    Thomas Jefferson

  11. #30
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    Quote Originally Posted by WAYNE3298 View Post
    Heatingman I assume the set pressure on those valves is adjustable.
    Yes it is.


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  12. #31
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    Quote Originally Posted by TechmanTerry View Post
    "I LOVE THE WAY YOU(s) TALK"
    "I love the way you bail me out in a pinch"
    " The more I learn the more I realize how much I don't know"

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