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Thread: Foam Wjy is it bad?

  1. #1
    Join Date
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    Default Foam Why is it bad?

    So when you are boiling foam is bad correct?
    #1 Why? (Besides easier to see if it is going to boil over)
    #2 Turning down temp a little seems to remove the need for fighting foam. Why not do this?
    #3 Any reason to boil at say 3" instead of 1-1.5"?


    'm sure I'll have more questions. Lots of time to ponder while boiling with propane since I don't have too feed the fire lol
    Last edited by TheNamelessPoet; 03-07-2021 at 06:42 PM.
    2020 - 1st year 14 taps 1 Gallon Jugs + 4x 5-Gallon Buckets + Propane Grill + lots of headaches
    2021 - 2nd year - 19 Taps (and some free sap from a friend in the same own!) 145 or so OZ
    2022 -

  2. #2
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    #1 Foam can spill over the sides of the pan. It can also reduce the syrup available at the surface of the pan causing burns. This is particularly true in the syrup compartment of a divided pan.
    #2 Turning down the temp slows the evaporation rate.
    #3 Generally the deeper the sap the slower the evaporation rate because the steam bubbles have further to travel through the liquid layer before being released into the air. There will also be an increase in heat lost through the sides of the pan.
    60ish taps on buckets
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  3. #3
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    Default

    So... you want as shallow as you feel comfortable (and without risk of burning pan) with as little foam as possible without saturating a defoamer enough to taste it correct?
    2020 - 1st year 14 taps 1 Gallon Jugs + 4x 5-Gallon Buckets + Propane Grill + lots of headaches
    2021 - 2nd year - 19 Taps (and some free sap from a friend in the same own!) 145 or so OZ
    2022 -

  4. #4
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    That's the general idea. Boil at a depth that you are comfortable with and use just enough defoamer to manage the foam. Some foam is expected and isn't automatically an emergency. You want to keep it from spilling over the sides of the pan.
    60ish taps on buckets
    D&G Sportsman 18x63
    Turbo RB15 RO Bucket
    Stihl 044 and 026

  5. #5
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    Default

    Keep in mind there are two different things people refer to as"foam". There is the light foam that you can skim off if you like. It can be a bit of a nuisance if it builds up on the side of the pan. And then there is the massive amount of tiny bubbles that form sometimes as you approach syrup density. This is the"foam" that is much more problematic, as it can cause all your syrup to explode out of the pan and all over. If this happens there is nothing soaking up all the heat on your pan and it will burn and warp. That is what you are trying to prevent with the defoamer.

    GO
    2016: Homemade arch from old woodburning stove; 2 steam tray pans; 6 taps; 1.1 galls
    2017: Same setup. 15 taps; 4.5 galls
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  6. #6
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    Default

    Quote Originally Posted by TheNamelessPoet View Post
    So... you want as shallow as you feel comfortable (and without risk of burning pan) with as little foam as possible without saturating a defoamer enough to taste it correct?
    When Bruce Gillian from Leader Evaporator was presenting at maple conferences on evaporators and boiling he said there wasn’t a syrup pan made that the depth should be less than 1 1/2” of sap.
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  7. #7
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    I have heard reference to several places on the evaporator where drops of defamer should be put on a regular basis. Is there a specific rule of thumb to follow, one that I can make some sense of, that explains why it’s suggested to put defoamer in certain places? And how regularly it should be put in? I think I heard to put it in on start up, too. I haven’t found any clear and scientific resource that discusses this yet. Any suggestions or feedback would be great.

    Ellen

  8. #8
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    I add a drop of defoamer right at the inlet float box every time I fire. They pretty much takes care of everything. If I need a drop here or there then I add it where it is needed but that is pretty rare.
    Jake
    smoky lake 2x6 drop flue SSR on homemade arch
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  9. #9
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    I have ran alot of evaporators with only 1 inch. Some of those guys are after your wallet. The foam will mess with the levels so keep the pans clean, the foam down and boil hard and as shallow as you dare that makes syrup.
    Blaisdell's Maple Farm

  10. #10
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    Thanks Jake and Brian. Ok to use vegetable oil? Is that what “defoamer” is? And drops or I haven heard of spraying Pam Cooking Spray...

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