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Thread: Whats your average evaporation rate?

  1. #1
    Join Date
    Mar 2009
    Southern Maine

    Default Whats your average evaporation rate?

    OK, I am not trying to start a peeing contest or anything like that but I was curious what people get for an evaporation rate?
    Basically what do you have for an evaporator, what heats it, do you use a pre-heater and whats the average evaporation rate you get on it? And I guess just for fun, whats the fastest you've ever had it going?

    I have a 2x4 wood fired evaporator on a brick arch with a 2x2 raised flu pan in the back and a 2x2 finishing pan in the front. I have a stainless 5 gallon box over the back dripping into the flu pan, but the saps still ice cold.
    On average I get about 15-18 gph, but managed to get it up to about 25 gph this last season when I got into some really dry pine.

    I guess I just want to know what I can look forward to if I go for a larger evaporator in a few years and realistically how much space will be needed once I get myself into vaccum.
    143 taps on a brand new 3/16th tubing setup.
    2'x6' W.F. Mason Drop Tube Evaporator
    12"x24" W.F. Mason finisher.

  2. #2
    Join Date
    Mar 2008
    Deerfield NH


    I got my old 2x4 up to 20ish with a blower and good wood.
    30x40 Sugarhouse
    Hoping to have 800 taps on our property this year, 350 on other bush
    3.5x10 Cabin by the Creek evap with "steamaway"
    CDL 600 RO
    RV2 pump at other bush, ebayed Sogevac at home

  3. #3
    Join Date
    Jul 2005
    Indiana, PA


    3x10 raised flue small brothers with a 7 ft flue pan. When woodfired, under perfect condtions 95 to 100 gph. It's set up for natural gas now, and I guess I'll find out the gph in about a month!
    Andy's Own Maple
    Andy Kinter (4th + generation maple producer)
    Approx 790 taps on vacuum

    3x10 nat. gas fired raised flue small bros.
    600 gph Lapierre RO
    Fine collection of used bulk tanks
    Kubota MX5100 sap hauler
    2 hives (that I don't spend enough time on)
    A great family that works together to make syrup!


  4. #4
    Join Date
    Jan 2006
    Oneida NY


    I have a 3x8 raised flue with a 3x6 flue pan, I like to run at 55-60 gph, can go to about 75 but I need to make a deflector similar to what Leader has on their 2x6WSE to keep the geysers contained in the front of the flue pan. Until then I'll stay at 55-60.
    Dave Klish about 1320 taps in '15, down to about 700 in '16, up to 850 for 2018?
    2012 Mahindra 36 HP 4x4/ loader/cab/heat/AC:-)
    added a gooseneck equipment trailer and F350 to tow it to haul more sap
    3x8 raised flue evaporator
    250 GPH converted to electric, RO by Ray Gingerich
    6.32 KW solar system, 1.48KW is battery backed up, all net metered
    website: www.cnymaple.com

  5. #5
    Join Date
    Apr 2007
    Starksboro, Vermont


    I have a 2x6 Phaneuf raised flue on a home made oil burning arch. I have a home made steam hood and pre-heater. I boil about 45-50gph.

    2x6 Phaneuf raised flue pans
    homemade oil burning arch & hood
    homemade RO,auto draw-off, releaser,auto-canning valve, filter press, ext.....
    850 taps

  6. #6
    Join Date
    Mar 2006
    Acworth, NH


    I would say I average low to mid 20s. I have had it really low and really cooking to 28 - 30 but at this level I really gota be on my toes! ):

    I am thinking of selling it, anybody interested?

  7. #7
    Join Date
    Jan 2004
    Norwood, NY


    90 GPH, no blower
    Maple syrup makers never die, they just evaporate.

    Kubota M-5040,Kubota B-2650,Kubota XRT 900, Sugarhouse is now a guest cottage.

  8. #8
    Join Date
    Feb 2009
    spencer, new york


    35 an hour forced draft, preheater 2x6 raised flue small bros.
    3rd generation maple producer
    3x10 Lightning Small Brothers (on natural gas)with piggyback
    Still need more taps, 1100 on vacuum
    A 24' x24' sugarhouse (2011)too small(2012)
    Homemade Finishing and Bottling Equipment (on natural gas)
    Brother to Brother operation with plenty
    of family and friends support
    Still expanding, new sugar house being planned for 2018

  9. #9
    Join Date
    May 2009
    UVM Proctor Maple Research Center, Underhill Ctr, VT


    Quote Originally Posted by T.Crowley View Post
    OK, I am not trying to start a peeing contest or anything like that but I was curious what people get for an evaporation rate?
    First thing ...are you talking evaporation rate INCLUDING or EXCLUDING the syrup production rate? If you're drawing off 2 gal of syrup per hour, you'd need to factor that into your calculations by subtracting it from your total sap processing rate. Evaporation rate typically EXCLUDES syrup production rate. When people mention evaportion rate they usually mean total system processing rate (how much sap you go through per hour). Using evaporation rate also removes the influence of whether you are boiling with sap or concentrate (and the level of concentrate). An evaporator boiling concentrate is going to produce sap at least 4x as fast as the same exact evaporator boiling sap, so the total system processing rate will be somewhat faster, but the evaporation rate is exactly the same.

    Given that, the numbers below are from an experiment we did this summer boiling with water...therefore they are evaporation rates EXCLUDING syrup production rates (if you up the number by about 10% you'd be close to total system processing rate). All were done on the same arch, oil-fired. All were a 3' x 10' Leader Revolution evaporator.

    Standard Evaporator
    Front pan + back pan (no hoods) = 83.3 gal/hr
    FP + BP + Steamaway (with hood) = 142.3 gal/hr
    FP + BP + SAW + Hood + Plate Heat Exchanger = 152.5 gal/hr

    Max Backpan with Enhanced SAW Evaporator+larger oil nozzles
    FP + Max Back Pan (no hoods) = 102.2 gal/hr
    FP + MBP + Enhanced SAW (with hood) = 175 gal.0/hr
    FP + MBP + ESAW + PHE = 189.0 gal/hr


    Regular SAW alone increased evaporation rate by 70.8%
    Enhanced SAW alone increased evaporation rate by 71.2%
    Max BP alone increased evaporation rate by 22.7%
    Enhanced SAW alone increased evaporation rate by 23.0%
    PHE increased evaporation rate by an avg of 7.5%

    Bottom line is that a SAW or or other preheater (steam pan) can greatly increase your evaporation rate and increase your fuel efficiency to a very large degree. A PHE can also help.

    The last thing is what we were really focusing on. A PHE uses the condensate from the SAW to preheat the incoming sap. It basically uses what is waste heat to do this. They are fairly efficient, simple and relatively inexpensive. We will be doing considerably more testing of PHEs in maple evaporators this coming season. Will know a lot more in May 2010.

    By making all these changes we almost doubled our system evaporation rate, and therefore also greatly increased our total system processing rate (evaporation rate + syrup production rate). The problem....we needed to then get a larger RO in order to keep up with the new evaporator. Adding another 900 taps to our total this year means we really needed it.
    Dr. Tim Perkins
    UVM Proctor Maple Research Ctr

  10. #10
    howden86 Guest


    515-550 gph

    5 x 14 thunderbolt plus piggyback.

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