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Thread: Hood, draft

  1. #1
    Join Date
    Feb 2013
    Location
    Volney, NY
    Posts
    275

    Default Hood, draft

    Hey all!
    I have a 2x6 drop flue rig that's going to produce lots of vapor and it's located in a 10x20 steel-roofed shed with a 12-12 pitch. The shed is open on all 4 sides and has 9' tall walls.
    Q1.Without hoods, will there be excessive condensation dripping all over everything including into the pans?

    I have a scorched 4x6 syrup pan that I was thinking of inverting and suspending as a hood over the rig and fitting with some round, galvanized, 8" ductwork to function as vapor stacks.
    Q2. How many of these 8" stacks should I install into my "hood" to vent the vapor from a 2x6?
    Q3. Will I get adequate draft if the stacks have 2-90' bends if I get at least 12' overall height?
    Q4. Will the "hood" vent adequate vapor if it is flat rather than peaked?

    Thanks!

  2. #2
    Join Date
    Jan 2014
    Location
    westfield ma
    Posts
    438

    Default

    i made a homemade hood for my 4 foot flue pan ( that sat tight on the top of the pan lip) with 1 - 9 inch stainless stack about 8 feet long with flip cap ( was new, unused smoke stack for a evap) and it boiled the flue pan harder and vented to vapor like a chimney on fire and my operation is under a 5/12 metal roof car port off the side of my building that was open on 3 sides now only 1 with little to no drip age
    2x6 leader WSE with AUF, hood,preheater
    waterguy RO
    leader 16 gal custom water jacketed canner
    10 in short stack wes fab filter press
    540 taps on tubing with vac & always adding
    2- benders running 25" hg from GAST vac pumps
    few stainless bulk tanks
    1978 chevy 1 ton 4x4 dually
    IH T340 dozer with 6-way blade

  3. #3
    Join Date
    Feb 2013
    Location
    Volney, NY
    Posts
    275

    Default

    Westmaples: thanks. Sounds good!!

  4. #4
    Join Date
    Nov 2008
    Location
    Adirondacks
    Posts
    2,786

    Default

    U can make a hood out of pic and plastic sheeting if u need. Many hoods made like this. It's just to collect the steam and concentrate it so to speak. The higher the steam gets the colder then condenses.
    FIRST GENERATION SUGARMAKER
    First boil 2/22/2012! Went Pefect!
    3,500' of laterals
    1,000' of mainline
    2012 - 105 taps on gravity, 12 sap sacks.
    2013 - 175 taps on gravity, 25 on sacks = 200 taps for 2013! Second year.
    2014 - 250 taps on gravity, 25 on sacks
    Tapped on February 16, 2014
    2015 - adding vac sap puller no more gravity for me!
    275 gallon holding tank for 2014
    20'x30' Sugarhouse

  5. #5
    Join Date
    Jan 2011
    Location
    Poultney VT
    Posts
    2,420

    Default

    about three hours into your run condensation will be dripping all over you. my flu has a hood but no stack my syrup pan has no hood but need to get one this year or make one like ADK said. putting ceiling in sugar house need all steam out now.
    Business Name
    Flat Lander Sugaring (who would think a guy from Az be making syrup)
    125 on Sap Suckers
    Close to 475 High Vac
    400 gravity adding more
    leader 2x6
    home made preheater
    hoods
    1 7D749 for AOF
    New FLS Tsunami Arch
    4 membrane TR Industries RO 2HP 3 phase 601GPH 250 PSI
    PID Display for Arch Temp.
    Chumlee of the trader

  6. #6
    Join Date
    Jan 2006
    Location
    Oneida NY
    Posts
    11,730

    Default

    My only experience with a flat top hood was on my Half Pint and it was outside, under a vendor's style canopy. It had a 2' stack. Everything since then has had a peak style hood, however the current one and the previous one have/had a flat section big enough to put the stack into.
    Dave Klish, I recently bought a 2x6 wood fired evaporator from A&A Sheet Metal which I will be converting to oil fired
    Now have solar, 2x6 finish pan, 5 bank 7x7 filter press, large water jacketed bottler, and tankless water heater.
    Recently bought another Gingerich RO, this one was a 125, but a second membrane was added thus is a 250, like I had.
    After running a 2x3, a 2x6, 3x8 tapping from 79 taps up to 1320 all woodfired, now I'm going to a 2x6 oil fired and a 200-425 taps.

  7. #7
    Join Date
    Jan 2014
    Location
    westfield ma
    Posts
    438

    Default

    yes maple flats is right on defining the need to be peaked. if you have a Bascom`s , leader, cdl,.... catalog look at the pictures of the hood they have . that's where my idea`s started, I would look at the pics of the hoods & get excited about getting one.... then I looked at the price . shortly after I called my local metal supplier and ordered up 1-4x8 sheet of aluminum and bent it all up nice and neat on the siding break and pop riveted together . all said and done less than $250 including my time ( 3 hrs ) others have great ideas also mines is more of a factory influenced style
    2x6 leader WSE with AUF, hood,preheater
    waterguy RO
    leader 16 gal custom water jacketed canner
    10 in short stack wes fab filter press
    540 taps on tubing with vac & always adding
    2- benders running 25" hg from GAST vac pumps
    few stainless bulk tanks
    1978 chevy 1 ton 4x4 dually
    IH T340 dozer with 6-way blade

  8. #8
    Join Date
    Feb 2013
    Location
    Volney, NY
    Posts
    275

    Default

    MapleFlats,
    Thanks for the reply.
    Did your flat style hood on your Half Pint collect the vapor and exhaust it? Or did it cause vapor to condensate and drip back into the pan?
    Regards,
    Dave

  9. #9
    Join Date
    Feb 2013
    Location
    Volney, NY
    Posts
    275

    Default

    Flat Lander Sugaring,
    Thanks for the reply.
    When the vapor exits your hood does it condensate on the underside of your sugar house roof and start dripping all over you?
    I'm not 100% sure on what you mean by "putting ceiling in sugar house". Did you mean "hood"? I've never been in a sugar house with a ceiling.
    Regards,
    Dave

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