side pipes on a uds

Discussion in 'UDS Builds' started by deerjackie, Jan 1, 2010.

  1. deerjackie

    deerjackie Fire Starter

    what are the pipes i have seen on some drums that go from top of barrel to the bottom? heat and smoke exchangers? looks like they are connected with a 90 degree elbow at both ends. thanks for the info. dj
  2. smokin' dick

    smokin' dick Smoking Fanatic

    Those pipes are for air intake into the barrel. Usually they have a ball valve at the top for fine air control. This one is a 1" ball valve on a 1" pipe.
  3. deerjackie

    deerjackie Fire Starter its placed there for easy reach correct?
  4. deerjackie

    deerjackie Fire Starter

    i could nearly swear i saw one somewhere that re connected at the top like it was a re circ of some kind.
  5. meateater

    meateater Smoking Guru SMF Premier Member

    Yes, thats up at the top for ease of adjustment. I have a ball valve at the bottom of mine personally. To each his own preference, no right or wrong either way. [​IMG] Post a pic if your building one!
  6. badfrog

    badfrog Smoking Fanatic SMF Premier Member

    I have been reading alot the last few days and the last 3 hrs or so about how to build a question is how do you load/add charcoal/wood to it or is it that if loaded properly and air vents set properly one load will be all that is needed. Otherwise it seems to me you would have to completely remove everything to add. I have never cooked with one, but thinking about building one just to try it out.
  7. rbranstner

    rbranstner Smoking Guru OTBS Member

    The "real" reason the ball valve/air intake is put on a pipe and extended to the top of the smoker is because after a long day of smoking or should I say drinking you might have trouble bending down to adjust that ball valve. Or in other words you might just take a tumble into your smoker. hahaha Or at least that is what I was told. I thought it was a fair point so I extended mine as well.
    As for your question on loading your charcoal. It is all loaded from the top and you shoudl be able to get 10-15+ hours out of one basket depending on hot you are smoking and what size basket you have.
  8. funk

    funk Smoke Blower

    I also spent the last few hours looking at how to build the UDS. From the pictures I have seen, most have 3 intakes at the bottom and one has the ball valve. From most of the pictures I have seen, the other two are capped. Are three intake necessary and if so, what is the purpose of the other two? Should all three have a valve on them? I am new to this, so I am trying to understand.
  9. meateater

    meateater Smoking Guru SMF Premier Member

    The idea of the valve at the bottom of the UDS is to bring fresh air under your fire box and being able to control the temp of your fire. Ford, chevy or dodge theres no right or wrong. Many different ways are shown here and they all produce some great food. Just gotta find your nitch. So smoke on![​IMG]
  10. countryboy19

    countryboy19 Smoke Blower

    I'm a newb at UDS myself, but I think I know why they do this. There is only 1 ball valve because you only need 1 continuously variably air input. The other two can either be capped/uncapped. You only need to finely tune 1 input, rather than all 3. The 2 that have caps are your "coarse" adjustment, and the ball valve is the "fine" adjustment.

    So lets say you need the equivalent of 2.15 air inputs. This would mean you uncap both of the capped ones, and then crack the ball valve open a little bit. If you only need the equivalent of 1.45 air inputs, you leave one of the inputs capped, and then crack your ball valve open slightly less than half.

    Sure, you can put 3 ball valves on if you really want to, but they aren't cheap, and most of the time people build a UDS because they're cheap, not because they're fancy. You only need 1 ball valve, so why buy 3?
  11. coffee_junkie

    coffee_junkie Master of the Pit OTBS Member

    Yup what he said...I normally open all three to get it up to temp and get things moving along, then cap one, see what happens, usually end up then capping both and closing the ball valve 1/2 way. Sometimes the basket needs a "shake" so adjustment may be needed at that time also, but for the most part just set it and forget it.
  12. blackened

    blackened Meat Mopper

    Single 2 1/4" intake works well on mine..


  13. earache_my_eye

    earache_my_eye Smoking Fanatic OTBS Member

    You can save yourself some coin on the build by just using some flat, flexible fridge magnets over the intake holes. No need for the close nipples & caps, or even the ball valve setup. All total, it would knock about $12 - $15 off of your build.
    Use the extra cash to buy Weber brand charcoal and cooking grates...they're MUCH nicer than the cheapies that are out there, IMHO.

    Just my $.02,

  14. roller

    roller Smoking Guru SMF Premier Member

    So are you saying that the only reason that most people build and use them is price and not the way they cook?
  15. ddave

    ddave Master of the Pit OTBS Member SMF Premier Member

    I don't think that is what he is saying at all.  You can build them for a little money or you can spend a lot on them, it's up to you.

    Great thing is BOTH will cook about the same.  They cook great by the way.

  16. duck killer 1

    duck killer 1 Smoking Fanatic SMF Premier Member

    a UDS is a great smoker! it is almost a true set it and forget it smoker! 10 to 14 hours at 225*F on 10 Lbs of charcoal.[​IMG]
  17. ratdawg

    ratdawg Fire Starter

    Here is a new one that I just finished. I make them with the side pipe intake because I do not want to bend over to adjust it. I think the UDS style smokers work great. Like duck killer 1 said, it is pretty much set it and forget it.


    Last edited: Jun 19, 2010
    duck killer 1 likes this.
  18. elsparky

    elsparky Newbie

    Whats the typical LENGTH and WIDTH of said pipes ? I'm contemplating building a UDS, and am curious.
  19. smokinjoes

    smokinjoes Fire Starter

    @ratdawg  I really like what you have done there for fine control, no ball valves.  I am wondering why the controls at top and bottom?  Will they act differently on the smoker?  I mean technically both would control air flow, what I am wondering is this.  Can you control how much smoke is in the smoker with the top one as well as air flow?  Would the amount of smoke be the same if say the top one was open 25% and the bottom open 75% vs top open 75% and the bottom open 25%.  

    I mean both would equal 100% of 1 pipe open and should equate to the same amount of air flow, does closing the top retain more smoke than leaving it wide open?  There is a lot of volume in a 55g drum, I am not sure how that factors in if at all in regards to smoke retention vs air flow.  

    I would love to build my own UDS, but I am one of those guys who over thinks and over plans all the time.  Seeing your dual controls there brought up some questions I hadn't considered yet.  Thanks for that.  
  20. bill1

    bill1 Smoke Blower

    SmokinJoes--I think what you're asking is the relative cross-sectional area of the exhaust port relative to the input port.  The dominant view around these parts is that the exhaust should always be less restrictive (larger area) than the intake, otherwise you get "stagnant/acrid" smoke in your smoker.  The opposing viewpoint is that a slight over-pressure in a smoker aids smoke diffusion into the meat, although the difference that a fraction of a psi would make would seem fairly inconsequential.  Ratdawg's nice looking UDS (NLDS?) has a larger than normal intake (at least I estimate his intake area is larger than 3 times the normal 3/4 or 1" pipe intakes.)  But with adjustable flow, it's better to err too big than too small.  His also has wide adjustment on the exhaust.  My recommendation would normally be to try to keep the areas of each roughly equal, if you're choking off the intake, do a similar amount on the exhaust.  

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