help with forced air burner blowers

Discussion in 'Shop Talk - BladeSmith Questions and Answers' started by dodo s, May 3, 2016.

  1. dodo s

    dodo s

    13
    Apr 2, 2016
    Hey guys looking for a lil help i am making a new forge and i am thinking about getting 2 forced air burners from hightemptools.com ok so no problem there but now i need 2 blowers for the burners and i have been having a real hard time finding them at a decent price that will work good a few people gave me a couple of specs i want to look for but i cant find anything withing those parameters. i would really appreciate it if any of you can help me find 2 blowers for the job or any sites that may have them anything i need some one to point me in the right direction i have been searching for hours with no sucess THANKS to any one who can help!
     
  2. NC Biker

    NC Biker

    682
    Apr 8, 2014
    I'm using a Dayton 2C647A HVAC blower that I picked up from Graingers. It works, but if I'd had the money, I'd have gotten a forge blower from Blacksmith Depot.
     
  3. Teppojutsu

    Teppojutsu

    947
    Jan 18, 2015
    Look up T rex burner ;)
     
  4. dodo s

    dodo s

    13
    Apr 2, 2016
    Thanks guys ....NC biker....the one you got its decent? you only run one burner on it right? Teppojutsu....i have read about the T rex dont get me wrong it looks like a absolutly awesome burner it really does...but from what i have seen and what i am told the forced air burners use much less propane since they are generally used at lower psi's....thats what i want i only use 20# tanks so even with my sidearm venturi burner i go through tanks quick....if i had a 50 or 100 tank i would seriously consider the t rex
     
  5. NickBoyle

    NickBoyle

    195
    Oct 9, 2015
    Check eBay for a blower for a kids bouncy house. I got one and it works great and they're pretty cheap. I run my forge and a air curtain off it and it's still a lot of blower!
     
  6. NC Biker

    NC Biker

    682
    Apr 8, 2014
    Yeah, it provides plenty of air and does the job. I have it hooked up to a cheap rheostat I picked up on ebay to control the speed.
     
  7. Stacy E. Apelt - Bladesmith

    Stacy E. Apelt - Bladesmith ilmarinen - MODERATOR Moderator Knifemaker / Craftsman / Service Provider

    Aug 20, 2004
    You only need one blower for two or three burners. Just make a manifold that sends the air to each burner. Each burner should have its own gas needle valve.
     
  8. dodo s

    dodo s

    13
    Apr 2, 2016
    thanks guys.....stacy...really is there a certain rating that the blower has to meet to run more than one burner....some one told me that most blowers (that i could get without spending a fortune) are not powerfull enough for more than one burner
     
  9. deker

    deker

    Nov 14, 2005
    There are two things to consider. First is how many cubic feet per minute (CFM) a blower is able to push, and second (and more often ignored) is static pressure (measured in Pascals or inches of water). Just because a blower can push ENOUGH air (CFM) for your forge doesn't mean that it can push it HARD ENOUGH (static pressure).

    I use a (very) hacked up version of the burner I got from high temp tools years ago with a small, pretty low pressure squirrel cage fan and it works ok. Mind you this is for a small forge (8" round tube 13" long). When I run the bigger forge, I have to use a shopvac attached to a variac to get enough pressure and airflow.

    You haven't given any idea on the size of your forges, so it's hard to recommend something specific. that being said, as long as you can gate it off, more air and more positive pressure are generally good to have. You can always shut a valve to get less air, but you can't make a blower put out more. A blower like this one is cheap, puts out 250CFM of air and even if it's on the low end of the chart they show at 1400Pa (5.62 in/h2o) will provide enough pressure for you to run a sizeable forge with the burners you're looking at.

    One note on the high temp tools burners. Go to the HW store and grab some extra 2" 90-degree elbows and 6" pipe nipples. As a few bends and some more pipe after the gas injection port. The extra mixing chamber and turbulence it creates will net you an additional 300-400F at the same air/gas flow. I was amazed at how well it worked for me. I have some pictures somewhere that I can post if you want me to find them.
     
  10. dodo s

    dodo s

    13
    Apr 2, 2016
    deker thanks. i have a forge that is 8in pipe with 1in of inswool and satinite but only ablout 10-11 in deep, the one i am making is 8 in stove pipe 1 in of inswool satinite and a fire brick floor and probilly bubble allumina where the wool meets the fire brick (thats what i did in the first one and worked out ok) however this one will be between 18-24 in deep. i just ordered 2 forced air burner kits from high temp tools he did say i may not need both on that forge i guess depends how long i decide on....if i dont need both i can replace the venturi on the smaller one..... this guy that has been helping me for a while now said he used to have one of those blowers made for bounce houses that worked real well but there are a million different kinds of them so i found a cheaper one $40 that is 5.2 amps he said all the blowers that he has used that have been over 2 amps (and sometimes lower) have worked out great. and it should have good static pressure as its made to blow up a bounce house when kids are jumping on it i ordered one so ill see how it works if i can put both burners on one blower great if not ill have to get another i just didnt want to buy 2 until i know 100% its going to work good......about the extra chamber sounds real good but yeh if you have pics send them or post them i would love to see.....thanks again
     
  11. elementfe

    elementfe

    May 3, 2008
    If you go to a blacksmiths' work party, you're likely to see a whole room full of forges running on something like hair dryers or bathroom exhaust fans. It just doesn't take much air to push a big flame.
    I have that same Dayton blower mentioned above, and it's enough blower to run probably four or five forges. The air gate is closed, and my single burner forge is 21" by about 8" round. I weld in it all the time, no problem.
    Blown forges are NOT more efficient with propane than venturi forges are.
     
  12. Stacy E. Apelt - Bladesmith

    Stacy E. Apelt - Bladesmith ilmarinen - MODERATOR Moderator Knifemaker / Craftsman / Service Provider

    Aug 20, 2004
    Both sides have a valid argument. It is usually a price vs amount of continuous use vs availability issue. You pick the two that fit you best and go with that.

    A) A blower should be able to supply sufficient volume as well as static pressure. A curved vane or radial vane fan makes the best type ( like a commercial forge blower). These are more expensive, but better/heavier built.

    B) A simple squirrel cage blower will work just fine on most forges. The Daton blowers do quite well at a very low price. They sometimes don't last as long, and are usually light weight units.

    On a small forge with a simple 3/4" burner, a large hair dryer will suffice. The best part of this use is they can be found at every yard sale or thrift store for $1.

    On a basic size home built forge for general forging and HT, a Daton blower should work just fine. THey can be found for between $20 and $75.

    For a dedicated welding or large damascus forge, a proper forge blower is by far the better choice. These run $70 to $200.

    I personally don't like the use of shop-vacs, leaf blowers, and compressors. If it is all you have, use them, but they are not my idea of a good choice.
     

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