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Old 12-13-2012, 09:58 AM   #1
abatsch
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So this past weekend my buddy and I were using our blichmann burner for the second time. After using it for the strike and sparge water fine, it back fired by the hose. I was wondering what may have caused this. It happened three times before we brought out the old turkey fryer burner. Some more background info: 46 degrees, tank was starting to to freeze up but worked fine for the other burner(I'm guessing lower pressure) and the wind wasn't too crazy. Any help would be greatly appreciated.

 
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Old 12-13-2012, 10:01 AM   #2
abatsch
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Sorry, after the strike and sparge water were fine it back fired shortly before reaching the boil.

 
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Old 12-13-2012, 10:03 AM   #3
abatsch
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Deleted repost.

 
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Old 12-13-2012, 10:54 AM   #4

I don't know what you mean by backfired. Would you explain it another way, please?

 
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Old 12-13-2012, 02:24 PM   #5
day_trippr
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I expect he means he saw flames in (and maybe shooting out of) the venturi bell. I run a pair of those Blichmanns and have never experienced that, but I've read of it happening.

Assuming it's not a leak at the crimped-on hose coupling (that's also been reported here at least once)...and given that the floor stand design pretty much precludes insufficient burner-to-pot clearance...and that the burner managed to get through heating up the strike and sparge water without issue... I would guess there wasn't enough gas volume flowing through the burner (perhaps due to that freezing tank) so it back-fired through the venturi.

I can get the same thing to happen when I shut off the gas at the end of a session, but it's just a "pop"...

Cheers!

 
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Old 12-13-2012, 02:33 PM   #6
JordanThomas
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I'd return it... personally.

 
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Old 12-13-2012, 06:22 PM   #7

Quote:
Originally Posted by day_trippr View Post
I expect he means he saw flames in (and maybe shooting out of) the venturi bell. I run a pair of those Blichmanns and have never experienced that, but I've read of it happening.

Assuming it's not a leak at the crimped-on hose coupling (that's also been reported here at least once)...and given that the floor stand design pretty much precludes insufficient burner-to-pot clearance...and that the burner managed to get through heating up the strike and sparge water without issue... I would guess there wasn't enough gas volume flowing through the burner (perhaps due to that freezing tank) so it back-fired through the venturi.

I can get the same thing to happen when I shut off the gas at the end of a session, but it's just a "pop"...

Cheers!
I don't know what the venturi bell is (and google didn't help) - is that the piece where you control the air/oxygen flow?

I also get a 'pop' when I turn off the gas, but have never paid much attention.

 
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Old 12-13-2012, 07:43 PM   #8
sctocinci
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Stick the tank in some warm water and see if it still happens. I have to do this on a cold day to keep the pressure up some times.
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Old 12-14-2012, 04:49 AM   #9
day_trippr
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Quote:
Originally Posted by Pappers_ View Post
I don't know what the venturi bell is (and google didn't help) - is that the piece where you control the air/oxygen flow? [...]
The piece that controls the air flow is a damper. The damper covers the mouth of the bell-shaped induction manifold. The pressurized gas passing through the flare fitting in the center of the damper pulls air through the damper openings, a phenomenon caused by the venturi effect - which occurs within the "bell".

Not all of the required make-up air for full combustion at the nozzle tips is provided via the induction system - additional air is required at the nozzle tips. If this wasn't the case you'd always have a roaring fire within the manifold (not good).

When the gas flow declines too far the air/fuel ratio within the manifold will approach the level required for combustion, and you'll get the "back fire" effect.

Thus I expect this was yet another case of the contents of the propane tank getting so cold the evaporative pressure dropped too low to maintain the excessively rich air/fuel ratio within the manifold, and it lit up...

Cheers!

 
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Old 12-14-2012, 05:05 AM   #10
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Quote:
Originally Posted by Pappers_ View Post
I don't know what the venturi bell is (and google didn't help) - is that the piece where you control the air/oxygen flow?

I also get a 'pop' when I turn off the gas, but have never paid much attention.
Did you notice that the "old turkey frier" saved the day? I love those things. 60,000 btu of reliable, cheap heat.

 
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