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Galvanized stack! Is it safe?

 
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DoctorGrill
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Joined: 07 Feb 2011
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PostPosted: Fri Feb 03 12 9:59 am    Post subject: Galvanized stack! Is it safe? Reply with quote

Built a stick burner, used a galvanized 4" exhaust pipe. It does not go in the cook chamber. Attaches on the outside You folks think its safe.
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TrailerBuilder
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PostPosted: Fri Feb 03 12 10:19 am    Post subject: Reply with quote

It still amazes me that people know the risks and the dangers of galv yet they continue to use it. Is it safe as a stack? Who knows?? But why would you even chance it???
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DoctorGrill
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PostPosted: Fri Feb 03 12 11:06 am    Post subject: Reply with quote

I don't know the risks. That's why I am asking! Built it about 4 years ago. Can easily cut it off and replace it. A post earlier about a tank got me thinking. The rest of the pit is steel. 1/2 plate box. 3/8 cooking chamber. Need some opinions.
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Catman
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PostPosted: Fri Feb 03 12 12:23 pm    Post subject: Reply with quote

My opinion is.....
That is one HEAVY cooker!

Got no clue about the galv stack.
It probably won't get hot enough to matter, but why take the chance?
Replace it.
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Beertooth
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PostPosted: Fri Feb 03 12 12:25 pm    Post subject: Reply with quote

I know enough about it to stay the hell away from it. Shocked

Seriously, stay away from it. Change the stack.

I would feel better about inviting some friends &/or neighbors over if I knew it was safe, not just "pretty sure it was."
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TrailerBuilder
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PostPosted: Fri Feb 03 12 12:44 pm    Post subject: Reply with quote

DoctorGrill, galv has to get to a certain temp before it puts off its toxic fumes, around 700* I think?? So, are your stacks going to get that hot, probably never, but why would a person want to risk his guests or his own health? Galv poisoning sucks! Plain and simple! If you had different stacks available, I'd change them no questions asked, but that's just my 2c worth.
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ChuckieD
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PostPosted: Fri Feb 03 12 1:10 pm    Post subject: Reply with quote

DoctorGrill,
This is my general rule of thumb,
Galvinize + heat + food = Bad Mu Shu Shocked
I would never use it on a cooker.
I'm with TrailerBuilder on this one bro...
jm2c Wink
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lennyk
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PostPosted: Fri Feb 03 12 7:45 pm    Post subject: Reply with quote

instead of galvanized pipe you should be able to find aluminized pipe at muffler places
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KAKid
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PostPosted: Sat Feb 04 12 3:13 am    Post subject: Reply with quote

The galvanized/zinc issue made me curious, so did some research. Melting point for zinc is 700+F and vaporization point is 1600+F based on info garnered from several sites. That doesn't mean I'm gonna use or advocate using anything galvanized. What mystifies me is, there are a lot of recommendations for using brass fittings on smokers, especially for thermometer access in a UDS as well as ball valve air intakes. Yet brass is a copper/zinc alloy. I'm guessing it must be due to some technical/scientific difference in plating vice being an alloy that I'll never even pretend to comprehend. Just seems a bit odd to me.
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mrcustomsteel
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PostPosted: Sat Feb 04 12 4:31 am    Post subject: Reply with quote

If you have been using it for four years then it's probably sealed in creosete and grease like the rest of the inside of your smoker. Since it's on the stack you were probably most exposed to the fumes when you welded it on. I wouldn't worry about it at this point since it's on the stack. But hey, you're the one eating it.
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BBQMAN
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PostPosted: Sat Feb 04 12 5:53 am    Post subject: Reply with quote

mrcustomsteel wrote:
If you have been using it for four years then it's probably sealed in creosete and grease like the rest of the inside of your smoker. Since it's on the stack you were probably most exposed to the fumes when you welded it on. I wouldn't worry about it at this point since it's on the stack. But hey, you're the one eating it.


+1

Generally we all recommend NOT building with galvanized.

Regardless of the melting point it also flakes off- not good eats.

In all my years of building food grade machinery we never used galvanized anything.

For a reason.

In this case, I agree with D- it's already smutzed up enough not to worry it.
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dakota0311



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PostPosted: Sat Feb 04 12 6:48 am    Post subject: Reply with quote

is it safe to use as an exhaust stack? yes. would i use it? no. the point were the the galvinized burns or lets off vapors is high enough the that it wouldn't be an issue but there are always the what if factors.
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k.a.m.
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PostPosted: Sat Feb 04 12 7:35 am    Post subject: Reply with quote

Well I am glad all this is settled. Wink
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DoctorGrill
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PostPosted: Wed Feb 08 12 9:37 am    Post subject: Reply with quote

Thanks guys! I need to do some work on it anyway. Might as well cut it off and replace. Wish I was reading the ring when we built it. Thanks again.
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