So, What Exactly Are the Objections to Galv. Flu Pipe?

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smokeyCityTeacher
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Post Fri. Dec. 25, 2009 9:18 pm

I been reading all the old threads and the only objection I see is that if sufficiently heated can give of fumes or toxic gases from the galv. process.

What are the other objections to it? In my town Galvanized is fully accepted by our inspector. He says that as long it is not heated with a torch or heat gun its fine.

Since coal stoves don't have high stack temps I don't see why it can't be used.

But of course, Id like to hear more before collecting my Darwin award. :oops:
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Post Fri. Dec. 25, 2009 9:38 pm

It can be used, the manufacturers don't recommend it for solid fuel. No off gas to my knowledge, the temps just aren't hot enough. The zinc just comes off on your hands once it gets overheated.
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Post Fri. Dec. 25, 2009 10:07 pm

On a properly managed stove or boiler you can probably get away with it but if you have a rip roaring fire like I do you will be opening all the windows initially. The fumes where nasty. After I cooked it the fumes that come off it are minimal. The galvanizing went from shiny to flat gray after overheating. Overheating the galvanized stove pipe at this point doesn't seem to put off any addition fumes or odors. After experiencing it once I would never do it again by choice. I think black painted pipe is safer.
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Post Sat. Dec. 26, 2009 2:36 am

The fumes are very bad for your health. Galvanized pipe has its uses, but to put a lot of heat to them is a serious no no.

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Post Sat. Dec. 26, 2009 6:01 am

I am using simpson B-vent double wall (i think galvanized?) on my direct vent keystoker, a buddy gave it to me (So the price was right) and its working fine, I had to seal up the joints being a direct vent, but 2nd year running with it with no problems.

didn't you already post this?

More Galvanized Pipe Questions ...
- Dave
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- Amsoil Authorized T1 Certified Dealer

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Post Sat. Dec. 26, 2009 6:52 am

I think Galvanized pipe is OK. The most it will do is stink once. Yes, it's acrid and you shouldn't breath it as it might make you ill for a day, but deadly? I don't believe so. Here's the only thing I could find concerning galvy fumes: "If you can quote any authoritative place where it says these fumes are cumulative or deadly we will be happy to include the link and help to get the word out."
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Post Sat. Dec. 26, 2009 7:32 am

Thanks Freddy for getting me to look deeper than my personal experience. What I have gathered from these links is that galvanized pipe can cause temporary respitory symptoms if overheated but no long term effects. I still think it is nasty and I will use painted pipe in the future but the galvanized shouldn't present long term health issues. Zinc Links...................


http://www.nlm.nih.gov/medlineplus/ency/article/002570.htm

http://www.sperkoengineering.com/html/articles/We ... anized.pdf
**Broken Link(s) Removed**http://nj.gov/health/eoh/rtkweb/documents/fs/2037.pdf
Last edited by cokehead on Sat. Dec. 26, 2009 7:54 am, edited 1 time in total.
"When the people find that they can vote themselves money, that will herald the end of the republic. As we must account for every idle word, so must we account for every idle silence. Half a truth is often a great lie. He that lives upon hope will die fasting. Rather go to bed with out dinner than to rise in debt. The Constitution only gives people the right to pursue happiness. You have to catch it yourself." Benjamin Franklin

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Post Sat. Dec. 26, 2009 7:51 am

I have never heard an objection to galvanized stove pipe that is the only thing I have ever seen in use around here on boilers. I saw the black painted pipe used for stoves but always thought it was more for looks. Two years ago we replace one section of galvanized on my mom’s boiler that was probably 20 years old. The other sections looked good. My galvanized looks like new after a few years but keep in mind these boilers have fire in them the entire year.
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Post Sat. Dec. 26, 2009 9:25 am

yea I wasnt blessed with a boiler.......pipes rust out in the summer

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Post Sat. Dec. 26, 2009 12:41 pm

Galvy is used on oil boiler pipes around here ..... at least it had been since their invention. Who knows what they use now....
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Post Sat. Dec. 26, 2009 1:22 pm

The acid from the fly ash will tend to corrode galvinized pipe more quickly than stainless. For a boiler it may not be as much of a problem since you'll be burning year round and the acids only become a big problem if the ash gets hit with humidity/condensation. For a stove or seasonal heating source, though, it must be thoroughly cleaned at the end of the heating season to avoid it getting eaten apart too quickly.

This was discussed in episode 9 of the CoalCast when Paul Waelder (HVAC contractor, coal burner, and partner at Automation Correct) on as a guest to discuss this and other coal stove venting issues.

Coalcast Ep9: "Venting, Dampers and Flue Pipe" - November 5th, 2009
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Post Thu. Jan. 21, 2010 8:34 pm

Just wanted to know if anyone has ever used a piece of 6" well casing for a chimney? I use one as of now ($50 for 20' and 5-2' sections of single wall to get me 3' above roof line) couldnt beat that for a chimney price. I rent a house off of my boss and I am located on the edge of one of his gravel pits. About 5 mi from town. And I sit about 250 yards off of the rural road, so no one will get a good look at it. He was perfectly fine w/ me putting a stove in. The pipe is held out about 2 1/2' away from the house with double wall exiting flashing of an open window. My set up is temporary incase I ever want to move. I wanted to know if anyone has ever used this type of setup? About how long will the case last? I would put pic of it up but I cant figure out how to put it in the msg.
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Post Thu. Jan. 21, 2010 8:58 pm

It will last at least 40 years. Just have a clean-out in the bottom, and use it. I see a lot of 8" well casing chimneys in my travels, also. Lots of culvert pipe also in huge units. Folks in the city don't usually do this, however in the country......... :D

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Post Fri. Jan. 22, 2010 12:37 am

lumpocoal wrote:Just wanted to know if anyone has ever used a piece of 6" well casing for a chimney?
Used some of that for a stove in my dads shop, it's been there since about...1980 and it's still ok. This is in NW Colorado where summer humidity is low, we never have problems with regular stove pipe rusting out either. 8-)
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Post Fri. Jan. 22, 2010 11:17 am

Figured it out-

NFPA 211 - prohibits galvanized pipe for use as chimney connectors on solid fuel appliances.

I am not sure what year NFPA added this.

Depending on the Local Authority having Jurisdiction, NFPA may or may not be enforced.

Most galvanized pipe comes in 26 to 30 gauge.

The black stove pipe is made in 24 gauge.

Someone must of figured that heavier is better.
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