More galvanized pipe questions ...

More galvanized pipe questions ...

PostBy: smokeyCityTeacher On: Fri Dec 25, 2009 10:23 pm

If I were to super heat the galvanized and open all the windows etc. could I do a "burn off" sort of thing like you might do with a new stove to cure the paint and get the initial toxic fumes release phase over with ?

Or will the galvanized continually release the fumes over its lifespan when super heated ?

Anyone know the temperature at which Galvanized starts to release bad fumes?
smokeyCityTeacher
 
Stove/Furnace Make: Englander, Hitzer
Stove/Furnace Model: 30-NC, 30-95

Re: More galvanized pipe questions ...

PostBy: Poconoeagle On: Fri Dec 25, 2009 10:29 pm

I dont know exactly but having done my fair share of oxy/acetylene torch work it can be heated till it vaporizes and out gasses and wont do so after that rendering the base metal acceptible to brazing or welding. this temp is far greater than you will ever see with your appliance.

torch surpasses several thousand degrees... its not a good idea to try and achieve this "burn off" phaze you are talking about in my opinion. if you were burning wood and extremely overfire a stove and the vent stack would turn orange and hotter than you are closer to achieving your burning off...
Poconoeagle
 
Stove/Furnace Make: Buckwalter & Co. , EFM520
Stove/Furnace Model: No. 28 Glenwood 1880, Alaska

Re: More galvanized pipe questions ...

PostBy: coaledsweat On: Fri Dec 25, 2009 10:31 pm

I wouldn't worry about any fumes unless you start welding it. If overheated, the surface coating of zinc will tend to shed. If the pipe starts to rust, you know it is cooked. :)
coaledsweat
 
Stoker Coal Boiler: Axeman Anderson 260M
Coal Size/Type: Pea


Re: More galvanized pipe questions ...

PostBy: smokeyCityTeacher On: Fri Dec 25, 2009 10:36 pm

coaledsweat wrote:I wouldn't worry about any fumes unless you start welding it. If overheated, the surface coating of zinc will tend to shed. If the pipe starts to rust, you know it is cooked. :)


Since I have a lot of galv pipe around Im hoping that stack temps of less than 300 will be safe.

If this galv. does make me sick ill go straight to 316 welded seams and take the guesswork out of it.
smokeyCityTeacher
 
Stove/Furnace Make: Englander, Hitzer
Stove/Furnace Model: 30-NC, 30-95

Re: More galvanized pipe questions ...

PostBy: Richard S. On: Fri Dec 25, 2009 10:42 pm

Galvanized is standard practice forever when installing coal appliance in this area.
Richard S.
 
Stoker Coal Boiler: Van Wert VA1200
Coal Size/Type: Buckwheat/Anthracite

Re: More galvanized pipe questions ...

PostBy: franco b On: Fri Dec 25, 2009 10:45 pm

Just leave it alone and use it. All coal stoves in years past used galvanized. When overheated it gets a crystalline look which takes a stack temperature of about 600 degrees for some time. You are very unlikely to have stack temps. that high.

richard
franco b
 
Hand Fed Coal Stove: V ermont Castings 2310, Franco Belge 262
Baseburners & Antiques: Glenwood Modern Oak 114
Coal Size/Type: nut and pea

Re: More galvanized pipe questions ...

PostBy: coaledsweat On: Sat Dec 26, 2009 9:47 am

smokeyCityTeacher wrote:Since I have a lot of galv pipe around Im hoping that stack temps of less than 300 will be safe.

It should take twice that with no trouble, the galvanized starts to go away at 700-800* range depending on if it is hot dipped or electrically coated IIRC. Coal isn't a big deal, wood is because it can get much hotter in a hurry.
As long as the coating looks normal, it isn't an issue. Once it gets toasted, the pipe will pinhole like crazy and it is difficult to tell. It will etch itself very thin like paper in a short time and eventually crumble.
coaledsweat
 
Stoker Coal Boiler: Axeman Anderson 260M
Coal Size/Type: Pea

Re: More galvanized pipe questions ...

PostBy: crazy4coal On: Sat Dec 26, 2009 9:57 am

About 30 yrs ago I was on a job that I was welding galvnized pipe for a few days, the old welder that I was working with told me to get a qt of milk at lunch time and drink the qt for lunch. He said that the milk would flush the zinc from my system so I would'n turn yellow. I didn't turn yellow and I'am still here. Maybe he was right?
crazy4coal
 
Stove/Furnace Make: buderus
Stove/Furnace Model: logana

Re: More galvanized pipe questions ...

PostBy: cokehead On: Sat Dec 26, 2009 10:15 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 ... 002570.htm

http://www.sperkoengineering.com/html/a ... anized.pdf


http://www.osha.gov/SLTC/healthguidelines/zincoxide/recognition.html
This link is broken, either the page no longer exists or there is some other issue like a typo.


http://nj.gov/health/eoh/rtkweb/documents/fs/2037.pdf
cokehead
 
Stove/Furnace Make: Locke, Godin, Tarm in da works
Stove/Furnace Model: Warm Morning 617-A, 3721, 502