Exhaust tubing technical data

Discussion in 'General, Performance, Upgrades & Accessories' started by Boston, Feb 24, 2018.

  1. Boston

    Boston Full Access Member

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    I'm working [email protected] on a furnace and the exhaust gasses are really hot. 700°F+ so I'm concerned about a requirement that no component emit in the visible spectrum. I could go with Stainless but that stuff is expensive and I'm thinking if I just use diesel exhaust tubing I'll be well within the specifications. But naturally it's the weekend and I can't contact the manufacture and just ask for the specs, safety data and what not.

    Anyone have that info laying around ?

    I'm thinking on the Dynomax 16G 3.5" exhaust steel, what's it rated working temp ;-)

    Thanks guys. I need a product safety data sheet on Dynomax part number 289-41537
     
  2. Macrobb

    Macrobb Full Access Member

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    Well, erm, you are getting pretty close to the glowing point of steel.
    You should probably think about a double-walled setup, like they use for stoves. That would give you a hot layer of steel on the inside which might glow(but you couldn't see it), protected by a layer of insulation and then an outer layer of steel.

    Diesel exhaust pipe is nothing special, and honestly it doesn't get that hot. You might have 1200F gasses pre-turbo, but the piping is much colder than that due to convection to the outside.
     
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  3. OLDBULL8

    OLDBULL8 Good Morning Ya'll. Supporting Member

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    What gauge is the exhaust connection?

    What BTU is the furnace?

    That exhaust gas temp you quote seems awful high, that's a lot of heat loss for a furnace, most furnaces emit around 200 to 300 degree exhaust.
     
  4. Boston

    Boston Full Access Member

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    Furnace is 85,000 BTUs/hr and the gauge is 16.

    I just need to know the cycle life of the material when the temp ranges from say 700~800 to ambient. I haven't had time to contact the manufacturer. I'm sure they have some tests I can look at.

    OH and it's a heat exchanger that's specifically designed to be part of the combustion area. Most furnaces have a forced air vertical leaf type arrangement. Mine uses no electricity, has no moving parts and much of the burn occurs in a semi vertical heat exchanger, which is made of this type of tubing I'm looking for specs on.

    I'm working on a design for off grid living, tiny homes, people who want to build in areas where typical utilities are prohibitively pricey.

    I'll just contact the manufacturer since it's a weekday now,
     

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