Oven number two..

[brickie in oz]

Re: Oven number two..

carbon burns off at around 300 C

I thought it was 600c?

[BeanAnimal]

Re: Oven number two..

Just a quick safety note.
I have a full face helmet that draws air in and blows it down your face after filtering it twice down to 2 micron.

Similar to this one (just an older version)


But after a few hours on a wet saw I could feel my nose getting crusty from the dust, a paper mask just wont do.

The helmets are made by 3M Racal and called "airstream" helmets. The most common use here in the States is in longwall coal mining. The longwall shearer operator, shieldman and helpers usually wear them due to the high levels of respirable dust. Pretty cool, but very spendy!

[david s]

Re: Oven number two..

In this pic you can see the cold spots where the carbon hasnt burnt off at 600c.

There will be cold spots at the back corners and towards the front, cold as in less then 600c.

The flue is middle front of pic.

I am a bit mystified as to why there is unburnt carbon in your oven at such high temps. From my experience the carbon burns off at around 300 C although in a new and wet oven the bottom of the dome (in a hemisphere) may be still black and relatively cool while the top is really hot. Carbon below the surface takes a lot longer to burn away as well. Infrared measuring equipment measures the temp of the surface and may give you a rather misleading (high) reading. Also the corners in your oven will be thicker than the rest of the walls and may contribute to cool spots until the oven is soaked. It will be interesting to see if your oven achieves more even heating after about 10 firings. Proceed with caution to be kind to your refractory.

[brickie in oz]

Re: Oven number two..

I can get a thermal reading from the back of the oven and the outside of the 1" ceramic blanket reads 66c while the oven is at 300c.

Great stuff or what?

[brickie in oz]

Re: Oven number two..

Heat Break.
And if it worked or not?

http://www.fornobravo.com/forum/f28/...tml#post110456

[brickie in oz]

Re: Oven number two..

Oppps didnt see the month right ... April????

Do we vault'ers need that long to cure?

Mine is 99% cured.
There is a thread somewhere on here about curing.

[gummz]

Re: Oven number two..

Oppps didnt see the month right ... April????

Do we vault'ers need that long to cure?

[gummz]

Re: Oven number two..

Brickie,

Another Question. Is your chimney entrance inside you dome area??
What are the benefits of having it inside and how does it perform???

Have an awesome time @ the pizza party~!!!!!!!!


Cheers,

Gummz

[brickie in oz]

Re: Oven number two..

The oven is now finished, I finished the roof and added the extra vermiculite and now have about 300mm of loose vermiculite over the top of the oven.

Party time. Canceled due to bad date timing.

[brickie in oz]

Re: Oven number two..

I started doing the roof today, its a ply base with asphalt roof tiles.
The oven now reminds me of a gingerbread house.
Im sure Hanse and Gretel will show up shortly..

Ive only done 1 side, the weather side as I have to add more vermiculite and still need access, all up I will have used 900 litres of the stuff.

The ply is FormPly used for concrete work, when you get it make sure its the Australian type as the Chinese rubbish rots, Ive never before seen FormPly rot until I used the Chinese stuff..

[brickie in oz]

Re: Oven number two..

No chicken wire, the blanket stays where you put it, even vertically.

[gummz]

Re: Oven number two..

Hi Brickie,

Can you let us all know how the 1" + loose vermiculite combination goes,,

I'll be up to that stage soon and i was thinking the same thing.

Also did you "press down" the banket with chicken wire?? or will those blankets stay in place?

Cheers,

Gummz

[brickie in oz]

Re: Oven number two..

Night view after the lights have been installed.

[brickie in oz]

Re: Oven number two..

In this pic you can see the cold spots where the carbon hasnt burnt off at 600c.

There will be cold spots at the back corners and towards the front, cold as in less then 600c.

The flue is middle front of pic.

[brickie in oz]

Re: Oven number two..

Ive given it a good fire and got to 600c, this oven burns beautifully.

I have added 500 litres of loose vermiculite over the top and down the sides but I think I will need more to get more cover over the top of the oven.

I need a Gargoyle for the top of the oven in front of the chimney.