#11  
Old 08-24-2010, 05:06 AM
Serf
 
Join Date: Aug 2010
Location: George, South Africa
Posts: 11
Default Re: Greetings from South Africa!

Thanks for the advice...

Will a wall thickness of 50mm refractory cement be enough?
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  #12  
Old 08-24-2010, 05:37 AM
Laborer
 
Join Date: Jan 2008
Location: Melbourne, Australia
Posts: 65
Default Re: Greetings from South Africa!

We made nine ovens all with a thickness of 70mm - 80mm. It was one of my biggest points of concern. You have to weigh up the time it takes to heat up, the amount of heat you want to hold and how strong you want the refractory. All the advice I got from suppliers was that 75mm was a better bet than 50mm (strength wise).

As for the amount of heat that the refractory can store - it takes my oven about 1hr 45 mins to come to temp. but it can hold baking temperatures (250 down to 150 Celcius) for two days.



Hope that helps.

Cheers for now.
Mr G.
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  #13  
Old 08-27-2010, 04:49 AM
Serf
 
Join Date: Aug 2010
Location: George, South Africa
Posts: 11
Default Re: Greetings from South Africa!

Hi Mr. G.

our refractory cement comes in 25 kg bags and according to the manufacturer
can handle about a 1600 deg.

Would this be ok an how many bags would I need?


Thanks
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  #14  
Old 08-27-2010, 04:58 AM
Serf
 
Join Date: Aug 2010
Location: George, South Africa
Posts: 11
Default Re: Greetings from South Africa!

Ok just read in your thread that you used 12 - 13 bags
my wall thickness will be slightly thinner so I should use a bit less.....
either way just ordered 13 bags .....Whoa driving a 1000km George - Cape town and back to pick them up....There goes the savings acount! Yeah!
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  #15  
Old 08-27-2010, 05:25 AM
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Default Re: Greetings from South Africa!

Renier, sorry to come in to this late, but I would also recommend a rebate or reveal. If your going to mass produce this it adds a lot to the oven. Even if it's just for yourself, it's nice to have for the door to fit tight into. The rebate outside the flue does nothing for you.
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  #16  
Old 08-27-2010, 05:49 AM
Laborer
 
Join Date: Jan 2008
Location: Melbourne, Australia
Posts: 65
Default Re: Greetings from South Africa!

Hi Renier, the refractory that I used was rated at 1350 - 1450 Deg Celcius.

Good luck, and keep the photos coming.

Cheers for now.
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