Brick oven reconstructed to a steel one

[stonecutter]

Re: Brick oven reconstructed to a steel one

G'day
Sorry for the late reply
Weren't we discussing the mortar mix? I was wondering if the constant use oven could have different mortar as it was subject to lowere level of thermal shocks than our weekender ovens?
Regards dave

Yes we are, but I wasn't sure what you meant specifically....there's more than one or two things to consider with any mix design and application.

As far as a consistent temperature threshold having a more positive effect on the mortar, that depends on the design make up. Type of aggregate, ratios of refractory material vs thermally resistant matter, etc etc...lots of variables. High consistent temps can degrade mortar strength just like heat cycling can.

[v12spirit]

Re: Brick oven reconstructed to a steel one

Hi guys,

Eventually, found a reliable iron fabricator. Using traditional construction techniques and materials, he started applying the cardboard model for steel..

Drawing the cuts:


Cutting the hearth:



Hearth cut:

[v12spirit]

Re: Brick oven reconstructed to a steel one

I'll be posting gradually cause the machine is slower at uploading than downloading..

Cutting side walls (3 identical repeated cuts):


One sidewall cut:


Side wall before twisting:


Twisting one sidewall:


Sidewall twisted:

[v12spirit]

Re: Brick oven reconstructed to a steel one

Continuing with the sidewalls..


Sidewalls integrated and welded:


Refining the welds:


Installing the dome:


Dome installed and welded:


Refining dome welds:

[v12spirit]

Re: Brick oven reconstructed to a steel one

Venting..

Ready to vent:



drawing the vent:


Cutting the vent:

[cobblerdave]

Re: Brick oven reconstructed to a steel one

G'day V 12
Good to watch your dome coming together after all you planing.
Question : is you vent going to squirrel tale?
Regards Dave

[v12spirit]

Re: Brick oven reconstructed to a steel one

Yes it is Dave. Actually it was compelling in my case to squirrel-tail the vent, and that is what I did. I didn't, however use the technique of making the flu land on top of the dome being using a more flexible construction material -steel, I made the flu "fly" over the dome, as IMHO this is more efficient with respect to insulation.

Vent construction:


Squirrel-tailing flu "neck":


Refining the flu for better air flow:


A belt-like strip of steel was used to make the side walls of the vent:


Vent sidewalls integrated:

[v12spirit]

Re: Brick oven reconstructed to a steel one

Enclosing the vent

The outer arch that encloses the vent is lower than the inner opening arch by 0.5 cm, I was trying to impede smoke leakage out of the opening by doing that. The distance between the outer arch and the inner arch is 7 cm, this was being optimized for better air flow yet better possible visibility as well as design compaction.

[v12spirit]

Re: Brick oven reconstructed to a steel one

Enclosing the vent


The ends of the sidewalls of the vent are welded together at the bottom to constrain any possible (maybe heat consequent) twists. This was done using the remains of the hearth cuts:



Oven finished:

[david s]

Re: Brick oven reconstructed to a steel one

That bit of flue pipe looks far too horizontal for my liking. It may cause excessive smoking at start up.

[v12spirit]

Re: Brick oven reconstructed to a steel one

I agree with you, but the stove inside my home has a horizontal flu length of 150 cm being far from the walls and it is running fine, I will make myself optimistic by that fact. Moreover, the oven is an indoor one, so I'm limited with some aesthetic considerations, not to mention the turbo ventilating fan that I provided at the end of the flu in order to "super charge" the flu and eliminate any hesitant air draw. For the time being I'll keep being optimistic and hope the flu will be "naturally aspirated" so I don't even need to run the fan. I'll tell you when I run the first fire how the venting operates.

[david s]

Re: Brick oven reconstructed to a steel one

Ok, with an extractor fan, I'm sure it will work fine. You will probably only need it at start up. I think your oven will work fine. Looking forward to seeing it finished and performing.

[v12spirit]

Re: Brick oven reconstructed to a steel one

This may sound a silly question, but does steel need curing? I mean in order for the welds to cope with high temperatures, do I need a week of gradually increased temperatures as in brick ovens, or can I just run it quite hot for the first time?

[david s]

Re: Brick oven reconstructed to a steel one

No curing required for your steel oven. Actually curing is not a good name for this process. I prefer to call it driving out the water. "Curing" can get people confused with the curing of concrete products that require quite the opposite i.e. the holding in of the moisture to enhance strength.

[v12spirit]

Re: Brick oven reconstructed to a steel one

Two venting approaches:



Does the second make a SIGNIFICANT difference to airflow?
It makes a significant aesthetic difference to me, but I'm ready to compromise in case a significantly better airflow is achieved by that in case the extractor fan fails.
What do you guys think?