ThePottery@AOL.COM on tue 18 dec 01
Gregg...I have been using commercial grade double walled stainless steel pipe
for a couple of years for schools and my self. I have checked my 100 cu ft
production car kiln for the temperature of the top of the 10 foot 9x9 2300
softbrick chimney at cone 10. Top temperature is about 750 F. The
commercial pipe is rated at about 1500 F continuos use. The cost of the pipe
is about the same as new 2300 brick per foot height. Have your architect
check this out. Right now I have a double wall stainless steel pipe on soft
brick with a fiber blanket gasket for a smaller 50 cu ft kiln for a 9x9
chimney. The pipe starts 5 feet above the flu and extends above the roof of
my 2 story building. After two years of firing about every three weeks there
is some discoloration on the first 4 inches of the pipe. Hope this helps.
Tracy
The Potter
Tracy Dotson
Penland NC
Kathi LeSueur on sun 26 jan 03
I must say that every time there is a discussion about chimneys I'm
glad I live in Ann Arbor and learned to build a kiln without one. I
doubt there's a gas kiln in Ann Arbor with a chimney. The JT Abernathy
design, which we've all copied and modified, has been discussed here
before. It requires forced air burners (two at the bottom front, two mid
high back), no bag wall (just seven inches around the shelves), and vent
by leaving out three brick from the middle of the bottom of the door.
Simplicity. Mine is a half cone difference from middle (hottest) to top
and bottom. Consistant, fires on the same gas pressure coming into my house.
Kathi
claybair on mon 27 jan 03
Wow... read about this kiln!
Gayle Bair
Bainbridge Island, WA
http://claybair.com
-----Original Message-----
From: Clayart [mailto:CLAYART@LSV.CERAMICS.ORG]On Behalf Of Kathi
LeSueur
Sent: Sunday, January 26, 2003 6:04 PM
To: CLAYART@LSV.CERAMICS.ORG
Subject: chimney
I must say that every time there is a discussion about chimneys I'm
glad I live in Ann Arbor and learned to build a kiln without one. I
doubt there's a gas kiln in Ann Arbor with a chimney. The JT Abernathy
design, which we've all copied and modified, has been discussed here
before. It requires forced air burners (two at the bottom front, two mid
high back), no bag wall (just seven inches around the shelves), and vent
by leaving out three brick from the middle of the bottom of the door.
Simplicity. Mine is a half cone difference from middle (hottest) to top
and bottom. Consistant, fires on the same gas pressure coming into my house.
Kathi
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Michael McDowell on tue 7 dec 10
Lee Love wrote:
"I fired Craig's Alpine updraft last week, with no chimney, only a
hood. It fired itself and was completely even, top to bottom.
Maybe a chimney isn't necessary on a gas or oil kiln."
I remember this discussion leading to a very vituperative exchange here on
Clayart years ago. Ellen Baker, a potter of limited experience with
different kiln designs took this position, that a chimney is unnecessary,
based on her experience with updraft kilns. It is true that no chimney is
required to establish a proper draw in a kiln of updraft design. The chimne=
y
is only required if your kiln is a downdraft kiln. Apparently, you are
unfamiliar with downdraft kilns. You can take it for granted that any
discussion of chimneys on a kiln is making reference to a kiln of downdraft
design. If you have no experience in that area, you have little to add to
the discussion.
I fire both types of kiln, both evenly from top to bottom, and I have even
extended my 36" diameter Updraft to 36" in height by adding a couple of 4
1/2" blank rings. Still, I wouldn't fire my downdraft without a chimney.
It's not the type of fuel, it's the design of the kiln.
Michael McDowell
Whatcom County, WA, USA
michael@mcdowellpottery.com
http://www.McDowellPottery.com
mel jacobson on tue 7 dec 10
my post keeps getting rejected,
you would think i could fix that.
here is a good idea for a chimney, and
it is very inexpensive...posted many times before.
get a piece of spiral pipe, add kaowool liners.
works like a charm, and your spouse can hand
you a 12 foot piece with two hands while you are
on the roof.
used brick a chimney does not make...ick.
loose, air leaks, tippy.
build your chimney with hard brick up two feet +.
add damper slot.
squish in to 28-35 square inches. add spiral pipe
as high as you need.
i dip my liners in itc100 and they squish together to
make a one piece liner.
gengis khad had a brick chimney...we can do
better in 2010.
mel
from: minnetonka, mn
website: http://www.visi.com/~melpots/
clayart link: http://www.visi.com/~melpots/clayart.html
new book: http://www.21stcenturykilns.com
alternate: melpots7575@gmail.com
Lee Love on tue 7 dec 10
I fired Craig's Alpine updraft last week, with no chimney, only a
hood. It fired itself and was completely even, top to bottom.
Maybe a chimney isn't necessary on a gas or oil kiln.
I stopped in Continental and talked to Mike about burners to
put under an old electric conversion. He said he had a used Olympic
Torchbear in the back for sale that had burners he could order for me.
I asked the price. The price and condition were good (was only
fired 3 times.) So I'm going to buy it. Comes with hood and
furniture too. I'll put it in its own metal shed. Pour a slab in
the spring for it.
.
It is a 2827 like at the link below:
http://www.axner.com/olympicmodel2827gkilnshipsmfg.aspx
--
=3DA0Lee, a Mashiko potter in Minneapolis
http://mingeisota.blogspot.com/
=3D93Observe the wonders as they occur around you. Don't claim them. Feel
the artistry moving through and be silent.=3D94 --Rumi
Lee Love on wed 8 dec 10
On Wed, Dec 8, 2010 at 1:35 AM, Michael McDowell
wrote:
> Lee Love wrote:
>
> "I fired Craig's Alpine updraft last week, with no chimney, only a
> hood. =3DA0 It fired itself and was completely even, top to bottom.
>
> =3DA0 =3DA0 =3DA0 Maybe a chimney isn't necessary on a gas or oil kiln."
Michael,
You miss the point. Maybe downdraft is not necessary in a
short flame fueled kiln.
--
=3DA0Lee, a Mashiko potter in Minneapolis
http://mingeisota.blogspot.com/
=3D93Observe the wonders as they occur around you. Don't claim them. Feel
the artistry moving through and be silent.=3D94 --Rumi
Michael McDowell on wed 8 dec 10
Lee Love writes:
"If you had a modicum of experience firing any type of woodkiln,
you'd know how chimneys are much more important with them.
If you had broader experience, you'd know that forced air burners are
more forgiving."
You make good points Lee. In my experience all wood kilns are of natural
draft and downdraft in design. But I don't believe that it would be
impossible to design a wood firing kiln to fire updraft or to use forced
air. Perhaps someone on this list has experience of such a kiln and could
trump us both with their greater experience.
Chimneys are still integral, and necessary to the function of natural draft=
,
downdraft kilns.
Michael McDowell
Whatcom County, WA, USA
michael@mcdowellpottery.com
http://www.McDowellPottery.com
Lee Love on wed 8 dec 10
Most kilns we call downdraft are actually cross draft. A downdraft
kiln has the exit flue lower than the burner ports. My woodkiln was
set up this way. Factory kilns in Japan have the exit flues going
into the bed of the car, making their exit lower than the burner
ports.
--
=3DA0Lee, a Mashiko potter in Minneapolis
http://mingeisota.blogspot.com/
=3D93Observe the wonders as they occur around you. Don't claim them. Feel
the artistry moving through and be silent.=3D94 --Rumi
Steve Mills on wed 8 dec 10
As an addition to this thread; my small commercially made Downdraught Gas K=
i=3D
ln, fired at very low pressure (InH2O not PSI), has no external Flue and do=
e=3D
sn't need one. It draws beautifully!
Steve M
Steve Mills
Bath
UK
On 8 Dec 2010, at 16:10, Lee Love wrote:
> On Wed, Dec 8, 2010 at 1:35 AM, Michael McDowell
> wrote:
>> Lee Love wrote:
>>=3D20
>> "I fired Craig's Alpine updraft last week, with no chimney, only a
>> hood. It fired itself and was completely even, top to bottom.
>>=3D20
>> Maybe a chimney isn't necessary on a gas or oil kiln."
>=3D20
> Michael,
>=3D20
> You miss the point. Maybe downdraft is not necessary in a
> short flame fueled kiln.
>=3D20
>=3D20
> --
> Lee, a Mashiko potter in Minneapolis
> http://mingeisota.blogspot.com/
>=3D20
> =3DE2=3D80=3D9CObserve the wonders as they occur around you. Don't claim =
them. Fe=3D
el
> the artistry moving through and be silent.=3DE2=3D80=3D9D --Rumi
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