mel jacobson on mon 3 oct 11
i think a great deal has to do with the size of flue
and keeping the heat in the kiln, not up the stack.
how many kilns are out there with 81 sq. inch flues?
lots. the kiln can hardly keep up with the escaping heat.
long firings that do not go anywhere are sure
`sky firing kilns`.
i had some face time with donovan palmquist
the other day...and he was having problems with
his own kiln. fairly small salt kiln...and it was
doing like 18 hours.
it was all about his flame brick....he took it out
as it was diverting the flame right back out the
flue.
so, in, around and up the stack. it was not heating
the kiln.
i have seen this before.
he took out the brick on both sides and took 5 hours off the firing.
and for salt, what does one need with long firings?...bend the cone
and salt.
i am sure he would love to get that kiln to 8 hours.
and, he knows a thing or two about kilns and building kilns.
mel
from: minnetonka, mn
website: http://www.visi.com/~melpots/
clayart link: http://www.visi.com/~melpots/clayart.html
Steve Mills on tue 4 oct 11
We had one like that that a customer was having problems with; well known d=
e=3D
sign, long firing, getting nowhere.=3D20
I eventually persuaded them to let me visit. I noticed that tree branches =
a=3D
long way above the flue were scorched The kiln was heating up the chimne=
y=3D
not the chamber. Took a load of bricks out of the bottom of the stack to m=
a=3D
ke passive dampers. Cured it!!
Steve M
Steve Mills
Bath
UK
www.mudslinger.me.uk
Sent from my Ipod touch
On 3 Oct 2011, at 22:50, mel jacobson wrote:
> i think a great deal has to do with the size of flue
> and keeping the heat in the kiln, not up the stack.
> how many kilns are out there with 81 sq. inch flues?
> lots. the kiln can hardly keep up with the escaping heat.
>=3D20
> long firings that do not go anywhere are sure
> `sky firing kilns`.
>=3D20
> i had some face time with donovan palmquist
> the other day...and he was having problems with
> his own kiln. fairly small salt kiln...and it was
> doing like 18 hours.
> it was all about his flame brick....he took it out
> as it was diverting the flame right back out the
> flue.
> so, in, around and up the stack. it was not heating
> the kiln.
> i have seen this before.
>=3D20
> he took out the brick on both sides and took 5 hours off the firing.
> and for salt, what does one need with long firings?...bend the cone
> and salt.
> i am sure he would love to get that kiln to 8 hours.
> and, he knows a thing or two about kilns and building kilns.
> mel
> from: minnetonka, mn
> website: http://www.visi.com/~melpots/
> clayart link: http://www.visi.com/~melpots/clayart.html
Ron Roy on tue 4 oct 11
Hi Steve,
Had two passive dampers on mine - adjustable - worked well.
Some kilns fire slow because they are underpowered - I had to do that
to fit into local regulations - costs were not excessive - just took
more time and firings were even - no losses - every kiln id different.
RR
Quoting Steve Mills :
> We had one like that that a customer was having problems with; well
> known design, long firing, getting nowhere.
> I eventually persuaded them to let me visit. I noticed that tree
> branches a long way above the flue were scorched The kiln was
> heating up the chimney not the chamber. Took a load of bricks out of
> the bottom of the stack to make passive dampers. Cured it!!
>
> Steve M
Steve Mills on wed 5 oct 11
Dear Ron,
My last production kiln had them as well.=3D20
Because it was in basement (with street access!) and the stack had to clear=
t=3D
he roofline by several feet to comply with building regulations this made i=
t=3D
very tall.=3D20
I used to take six bricks out of the chimney base and take the cover off th=
e=3D
transfer box to get a reduction.=3D20
The big plus was that unlike having to control it by constantly adjusting a=
p=3D
late damper and the gas, once set, I could leave it alone for about six hou=
r=3D
s; it just motored up un-aided and all I had to do was wait for the cones t=
o=3D
fall.=3D20
That was a brilliant kiln.=3D20
Take care
Steve M
Steve Mills
Bath
UK
www.mudslinger.me.uk
Sent from my Ipod touch
On 4 Oct 2011, at 23:33, ronroy@ca.inter.net wrote:
> Hi Steve,
>=3D20
> Had two passive dampers on mine - adjustable - worked well.
>=3D20
> Some kilns fire slow because they are underpowered - I had to do that to =
f=3D
it into local regulations - costs were not excessive - just took more time =
a=3D
nd firings were even - no losses - every kiln id different.
>=3D20
> RR
>=3D20
>=3D20
> Quoting Steve Mills :
>=3D20
>> We had one like that that a customer was having problems with; well know=
n=3D
design, long firing, getting nowhere.
>> I eventually persuaded them to let me visit. I noticed that tree branch=
e=3D
s a long way above the flue were scorched The kiln was heating up the chi=
m=3D
ney not the chamber. Took a load of bricks out of the bottom of the stack t=
o=3D
make passive dampers. Cured it!!
>>=3D20
>> Steve M
>=3D20
>=3D20
| |
|
