John Baisch on sun 8 sep 96
The new kiln blues...
I decided yesterday to build a new raku kiln...
I made a fibre chamber 24" inside diameter 24" high..
My torch entry way is approx. 4" top flue approx 5" in diameter
Propane tank 20Lb, 8oz regulator.
I can only reach 1400" (After two hours)
Help Help Help,,,,
I used the same burner system to fire my Garbage can kiln
with no problems (1800F in 35 mins)
I need to get this baby working by monday night...
Any and all suggestions greatly appreciated..
JB
chull@startext.net on mon 9 sep 96
My guess is that it is not getting enough air. Either adjust the burner
or enlarge the entry port. I had that problem after I moved my kiln and
restackied the bricks making the port too small.
Cynthia
TX
John Baisch wrote:
>
> ----------------------------Original message----------------------------
> The new kiln blues...
>
> I decided yesterday to build a new raku kiln...
>
> I made a fibre chamber 24" inside diameter 24" high..
> My torch entry way is approx. 4" top flue approx 5" in diameter
> Propane tank 20Lb, 8oz regulator.
>
> I can only reach 1400" (After two hours)
>
> Help Help Help,,,,
>
> I used the same burner system to fire my Garbage can kiln
> with no problems (1800F in 35 mins)
>
> I need to get this baby working by monday night...
>
> Any and all suggestions greatly appreciated..
>
> JB
Bob Hanlin on mon 9 sep 96
>----------------------------Original message----------------------------
>The new kiln blues...
>
>I decided yesterday to build a new raku kiln...
>
>I made a fibre chamber 24" inside diameter 24" high..
>My torch entry way is approx. 4" top flue approx 5" in diameter
>Propane tank 20Lb, 8oz regulator.
>
>I can only reach 1400" (After two hours)
>
>Help Help Help,,,,
>
>I used the same burner system to fire my Garbage can kiln
>with no problems (1800F in 35 mins)
>
>I need to get this baby working by monday night...
>
>Any and all suggestions greatly appreciated..
>
>JB
JB
Try putting some sort of stack on the baby. Just a piece of flue pipe
will work.
BobH
Marcia Selsor on mon 9 sep 96
Is your torch allowing the entry of secondary air? You might need to pull
the torch out a little to pull in more secondary air to aid with combustion.
-Marcia in Montana
mjbmls@imt.net
lrh on mon 9 sep 96
I'd suggest you check to see if you are firing in oxidation or reduction
before you make any changes...check the flame at the exhaust port...if
it's orange you need to enlarge the exhaust opening...if flame is
nonexistant, partialy cover the exhaust opening with a piece of kaowool
or brick.
The rate of temp rise is very sensitive to the two openings in the can. If
enlarging the lid opening does't do the trick, enlarge the burner opening as
well. .LRH
______________________________ Reply Separator _________________________________
Subject: Re: Help! Raku Kiln Blues...
Author: Ceramic Arts Discussion List at ccmgate
Date: 9/9/96 8:56 AM
----------------------------Original message----------------------------
>----------------------------Original message----------------------------
>The new kiln blues...
>
>I decided yesterday to build a new raku kiln...
>
>I made a fibre chamber 24" inside diameter 24" high..
>My torch entry way is approx. 4" top flue approx 5" in diameter
>Propane tank 20Lb, 8oz regulator.
>
>I can only reach 1400" (After two hours)
>
>Help Help Help,,,,
>
>I used the same burner system to fire my Garbage can kiln
>with no problems (1800F in 35 mins)
>
>I need to get this baby working by monday night...
>
>Any and all suggestions greatly appreciated..
>
>JB
JB
Try putting some sort of stack on the baby. Just a piece of flue pipe
will work.
BobH
Keith Chervenak on mon 9 sep 96
John,
Did you calculate the btu's necessary for your new kiln? Can your
burner deliver these? You have probably increased the cubic feet over the
garbage can kiln and the burner just can't handle it. I would suggest a
second burner and probably increasing the size of your propane tank.
Branfman's "Raku: A Practical Approach" book has an easy formula to figure
your btu requirements in relation to size as well as kiln material,ie.
brick and fiber. I recommend a look, you may be surprised at how rapidly
you can expand cubic feet and how many more btu's are then required. Good
luck-
Keith
Keith Chervenak
kac2@po.cwru.edu
Case Western Reserve University
Cleveland, Ohio U.S.A.
Elaine J. Walters on mon 9 sep 96
------ =_NextPart_000_01BB9E40.69E484A0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 8BIT
John, I had a similar problem. My kiln is approx. the same size as yours. I
changed from a small tank to a 50 gal tank and was getting nowhere. Thanks to
help from ClayArters I enlarged my flue opening. I adjust it with a brokenkiln
shelf. My opening is probably two inches bigger than my burner port. I also
pull the burner out of port about l l/2" after 15 min. I am now firing up to
1800-1850 in 25-30 min ,sometimes less depending on the wind. My colors are a
lot better too. Hope this helps! Elaine, on Camano Island.
----------
From: John Baisch[SMTP:jbaisch@micron.net]
Sent: Sunday, September 08, 1996 8:08 PM
To: Multiple recipients of list CLAYART
Subject: Help! Raku Kiln Blues...
----------------------------Original message----------------------------
The new kiln blues...
I decided yesterday to build a new raku kiln...
I made a fibre chamber 24" inside diameter 24" high..
My torch entry way is approx. 4" top flue approx 5" in diameter
Propane tank 20Lb, 8oz regulator.
I can only reach 1400" (After two hours)
Help Help Help,,,,
I used the same burner system to fire my Garbage can kiln
with no problems (1800F in 35 mins)
I need to get this baby working by monday night...
Any and all suggestions greatly appreciated..
JB
------ =_NextPart_000_01BB9E40.69E484A0
Content-Type: application/ms-tnef
Content-Transfer-Encoding: base64
eJ8+IjkSAQaQCAAEAAAAAAABAAEAAQeQBgAIAAAA5AQAAAAAAADoAAENgAQAAgAAAAIAAgABBJAG
ACwBAAABAAAADAAAAAMAADADAAAACwAPDgAAAAACAf8PAQAAAE4AAAAAAAAAgSsfpL6jEBmdbgDd
AQ9UAgAAAABDZXJhbWljIEFydHMgRGlzY3Vzc2lvbiBMaXN0AFNNVFAAQ0xBWUFSVEBMU1YuVUtZ
LkVEVQAAAB4AAjABAAAABQAAAFNNVFAAAAAAHgADMAEAAAAUAAAAQ0xBWUFSVEBMU1YuVUtZLkVE
VQADABUMAQAAAAMA/g8GAAAAHgABMAEAAAAfAAAAJ0NlcmFtaWMgQXJ0cyBEaXNjdXNzaW9uIExp
c3QnAAACAQswAQAAABkAAABTTVRQOkNMQVlBUlRATFNWLlVLWS5FRFUAAAAAAwAAOQAAAAALAEA6
AQAAAAIB9g8BAAAABAAAAAAAAAM6NQEIgAcAGAAAAElQTS5NaWNyb3NvZnQgTWFpbC5Ob3RlADEI
AQSAAQAdAAAAUkU6IEhlbHAhIFJha3UgS2lsbiBCbHVlcy4uLgChCAEFgAMADgAAAMwHCQAJAAsA
DwALAAEACwEBIIADAA4AAADMBwkACQALAAkAEwABAA0BAQmAAQAhAAAAQjFFNzJGOUYyQzBBRDAx
MUJFMkQ0NDQ1NTM1NDAwMDAAAQcBA5AGACwGAAASAAAACwAjAAAAAAADACYAAAAAAAsAKQAAAAAA
AwA2AAAAAABAADkAYAdP13qeuwEeAHAAAQAAAB0AAABSRTogSGVscCEgUmFrdSBLaWxuIEJsdWVz
Li4uAAAAAAIBcQABAAAAFgAAAAG7nnrW+58v57IKLBHQvi1ERVNUAAAAAB4AHgwBAAAABQAAAFNN
VFAAAAAAHgAfDAEAAAASAAAAZXdhbHRAd2hpZGJleS5uZXQAAAADAAYQNjaDagMABxDhAwAAHgAI
EAEAAABlAAAASk9ITixJSEFEQVNJTUlMQVJQUk9CTEVNTVlLSUxOSVNBUFBST1hUSEVTQU1FU0la
RUFTWU9VUlNJQ0hBTkdFREZST01BU01BTExUQU5LVE9BNTBHQUxUQU5LQU5EV0FTR0VUVAAAAAAC
AQkQAQAAAKkEAAClBAAA4QcAAExaRnVq2piv/wAKAQ8CFQKoBesCgwBQAvIJAgBjaArAc2V0MjcG
AAbDAoMyA8UCAHByQnER4nN0ZW0CgzN3AuQHEwKAfQqACM8J2TvxFg8yNTUCgAqBDbELYOBuZzEw
MxRQCwoUUQUL8mMAQCBKb2huICwgIEkgEYBkIHRhIACQbQMQCsETUG8LAmAT4C4bQE15IGuvAxAD
oAQAG7BwHGF4HNBodGhlG9BhB4Ab0XrVHlBhBCB5CGFzHNEbYHcRcRkQCYAgA1IbsgDAbFMDIAGQ
bmseIG8bsTV4MCBnB0AhJABwG6B3Dx8RICACQAuAZyBub653HkAWEBzQVB/xawQgUyGBHkBscCBU
QwtgeX8HEBPQEaAbUQnwHCEgIm3HHRAY4ApQIG9wCfAjUfMfkxuQanUTwB1wBUAD8GseMBuxYgNg
awnwHTNzfSTBZhzUJ0UdchxiAaBseR0QdHchkAuAEXAHkWJ8aWcgIAXAHjADkSbBYjUIcG4soXAV
sSe0bHP5IZBwdSECHkEtVQhgBUB8b2YtsxuwBuAvsQMgbDgvMiIbsAGALKExNb8msAuAJ7QgkCOR
IFBpBRANI2F1JPAhgTE4MDAuLTOAIdELgCAYQC0z9yHgMcEbQCwucAeAI0AHgu8coAQRDbAnUWQj
UgIgHiP/A/AioBzUFYMdkRYQG7EVoE0FQGIjISyib28c0UhPJ0EeIR2BJMJzIRtARe0LYmUbMDah
Qx6AAHAhkDxJcxjxN0AKhQqLbGnLM4ICAGkzwDQ0DfAM0HM+IwtZMTYKoANgE9BjfQVALUBHCoc+
+wwwP8ZGPQNhOkFOP8YMghrjIEIDC3AE8GhbU01UUOw6aitQRXJAHAAFAAIg8i4tgHRdQO9B/QZg
AjDzQy9EO1N1IqAlgBswBmBPBTAT4DjABcAwOBswMUA5OTYgODpMgCDMUE1HT0H9VG9Jj0Q7vk0u
sCNAC1AeUBYQYwUgPwiQAjAEIC/hPYAoQUNMYEFZQVJUTY9IXnXcYmpAAU+vRDtIJNE6gEBSYWt1
IEsdQkKfCkEfgFlQPE89UzM2PsevGkU/z10PQEBPBRBnC4D/IhEHgR5wICBdP1/5CoUkIP8eUC2A
B+AdMwoyWU8bUQWB9mkNsBugeQeQJcFLkSFy7y1QAxAbomGyclhyHTJin/8bYADADbAbsTKwKRAe
UBFx+UwzMjQxEAuAAJBnsTZQzx6BMVJo4jnwZ2hZZx0BzSGAchFwJiF0ch0QItD/HRAdiWjxIYAk
8ScCHbQhwPdpAmmHCoVQA2AKsC2AISSJAdBMYhsxOG96UgHaZy6wYWthZo9jA5ECIH8rgRYQANAo
0D4gM6AxECjWQTFDK7JoH1IpWYxYAv116Cx20WLOKDAgMR43LVW+cxOzIXIysR5QJsFHCsD/K1Ag
IHKjHTIKhSijO6EcZdcEIHPwM4JGNBIzMaN0/v8bYC2AeDIhkCMROdQrUWwB/wWwHTAjYYBhBGBL
giOAanFzLfBZbkFuHRAikiDyc3Z1LIETwGkCICLxc0F0PyuBHbJSIXFgCYBZbkpCv1mMWf9bD1wV
CoUVMQCLAAAAAAMAEBAAAAAAAwAREAAAAABAAAcwIKBkBXqeuwFAAAgwIKBkBXqeuwEeAD0AAQAA
AAUAAABSRTogAAAAAI7K
------ =_NextPart_000_01BB9E40.69E484A0--
WardBurner@aol.com on mon 9 sep 96
JB,
There are many variables involved in these kind of problems. Believe it or
not, too many to list. I can solve your problem, maybe by tonight, maybe not,
but I would need you to call me so I can ask you some questions. Feel free to
call.
Marc Ward
Ward Burner Systems
PO Box 333
Dandridge, TN 37725
USA
423.397.2914 voice
423.397.1253 fax
wardburner@aol.com
ZALT@aol.com on tue 10 sep 96
I don't know if raku kilns can be compared to gas kilns. From my reading I
believe that the exit flue must be the same area as the entrance flue. Try
it, it might work.
Terry Lazaroff
Talbott on tue 10 sep 96
Probably just backing the burner back 3" or so from the burner port will
solve your problem..You could have been firing in reduction and allowing
more oxygen to combine with the propane will put you into oxidation and
your temps should climb..let us know--Marshall
| |
|
