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postalpotter

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  1. Would an ocarinas or a flute be considered a toy? How about whistles?
  2. postalpotter

    How much propane will I use

    Say Linda A if your as unfamiliar with this gas kiln process as I am then perhaps you might check out July/Aug contribution in Pottery Making Illustrated by Steve Davis on bisque firing. Maybe you have? I wish it had been in the last issue!
  3. postalpotter

    How much propane will I use

    I wish I was as efficient!
  4. postalpotter

    How much propane will I use

    Is jealously a virtue?
  5. postalpotter

    How much propane will I use

    That gas valve looks open to me?
  6. postalpotter

    How much propane will I use

    I learned how to work the damper. The slightest adjustment would cause the temps to rise, stall or fall, with no increase or decrease in gas. Have much much much to learn this is my first rodeo. That was my first firing ever! Will do my first bisque in a couple of weeks. That looks much more of a commercial set-up then I have. Does the kiln have any markings? Doesn't look liked anything on Ward's site. Like I said pay little attention to what I have to say. Here to learn myself
  7. postalpotter

    How much propane will I use

    Linda A. You should take my experience with my own venturi burners and truly pay little attention to it. This was the first time I have ever used the burners or any burners period. I fired two burners like the one below and heated my 15 cubic ft. kiln from 920 to about 2138 in 7hr. My kiln was empty. and I was using one 40gal and one 25gal tank. The tanks began to ice and show about 3/4 of their contents gone before I loss pressure and shut it down. I burned the burners for almost 2 hr. before I learned how to get the temps over 920. My burners are low pressure MR 100's built by Mark Ward. and Mr. Ward said that I should use a 100gal tank to keep from icing up but I opted for 2 40 gal tanks and duel lines to a single regulator. Ward sells his system with 12ft. of hose. My tanks are almost that far from my kiln. There is a wealth of info at www.wardburner.com/technicalinfo/claytimesarticles.html I have to learn how to shrink these photo's
  8. postalpotter

    Gas Kiln Completed

    Yep, she's a flat top. Thanks again Mark for all the help and advice. If you had not caught the fact that I had purchased the wrong HB's then the outcome of my first firing would have been much different and I am not sure if I would have made a second attempt to build this thing. Thank you! Going with the corelite shelves from Sheffield Pottery
  9. postalpotter

    Gas Kiln Completed

    Mark Ward said I would need a 100 gallons and 14 hrs. to get to ^10 if I didn't freeze-up first. We opted for two 40 gal tanks I was using one 40 and one 25 on the test burn. Spent a lot of time trying to get past 920 deg. so I am not worried about gas I am going to play at ^6 for a while before I venture further. I was thinking of weighing the tank before and after to chart my usage of propane. The kiln has a metal skin that I can remove as needed. Have to do a better job with it just not happy with the fit. As for the chimney I came up with a cap. How do you like my chimney cap. Patent pending. Say!!! What about lightning? Should I ground this thing? Neil what say you? I have a stack that is sheeted in metal and braced on the frame of the kiln and it is about 14ft of the ground with my bucket cap sitting on top. The kiln was originally going to be a homemade forced air without bagwalls. Slab size was set and I was going to load from the left side. By the time I figured on Ward's burners and the fact I would need the walls I had moved cinderblocks and bricks more times then I am ashamed to say. So by the time I got busy doing it right I wasn't moving another brick and I decided I didn't want to load the kiln over the left bagwall so I load from the end opposite the burners and always travel to the left and the propane tanks and hoses run on the right.
  10. postalpotter

    Gas Kiln Completed

    Well almost, need to just do a better job of making it weather proof and I need to seal the flue box but I now have a kiln! A special shout out to Mark for his guidance and to Neil for his assistance and advice. To all those who also added their $.02 I also went to extend my sincere thanks and ask that you don’t go anywhere. I am sure I will need your expertise and advice as I continue my trek up Everest. I waited until I was finished with the kiln before I assembled the burners and I was really disappointed Saturday evening when I saw the output of a low pressure propane system. In my mind a yellow flame is unburned gas I got a blue flame of about a ft. and then a yellow flickering flame. Sunday morning I got out there and began to close the door on an empty kiln. With three courses of brick left to place I lit the pilots and then one burner, walked around to the door to take a peek at the flame and promptly singed my eye brows. Turned the burner off, sealed the door and before I knew it the pyrometer read 220deg. Turned both burners on and at 600deg. I started to produce soot. Turned down the burners and watched the temp rise until 920deg. and there it stayed for an hour and a half. That is when I learned what to do with the damper and that is where the fun started. I had the damper full open at that point so I closed it and then opened it a 1/4in. and got smoke. I opened it a ¼ until the smoke went away. Seems that the sweet spot is from ¾ to 1 1/8 with 7/8 open being the spot where I got the best results. It took 7hr. to reach 2138deg. measured with my pyrometer, then I lost pressure in my tanks as I ran out of propane. I had to return to work on Monday so I just opened the kiln today and all is well. I will now buy my kiln shelves and posts. I know I was told to build the kiln around the shelves but I didn’t have a single kiln shelf and just couldn’t see doing it that way. I will do a bisque when they arrive and could use a bit of guidance with the process. Don’t tell anybody but I have never even made a cone pack. Should I just use an 03 04 05 or are their other temps I could watch my kiln reach on my first bisque? Again Thank You All
  11. postalpotter

    Gas Kiln Continued

    Look for my next posting in a few days
  12. postalpotter

    Gas Kiln Continued

    Thanks Rex, Well the kiln is basically finished, I lit the burners this evening and wow what a let down. I was expecting a flamethrower and what I got was a blue flame for about a foot and then just a lazy yellow flame. I know this is a low pressure burner system but? I really have No experience with these things but if there is an interior distance of 27 "for the flame to travel to the far wall plus the 9in. thru the port. The flame exits the port then travels just about 6 in before it turns up. Question? As the heat in my raku kiln builds (weed burner) the flame becomes more intense and the flame exiting the flue grows in length and color will the same thing happen here? As the kiln heats up will the burners become more efficient? It seams that about 3inWC is the most efficient flame with 9in being my max and with that there is only a small change in flame intensity. After all that work building this thing I was expecting something more intense!
  13. postalpotter

    Gas Kiln Continued

    Thank You Rex! Yes, this has been my outlet for a little couch therapy. Not knowing which path to take is a mind killer, slows you down! Don't worry I have eliminated the fiber. I was wondering, every time I look there is more dust from the IFB's on the kiln floor. I am seriously considering coating the inside of the walls with a high temp coating like ITC 100. Yes or No? Today I will put the stack on my kiln. Mark Ward said that I could get away with a chimney that was 8ft. off the floor. With the flue box I will have a chimney of about 10’6”. Mark, Cut the damper, cut it perfect in one pass, thanks for the advise on the circular saw. Cut it maybe a little to perfect. There is only a small amount of play in the slide. Should it be a bit looser to allow for expansion and contraction? Also when I finally put a match to the burners I will do a firing or two empty so I can understand how to work the burners and the air. This will be my first rodeo so I am in no rush to do a load. I understand that time and temperature rise will change when I add mass in the kiln. I was wondering if you could suggest a cone pack sets that I could watch as I bring the kiln to temp. So I could watch the temps rise in the kiln and understand what I am looking for. I have no intention of going past ^5 or ^6 for a long time to come. I have a pyrometer with a single probe but shouldn’t I watch a few cone packs also before I do my first bisque. I am not that worried about the dryness of my first bisque, all my pieces have been sitting on the shelves for months, some for more then a year. That is how bad I need a kiln. Also the thermocouple, should I have a protective sleeve or will just a simple hole in my IFB work fine? Also the addition of an oxygen probe. I found this online, community.ceramicartsdaily.org/topic/5193-how-to-make-an-oxygen-sensor-for-your-kiln/ Should I make this one or does someone have better plans? P.S. also I am using two Ward MR100’s with the ransome pilots and the BASO any ideas on supports either fix or portable that does not mean stacking and balancing them on cinder blocks?
  14. postalpotter

    Gas Kiln Continued

    Thanks Mark. When I first signed on here it was recommended that I read Mel Jacobson's book. That is where I got the idea for the flat top, seemed easier for me to build. Lou has the flue dimensions at 4.5 X 7. Then in " The Art of Firing" Lou explains his double venturi system but gives no dimensions on the flue box but does give the exit flue into the stack at 5 5/8 x 5 5/8. From the pictures I believe the flue box dimensions to be 9x5 x10h then it opens to 9x9 for 2 courses in one pic and 3 courses in another pic on the next page. Before it shrinks to 5 5/8x 5 5/x 2.5h and then it empties into the stack which the materials list in Jacobson’s book uses 9in. diameter risers. That is where I got the dimensions for the 9in damper. Lou has it sliding along 3 bricks on edge. Will work on the roof today weather permitting.
  15. postalpotter

    Gas Kiln Continued

    Oh, I purchased a cordierite shelf.
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