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Old 09-02-2018, 12:17 PM
Jesse Bogenrief Jesse Bogenrief is offline
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Glass in the tank

Looking for advise on how to handle the glass i have in my furnace. I went out of town and my furnace shut off while i was gone. It got down to 400 or so degrees and was off for about 30 hrs. i slowly brought it back up and want advice on the glass. Is it useable? Is there certain precautions i should take or issues to watch out for? i understand it will have ropes and other nasty things but can i run pumpkins and ornaments out of it? Is it fine? should i anneal it different? Thank you
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Old 09-02-2018, 03:23 PM
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If it's a tank, it depends on what the tank is made of. AZS can be seriously damaged doing this stuff but your glass would just have a lot of stones. If it's a pot, you need to be concerned with cracking the pot bringing it back up too fast ( or just bringing it back up at all). Not so many stones but maybe a broken pot. Bring it up slow.

Excellent choice of glass for pumpkins in my opinion.
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Old 09-02-2018, 10:15 PM
Chris Lowry Chris Lowry is offline
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Iíve wondered about this... with a pot is it more likely to crack on the way down or up, if itís full of glass
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Old 09-03-2018, 07:07 AM
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Up. Always up. The pot is never completely full so the refractory heats up unevenly in the worst possible way. You need to bring it up really slowly as in 20-25 F per hour. The bigger the pot, the slower you go. It still may not work.
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Old 09-05-2018, 10:57 AM
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Crashed to room temp over a about 4 days that furnace holds heat well.


Anyway, just set it to 20f and hour going up to 1700f and walked away. Came back once it leveled out at 1700f for a 1/2 day and ran it up full tilt boogie. The 1/2 day at 1700f was not planned just life keeping me from getting to it.

After this month we will be pulling this guy off line and doing a rebuild to switch into SP batch. It is just time not because we are switching glass more just happens to be the right time for a new pot. Should be interesting to get a look at the inside after a solid 1 and 1/2 on C-cullet as one of the first ones to drop the dime on melting it back when Pete first got it in town. I like the glass but based on the amount of damage to the Moly slots at the top I am more than interested to do a full assessment of the furnace after pulling the crown off.

Last edited by Scott Novota; 09-05-2018 at 11:00 AM.
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Old 09-05-2018, 12:00 PM
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Quote:
Originally Posted by Scott Novota View Post
Crashed to room temp over a about 4 days that furnace holds heat well.


Anyway, just set it to 20f and hour going up to 1700f and walked away. Came back once it leveled out at 1700f for a 1/2 day and ran it up full tilt boogie. The 1/2 day at 1700f was not planned just life keeping me from getting to it.

After this month we will be pulling this guy off line and doing a rebuild to switch into SP batch. It is just time not because we are switching glass more just happens to be the right time for a new pot. Should be interesting to get a look at the inside after a solid 1 and 1/2 on C-cullet as one of the first ones to drop the dime on melting it back when Pete first got it in town. I like the glass but based on the amount of damage to the Moly slots at the top I am more than interested to do a full assessment of the furnace after pulling the crown off.
Y'all lost power from Gordon?
Please keep us updated on the furnace.
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Old 09-05-2018, 10:05 PM
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Nah Gordy was a big gutter washer and that was about it.


I got the Moly Elements in and installed and she is humming along just fine. Going to finish out this C-Cullet I have around the end of Sept...maybe Oct and take her down and rebuild/repair.

I now have a spare Moly element on the self double boxed and had a local shaman come by and put a sage burning blessing on it for safe keeping.

Need to talk with Pete about getting a spare set of straps and clamps and I should be good. After the rebuild I will have to order up a shelf pot but such is life with having a spare for everything. Keeps me rolling. Heck that little wire furnace I kept for backup sure saved my bacon. It however is like driving a 1980s CJ Jeep with no top after driving around in a Tesla for a couple years. It gets you there but man you really know you took a trip.

Have about 1200lbs of C-cullet to burn though then on the SP band wagon. Have the batch already in the shop all stacked up and ready to burn. The other public shop here in town went over to GLASMA. That should prove to be interesting...I might even have to drop by and give it a spin as I have not blown that since coming back from Norway.

Last edited by Scott Novota; 09-05-2018 at 10:13 PM.
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Old 09-06-2018, 06:55 AM
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I have the straps here. There's no good reason to need new clamps unless you physically broke them.
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Old 09-06-2018, 08:01 AM
David Russell David Russell is online now
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Scott, Where did you get you elements from? I assume it was not Pete since I read he doesn't ship them anymore due to breakage rate.
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Old 09-06-2018, 08:30 AM
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I ship elements regularly. At this point we drop ship directly from the factory using DHL. It is faster and the breakage rate has fallen significantly. The less times elements get shipped, the better. It takes about two weeks to process and deliver an order.
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Old 09-06-2018, 09:15 AM
David Russell David Russell is online now
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Thank you Pete, good to know. I just used my last two spares. Will be in the market soon.
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Old 09-15-2018, 01:19 PM
Paul Thompson Paul Thompson is offline
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Red face

Quote:
Originally Posted by Scott Novota View Post
...

After this month we will be pulling this guy off line and doing a rebuild to switch into SP batch...
Pardon my ignorance; I thought there was something about melting batch that required combustion. I. E. Not an electric furnace.
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Old 09-15-2018, 01:37 PM
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Quote:
Originally Posted by Paul Thompson View Post
Pardon my ignorance; I thought there was something about melting batch that required combustion. I. E. Not an electric furnace.
Not necessary, but preferable in some cases. The discussion here involves a moly furnace (I believe), so batch works well. A little wire melter is a different story. You can do it if you're not in a hurry.
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Old 09-15-2018, 02:46 PM
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You can melt batch in a wire unit. I think it best if you use snowflake, or mix your own as a real powder.

The great advantage to a decent gas furnace for this stuff is that you have more horsepower generally. Usually, the burner can be cranked up. You can crank up a moly as well if the watts per sq ft allow it but it is indeed harder in a wire unit.
Conventionally, Kanthal elements operate at their best under 2200F. You can indeed melt batch at that temperature in a wire unit but size of charge, time between charges and overall fining time start to get in the way. Many wire people are weekend warriors and don't have the luxury of taking their time.

It can be overcome by turning the unit up. The boro people do this constantly, running well into the 2300F range but they pay in element replacement. They can also pay in pot replacement if the unit fails and crashes when full whether it's boro or Soda Lime. Element life can be extended if you install an SCR in the wiring. Soft starts are always better.

If you do choose to melt batch in a wire unit, plan on running at 2250 for longer periods. Plan on having extra elements. Plan on keeping a spare pot.

I'm really continually surprised at how few people keep a spare pot. Right now we're backed up about a month on anything bigger than a 19 inch unit. Demand has been very high, much more than usual.
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