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Old 09-06-2019, 04:31 PM
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Moly element failure

We are going through a crucible change for our 400# Stadelman furnace and finished and turned on the furnace and it started to spark from this element. It is a new element with a new strap. At first it broke off right at the line between the light gray and dark gray of the element. After taking off the top piece that broke away, we tried to attach the straps to just the remaining dark gray length. Turned it on and continued to get more sparks. Unfortunately, this was the 3rd element that we replaced today, and our last spare.
We have another older one that we replaced because it broke off on the same line that we will try and put back in service...
Any ideas why this may be happening???
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Old 09-06-2019, 06:32 PM
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It sounds like it was cracked in more than one place.
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Old 09-06-2019, 07:29 PM
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Quote:
Originally Posted by Pete VanderLaan View Post
It sounds like it was cracked in more than one place.
I guess... it tested out, but when we turned on the juice, kaPOW!!!!
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Old 09-06-2019, 09:19 PM
Brian Wong Shui Brian Wong Shui is offline
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Maybe some twisting going on while the straps were being tightened or maybe over tightening the strap (ie crushing the shank and causing cracks).
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Old 09-07-2019, 09:17 AM
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When I've seen this happen, it invariably comes from an overtightening of the strap. In testing , the crushed material still conducts and shows continuity but once power is applied it expands rapidly and shows the failure. I have so far not seen one do it in two places but it's the likely explanation.
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Old 09-08-2019, 11:19 PM
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Ah man this is really a hard blow. I sympathize.

I have two spare elements at the shop but I am almost positive they are the size smaller than you use. If however, they are the same size I am happy to help. They are the smaller of the two that Steve pushed out the door and where on Ardin's furnace. Give me a call if you think might need one.
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Old 09-09-2019, 07:32 AM
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you can install the 9/18 312/500 as a replacement but you have to put one in each bank to balance it. It will lose wattage but will work.
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Old 09-09-2019, 11:14 AM
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Quote:
Originally Posted by Scott Novota View Post
Ah man this is really a hard blow. I sympathize.

I have two spare elements at the shop but I am almost positive they are the size smaller than you use. If however, they are the same size I am happy to help. They are the smaller of the two that Steve pushed out the door and where on Ardin's furnace. Give me a call if you think might need one.
I appreciate it Scott! I think that those are smaller because Arden's (yours) is a smaller furnace.... We are going to Orange Beach this weekend. Are you going to be around?
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Old 09-09-2019, 11:16 AM
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Quote:
Originally Posted by Pete VanderLaan View Post
you can install the 9/18 312/500 as a replacement but you have to put one in each bank to balance it. It will lose wattage but will work.
I am getting Cheyenne's last two elements. Those will be spares. He is ordering more because there is now a "need", so I will stock up again until I have enough for a full change. You have to have back-ups for consumables... a friend always tells me that
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Old 09-09-2019, 03:54 PM
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The 300# takes a 9/18 312/500
The 28 inch ( about 430#) takes the 9/18 450/500 ( or..550)

Without looking in the big book of numbers, the smaller set uses about 1500 less watts. You can always include a balanced pair of elements in a pinch but they have to be balanced to the banks.
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Old 09-09-2019, 10:04 PM
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Oh yes...I will be around for sure. Let me know what your plans are and when you will be free and we can line something up. We can figure out what works. Here, there, whatever.

If you don't still have my number let me know.

Last edited by Scott Novota; 09-09-2019 at 10:06 PM.
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Old 09-10-2019, 08:38 AM
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Quote:
Originally Posted by Mark Rosenbaum View Post
I am getting Cheyenne's last two elements. Those will be spares. He is ordering more because there is now a "need", so I will stock up again until I have enough for a full change. You have to have back-ups for consumables... a friend always tells me that
****
When I was doing elements a cardinal rule around here was to never ship them twice. Tweaking the nose of Buddah comes up. I'm surprised that he's doing it that way but it's good for you.
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Old 09-10-2019, 11:40 AM
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Quote:
Originally Posted by Scott Novota View Post
Oh yes...I will be around for sure. Let me know what your plans are and when you will be free and we can line something up. We can figure out what works. Here, there, whatever.

If you don't still have my number let me know.
I don't have your #... do you have mine? Text me yours if you do.
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