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Eclipse Fusible Plug Location


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Old 06-22-2019, 08:38:28 PM
Jim Mackessy Jim Mackessy is offline
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Default Eclipse Fusible Plug Location

We are re-tubing a vertical Eclipse Boiler, and there is a fusible plug in the firetube just behind the upper hand hole. It appears that the tube was pierced and formed before threading to produce enough metal length to tap and get a seal around the fusible plug. Is anyone familiar with how this was done, hot or cold worked, and if there is a special set of tools? - JM
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Old 06-23-2019, 12:20:29 AM
Richard Miller Richard Miller is offline
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Default Re: Eclipse fusible plug location

We had a local boiler repair shop replace 107 2" 13 ga tubes and the one with the fusible plug they used an 11ga tube and bored the inside out to the 13 ga thickness about 6" into both ends. The tube was then drilled and tapped for the fusible plug and a pipe nipple was then installed ofter the tube was in place to keep it lined up with the hand hole opening while rolling. Hope this was helpful.
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Old 06-23-2019, 12:48:09 AM
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Reeves13hp Reeves13hp is offline
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Default Re: Eclipse fusible plug location

Heat the tube red drive a tapered punch into the tube. The ones we have done were 3/8ths pipe. Have a tapered punch the correct diameter to match drill size. Then let cool and tap hole. Then install tube in boiler with threaded spot facing hand hole opening. Install water side fuse plug. Steller Ind sells them. David
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Old 06-23-2019, 07:01:40 AM
Jim Mackessy Jim Mackessy is offline
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Default Re: Eclipse fusible plug location

Thanks, that's what I was wondering. I have gotten the plugs from Steller in the past. I can make the punch to match a taper reamer for that size. Onward! - JM
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Old 06-23-2019, 07:50:17 PM
Dale Miner Dale Miner is offline
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Default Re: Eclipse fusible plug location

I would practice on shorts before making my first try on a full length tube.


I think you will need to have a hole in the tube about 1/4" smaller than the tap drill size, and very likely will need to have a backup piece inside the tube with a hole about 1/4" larger then the expected tap drill diameter plus two tube wall thicknesses. The backup piece will need to be made in two pieces to be able to be removed after forming the tube.

Why not just weld a thicker donut section in the tube wall at the needed location?
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Old 06-23-2019, 10:05:20 PM
Ryan Williams Ryan Williams is offline
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Default Re: Eclipse fusible plug location

Quote:
Originally Posted by Dale Miner View Post
Why not just weld a thicker donut section in the tube wall at the needed location?
Unfortunately, that's where most states require an R-stamp certified welder. Good because the welder will know how to do his job safely and properly. Bad because it often costs big $$ to hire such a welder. Theoretically, it wouldn't be hard to do and the weld should have very little effect but that doesn't change the requirements for running a boiler in public.

A 10gauge tube with a hole put in it using heat and a punch should have plenty of meat for the plug to thread into it.
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