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Is "suck back" a problem when using a thumper?

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Is "suck back" a problem when using a thumper?

Postby Buddy » Mon Jan 23, 2017 11:34 am

So the udder day I ordered a thumper to add to my rig. Then thinkin' about how this works I wondered if when you get done with a run and shut it down, and the vapors in the main boiler start to condense if this creates a "suck back" from the liquid in the thumper to the main boiler? Has anyone running a thumper run into this, or am I just inventin' stuff to worry about?
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Re: Is "suck back" a problem when using a thumper?

Postby Azframer » Mon Jan 23, 2017 12:08 pm

Yes you will have suck back during the cooling off. Not sure it will pull it completely out of your thumper or not, depends a lot on piping size, angles and all that biz whether it will suck your thumper to the bottom of your inlet pipe.
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Re: Is "suck back" a problem when using a thumper?

Postby Tracker » Mon Jan 23, 2017 5:51 pm

Just disconnect fittings at the end of a run.


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Re: Is "suck back" a problem when using a thumper?

Postby S-Cackalacky » Tue Jan 24, 2017 7:58 am

If I remember, I usually open up the fill port on the boiler at the end of a run to equalize the pressure. If I don't remember to do it, I only have one vessel to empty.
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Re: Is "suck back" a problem when using a thumper?

Postby Kareltje » Tue Jan 24, 2017 7:04 pm

But what is the problem? Even if the boiler would suck all the contents out the thumper: so what?
Unless you want to reuse the backset again, you will throw it away anyhow.
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Re: Is "suck back" a problem when using a thumper?

Postby S-Cackalacky » Wed Jan 25, 2017 8:52 am

Only problem I could see is if you had the thumper loaded with something that could plug the input line back to the boiler - fruit, grain, or some such. If that line were to truly get plugged, you might see the boiler collapse. Otherwise, you're probably doing yourself a small favor by allowing it to get sucked back into a single container. Just need to exercise a little common sense.
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Re: Is "suck back" a problem when using a thumper?

Postby John Galt » Sun Jan 29, 2017 2:11 am

S-Cackalacky wrote:Only problem I could see is if you had the thumper loaded with something that could plug the input line back to the boiler - fruit, grain, or some such. If that line were to truly get plugged, you might see the boiler collapse. Otherwise, you're probably doing yourself a small favor by allowing it to get sucked back into a single container. Just need to exercise a little common sense.


Not sure I would get too worried about a boiler collapse unless I was changing temperature during that period of vacuum. In otherwords,do not feed cold water in to rinse your boiler right afterward, unless you have a vent.
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Re: Is "suck back" a problem when using a thumper?

Postby Tracker » Sun Jan 29, 2017 7:37 am

The understood that the question was pertaining to suck back of the thumper contents, not a collapse of the boiler.
But then I could be wrong once again.


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Re: Is "suck back" a problem when using a thumper?

Postby S-Cackalacky » Sun Jan 29, 2017 8:09 am

I won't argue the dynamics and possibility of a metal tank collapsing under the conditions we've discussed here - I've seen it happen with my own eyes under similar circumstances. If I were especially running a flimsy stock pot still, I would be very careful when running solids in the thumper.

Yes, the OP asked about suck back from the thumper, but it's the same dynamic that causes suck back that can also cause the boiler to collapse. Just presenting a potential possibility and reason to be cautious. I don't think anyone here want to see their boiler collapse.
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Re: Is "suck back" a problem when using a thumper?

Postby Hilltop » Tue Mar 13, 2018 7:32 pm

Kareltje wrote:But what is the problem? Even if the boiler would suck all the contents out the thumper: so what?
Unless you want to reuse the backset again, you will throw it away anyhow.


On a thin all copper pot it could be a big problem. On a keg or barrel little worry. I have a union between my boiler and thumper and loosen it when done.
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Re: Is "suck back" a problem when using a thumper?

Postby Pikey » Mon Jun 18, 2018 3:21 pm

Thank you for raising this question Buddy - I could have walked straight into that issue.

Perhaps a "T" in the Lyne arm and a little "L" shaped copper in say 1/2 " with a valve on the end ?

Closed when you run and open it when you switch off ?

Like SCackallacky's "Open the fill port" - for people without fill ports ?
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Re: Is "suck back" a problem when using a thumper?

Postby JBC » Wed Jun 20, 2018 9:57 am

Q:
Pikey wrote:
Like SCackallacky's "Open the fill port" - for people without fill ports ?

A:
Tracker wrote:Just disconnect fittings at the end of a run.


Cheers.


Pikey: The first time I used my thumper I had a great first strip run. I strip with liquids in the boiler and the muck in the thumper. I finished, proud that my new thump worked so well. I turned off the flame and started to cleanup. About 15 minutes later I broke the connections on the piping and gooey hot muck oozed out of the 2in pipe. At least half of the muck sucked back into the boiler. Lesson learned. Now I just carefully loosen one of the tri clamps to the thump and break the seal.
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Re: Is "suck back" a problem when using a thumper?

Postby Pa_bon » Wed Jun 20, 2018 10:04 am

Simple as that!
Overhead the albatross
Hangs motionless upon the air
And deep beneath the rolling waves
In labyrinths of coral caves
An echo of a distant time
Comes willowing across the sand
And everything is green and submarine

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