Should I cut it?

Vapor, Liquid or Cooling Management. Flutes, plates, etc.

Moderator: Site Moderator

Post Reply
AshtonG
Novice
Posts: 4
Joined: Fri Feb 19, 2021 11:07 pm
Location: Auckland, NZ

Should I cut it?

Post by AshtonG » Sat Apr 03, 2021 1:47 am

My Chinese pot still has a narrower section inside the column after the tri clamp.

Any ideas if this could have been on purpose?
Or should I drill it out to better the still?

Interested in your wisdom
IMG_20210403_220731_compress88.jpg
IMG_20210403_220723_compress82.jpg

User avatar
Demy
Distiller
Posts: 1244
Joined: Fri Sep 04, 2020 1:45 pm

Re: Should I cut it?

Post by Demy » Sat Apr 03, 2021 2:20 am

I don't know why they built that narrow part, but if it's a pot-still you could leave it, I don't see improvement in removal. Perhaps they built that choken to somehow change the steam flow ....

User avatar
Yummyrum
Global moderator
Posts: 3951
Joined: Sat Jul 06, 2013 2:23 am
Location: Mid North Coast Aussie

Re: Should I cut it?

Post by Yummyrum » Sat Apr 03, 2021 3:38 am

AshtonG wrote:
Sat Apr 03, 2021 1:47 am
Or should I drill it out to better the still?
Ashton , if you got the drills and skills to widen that hole I’m wondering why you would stoop so low as to buy such a piece in the first place :crazy: I’m sure you could build yourself a heaps better still :thumbup:

Anyhow , I have know idea what the logic is behind such a design . Seems these Chinese still makes just make random variations on a theme with no actual understanding of what they are doing .

Maybe they had a whole bunch of SS tubes with ends with a hole that size in it and one if them said “ lets weld a ferrule on it and flog it off as some distilling equipment” ..who bloody knows .

If I tried to quantify it with a huge amount of imagination , I might consider an onion on a pot still head . Like Demy suggested , small hole , higher vapour speed , then collapses inside the bigger space . .... but seriously , that pipes not really that wide ....

User avatar
still_stirrin
Master Distiller
Posts: 8500
Joined: Tue Mar 18, 2014 7:01 am
Location: where the buffalo roam, and the deer & antelope play

Re: Should I cut it?

Post by still_stirrin » Sat Apr 03, 2021 5:53 am

It looks like a “muffler”, like used in an automobile exhaust system. It may be an attempt to use the expansion chamber to slow the vapor flow and induce some condensation. Onion top designs do that and maybe your riser pipe is a “shot in the dark” at that type of mechanism with simple piping instead of a creatively turned top hat.
ss
Attention new distillers: Cranky's spoon feed info
My LM/VM & Potstill: My build thread
My Cadco hotplate modification thread: Hotplate Build
My stock pot gin still: stock pot potstill
My 5-grain Bourbon recipe: Special K

Andrew_90
Swill Maker
Posts: 255
Joined: Sun Aug 30, 2020 9:24 am
Location: Johannesburg, South Africa

Re: Should I cut it?

Post by Andrew_90 » Sat Apr 03, 2021 7:52 am

There was a thread, a very useful collection of drawings. https://homedistiller.org/forum/viewtop ... =1&t=18873

One of the drawings posted VM Column - 50 mm (2") had two "Reflux Collars" which were effectively restrictions pretty much like you have. In the notes it was also called a "Reflex Collar and Turbulence Generator". In a 1200 - 1500mm column one was placed 1/3 way from the bottom, the other directly beneath the T Piece. In a 2" column the "reflux collar" has an aperture of 25mm (1").

Have no idea if it actually functions!

I read elsewhere that a reflux collar can avoid puking.
One too many wasted sunsets, one too many for the road.

User avatar
Saltbush Bill
Site Mod
Posts: 5185
Joined: Thu Mar 17, 2011 2:13 am
Location: Northern NSW Australia

Re: Should I cut it?

Post by Saltbush Bill » Sat Apr 03, 2021 1:13 pm

Yummyrum wrote:
Sat Apr 03, 2021 3:38 am
I have know idea what the logic is behind such a design . Seems these Chinese still makes just make random variations on a theme with no actual understanding of what they are doing
I think your right Yummy........half of them just build stuff that looks like it might work.....with no real idea of if it will work. They really dont care as long as people buy it.

AshtonG
Novice
Posts: 4
Joined: Fri Feb 19, 2021 11:07 pm
Location: Auckland, NZ

Re: Should I cut it?

Post by AshtonG » Wed Apr 07, 2021 11:39 pm

Thanks all!
Yummyrum wrote:
Sat Apr 03, 2021 3:38 am
AshtonG wrote:
Sat Apr 03, 2021 1:47 am
Or should I drill it out to better the still?
Ashton , if you got the drills and skills to widen that hole I’m wondering why you would stoop so low as to buy such a piece in the first place :crazy: I’m sure you could build yourself a heaps better still :thumbup:
Skills to drill, but not quite to go whole hog just yet. Just wanted something with tri clamps that can grow with me.
Andrew_90 wrote:
Sat Apr 03, 2021 7:52 am
There was a thread, a very useful collection of drawings. https://homedistiller.org/forum/viewtop ... =1&t=18873
Excellent link! have saved for future reference

From your comments it seems the onion-eske approach, will leave as is, if the choke is not going to cause an issue.

Image from a sac run for further clarity, if this helps someone else in the future
DSC03304.JPG

User avatar
Windy City
Site Donor
Site Donor
Posts: 781
Joined: Fri Jan 25, 2013 10:52 pm
Location: Chicagoland

Re: Should I cut it?

Post by Windy City » Thu Apr 08, 2021 4:28 am

Hey AshtonG
You would have been better off starting with this picture instead of the previous.
This still has bigger problems than that minor restriction at the riser.

You need to get rid of all those plastic/rubber tubes that can come in contact with alcohol ( from the riser to the condenser and the outlet of the condenser) also make sure you are using teflon/PTFE for your tri-clamp connection.
This forum greatly frowns upon the use of any synthetic material with the exclusion of teflon/PTFE.

Also what is the size of that copper tube from the riser to the condenser? If I was going to open anything on that still I would start by having a couple of tri-clamps on the top and getting rid of that small tube connecting the two.

Make your repairs before you do your sac run or you will just have do it again.
The liver is evil and must be punished

User avatar
still_stirrin
Master Distiller
Posts: 8500
Joined: Tue Mar 18, 2014 7:01 am
Location: where the buffalo roam, and the deer & antelope play

Re: Should I cut it?

Post by still_stirrin » Thu Apr 08, 2021 4:38 am

Also, a bigger water reservoir would help. With that small bucket, you’ll have to exchange the water several times during a run because the water will get hot rather quickly.
ss
Attention new distillers: Cranky's spoon feed info
My LM/VM & Potstill: My build thread
My Cadco hotplate modification thread: Hotplate Build
My stock pot gin still: stock pot potstill
My 5-grain Bourbon recipe: Special K

AshtonG
Novice
Posts: 4
Joined: Fri Feb 19, 2021 11:07 pm
Location: Auckland, NZ

Re: Should I cut it?

Post by AshtonG » Fri Apr 09, 2021 5:02 pm

Windy City wrote:
Thu Apr 08, 2021 4:28 am
You need to get rid of all those plastic/rubber tubes
I've done my due diligence :thumbup: (lots of posts on HD that have helped), and in this case these plastics hoses okay.
For more detail (if anyone else has the same dibosh still), the copper pipe is 1 continuous piece from the riser through to the outlet, so the plasics on either side of the condensor are just to keep the cooling water inside. At the top of the riser there was a loose fit from the SS to the copper, so i've used PTFE tape to build up to a tight fit that then strengthened with the existing plastic tubing (prevent it being pulled out).

Have also replaced the tri clamp gasket with PTFE, and done what I can to the larger pot lid seal.
still_stirrin wrote:
Thu Apr 08, 2021 4:38 am
Also, a bigger water reservoir would help.
Definitely, the bucket was fine for a vinegar run, but when I did my first full run even the 70L rubbish bin i used started to get warmer than warm, managed to finish the run by frozen cooler bags and replacing ~30L (into the hydroponics) to drop the temp. Looking for a better solution for my next full run.
Windy City wrote:
Thu Apr 08, 2021 4:28 am
Also what is the size of that copper tube from the riser to the condenser? If I was going to open anything on that still I would start by having a couple of tri-clamps on the top and getting rid of that small tube connecting the two.
Lot of potential changes in my head, just wanted an expandable base to start with without a large investment (labour time or cost).

Post Reply