Rex Griggs I have a leak - The Planted Tank Forum
 3Likes
  • 2 Post By Vinster8108
  • 2 Post By ChrisX
  • 2 Post By PlantedRich
 
LinkBack Thread Tools Display Modes
post #1 of 15 (permalink) Old 11-25-2017, 02:27 PM Thread Starter
Planted Tank Enthusiast
 
Aceman's Avatar
 
PTrader: (0/0%)
Join Date: Aug 2014
Location: Ontario Canada
Posts: 735
Rex Griggs I have a leak

So I build a Rex Griggs reactor, itís 22í tall and 2í pipe. Everything is working fine but where the co2 line goes in, it has a tiny leak but only when the co2 is off and Iím scared the line will blow off. How can I fix this ? I drilled the hole a bit smaller then the tube size and jammed the tube in.
Aceman is offline  
Sponsored Links
Advertisement
 
post #2 of 15 (permalink) Old 11-26-2017, 02:17 AM
Planted Tank Guru
 
natemcnutty's Avatar
 
PTrader: (8/100%)
Join Date: May 2016
Location: Portland, OR
Posts: 2,358
Did you jam the tube in from the outside, or did you pull it through from the inside? If from the outside, did you use anything with teeth that might have scratched a slight groove into the vinyl?

Only options I can think of are to silicone / super glue it to create a seal or drain it, pull it out, and try a slightly thicker tubing.

Sent from my Nexus 6 using Tapatalk
natemcnutty is offline  
post #3 of 15 (permalink) Old 11-26-2017, 03:10 AM Thread Starter
Planted Tank Enthusiast
 
Aceman's Avatar
 
PTrader: (0/0%)
Join Date: Aug 2014
Location: Ontario Canada
Posts: 735
Quote:
Originally Posted by natemcnutty View Post
Did you jam the tube in from the outside, or did you pull it through from the inside? If from the outside, did you use anything with teeth that might have scratched a slight groove into the vinyl?

Only options I can think of are to silicone / super glue it to create a seal or drain it, pull it out, and try a slightly thicker tubing.

Sent from my Nexus 6 using Tapatalk


I did it from the outside and jammed it in there, I just did some superclue so I hope that holds lol
Aceman is offline  
 
post #4 of 15 (permalink) Old 11-26-2017, 03:11 AM
Planted Tank Obsessed
 
Vinster8108's Avatar
 
PTrader: (4/100%)
Join Date: Sep 2016
Location: Columbus, OH
Posts: 397
Dang! 22 foot by 2 foot lol, -- seal it with epoxy, rough the edges of the pvc first for a better adhesion.

75g Tank Journal:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Forest's Edge:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Vinster8108 is offline  
post #5 of 15 (permalink) Old 11-26-2017, 03:14 AM Thread Starter
Planted Tank Enthusiast
 
Aceman's Avatar
 
PTrader: (0/0%)
Join Date: Aug 2014
Location: Ontario Canada
Posts: 735
Quote:
Originally Posted by Vinster8108 View Post
Dang! 22 foot by 2 foot lol, -- seal it with epoxy, rough the edges of the pvc first for a better adhesion.


Haha go big or go home right ? The epoxy wonít damage the tube ? And what kind of epoxy
Aceman is offline  
post #6 of 15 (permalink) Old 11-26-2017, 05:24 AM
Planted Tank Obsessed
 
Vinster8108's Avatar
 
PTrader: (4/100%)
Join Date: Sep 2016
Location: Columbus, OH
Posts: 397
Pretty much any two part epoxy will do, just read the applications section on the tube and look for bonds plastics along with any water proof / sealing info. Don't think it will damage the tube in any way, but you will need a dremol tool if you every want to take out the CO2 line haha.

A second option would be to pull out the CO2 line, drill a larger hole, and then fit a threaded barb into it. That's how I've seen a lot of them built. The hole is drill just smaller then the threads of the barb. Before the barb is screwed into the PVC, an epoxy can be applied to the threads, ensuring a seal.
Aceman and Aceman like this.

75g Tank Journal:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Forest's Edge:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Vinster8108 is offline  
post #7 of 15 (permalink) Old 11-28-2017, 11:11 PM
Planted Tank Guru
 
PlantedRich's Avatar
 
PTrader: (2/100%)
Join Date: Jul 2010
Location: United States
Posts: 11,817
I read a lot of posts about getting a large bubble at the top of the reactor and there seems to be a common point in the designs that have this. When using a fitting, the CO2 is not released in the center of the water flow but at the side. Can't prove it as the cause but then it is not following the original plan so mod it at your own risk?
For my use, I would back off, slice the pipe at the point where the current hole is drilled and then pull the tubing in correctly and cover the current hole with the coupling used to put it back together.
The hole has to be small. Too small to force a tube through from the outside but it has to be done the way Grigg's worked out so that the tube does the compression seal. To do this you have to cut the tubing at a really sharp angle to make a point to stick in the hole. Then using pliers, one can gradually pull the tubing in as it is stretched doing this and will be small enough to drag through the hole. A tube small enough to go through without special effort will be too small to seal and will leak or even pull out.
The devil really is in the details.
PlantedRich is offline  
post #8 of 15 (permalink) Old 11-29-2017, 10:30 PM
Wannabe Guru
 
PTrader: (0/0%)
Join Date: May 2017
Posts: 1,703
Quote:
Originally Posted by Aceman View Post
So I build a Rex Griggs reactor, it’s 22’ tall and 2’ pipe. Everything is working fine but where the co2 line goes in, it has a tiny leak but only when the co2 is off and I’m scared the line will blow off. How can I fix this ? I drilled the hole a bit smaller then the tube size and jammed the tube in.
Drilling a hole directly into the tube and then keeping fingers crossed it won't leak is such a bad idea!

What you should do is cut out the section with the leaking hole, put a "t" joint in (2" -> 3/4") then find a 3/4" to 1/3" adapter to install the Co2 tubing.

Bump:
Quote:
Originally Posted by Vinster8108 View Post
Pretty much any two part epoxy will do, just read the applications section on the tube and look for bonds plastics along with any water proof / sealing info. Don't think it will damage the tube in any way, but you will need a dremol tool if you every want to take out the CO2 line haha.

A second option would be to pull out the CO2 line, drill a larger hole, and then fit a threaded barb into it. That's how I've seen a lot of them built. The hole is drill just smaller then the threads of the barb. Before the barb is screwed into the PVC, an epoxy can be applied to the threads, ensuring a seal.
I tried this method, it is also prone to leak. Think about it, you have a curved, 1/8" wall of PVC, and a threaded brass screw in nipple barb. This leaked, even with gasket sealant. Unless you have an actual tap kit and can tap a threaded hole, this is such a bad idea, prone to failure.

Aceman and Aceman like this.

Last edited by ChrisX; 11-29-2017 at 10:34 PM. Reason: more
ChrisX is online now  
post #9 of 15 (permalink) Old 12-04-2017, 11:11 PM
Algae Grower
 
PTrader: (0/0%)
Join Date: Oct 2011
Location: georgia
Posts: 104
I used a barb on mine with silicone to seal around it and have had no issues.
rebus20 is offline  
post #10 of 15 (permalink) Old 12-04-2017, 11:52 PM
Planted Tank Guru
 
PlantedRich's Avatar
 
PTrader: (2/100%)
Join Date: Jul 2010
Location: United States
Posts: 11,817
Quote:
Drilling a hole directly into the tube and then keeping fingers crossed it won't leak is such a bad idea!

This is what I often find fault with when new folks build their reactors. We have an old guy who worked for years to develop a way to build a reactor that worked really well. He was so successful at doing it that his method is now almost the "gold standard" for reactors. We even use his name even when we decide to stray from his design!
So the point that comes around is what makes us feel we know so much more about building a reactor for the first time? Do we have a reactor that is so successful that it is used by hundreds/thousands of people and named after us? Lots of people do try to build a better wheel or mousetrap but I think I will stick to doing it the way that Grigg's did it and made it work! But then we do have to read and understand the basic ideas as Grigg's designed them. Things like compressing the tubing to seal it are such a basic part of the plan that we should only move away from the plan when we have proved our method works better. At that point we can all start using the new plan and it will be named something different!
Kubla and Kubla like this.
PlantedRich is offline  
post #11 of 15 (permalink) Old 12-05-2017, 02:48 AM
Planted Tank Guru
 
natemcnutty's Avatar
 
PTrader: (8/100%)
Join Date: May 2016
Location: Portland, OR
Posts: 2,358
Quote:
Originally Posted by PlantedRich View Post
Quote:
Drilling a hole directly into the tube and then keeping fingers crossed it won't leak is such a bad idea!

This is what I often find fault with when new folks build their reactors. We have an old guy who worked for years to develop a way to build a reactor that worked really well. He was so successful at doing it that his method is now almost the "gold standard" for reactors. We even use his name even when we decide to stray from his design!
So the point that comes around is what makes us feel we know so much more about building a reactor for the first time? Do we have a reactor that is so successful that it is used by hundreds/thousands of people and named after us? Lots of people do try to build a better wheel or mousetrap but I think I will stick to doing it the way that Grigg's did it and made it work! But then we do have to read and understand the basic ideas as Grigg's designed them. Things like compressing the tubing to seal it are such a basic part of the plan that we should only move away from the plan when we have proved our method works better. At that point we can all start using the new plan and it will be named something different!
The problem is that his design is more of a concept than a blueprint - definitely not a one size fits all. Flow rate of your canister or pump really determines diameter and length of pipe, and to address this, people have made modifications to make it more of a one size fits all by adding bypass to make flow adjustable, adding back pressure, adding a venturi loop, etc.

I understand not wanting to call them by his moniker, but it's still based on the concepts of his design. As an example, it took me 3 attempts to find that 1-1/4 pipe at 24" long was the sweet spot for my Eheim 2215. Using 2" pipe like the original design resulted in all of the CO2 sitting at the top even at 28" long which was the max I could fit in my stand.

It would be great if he, or someone, had a formula to determine proper diameter and length based on flow rate. If anyone knows of a source like this, let me know

Sent from my Nexus 6 using Tapatalk
natemcnutty is offline  
post #12 of 15 (permalink) Old 12-05-2017, 04:56 PM
Planted Tank Guru
 
PlantedRich's Avatar
 
PTrader: (2/100%)
Join Date: Jul 2010
Location: United States
Posts: 11,817
Quote:
Originally Posted by natemcnutty View Post
The problem is that his design is more of a concept than a blueprint - definitely not a one size fits all. Flow rate of your canister or pump really determines diameter and length of pipe, and to address this, people have made modifications to make it more of a one size fits all by adding bypass to make flow adjustable, adding back pressure, adding a venturi loop, etc.

I understand not wanting to call them by his moniker, but it's still based on the concepts of his design. As an example, it took me 3 attempts to find that 1-1/4 pipe at 24" long was the sweet spot for my Eheim 2215. Using 2" pipe like the original design resulted in all of the CO2 sitting at the top even at 28" long which was the max I could fit in my stand.

It would be great if he, or someone, had a formula to determine proper diameter and length based on flow rate. If anyone knows of a source like this, let me know

Sent from my Nexus 6 using Tapatalk
What I see happening is that there are often really small items changed which we feel are meaningless but then when we have a problem we miss looking at those small points we changed. I have no data to use as I have not done that mod but I suspect changing where the CO2 is injected is really more important than many think.
Since the normal first thought would be to just use a fitting, I think there is a reason for Grigg's to have gone to the extra trouble to develop a different way to get the CO2 injected to the right spot.
Quick question to verify what I suspect? When using the 2" pipe did you pull the tubing through an undersized hole or use a fitting?
PlantedRich is offline  
post #13 of 15 (permalink) Old 12-05-2017, 07:15 PM
Algae Grower
 
PTrader: (0/0%)
Join Date: Aug 2017
Posts: 49


Instead of drilling an undersized hole and pulling the tubing through... I went with a thread tap & barb fitting. Seems to be a safer bet IMO. I actually had a tiny leak after but sealed the fitting (yes there was thread sealant between the two interfaces) with some hot glue and it has been good since.
changaroo is offline  
post #14 of 15 (permalink) Old 12-05-2017, 07:33 PM
Planted Tank Guru
 
natemcnutty's Avatar
 
PTrader: (8/100%)
Join Date: May 2016
Location: Portland, OR
Posts: 2,358
Quote:
Originally Posted by PlantedRich View Post
What I see happening is that there are often really small items changed which we feel are meaningless but then when we have a problem we miss looking at those small points we changed. I have no data to use as I have not done that mod but I suspect changing where the CO2 is injected is really more important than many think.
Since the normal first thought would be to just use a fitting, I think there is a reason for Grigg's to have gone to the extra trouble to develop a different way to get the CO2 injected to the right spot.
Quick question to verify what I suspect? When using the 2" pipe did you pull the tubing through an undersized hole or use a fitting?
I never use a fitting, and I've never had a leak from pulling airline tubing through an 11/64" drilled hole. I agree that it is most efficient when pulled to the middle, but the flow in the 2" pipe was simply not enough to counteract the buoyancy of the bubbles.

I had thought about using a bike needle attached to the tubing on the inside, but I figured it would just blow them out at that point. Like I said, it can be quite a pain to dial in for your flow rate

Sent from my Nexus 6 using Tapatalk
natemcnutty is offline  
post #15 of 15 (permalink) Old 12-05-2017, 08:49 PM
Planted Tank Guru
 
PlantedRich's Avatar
 
PTrader: (2/100%)
Join Date: Jul 2010
Location: United States
Posts: 11,817
I'm probably fighting a lost cause at best in looking for a common cause that we could put a finger on when a bubble is formed at the top. Looking back and thinking of some of the comments, questions, and suggestions that the design brought out when first becoming well known, I see it has not changed very much. The only change seems to be that it is far more accepted but has far more mods that have popped up along the way.
Seems to be the public is somewhat perverse in wanting to use it but also wanting to change it. Human nature, maybe? I think I will not try too hard to change that on the small points!
PlantedRich is offline  
Reply

Tags
None

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the The Planted Tank Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome