Things they never tell you about CO2 equipment! - Page 3 - Equipment - Aquatic Plant Central

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Old 01-09-2010, 06:16 PM   #21 (permalink)
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Default Re: Things they never tell you about CO2 equipment!

I came across this thread while googling for teflon CO2 recessed seals/washers:
https://www.aquaticplantcentral.com/f...on-washer.html
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Old 01-09-2010, 06:24 PM   #22 (permalink)
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Default Re: Things they never tell you about CO2 equipment!

Here is a link to the snap-in teflon washers for the MA957 newer style:
http://www.reliablepaper.com/Regulat...312-CO-1TW.htm
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Old 01-09-2010, 06:28 PM   #23 (permalink)
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Default Re: Things they never tell you about CO2 equipment!

in the less general case of pressurized tanks and regulator connections - it seems the only place I see evidence of taping cylinder threads being advised - is in Milwaukee instructions and people who quote them. Or is that wrong? Welding shops and welders around here say its wrong to tape cylinder connections to the regulator. Is it a central Indiana thing or is that typical for regulator-tank connections everywhere? Do your welding shops say tape reg connection or not to?

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I looked into the thread situation for the CO2 bottles and regulators before I spoke even thou I thought I knew the answer from doing piping for years, many years ago. They are what is called NPT = National Pipe Thread. Same as on piping. They do have a taper. Hydraulic lines tend to use ferrels to seal the connection. Pipe dope is used all the time on water, steam and gas.
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Old 01-09-2010, 06:34 PM   #24 (permalink)
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Default Re: Things they never tell you about CO2 equipment!

ashappard,
The only place I've ever seen teflon tape used on regulators is on the gauges and other connections. I've been in manufacturing engineering for over 25 years and seen lots of equipment. Teflon tape and various types of teflon paste and pipe dopes are used all the time on water, steam and gas piping. You do need to becareful not to overtighten.

As soon as I need to remove my MA957 to refill the bottle I will be removing the teflon tape.
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Old 01-09-2010, 06:37 PM   #25 (permalink)
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Default Re: Things they never tell you about CO2 equipment!

Quote:
Originally Posted by Newt View Post
I looked into the thread situation for the CO2 bottles and regulators before I spoke even thou I thought I knew the answer from doing piping for years, many years ago. They are what is called NPT = National Pipe Thread. Same as on piping. They do have a taper. Hydraulic lines tend to use ferrels to seal the connection. Pipe dope is used all the time on water, steam and gas.

pipe dope is perfectly fine on all those lines, infact its recomended. Those are also relativly low presure systems

On hydrolic or high presure lines it will get red taged and failed.( atleast in CA)
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Old 01-09-2010, 06:50 PM   #26 (permalink)
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Default Re: Things they never tell you about CO2 equipment!

Quote:
Originally Posted by Newt View Post
ashappard,
The only place I've ever seen teflon tape used on regulators is on the gauges and other connections. I've been in manufacturing engineering for over 25 years and seen lots of equipment. Teflon tape and various types of teflon paste and pipe dopes are used all the time on water, steam and gas piping. You do need to becareful not to overtighten.

As soon as I need to remove my MA957 to refill the bottle I will be removing the teflon tape.
just trying to keep the discussion relevant - I can understand all the myriad ways that piping connections are made -- in the case of regulator to cylinder, tape isn't advised when I talk to welders. These folks say need for tape means the reg isn't sealing proper, I cant really argue with that. I taped my MA957s for quite a while and took flack at the shops for it, but mostly shrugged it off, because the forum guys and my Milwaukee instructions said thats how to do it. So if anything hopefully this is a discussion about how to get a great seal without lots of hassle?

When I came across permaseals it was excellent. Quicker changeover, less worry about leaks and no more taping. I have had to change o-rings on permaseals. They get ragged after a while. Lucky for me, I got the shop I exchange tanks with interested in permaseals and they now stock the orings and the two brass pieces that make up the seal.

seems the board is lighting up recently with pressurized CO2 discussion. Nice.
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Old 01-09-2010, 07:43 PM   #27 (permalink)
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Default Re: Things they never tell you about CO2 equipment!

Maybe when I do my weekly maintenance on Monday on my 75 I will take the regulator off.It wont be empty for about a year. I'll take a picture of the nipple and nut connection used on that. No washers/seals, just brass on brass -never had a leak. I think its an argon/CO2 nipple with a female compesssion nut. It was being used this way on a CO2 tank some welders were using to weld 316ss pieces.
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Old 01-12-2010, 10:45 AM   #28 (permalink)
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Default Re: Things they never tell you about CO2 equipment!

I have a friend who has worked for years with medical O2 tanks, regulators, etc on a daily basis. He told me that we should never, ever use tape (or dope) on the high pressure connection between the cylinder and the regulator. Any of the low pressure parts are fine to be taped, though. I totally trust his 15 years of experience with high pressure gas systems.

Last edited by Sugar Cone; 01-12-2010 at 10:52 AM..
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Old 01-12-2010, 11:31 AM   #29 (permalink)
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Default Re: Things they never tell you about CO2 equipment!

My welding shop also says NO TAPE. I check with Orlando at Greenleafaquariums.com and he also said no tape. He also said no pipe dope.

What I know is that I don't tape, or dope. I use permaseals on two tanks and the nylon washer on the other. No leaks, they last a long time. It's working for me- not broke so I'm not gonna fix it.



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Old 01-12-2010, 12:47 PM   #30 (permalink)
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Default Re: Things they never tell you about CO2 equipment!

Yeah, I've never seen a taped connection for the regulator to the tank valve and I'm not sure why Milwaukee tells you to do so but its odd that after a tank hydrotest they always put new tape or dope the threads on the valve stem to the cylinder - steel anyway. I'm not sure about aluminum as you cant see the valve stem threads as it is a different style valve.
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