Things they never tell you about CO2 equipment! - Page 4 - Equipment - Aquatic Plant Central

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Old 01-15-2010, 06:04 PM   #31 (permalink)
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Default Re: Things they never tell you about CO2 equipment!

This is something that I wasn't told until I talked with my local welding supply ... The difference between dual (or two) stage regulators and single stage regulators. They are basically two regulators in one.





DUAL STAGE regulators reduce the source pressure down to the desired delivery pressure in two steps. Each stage consists of a spring, diaphragm, and control valve. The first stage reduces the inlet pressure to about three times the maximum working pressure. The final pressure reduction occurs in the second stage. The advantage of a dual stage regulator is its ability to deliver a constant pressure, even with a decrease in inlet pressure. For example, as a cylinder of gas is depleted, the cylinder pressure drops. Under these conditions, single stage regulators exhibit a “decaying inlet characteristic”; where the delivery pressure increases as a result of the decrease in inlet pressure. In a dual stage regulator, the second stage compensates for this increase, providing a constant delivery pressure regardless of inlet pressure conditions. The dual stage regulator is recommended for applications where a continuous supply of gas is required; such as the gas supplied to analytical instruments where constant delivery pressure is critical.






SINGLE STAGE regulators perform the same function as the two stage regulator using a single step reduction of source to outlet pressure. For this reason, the outlet pressure cannot be as accurately controlled as the source pressure decays. It is highly recommended that single stage regulators only be used in circumstances where the operator can monitor and adjust the regulator as needed or where the regulator is supplied a nearly constant source pressure.
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Old 02-15-2010, 07:42 AM   #32 (permalink)
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Default Re: Things they never tell you about CO2 equipment!

Quote:
Originally Posted by Tex Gal View Post
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.
I don't use either because my regulator uses a built in rubber O-ring that is on what I think is called the inlet nipple. It's the part that pressed up against the outlet hole on the Co2 tank when you tighten the nut. I checked for leaks and did not find any. It's now been over two months and I have to do my first tank refill.
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Old 03-24-2010, 07:28 PM   #33 (permalink)
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Default Re: Things they never tell you about CO2 equipment!

ive never taped the thousands of bottles of any gas(im a union ironworker) i have ever used!
they are straight threads they seal by the fitting internally.
all other connections can/should be taped. do not get tape on the insides of the connections.
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Old 03-25-2010, 07:23 AM   #34 (permalink)
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Default Re: Things they never tell you about CO2 equipment!

I use tape, I clean off the threads between each application and when I return bottles I clean them off. I don't see what harm plumbers tape is going to do to it.
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Old 03-26-2010, 08:01 AM   #35 (permalink)
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Default Re: Things they never tell you about CO2 equipment!

Quote:
Originally Posted by northtexasfossilguy View Post
I use tape, I clean off the threads between each application and when I return bottles I clean them off. I don't see what harm plumbers tape is going to do to it.
the harm is that the fitting isnt designed to seal at the threads. it can leak if you tape the threads.
you can split the fitting on the regulator taping the threads.
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Old 03-26-2010, 10:52 AM   #36 (permalink)
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Default Re: Things they never tell you about CO2 equipment!

There is nothing to seal the nut against the inlet nipple so, I don't think taping the threads will provide a tight seal. If it were to leak, it would most likely leak out of the back of the nut. The nut is only there to force the flat of the nipple against the valve in the cylinder. You need the washer or permaseal at the end of the nipple to form the seal.

Putting tape on the input might cause pieces of tape to enter the regulator. Putting tape on the output won't hurt the regulator but might cause pieces of tape to enter the solenoid.
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Old 03-29-2010, 05:34 PM   #37 (permalink)
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Default Re: Things they never tell you about CO2 equipment!

CGA-320 reads are not like NPT tapered threads that need pipe dope or Teflon tape for sealing. A washer fits between the male and female ends that forms a leak free seal when tightened properly.

From: http://fins.actwin.com/aquatic-plant.../msg00022.html
"Tape is neither necessary nor especially useful. It won't improve the seal and you shouldn't expect it to. The tank should have CGA 320 fitting on it with male threads and the regulator should have CGA 320 female fitting. CGA 320 fittings are *not* like standard pipe threads. With standard pipe threads, the tapered threads provide the seal and using tape or pipe dough helps ensure that the threads don't have any small gaps. But the CGA fittings *do not* seal at the threads! They seal where the flat faces of the two fittings meet and that's why you *must* have a fiber or nylon washer between the two -- to seal the joint where those to seats meet. In fact, applying tape makes it possible to bind the threads before the fittings are fully seated against the washer -- although it would take a lot of tape to do that. ..."

From: http://reefkeeping.com/joomla/index....between-part-1
"The valve used in the cylinder is typically made out of forged brass and in the US has a Compressed Gas Association (CGA) connection type 320 (see diagram) that requires a flat washer to provide the seal. This washer should be replaced every time the regulator is reconnected. Do not use Teflon tape or any other type of sealant but the washer. The company filling the cylinder can provide you with new washers. Note that there are different valve and connection specifications throughout the world, so insure you check your local specifications."
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Old 07-07-2011, 01:16 PM   #38 (permalink)
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Default Re: Things they never tell you about CO2 equipment!

Quote:
Originally Posted by northtexasfossilguy View Post
I use tape, I clean off the threads between each application and when I return bottles I clean them off. I don't see what harm plumbers tape is going to do to it.
The seal from the tank to the regulator is at the CGA 320 nipple and face of the valve on the tank. The threads have nothing to do with the seal and the tape can actually prevent you from tightening the nut adequately for a good seal, then it being high pressure even though it is sealed pieces of tape can get in the regulator and clog it or you can have a slow leak. I use tape or dope on any fitting where the threads actually act as part of the seal. Just my 2 cents.
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Old 11-05-2011, 07:00 AM   #39 (permalink)
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Default Re: Things they never tell you about CO2 equipment!

I've learned a lot from this post. Thanks for helping out a novice.
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Old 10-12-2012, 11:44 PM   #40 (permalink)
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Default Re: Things they never tell you about CO2 equipment!

Thank you for this post. Very helpful
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