Just wiped out a tank of fish - Page 6 - Equipment - Aquatic Plant Central

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Old 04-01-2007, 04:18 PM   #51 (permalink)
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Default Re: Just wiped out a tank of fish

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Originally Posted by furballi View Post
Yes, the more expensive 31 series "S" Swagelok valves are good, but they also cost an arm and a leg. These units are rated up to a maximum flow coefficient of 0.004 at 10 turns.

The Ideal 32 series -1- are rated at 0.0019 with 20 turns. I like the 1/8" female NPT connections. Pipe threads are very strong and provide a bubble tight joint without much hassle.
Is the Ideal series the Swagelok?

Are those type of connections something I could use with any valve I buy?

It's hard to keep up with you guys when specs. and features are mentioned with no frame of reference for them.

I'm sure you 2 are following each other, but some of us bystanders may not be.
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Old 04-01-2007, 07:24 PM   #52 (permalink)
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Default Re: Just wiped out a tank of fish

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Originally Posted by aman74 View Post
Is the Ideal series the Swagelok?

Are those type of connections something I could use with any valve I buy?

It's hard to keep up with you guys when specs. and features are mentioned with no frame of reference for them.

I'm sure you 2 are following each other, but some of us bystanders may not be.
In general, a needle valve with lower Cv and higher # of turns will give you more flexibility when metering the CO2 to your tank. If you have extra $ to spend, then go with the Ideal 52 series -1- straight body brass valve. I believe it is one of the best needle valve under $100. You can buy the Ideal valve by contacting the manufacturer or through Mc Master Carr. You can also purchase 1/8" brass female NPT connectors from Mc Master Carr to attach this valve to your regulator and your CO2 line. BTW, Mc Master is a very good source for many needle valve interconnects.

Swagelok is another mfr of needle valve. They use another type of connector that can be a little challenging for the novice aquarist. Good Swagelok stuffs will cost more than $100.

The Fabco NV-55 uses 10-32 threads at the inlet and outlet ports. Again, get the appropriate interconnects from Mc Master Carr. This valve should work well with virtually all tanks.

The KING of needle valve is probably Parker's HR-0 needle valve. It is wickedly expensive (+$170), but it can be customized with many types of connections.

http://www.idealvalve.com/brassvalves.htm

http://www.fabco-air.com/pdf/Sec_12.pdf
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Old 04-01-2007, 08:46 PM   #53 (permalink)
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Default Re: Just wiped out a tank of fish

Thanks for the followup.

I have to be price conscious, but always try to find that bang for your buck product. Sounds like the Fabco will be it.

Are the 10-32 fittings sufficient enough to hang other hardware off of like the bubble counter? I think I read a post somewhere that suggested that it would be best to run the counter off of the tubing if using that size fitting.
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Old 04-01-2007, 09:25 PM   #54 (permalink)
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Default Re: Just wiped out a tank of fish

I inject the CO2 into my filter's intake tube. That's my bubble counter. The 10-32 fitting is strong, but you can crack it by applying too much force at one end. A short 1" tubing would act like a flex joint to reduce stress on the connector. You may be able to obtain a sampler from a local distributor.

Fabco's NV-55 is the best needle valve under the $30 price range.
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Old 04-02-2007, 04:29 AM   #55 (permalink)
 
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Default Re: Just wiped out a tank of fish

I don't recommend hanging things off the 10-32 connectors. I work with them on an almost daily basis and they just don't take a lot of stress. It's very easy to even shear them off by over tightening them. And I have seen a lot of them get cracked or broken by a pet or child yanking on the tubing.

Brass is soft. 10-32 brass threads with a hole through them are very soft.
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Old 04-03-2007, 03:48 PM   #56 (permalink)
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Default Re: Just wiped out a tank of fish

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Originally Posted by benjavan View Post
I have been following the sometimes heated debate on wether or not to run a CO2 system at night or to supliment O2 with an airstone or powerhead at night and wether or not we are putting our fish at risk. I realize that in a well balanced tank with everything running smoothly, a CO2 system running at night should not deplete O2 levels to a dangerous level or cause a major fluctuation in pH.

But, what if something goes wrong? I have a beautifuly planted 55g tank that had, I emphasize had, a great little population of micro and dwarf rasboras. It was filtered by a HOT magnum. Thursday night we had some storms go through and lost power for about an hour. The HOT magnum decided not to fire back up. Today, I found most of my cool little fish floating with a few staglers gasping for their final breaths. I may save 4 out of about 12 of the fish.

A small air pump with an airstone and a timer could have prevented this tradjedy. It also would have been much cheaper than replacing the fish.

A UPS is your best insurance against this happening again......DC
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