Post by: Nick1911 on July 31, 2008, 11:22:14 AM
One thought on this (Which I know everyone is going to freak out at...) is to cut florescent tubes at each end, and use a solvent on the phosphor layer. It seems like a bad idea because of the mercury issue, although sources indicate that about 99% of the mercury is bonded with the phosphor layer. I'm also not sure what type of glass a florescent tube is, exactly.
A commercial source would be nice, but I haven't found anything that would cost a solid $100 for a 3-4 foot chunk.
Thoughts?
Edit: On a side note; finding "glass pipe" for sale on the internet tends to lead to online head shops.
Post by: K Frame on July 31, 2008, 11:25:22 AM
"laboratory supply glass tube" (or tubing)
Post by: Balog on July 31, 2008, 11:25:43 AM
http://www.us.schott.com/tubing/english/index.html
http://www.bd.com/accu-glass/
I see Mike beat me to it.
Post by: never_retreat on July 31, 2008, 11:27:29 AM
Post by: Nick1911 on July 31, 2008, 11:28:35 AM
Try googling this phrase
"laboratory supply glass tube" (or tubing)
"laboratory supply glass tube" (or tubing)
I will try that again. Everything I found in that market was either under 12 mm, or really, really expensive. (like $200 per 4 ft.)
Post by: Nick1911 on July 31, 2008, 11:30:01 AM
So what kind of crack pipe are you building? I guessing its going to be a high end product with the use of Borosilicate glass.
LOL. It's actually for some solar energy experiments. I'm working on a design for residential solar-powered HVAC. The pipe is needed for a prototype.
Post by: K Frame on July 31, 2008, 11:31:20 AM
Post by: Headless Thompson Gunner on July 31, 2008, 11:34:30 AM
Post by: charby on July 31, 2008, 11:35:40 AM
Why glass? Why not copper or somesuch?
Black plastic water pipe?
Post by: Nick1911 on July 31, 2008, 11:37:54 AM
Why glass? Why not copper or somesuch?
There will be a copper, or more likely aluminum heat pipe inside the glass pipe. The space between them will be evacuated to serve as thermal insulation. The higher temperature requirements of my chiller necessitate the extra design complexity.
Post by: Balog on July 31, 2008, 12:01:30 PM
Post by: seeker_two on July 31, 2008, 01:03:08 PM
Try googling this phrase
"laboratory supply glass tube" (or tubing)
"laboratory supply glass tube" (or tubing)
....just don't do it in Texas without the proper license....
Post by: GigaBuist on July 31, 2008, 01:37:53 PM
Quote
LOL. It's actually for some solar energy experiments. I'm working on a design for residential solar-powered HVAC.
Whoa. This dude is TOTALLY baked!
Post by: Scout26 on July 31, 2008, 02:22:34 PM
Ya know that Captain Hammer reads APS.........
Post by: 280plus on July 31, 2008, 04:24:37 PM
Post by: Sergeant Bob on July 31, 2008, 04:48:57 PM
Post by: 280plus on August 01, 2008, 02:50:06 AM
Look here:
http://www.viessmann-us.com/en/products/Solar-Systeme/Vitosol_300.html
The 20 tube array was quoted to me at $8000 HOWEVER you can buy the tubes individually, they are self contained. Don't know for how much though. Probably not too much more than buying the parts and fabricating them yourself.
Are you using ammonia in your chiller?
Post by: HankB on August 01, 2008, 03:47:48 AM
http://www.photonics.com/photonicsFind.aspx?searchString=glass%20tubing&searchIndex=34
A few places to start are:
http://www.spectraglass.com/products/tubular_glass_duran_single.aspx?Page=2
http://www.glassdynamicsllc.com/Tubes%20Cylinders.htm
http://swiftglass.com/index.php?option=com_content&task=category§ionid=4&id=29&Itemid=39
Don't know what the price is (you did say cheap) . . . but there, you're on your own.
Post by: alex_trebek on August 01, 2008, 04:42:17 AM
Post by: Nick1911 on August 01, 2008, 04:47:33 AM
Quote
Are you using ammonia in your chiller?
Yes, and it's making component and seal material choices difficult! Apparently ammonia + water gets past the oxide layer and eats aluminum parts.
Post by: K Frame on August 01, 2008, 05:05:07 AM
That and the overt toxcicity.
I'd suggest a small fan in your basement laboratory.
Post by: RocketMan on August 01, 2008, 05:08:02 AM
Want some help?
Post by: Balog on August 01, 2008, 05:47:17 AM
Post by: 280plus on August 01, 2008, 08:16:17 AM
One thing about ammonia, there's never any doubt as to whether there's a leak or not.
Post by: K Frame on August 01, 2008, 08:26:09 AM
Post by: JonnyB on August 01, 2008, 11:53:44 AM
I believe that it tends to run in the 1.25 to 1.5 inch inside diameter.
jb
Post by: K Frame on August 01, 2008, 11:57:28 AM
Lots of glass tubes on the big storage tanks to show tank levels.
Post by: Headless Thompson Gunner on August 01, 2008, 12:01:43 PM
Thanks for all the suggestions guys; now I have some sources I can start pricing.
Yes, and it's making component and seal material choices difficult! Apparently ammonia + water gets past the oxide layer and eats aluminum parts.
I can believe it. I've used ammonia to etch copper circuit boards in a pinch. It isn't ideal, but it does manage to dissolve away the copper. It's actually pretty cool to watch.
Quote
Are you using ammonia in your chiller?
Yes, and it's making component and seal material choices difficult! Apparently ammonia + water gets past the oxide layer and eats aluminum parts.
Post by: Nick1911 on August 01, 2008, 12:19:27 PM
Thanks for all the suggestions guys; now I have some sources I can start pricing.
Yes, and it's making component and seal material choices difficult! Apparently ammonia + water gets past the oxide layer and eats aluminum parts.
I can believe it. I've used ammonia to etch copper circuit boards in a pinch. It isn't ideal, but it does manage to dissolve away the copper. It's actually pretty cool to watch.Quote
Are you using ammonia in your chiller?
Yes, and it's making component and seal material choices difficult! Apparently ammonia + water gets past the oxide layer and eats aluminum parts.
I always used Hydrochloric acid and hydrogen peroxide mixed as an expedient etchant. It actually works very well, and both ingredients are cheap and available.
Post by: 280plus on August 01, 2008, 02:05:28 PM
Post by: Sindawe on August 01, 2008, 02:21:01 PM
Quote
I used to like throwing pennies in the nitric acid tank to watch them fizzle like alka seltzer and make orange smoke.
Green smoke is prettier, like that produce by dumping bleach into a mild acid solution. Just don't breath it. <Big Evil Grin>
If you're still looking for suppliers, I can vouch for Allen Scientific Glass ( http://www.allenglass.com/ ) for quality. Used to use them for flasks and transfer vessels back when I worked in Biotech since they are local (Boulder, CO).
Post by: Headless Thompson Gunner on August 01, 2008, 03:10:00 PM
Thanks for all the suggestions guys; now I have some sources I can start pricing.
Yes, and it's making component and seal material choices difficult! Apparently ammonia + water gets past the oxide layer and eats aluminum parts.
I can believe it. I've used ammonia to etch copper circuit boards in a pinch. It isn't ideal, but it does manage to dissolve away the copper. It's actually pretty cool to watch.Quote
Are you using ammonia in your chiller?
Yes, and it's making component and seal material choices difficult! Apparently ammonia + water gets past the oxide layer and eats aluminum parts.
I always used Hydrochloric acid and hydrogen peroxide mixed as an expedient etchant. It actually works very well, and both ingredients are cheap and available.
But there was one occasion where we needed a board for a group project, and we had to get it one that night. We managed to scrounge up some industrial strength ammonia cleaner from a janitor's closet. The stuff stank like all hell, but it got the job done.
Post by: The Annoyed Man on August 01, 2008, 03:16:42 PM
That's why they use cold rolled steel and stainless steel in them. They use uh, zinc chromate in the water solution to inhibit the steel being corroded by the water. Aluminum will not work. Nor will copper, brass etc.
One thing about ammonia, there's never any doubt as to whether there's a leak or not.
Tell me about it. Had a major ammonia leak at work one or two years ago. Had to evacuate the building and call in the fire department to sanitize the place One thing about ammonia, there's never any doubt as to whether there's a leak or not.
.
Post by: K Frame on August 01, 2008, 05:55:13 PM
Changing the bottles, if you spilled some?
Holy crap!