· Get a Cloudy Nights T-Shirt · Submit a Review / Article Click here if you are having trouble logging into the forums Privacy Policy | Please read our Terms of Service | Signup and Troubleshooting FAQ | Problems? PM a Red or a Green Gu… uh, User You are not logged in. [Login] Entrance · Main Index · Search · New user · Who's Online FAQ · Calendar Equipment Discussions >> Binoculars Previous   Index   Next   Threaded   Pages: 1 | 2 | 3 | 4 | (show all) Jarrod sage Reged: 01/20/13 Loc: SE USA Re: Nitrogen filled verses non-nitrogen binos [Re: KennyJ]       #5654767 - 01/31/13 05:46 PM Edit   Reply   Quote Quick Reply   Big respect for that, Kenny. I have a good fraction of my savings invested in North American NG pipes. It's a great industry. I used to have BP as well, before the accident.... Very interesting to read your comments on purging pipe. I imagine those considerations are big-time important before you contemplate putting an acetylene torch to a pipe that had pressurized, flammable substances flowing through it! Edited by Jarrod (01/31/13 05:50 PM) Post Extras:       KennyJ The British Flash Reged: 04/27/03 Loc: Lancashire UK Re: Nitrogen filled verses non-nitrogen binos [Re: Jarrod]       #5654896 - 01/31/13 07:01 PM Edit   Reply   Quote Quick Reply   Thank you,Jarrod. As you implied,it's ONE thing sitting around well crafted tables in plush surroundings,wearing expensive suits,drinking fine coffee from the best china cups,TALKING about a potential problem,but it can be somewhat different out on the front line,freezing private parts off or sweating like a pig,heart beating like a drum,whilst actually putting the theories into practice,knowing that any mistake can literally spell the end of existence for more than just yourself. Of course,repairing binoculars is not quite such a potential "life and death" profession,but again,there are far fewer people who actually carry out the work professionally than there are who seem to enjoy speculating about it! Kenny Post Extras:       BillC on a new path Reged: 06/04/04 Loc: Lake Stevens, WA, USA Re: Nitrogen filled verses non-nitrogen binos [Re: KennyJ]       #5654916 - 01/31/13 07:13 PM Edit   Reply   Quote Quick Reply   Everybody put your hands on the computer screen and say Amen! BillC Post Extras:       RichD Carpal Tunnel Reged: 11/08/07 Loc: Derbyshire, UK Re: Nitrogen filled verses non-nitrogen binos [Re: BillC]       #5655620 - 02/01/13 06:11 AM Edit   Reply   Quote Quick Reply   very interesting Kenny Post Extras:       Jon Isaacs Postmaster Reged: 06/16/04 Loc: San Diego and Boulevard, CA Re: Nitrogen filled verses non-nitrogen binos [Re: Jarrod]       #5655894 - 02/01/13 09:25 AM Edit   Reply   Quote Quick Reply   A few thoughts: - Bicycle inner tubes are an example of the diffusion of air through butyl rubber. A standard 700C-23 tire pumped to 120psi will lose enough pressure that it will need to be pumped up within a week or so. Bicycle tires are operating at high pressures, with large surface areas, are quite thin and the enclosed volume is relatively small. - Binoculars are quite a different situation. There is very little pressure differential driving the diffusion, there may be none. I suspect Jarrod is correct, the reason for the purging is to dry the internals of the binoculars, the purpose of the O-Rings is the prevent moisture from entering the binoculars. In my line of work, when I want something to be really dry, I hook it up to a vacuum pump and pull it down to micron levels... Jon Post Extras:       Binojunky Carpal Tunnel Reged: 12/25/10 Re: Nitrogen filled verses non-nitrogen binos [Re: Jon Isaacs]       #5656378 - 02/01/13 01:33 PM Edit   Reply   Quote Quick Reply   Talking about sealing stuff, a few years back I pulled apart a VW air cooled motor and the cylinder head mated to the cylinder barrels with no gasket of any sort, not sure of the PSI when the piston was a TDC but it worked.DA. Post Extras:       Pages: 1 | 2 | 3 | 4 | (show all) Previous   Index   Next   Threaded   Extra information 9 registered and 37 anonymous users are browsing this forum. Moderator:  knuklhdastnmr, panhard  Print Thread Forum Permissions       You cannot start new topics       You cannot reply to topics       HTML is disabled       UBBCode is enabled Thread views: 2756 Jump to *Announcements and News* -----   Cloudy Nights Announcements   Discussion of CN Articles, Reviews, and Reports   Celestial Events*General Astronomy* -----   Beginners Forum   General Observing and Astronomy   Outreach   Light Pollution*Equipment Discussions* -----   ATM, Optics and DIY Forum   Binoculars   Binoviewers   Cats & Casses   Classic Telescopes   Equipment   Eyepieces   Mounts   Observatories   Reflectors   Refractors    Video and Electronically Assisted Astronomy*Astrophotography and Sketching* -----   Beginning and Intermediate Imaging   Film Astrophotography   DSLR & Digital Camera Astro Imaging & Processing   CCD Imaging & Processing   Solar System Imaging & Processing   Sketching   Astro Imaging/Sketching Contest *Observing* -----   NEO   Planetary and Solar System Observing   Lunar Observing   Deep Sky Observing   Double Star Observing   Solar   Variable Star Observing and Radio Astronomy*Telescope Specific Forums* -----   Celestron NexStar    NexStar GPS / CPC Telescopes   Questar Forum   Meade ACF/RCX / LX / GPS    Meade ETX*Speciality Forums* -----   Arizona Science and Astronomy Expo   NEAF (Northeast Astronomy Forum) and NEAIC (Northeast Astro Imaging Conference)   AstroArt   Astronomy Clubs and Star Parties   Astronomy Software & Computers   AstroWebsites   Science! Astronomy & Space Exploration, and Others   Space Rocks   Stellar Media*Swap and Shop* -----   Shop and Swap Audio Components*CN Feedback and Vendor Announcements* -----   Vendor and Group Announcements*International Year of Astronomy 2009 - Forums are now closed.* -----   IYA Archive Info CN Forums Home

Cloudy Nights LLC Cloudy Nights Sponsor: Astronomics