Path: utzoo!attcan!uunet!cs.utexas.edu!sun-barr!texsun!texbell!vector!telecom-gateway From: claris!apple!netcom!onymouse@ames.arc.nasa.gov (John DeBert) Newsgroups: comp.dcom.telecom Subject: Re: Tanks near Telephone Poles Message-ID:Date: 9 Aug 89 19:12:53 GMT Sender: news@vector.Dallas.TX.US Organization: NetCom Services - Public Access Unix System (408) 997-9175 guest Lines: 21 Approved: telecom-request@vector.dallas.tx.us X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@vector.dallas.tx.us X-TELECOM-Digest: volume 9, issue 285, message 10 of 11 In article , claris!apple!netcom! wasilko (Jeff Wasilko) says: > I've seen compressed gas cylynders near poles and I've always wondered what > purpose they are used for? Could anyone shed some light on this? I have seen them too. To satisfy my curiousity, I examined one closely. It appears to be either nitrogen or compressed dry air attached via a pressure regulator to a fitting on a cable or splice cover. The prupose appears to be to force out water and moisture to prevent corrosion. A yellow cylinder contains compressed air and one that is silver with green at the top is nitrogen gas. Once or twice, I have seen helium cylinders (silver with orange) in place, perhaps because nothing else was available(?) Compressors can also be found, especially in remote areas, used also to keep cables and connections dry. JJD onymouse@netcom.UUCP