nanog mailing list archives
Re: manhole covers
From: Marshall Eubanks <tme () multicasttech com>
Date: Fri, 21 Feb 2003 20:50:21 -0500
The interesting thing is that this happens every few weeks (at least - sometimes multiple times per week), and generally they don't know why. Not in Adams Morgan. Not in Foggy Bottom. Not even in Georgetown Heights. Only in Georgetown, Its become a local joke. Regards Marshall Eubanks On Thursday, February 20, 2003, at 05:43 PM, Sean Donelan wrote:
Check out Georgetown in Washington DC, the exploding manhole capital of the world. They have a lot of experience with exploding manholes, frommany different causes. The most recent incident was in the last couple ofdays. There is a lot of energy in being pumped into utility lines. A short circuit can release that energy into the underground vaults, and blow the manhole cover a considerable distance. http://www.washingtonpost.com/wp-dyn/articles/A33073-2003Feb19.htmlThe Washington Post also has a special report covering exploding manholeshttp://www.washingtonpost.com/wp-dyn/metro/specials/manholes/ On Thu, 20 Feb 2003, Allen Hamner wrote:I am a chemist who consults with the mayor of Bluefield WV where an incident two weeks ago (a cold day) blew a 70 pound iron cover 10 feet from an conduit tunnel containing several public untility lines. We believe we can exclude a natural gas leak. Rumor has it that hydrogen is involved, which may arise by electrolysis (?) or pyrolysis of insulation (?). A previous incident had done no damage but this explosion destroyed a nearby plate-glass window. There is no coal in the area so mine gas seepage is excluded. Sewer gas is tentatively not an issue. The source of the spark is unknown. I would like to participate in the exchange on this topic. Allen Hamner (Ph.D.) hamner_a () wvwc edu
T.M. Eubanks Multicast Technologies, Inc. 10301 Democracy Lane, Suite 410 Fairfax, Virginia 22030 Phone : 703-293-9624 Fax : 703-293-9609 e-mail : tme () multicasttech com http://www.multicasttech.com Test your network for multicast : http://www.multicasttech.com/mt/ Status of Multicast on the Web : http://www.multicasttech.com/status/index.html
Current thread:
- Re: manhole covers Sean Donelan (Feb 20)
- Re: manhole covers Marshall Eubanks (Feb 21)
- Re: manhole covers Allan Liska (Feb 21)
- Re: manhole covers blitz (Feb 22)
- Re: manhole covers Allan Liska (Feb 21)
- Re: manhole covers Marshall Eubanks (Feb 21)