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.
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, from
many different causes. The most recent incident was in the last couple
days. 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.
The Washington Post also has a special report covering exploding
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
Multicast Technologies, Inc.
10301 Democracy Lane, Suite 410
Fairfax, Virginia 22030
Phone : 703-293-9624 Fax : 703-293-9609
e-mail : tme () multicasttech com
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