Did You Know? from MetroBlogging

MB_didyouknow-thumb.jpgEver notice those 5-foot tall compressed nitrogen tanks on the streets around the city? With all of the crazy stuff going on in the world these days, and with New York a perennial target of people who want to do us harm, the sight of an oblong, shiny metal cannister will always produce concern among the citizenry. But, though ominous-looking, the are actually quite necessary.

The various utility companies place these tanks above ground and run lines down into the infrastructure for a number of reasons. The most common use is to pressurize pipes, lines, and wires. Below NYC is a maze of water, sewage, heat, cold, and other elements, and pressurizing these delivery systems helps to keep the lines safe from the elements.

1 Comment so far

  1. shannon (unregistered) on August 2nd, 2007 @ 7:22 pm

    Finally, an answer to a mystery I’ve been worrying over for ages. I associate liquid nitrogen tanks with cryopreservation. Needless to say, I’ve been somewhat concerned about what ConEd might be growing ‘down there’.

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