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Why does steam come out of manhole covers in some cities?

Question #101526. Asked by whee.

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Schoonie101 star
Answer has 3 votes
Currently Best Answer
Schoonie101 star
17 year member
103 replies avatar

Answer has 3 votes.

Currently voted the best answer.
Why does steam rise out of manhole covers?
Steam can come from manholes for several different reasons. The most common is water infiltration into the manhole. Water comes in contact with the hot steam main and causes vapor. Another source is leaks, either within the manhole or on buried piping between manholes. There is no "natural" venting process.

link http://www.coned.com/steam/kc_faqs.asp#two

Dec 07 2008, 1:02 AM
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