Steam explosion NYC

The steam is pumped under the city because it means that the people of New York can have hot running water without having to rely on boilers. It works in two ways because it means in winter snow melts off the roads and pavements than it would do otherwise :)

I dont understand - Why is steam pumped under the city?

yea it is called water hammer.water hammer is when cold water comes in contact with the pipe causing the steam inside the pipe to condense into water and increase the pressure locally

it happens when a steam bubble travels up a pipe water logged as it condenses it slings a few hundred pounds of water in speeds of 150mph and when it reaches a T or a U joint it can easily break through and shatter through 1/2 thick black steel. cast iron/copper should not be used on steam.

few hundred pounds of water in speeds of 150mph? this is steam. and again, condensing steam would be a decrease in pressure-.-

what? do you know what your talking about? first, a water hammer is when you close a valve quickly and because water doesn't compress easily, it sends shock waves through the pipe, second, condensing steam would cause the pressure to decrease. if it was water freezing that would be a different story, but this is a "Steam explosion NYC", so next time don't post something on you tube if your just going to be stupid

ahhh New York, never a dull moment ;3

wtf when did this happen???

summer 2007