Word: steam
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...Contemporary China,” would have 50 students. About 170 enrolled, and Kirby had to hire teaching fellows at the last minute. It’s an experience he brings up frequently when discussing preregistration, an idea that has been kicked around since the 1970s, but only gained steam when Kirby made it a personal priority after he was chosen as dean...
...steam tunnels vary in size, but most are about eight feet high, eight feet wide, and situated six feet below the surface. Ten and 12 inch steam pipes run along each wall, their contents rushing along at around 400 degrees and 100 pounds of pressure. Four inches of insulation surround the pipes and, in conjunction with a ventilation system, maintain the tunnels at an acceptable temperature (although not a comfortable one, since workers often face 100 degree heat). In addition to steam pipes, numerous cables for internet and telephone pass through the tunnels, making them essential to the University?...
...main break in the tunnel system occurs at Mass. Ave., where the distance between the Red Line and the street is just over three feet. At this point, the Harvard steam tunnel becomes extremely narrow—the pipes have no problem getting through, but humans are forced to lie down on carts and propel themselves using a pulley system...
...high temperature and pressure, the pipes are extremely dangerous and must be highly maintained and monitored at all times. A break in the steam pipes would kill anyone nearby in the tunnels. The main liability is at the expansion joints, special fittings that prevent the pipes from buckling when the steam is turned on and off. During this transition, the pipes can expand six to nine inches over a 300 foot distance...
Despite being a below-ground phenomenon, the steam tunnels are the impetus for many above-ground constructions. The Weeks footbridge between Leverett and the B-School? It was built to carry the steam pipes when they were extended across the Charles in 1926; a three-foot high crawlspace allows workers to traverse the river inside the bridge. How about those weird mushroom things when you’re walking from the Yard to the Science Center? They let excess heat escape from the tunnels...