Word: steam
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...Steam from the Cambridge Electric Company's boilers enters the three pipes in the Tunnel at a pressure of one hundred pounds per square inch and a temperature of 425-430 degrees Fahrenheit. (Depending on the needs of the University, one or more of these pipes may be shut down.) After going through reducing valves which lower its pressure to about five pounds per square inch, the steam travels to individual buildings where it heats tanks of water. The Houses and most other buildings outside the Yard have their own water reservoirs, including separate tanks for domestic hot water...
Within the Yard, however, water for all buildings comes from a central supply which is heated in and distributed from the Weld operating station. At all times, both in the Yard and outside, the steam remains within a closed network of pipes; but in the process of giving up heat much of it condenses to distilled water. This condensate is collected and pumped (through a small pipe on the floor of the Tunnel) back to the Western Avenue power plant where it is again converted to superheated vapor...
...conventions, mostly held in May and June. In these the active party worker, not the ordinary voter, has the final say. Thus, while the conventions have none of the splash of a big primary and rarely attract television cameras, they do manage to generate a good deal of political steam...
...extreme down to a comparatively balmy low of 90. The sources of all this heat turned out to be three large pipes along the walls, two ten inches in diameter, one twelve inches. Though encased in heavy insulation, each radiated considerable heat for the simple reason that the live steam inside was over 400 degrees...
...walked south toward Widener Library, Harry Schofield pointed out some of the Tunnel's sights. He first called out attention to the large expansion joints that occurred at regular intervals along the steam pipes. These, he explained, allow for horizontal expansion when steam is turned on; without them, the rigid metal pipes would buckle disastrously due to sudden increases in temperature. Because the joints are the most likely sites for leaks to develop, they must be inspected and maintained continuously, and are one of the main concerns of the Tunnel engineering force...