Download pdf Nebraska Blue Print Volume 6

Nebraska Blue Print Volume 6 by University Of Nebraska Society

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1907 Excerpt: ...in part due to the fact that a large percentage of the business is on a small pipe farthest away from the station. If the load was properly distributed or the pipes installed to fit the load no such ranges would be required. This is one more trouble in steam systems of getting the pipes correctly proportioned because you can't always tell where the most business will come from as conditions are constantly changing. By referring to chart No. 3 one can get an idea of the variable load as the temperature varies. The amount of heat re quired depends upon three factors temperature, humidity and wind. The last two are of minor importance to the temperature. In these curves the readings were taken every week as shown. There is a striking resemblance between the temperature and consumption curves. The loss curve however does not seem to be governed by the temperature. It is about uniform regardless of temperature and the amount of heat used. In fact when the most heat was used-the apparent loss in the pipes was loss. This is due to the live steam used which being superheated re-evaporated some of the water in the mains. The percentage Of loss to the amount of steam carried varied from 6.4% to 25% during the time this test was run, which was from October 9, 1905 to March 27,1906. The average loss during this time was 10.4%. The loss from March 27 to May 15th was 47%. The loss in May was over 100%. These figures may seem confusing but when you consider that the loss in the streets for December and May is about the same but the amount of heat used in May is very small. It did not make any difference in the economy of the system whether this steam was lost in the streets or exhausted into the air. In fact it was economy because it gave one more exhaust pipe to the engi...

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