Heat engineering; a text book of applied thermodynamics for engineers and students in technical schools . ds and expansion joints are difficultto detect, but the saving from the elimination of these is muchgreater than the cost of that elimination. Although this leakagemay amount to a considerable quantity, the shutting down of theair pump does not mean an immediate loss of vacuum. In atest mentioned by Mr. Foran a condenser caring for 9000 kw. lostonly in. in 30 minutes. 336 HEAT ENGINEERING Orrok found that there was toomuch drop of pressure in the con-denser proper. To reduce thisthe co
Heat engineering; a text book of applied thermodynamics for engineers and students in technical schools . ds and expansion joints are difficultto detect, but the saving from the elimination of these is muchgreater than the cost of that elimination. Although this leakagemay amount to a considerable quantity, the shutting down of theair pump does not mean an immediate loss of vacuum. In atest mentioned by Mr. Foran a condenser caring for 9000 kw. lostonly in. in 30 minutes. 336 HEAT ENGINEERING Orrok found that there was toomuch drop of pressure in the con-denser proper. To reduce thisthe condensers should be madebroad and shallow. The dropamounted to about in. ofmercury, increasing with the loadto in. He found that thepower required for the air pumpcondensers amounted to about on the steam end for loadsbetween 6000 and 10,000 mechanical efficiency of thedry air pumps was about 50 percent, and the volumetric efficiencyworking between 34 lb- and 15lbs. was very low indeed, due partially to the low value of theclearance factor and to the large ratio of Fig. 163.—Shell and partitions ofa Wheeler dry tube condenser.
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