Compressed air; theory and computations . ompressed air in volume V at pressure125 can be used without any reduction of pressure. Whatvolume would give 100 hp. for 1 Then 100 X 33,000 X 60 = paVa log , whence Va = 43,700 and V = 5,150 or about one-tenth of thatrequired under the first assumption. This latter condition (making the entire volume of compressedair available without reduction of pressure) can be accomplished 90 COMPRESSED AIR simply and economically by the scheme illustrated by Fig. 18which needs but little explanation. The water head against the air may be assumed constant
Compressed air; theory and computations . ompressed air in volume V at pressure125 can be used without any reduction of pressure. Whatvolume would give 100 hp. for 1 Then 100 X 33,000 X 60 = paVa log , whence Va = 43,700 and V = 5,150 or about one-tenth of thatrequired under the first assumption. This latter condition (making the entire volume of compressedair available without reduction of pressure) can be accomplished 90 COMPRESSED AIR simply and economically by the scheme illustrated by Fig. 18which needs but little explanation. The water head against the air may be assumed dip down in the water pipe below the air reservoir is toprevent blowout through the water pipe should all the water beforced out of the air reservoir. A popoff, or an automatic, stopfor the compressor, would be adjusted to act when the water linedropped down below the air tank as at C. Evidently the waterpipe ABC need not be vertical nor in a vertical plane. The waterreservoir can be economically placed on a hilltop in the neighbor-. Fig. 18. hood, or the air reservoir can be placed in underground chambers(abandoned chambers in mines, for instance) and the waterreservoir at the surface. This last suggestion naturally leads to that of using under-ground chambers naked, that is, without the steel tanks. Thisis quite feasible. To make the walls of such a chamber tightagainst escape of air into the rock the cement-gun is that there is no necessity for smooth or even cement-gun may be found more efficient if used while thechamber is under some pressure. The cement will thus be driveninto every crevice and pore into which air may tend to escape. CHAPTER VIIIFANS Art. 47.—The discussion in this article will apply to anycentrifugal pump and to fans of the low-pressure type such asare applied in ventilation of mines and buildings, when changein density of the air may be neglected. Though the discussion is brief, the student entering the subjectfor the firs
Size: 1552px × 1610px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublish, bookpublisheretcetc
