Book Description

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1922 edition. Excerpt: ...and the differential increased from 16 inches to 30 inches without any change in the valve C, consequently without any increase whatever in the amount of steam passing through the orifice. After the compressor was started the differential reading again increased without any increase in the amount of steam passing through the orifice. Inasmuch as the increase of differential was not due to an increased flow of steam, the effect was due to the pulsation occasioned by the opening and closing of the slide valves of the generator and compressor, both of them being reciprocating units. It is noted that prior to the test when the machines were not operating that the differential arm remained at zero when there was no steam passing through the orifice, and that after valve C was closed, when there was no steam passing through the orifice, that a differential pressure of approximately 9 inches of water was recorded, due to pulsation only. This differential continued as long as the generator and compressor operated at a uniform speed. The static pen arm in previous tests vibrated over a range of 10 to 15 Ib. with a frequency of the opening and closing of the valves of the reciprocating units when they were operating. To lessen this vibration a dash pot was attached to a static pen arm producing the smooth lines as shown. The effect of partially closing the valves on the gauge lines also produced a smooth pressure reading but gave erratic differential readings. In all cases when the gauge line valves were fully opened the differential reading was very uniform without any appreciable vibration. The weight of steam passing the orifice checked with a differential reading of 16 inches for the total period of the test, so that the flow corresponded to...