Mechanical laboratory methods; the testing of instruments and machines in the mechanical engineering laboratory and in practice (1922)
Smallwood, Julian Chase · New York, D. Van Nostrand company · leaf 373
= suction gage reading, inches of mercury or pounds persquare inch;h = manometer reading, inches of mercury. Also let d and d represent the distancesin feet between the gages as shown by Fig.111. Assuming the diameters of the dischargeand suction pipes equal, the velocity headsin these pipes will… … WD = WX2.3Pd+d-WX(-1.13p8), and D = 2.3Pd+d+1.13ps, (1) Fig. 111.—Measure-ment of Head. which relation is to be used when thesuction pipe pressure is read with a vac-uum gage. Similarly, D = 23Pd+d+l.l3h, .... (2; which is the appropriate relation when a mercury manometer isemployed. 70…
Mechanical engineering
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