. A new thermo-electric fluid-meter and hot-wire anemometer. useful, and the ezample given belov/ illustrateshow the discharge ifi calculated. The Pitometer isset so that the velocity is determined for thepoints indicated in figure 21, The pipe cooffioiontbeing first determined as in the example, i*-. is sub-sequently necessary only to get a reading for thecenter of the pipe and apply the coefficient to thecenter velocity to obtain the mean velocity and hencethe discharge by the formula: Q s K 0 Vq A cubic feet per second. The principal use of the Pitometer is formeasuring the flow in water ma
. A new thermo-electric fluid-meter and hot-wire anemometer. useful, and the ezample given belov/ illustrateshow the discharge ifi calculated. The Pitometer isset so that the velocity is determined for thepoints indicated in figure 21, The pipe cooffioiontbeing first determined as in the example, i*-. is sub-sequently necessary only to get a reading for thecenter of the pipe and apply the coefficient to thecenter velocity to obtain the mean velocity and hencethe discharge by the formula: Q s K 0 Vq A cubic feet per second. The principal use of the Pitometer is formeasuring the flow in water mains where it has provedits great value in detecting leaks and ^waste, and inmeasuring the slips of pumping engines. It can beinstalled and operated for a relatively small expense,without interfering with the flow, ior large pen-stocks, and in silt-bearing water it is not used in old pipes allowance must be made forincrustations reducing the cross-sectional area and atraverse of several points through more than one P/ia£//S. S£yf£^ 119 diameter is preferable to the single observation andthe use of the pipe coefficient. The use of the Pitometer may best beillustrated by the following example given in con-Junction with figure TOTAL :Ring I: king iAreaSquareFeet King VelocityFeet per Se-cond King Volumes : of Flow Cubic : Feet per Se- : cond ; ! A • 50E • 788 : : B • 873 1,632 1 : C • 698 1,431 : : D • 780 2 .IS 1,570 : : E • 349 2,24 • 781 : ? ? !1 fotsl Discharge 6,202 : Mean Velocity = Total Discharge 6,202 ?, q„ 4,4. 1 Total Area - 3,l4S - ^^^ ft,/sec. Pipe Coefficient = ge^A JPl^l^yi - I- - ^,*^,? - .879 Center Velocity V^ ~ 27r? - •^ Values of deflection and velocity for 24 inch supply main. •if.^^^ TAHLE NO. 11. 120 TRAVERSE TABLE FOR PITOMETER TESTING,SHOWING INITER DIMETER OF EACP RING FOR OFDTITARYSIZES OP MAINS IN INCHES; AILD GIVING THE AREA OPE
Size: 1097px × 2278px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, bookidnewthermoele, bookyear1920
