Pipeline Flow Rate Measurements: Intercomparison Tests of Current Meters and a Multipath Acoustic Flowmeter.

摘要

ENEL (Italian National Electricity Board) compared the multipath travel time acoustic flowmeter, AFM, of Ferranti O.R.E. Accusonic Division, with current meters used at the Porto Tolle thermoelectric power plant, Italy. The pipe diameter was 3.2 m and average velocity varied from 1.5 to 3.4 m/s. During the first test, current meters and the AFM were installed respectively 40 and 35 diameters downstream of a 90 degree bend. The difference of the flow rate between the two systems varied from 0.8% at minimum velocity to 0.2% at maximum velocity. During the second test, the current meters were compared with two installations of crossed planes. One was installed upstream of a 90 degree bend and the other was installed immediately downstream. The first gauging section had a straight pipe length of 75 diameters and the second, 1.4 diameters. The current meters gauging section had 79 diameters of straight pipe. Very good agreement resulted not only for the acoustic flowmeter installed upstream of the bend, but also for that installed immediately downstream.