T. Cousins, B. Griffith
The paper describes a series of tests, which were initially intended to investigate performance of a two plane multi-path meter in the presence of severe swirl. With the two plane design it was clear that detailed data could be produced showing the level of the swirl, its changes with distance along the pipe and even the changes in position of the swirl centre. Most of the work previously on swirl had been conducted at high Reynolds numbers, and the assumptions were made that it takes the same form, possibly until the transition and laminar regions. The tests described range from a Reynolds...
Jan G. Drenthen, Marcel Vermeulen, Martin Kurth, Hilko den Hollander
Over the past decade, Ultrasonic flow meters have gained a wide acceptance. Main reasons for this are the high repeatability in combination with zero pressure loss and extensive diagnostic features. During this period meters with different path configurations have been put into the market, each of them trying to obtain the highest accuracy. Many of them show (often after multipoint linearization) almost perfect straight lines with errors close to the repeatability of the lab. However, for a user it is not only important how good his meter is at the lab, far more important is the accuracy...
William Johansen, Thomas Kegel
Check meters are commonly used by calibration facilities to monitor system performance. Check meters at the CEESI Iowa Natural Gas High Flow Facility have been installed in two different configurations: permanently installed check meters upstream of the customer meters and check meters installed downstream of the customer meters in variable configurations. The data from two 12” ultrasonic check meters normally placed downstream of customer meters will be examined to investigate the effect of velocity profile on the performance of ultrasonic flowmeters.
Bryan Trostel, Joel Clancy, Thomas Kegel
Currently no recalibration interval has been recommended by ultrasonic meter manufacturers or required by the AGA in the United States. Ten years ago the natural gas industry in the United States began acquiring ultrasonic flowmeters. A large amount of data has been collected over the past few years detailing how the performance of an ultrasonic flowmeter is affected by use in the field. The data from 35 meters calibrated at CEESI Iowa will be analyzed to investigate the effects of time on the performance of ultrasonic meters.
Ju. V. Mikhailova, S. I. Kuznetsov, I. D. Velt
In the paper, two methods are considered of exact measurement of the metal containing pulp mass. The first one consists in the continuous measuring of the pulp magnetic susceptibility and subsequent automatic correction when calculating the dry solid matter of the metal containing product. The second one provides for use of the special electromagnetic mass flow meters insensitive to the variations of the magnetic properties of the medium measured. The paper presents the technical solutions providing an additional electric signal characterizing the pulp magnetic susceptibility. Presence of...
Tao Meng, Chi Wang, He-ming Hu, Hai-bin Chen, Tao Zhuang
The accuracy of ultrasonic flowmeter is closely related to flow field on the job site. Because the hydro turbine intake penstock of Three Gorges power station is very large and specially shaped, the flow field at position of ultrasonic flowmeter installed and its effect have a lot of uncertainty. A model pipe system and a model meter with 500 mm diameter were designed and machined according to penstock of Three Gorge power station. The characteristics of velocity distribution were sketched from flow rate tested by each path at different altitude of the flowmeter, while the dispersion of each...
Anderson Ilha, Mauro M Doria, Valter Yoshihiko Aibe
In order to minimize the uncertainty arising from measurements of volume provers, we consider the thin liquid films that form inside the prover's inner surfaces, such as the interior walls of standard tanks and bell provers. These thin films adhere to the surface and may carry a given amount of mass and volume which can impact on the prover-side measurement uncertainties.
Valmir Ruiz, Marcos Tadeu Pereira, Nilson Massami Taira, José Fintelmam, Danieli Guimarães
The article describes the calibration of petroleum products provers with a compact prover as reference (master prover), using the same fluid in the same conditions as used in the process line.
Rainer Engel, Hans-Joachim Baade
In liquid flowmeter calibration, the fluid density is one of the major quantities which impact the uncertainties in the measurement process of calibration. Thus, the in-process density determination in liquid flow standards reveals to be an essential component in the measurement uncertainty analysis. In the case when a volume-reading flowmeter is calibrated against a gravimetric reference system, the accurate density value of the actual fluid applied in the calibration facility must be available, by measurement or computation, in order to convert the respective volumetric meter reading into...
Li Chuanjing, Chen Yunqi, Guo Aihua, Wang Jizhong, Yue Jian, Gu Shunfeng
To enlarge the calibration capacity of existing air flow test bench in SIPAI with turbine master meters traced to bell prover, a newly-designed 4500 m³/h flow test bench using critical nozzles as secondary standard traced to pVTt primary standard is successfully paralleled to the existing flow test bench for doubling the flow rate of original calibration capacity. It is proved that not only different secondary standards in kind, traced to both volumetric and gravimetric standards respectively, can be integrated to form an entire flow test bench, but the dependability of the test bench can be...