The use of dry calibration for modern flowmeter technologies may offer a way to reduce the frequency and cost of wet calibrations. This paper contrasts the acceptability of dry calibration for the orifice plate with the use of dry calibration for modern flowmeters. Some background to dry calibration is reviewed, in particular for the electromagnetic flowmeter (EMFM). Suggestions have been made to achieve dry calibration in modern flowmeters, and the paper explores how this might be achieved in various designs. Some new strategies are discussed for dry and in-situ calibration. It is concluded that dry calibration techniques should be reconsidered and incorporated within the design and manufacture of meters, and combined with e-calibration.

The essay combines the experiences of the testing practice and analyses the practical applied effect, aims at the various big-bore heat meters and heat metric equipments which were largely applied in the concentrated heat-supply pipe networks of urban areas. Meanwhile, it probes detailed in the component verification/calibration methods of heat meters and their relative equipments, such as flow sensor, transforming unit and the secondly calculated meters, etc.

One coin has two sides. The three Test methods have their advantages and disadvantages. In ours more than 2 years testing LPG dispenser experience, comparing the two test methods. Master meter Test Method fit in with the gas station and producer LPG dispenser. Gravimetric Test Method fit in with lab. The reasons and the truth. Compare to the methods.

This paper describes a detailed study, covering analytic as experimental aspects, about the effect on a commercial Woltman meter of different hydraulic fittings and configurations such as butterfly and gate valves. Firstly, a three-dimensional numerical simulation using computational fluid dynamics techniques (CFD) is used to calculate the alteration of the velocity profile by upstream fittings. Afterwards, the theoretical analysis undertakes the study of blade forces and torques generated by the fluid flow (Baker, 2000). Finally, laboratory test validates the analytical procedure proposed.

A detailed numerical model has been developed to simulate the single straight tube Coriolis flowmeter, which includes all important practical features. The measuring tube is modeled as fluid-tube interaction elements characterized as mass, stiffness and damping matrices based on the theories of fluid-structure interaction and finite element method. Other features, such as the inner and outer cases and the driver spring as in Krohne OPTIMASS flowmeters, are modeled as standard ANSYS beam and shell elements and coupled to the measuring tube. The modal frequency and phase shift from experiments are used to validate the model. In particular, our results show that the modal behaviour of the meter can only be adequately modeled if these practical features are included.