What aspects must be taken into account when installing flowmeters Coriolis effect?
The physical principle itself requires no special demands on available technology or equipment. With respect to mechanical installation is essential in strict compliance with manufacturer's instructions. The instruction set can vary significantly from manufacturer to manufacturer and even between different models from the same manufacturer. Generally speaking we can say that the Coriolis effect flowmeters E + H does not require special installation steps in the piping system.
However, some facilities may be desirable to ensure mechanical models in two points of the section of pipe, by sensitivity to vibration. Sometimes these differences can significantly increase the cost of installation.
To what extent the presence of gas in the fluid affects the measurement?
Often, fluids, particularly high viscosity, containing gas in bubbles. These gas bubbles have a dampening effect on the oscillations of the measuring tube. A corresponding increase in power oscillation damper counteracts this effect and thereby compensates for its negative influence on the measurement. Large gas intrusions are much more striking effects. As they pass through the flow meter, these intrusions may upset the stability of the oscillating system - in extreme cases, the measuring tube could even fail to oscillate, and the team tends to reduce the measurement accuracy. For this reason, wherever possible will be necessary to prevent the formation of gas bubbles. Viable options for this include increasing the process pressure or install exhaust gas.
How does the presence of suspended solids measurement?
The presence of suspended solids is not a problem while the mixture is homogeneous, so as to allow the solid particles oscillate in unison that the liquid and thus contribute to the measurement signal. The critical parameter is the ratio between the size of the particles (its inertia) and the forces of origin viscous (acceleration forces). Thus, in low viscosity fluids, the proportion of solid particles should be as low as possible.
A flowmeter measuring tube can be installed slightly bowed somewhat to avoid the accumulation of solid particles suspended in the curved tubes (eg, upright), particularly when the fluid does not circulate.
What sise measured without pressure in the pipe?
In a completely filled with fluid cavitation occurs when the system pressure drops below the vapor pressure of the medium in question. The selection and configuration software "Applicator" E + H, incorporates features that allow you to find out when cavitation is expected for a certain process conditions. In these cases, "Applicator" a warning shot.
What if the pipe is not completely full?
When the pipe is partially empty, it is not possible to measure the flow. In these circumstances, the oscillating system is unable to reach a stable state.
How do they affect the measurement of changes in the velocity profile?
The velocity profile has no effect on the measurement with a Coriolis flowmeter.
What effect does a piston pump in the measurements?
Piston pumps can cause severe cyclical fluctuations in flow or even small ebb, caused for example by the volume envelope or small leaks in valves or volume movements. The process conditions of this nature require measurement systems that react quickly to changes in flow in both positive and negative sense (reverse flows). The Coriolis mass flowmeters E + H have features that compensate for these fluctuations in the whole range of measured values and can correct the measurements in pulsating flow. A reciprocating pump causes rhythmic changes in the density in compressible fluids such as fluids containing gas. In these circumstances it is difficult to achieve a good level of accuracy in measurements. It is possible to rectify this situation by increasing the static pressure of the system or by installing expanders.
