Friday, 5 August 2016

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V Cone Flow Meter Working Principle :

The V­Cone meter like several other popular meters is a differential pressure (or “DP”) meter. These meters all work according to the same principle of DP flow devices. That is an obstruction in the pipe (i.e., a reduction in the cross sectional area available to the flow) causes an increase in flow velocity and a corresponding reduction in pressure. Hence be measuring the upstream pressure, the temperature and the difference in the static pressure between the upstream and the minimum cross sectional areas the flowrate can be determined as long as the fluid properties are known. The flow rate determination is done by applying the laws of conservation of mass and energy. However, there are important differences between the V­Cone meter design and other DP meter types. These differences give the V­Cone meter important performance advantages. These advantages include the ability of the V­Cone meter to operate with very short upstream and downstream straight pipe lengths, to create a low total pressure (or “head loss”), to create a very stable DP, to give a large turn down, to create relatively low signal noise and to cope well with liquid and particulates in the gas stream. Cone meters (e.g. V­cones) are proprietary meters and are essentially an inverted Venturi tube. Instead of a contraction in the pipe, the fluid flows around a central cone as shown in the following diagram.

Principle of Operation :