Combustion Research Associates manufactures differential producer type flow
meters for gas and liquid flow measurement.Working Principle Of Flowmeter
The flow-meter offered is differential producing flow-meter and is most widely used in industry for flow measurement applications.
The meter consists of three separate major devices that act on combination to measure the flowrate. The first device is differential producer, a PRIMARY device called VENTURI or ORIFICE PLATE which generates differential pressure proportional to flowrate. The second device is DIFFERENTIAL PRESSURE TRANSMITTER, which measures this pressure and generates signal, which is proportional to the flowrate. The third device is the rate indicator and recorder (optional) which gives the flowrate and totalised flow in desired engineering unit.
Basic Principle
The underlying principle of all differential –producing flowmeters is Bernaulli’s streamline energy equation. When the flow is contracted, either gradually or abruptly, kinetic energy increases increases at the expense of available potential energy (static pressure). tHe pressure diffence between the taps located at the full pipe section and and in the vicinity of contraction is related to the square of the velocity at section 2, fluid properties and to the abruptness of contraction. Since the velocity times the pipe area is volumetric flowrate, the basic flow equation may be written as a squre-root relation ship among measured differential pressure hw, density p and flowrate Q as
Q = Fmc [ hw /p]1/2
The meter constant Fmc adjusts for dimensional units and includes a discharge coefficient that corrects for contraction characteristics, pressure tap location, and velocity profile [Reynolds number].
Combustion Research Associates manufactures orifice plate, venture, flow limiting nozzles as per approved international standards.
Materials chosen are compatible to the medium of flow.
Features
- As per international design
- Venturi are energy saving due to pressure recovery
- Economic and cost effective
- Available with all necessary pipes and fittings, valves and FIT/flow computers
- Reasonably priced
