![]() ![]() ![]() The suspended matter may build up at the inlet side of the horizontally installed pope unless eccentric or segmental types of orifices are used with the hole flush with the bottom of the pipe.Sharp edges will not foul with scale or other suspended matter.Do not wire draw or wear in service during the test period.Well-established coefficient of discharge.Primary Element Advantages and Disadvanges In operation, the rotating blades generate a frequency signal proportional to the liquid flow rate, which is sensed by the magnetic pickup and transferred to a read-out indicator. The turbine flowmeter consists of a multiple-bladed, free-spinning, permeable metal rotor housed in a non-magnetic stainless steel body. The rotation of the crankshaft acts as the primary flow element in these types of flowmeters. Diaphragm/Bellows meters and other positive displacement meters: e quipped with a crankshaft that rotates as fluid flows through the meter.The rotation of the turbine caused by fluid motion is detected by the magnetic pickup, serving as the primary flow element for a turbine meter. Turbine meter: e quipped with a magnetic pickup that senses the proximity of the turbine blades.Orifice flow meter: t he primary flow element in an orifice flow meter is the differential pressure across the orifice plate.May also receive additional signals for pressure and/or temperature to enable density compensation calculations to be made. I.e., differential pressure cell that translates any signals into a usable form.Īn electronic processor that can receive, process, and display the information. I.e., orifice plate, located in the steam flow. On the side of the pipe for liquid or steam.On top of the pipe for gas applications.Scale, condensation, or other contaminants must not obstruct the taps. Do not install it at the bottom of a pipe. Taps for pressure sensing for a flowmeter. Somes flow can be measured from differential pressure without having to have a differential pressure sensing element installed.įor example gas flow measurement across an economizer or air preheater, where the equipment itself produces a pressure drop that can be utilized to calculate flow rates. May be a considerable distance away in a centralized control room or remote building. The output signals are directed electrically to the indication instruments and process control devices. It is crucial to avoid placing the metering element near any bends or curves in the piping to ensure accurate measurements. This guarantees that the fluid flow experiences minimal turbulence before being measured. The usage and placement of flow-measuring devices require a minimum length of straight piping both upstream and downstream of the measurement point. Instrument Devices – Flow Measurement Use and Placement of Flow Measuring Devices ![]()
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