flow measurement


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flow measurement

[′flō ‚mezh·ər·mənt]
(engineering)
The determination of the quantity of a fluid, either a liquid, a vapor, or a gas, that passes through a pipe, duct, or open channel.

Flow measurement

The determination of the quantity of a fluid, either a liquid, vapor, or gas, that passes through a pipe, duct, or open channel. Flow may be expressed as a rate of volumetric flow (such as liters per second, gallons per minute, cubic meters per second, cubic feet per minute), mass rate of flow (such as kilograms per second, pounds per hour), or in terms of a total volume or mass flow (integrated rate of flow for a given period of time).

Flow measurement, though centuries old, has become a science in the industrial age. This is because of the need for controlled process flows, stricter accounting methods, and more efficient operations, and because of the realization that most heating, cooling, and materials transport in the process industries is in the form of fluids, the flow rates of which are simple and convenient to control with valve or variable speed pumps. See Process control

Measurement is accomplished by a variety of means, depending upon the quantities, flow rates, and types of fluids involved. Many industrial process flow measurements consist of a combination of two devices: a primary device that is placed in intimate contact with the fluid and generates a signal, and a secondary device that translates this signal into a motion or a secondary signal for indicating, recording, controlling, or totalizing the flow. Other devices indicate or totalize the flow directly through the interaction of the flowing fluid and the measuring device that is placed directly or indirectly in contact with the fluid stream.

References in periodicals archive ?
This device was then compared with an air flow measurement device which was designed according to ANSI/ASHRAE 51-1999.
It is also unaffected by vibration in the plant, magnetic and electrical effects as well as the conductivity of the liquid - none of these factors have any effect on the accuracy or reliability of the flow measurements. The SAW technology also has the ability to distinguish between laminar and turbulent flows.
By identifying high-outflow fistulas with access blood flow measurements, clinicians can make referrals to the vascular surgical team for early interventions, such as banding or fistula ligation in severe cases.
However, as holders of the UK National Standard for flow measurement NEL can offer advice and technical expertise in this area.
Browse Blood Flow Measurement Devices Market - Global Blood Flow Meter Products and Applications Analysis and Forecast 2013-2020 at http://www.ihealthcareanalyst.com/report/blood-flow-measurement-devices-market/
Metering consultancy, flow measurement services, meter prover calibrations, tank calibration, 3D laser scanning and cargo inspection are some of the related solutions Intertek specialises in delivering to oil and gas clients.
In this occurrence, if there is any abnormal condition with a contingency such as loss of single PMU then the situation is handled by the usage of conventional flow measurement units.
With no moving parts and no warm-up time requirement, they are indispensable for field technicians who require fast and durable flow measurement. The mass flow meters feature tast 5-msec meter speeds and live readouts of mass and volumetric flow rates, pressure and temperature.
The Polaris transmitter is the first liquid flow meter offered by Magnetrol, expanding the already diverse level and flow measurement portfolio that has been established over the last 80 years.
The release now supports Liquid Electronic Flow Measurement data for several drivers, improves performance with the Allen-Bradley ControlLogix Ethernet Driver and usability with the Siemens TCP/IP Ethernet Driver, and upgrades the DataLogger Plug-In guaranteeing delivery of valuable process data to a SQL server.
Multiphase flow measurement systems in subsea applications have uncertainties of flowrate that lead to financial exposures of billions of dollars a year.
The CentriFeeder[TM] with Integrated Control Valve (ICV) is both a controlled feed device and a mass flow measurement device in a single multi-functioning unit that measures and controls the flow of any dry, free-flowing solid.