Method of in line verification of a flow meter
A verification method, flow meter technology, applied in the field of flow meter verification in the pipeline
Active Publication Date: 2014-09-10
ENDRESSHAUSER GRP SERVICES AG
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Problems solved by technology
Smaller deviations do not present information about the measurement properties of the flowmeter to be validated, since they are within the measurement uncertainty of the validation method
Method used
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[0055] figure 1 The measurement arrangement for in-line verification of the flow meter to be verified 1 is shown, comprising the flow line 3 , the flow meter to be verified 1 and the clamp-on ultrasonic flow meter 5 .
[0056] The flowmeter 1 to be verified can be any type of flowmeter, such as a Coriolis flowmeter, a vortex flowmeter, an electromagnetic flowmeter or an ultrasonic flowmeter.
[0057] Flowline 3 is for example figure 1 Shown is a single pipe for conveying the flowing medium, or a system of interconnected pipes, lines or conduits for conveying the flowing medium, so that the same flow flows through the entire length of the flow line 3 .
[0058] For example, a clamp-on ultrasonic flowmeter 5 is a flowmeter operating according to the Doppler principle or according to the principle of travel time difference, comprising a measurement unit 7 for measuring flow-dependent quantities and electronics 9 for indicating Q vs. The measured flow indication Q is determined ...
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A method of in line verification of a flow meter (1) installed in a flow line (3) by means of one or two ultrasonic clamp on flow meters (5, 5a, 5b) to be installed in line with the flow meter (1) to be verified having a low Standard measurement uncertainty (A) inherent to the method is described, comprising a preparatory phase, during which a predetermined number (n) of simultaneously derived measured flow indications (QFL k) of the calibrated flow meter (1) and the calibrated ultrasonic flow meters (5, 5a, 5b) are recorded, and during which a virtual pipe diameter (D) is determined, which if it had been applied during the simultaneous measurements would have minimized the differences between the measured flow indications (QFL k) of the flow meter (1) and the measured flow indications (QUS k) of the ultrasonic flow meter (5) or the averages (B) of the measured flow indications (QUS1 k, QUS2 k) of the ultrasonic flow meters (5a, 5b) respectively, and comprising a verification phase, during which the ultrasonic flow meters (5, 5a, 5b) are set up to determine their measured flow indications based on the Virtual pipe diameter (D), during which simultaneously derived measured flow indications (QFL k; QUS k or QUS1 k, QUS2 k) of the flow meter (1) and the ultrasonic flow meters (5, 5a, 5b) are recorded, and during which an alert is issued in case a deviation (C) between simultaneously derived measured flow indications (QUS k, QFL k) of the flow meter (1) and the ultrasonic flow meter (5) or between measured flow indications (QFL k) of the flow meter (1) and averages (B) of the measured flow indications (QUS k, QFL k) of the ultrasonic flow meters (5a, 5b) respectively exceeds a predetermined deviation limit, which was set based on a measurement uncertainty (A) inherent to the determination of the deviation (C).
Description
technical field [0001] The invention relates to an in-line verification method of a flowmeter. The in-line verification method is determined by determining the measured flow indication of the flowmeter to be verified and one or two clip-in ultrasonic flowmeters installed the same as the flowmeter to be verified. The deviation between the measured flow indications. Background technique [0002] A flow meter is a common device used to measure the flow of a medium passing through a pipeline. In various branches of industry, such as in the chemical or pharmaceutical industries, the measured flow indication obtained by flow meters is used to control complex industrial processes. [0003] There is a wide variety of flow meters on the market, which operate according to various measuring principles, such as for example ultrasonic flow meters, Coriolis flow meters, vortex flow meters or electromagnetic flow meters. [0004] To ensure that flowmeters meet the specified measurement a...
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IPC IPC(8): G01F1/66G01F25/00
CPCG01F25/0007G01F25/00G01F25/003G01F1/66G01F1/667G01F1/662G01F25/13G01F25/10
Inventor 迪米特里·韦西埃
Owner ENDRESSHAUSER GRP SERVICES AG