Installation and Operation of Differential Pressure Flow Meter

Abstract: The installation and commissioning information of differential pressure flow meter is provided by excellent flow meter and flow meter manufacturers. In order to ensure the installation and measurement accuracy of differential pressure flowmeters (mainly: orifice flowmeters, V-cone flowmeters, uniform velocity tube flowmeters such as Annubar flowmeters, Verabar flowmeters, Deltaba flowmeters, etc.), Reduce the measurement error, except that it must be carried out according to the specified requirements. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the details of the installation and commissioning of differential pressure flowmeters. In order to ensure the installation and measurement accuracy of differential pressure flowmeters (mainly: orifice flowmeters, V-cone flowmeters, uniform velocity tube flowmeters such as Annubar flowmeters, Verabar flowmeters, Deltaba flowmeters, etc.), To reduce the measurement error, in addition to the design calculation, processing and manufacturing and instrument selection according to the specified requirements, the correct installation and use must also be carried out. The technical staff of the flowmeter manufacturer Xudong Instrument Factory will briefly summarize the following for you: 1. The installation of the throttling device adopts the throttling method to measure the flow, and the measured medium is required to maintain a stable flow state before and after the throttling device. For this reason, it is necessary to keep enough straight pipe sections before and after the throttling device. It is not allowed to install temperature measuring elements or open sampling ports near the throttling device, nor are there any resistance parts such as elbows, bifurcations, confluences, gates, etc.; throttling parts The installation direction should be such that the exposed part of the throttling part is marked with“ten”The side of the throttling device should be placed against the flow direction; the opening of the throttling piece should be concentric with the axis of the pipeline, and the end face of the throttling device should be perpendicular to the axis of the pipeline; in the pipeline where the throttling device is located, the fluid must be filled with the pipeline and be single-phase It is absolutely forbidden to allow impurities to enter the pipeline to block the orifice during installation. 2. The installation of the pressure guide pipe The pressure guide pipe should be laid according to the shortest route, and the length should preferably be within 16m. The inner diameter of the pressure guiding tube should be comprehensively considered according to the properties of the measured fluid and the length of the pressure guiding tube, generally between 6 and 25mm. The two pressure guiding tubes should be as close as possible to make them under the same strength, so as to avoid measurement errors caused by density changes caused by different temperatures. The pressure guiding pipe shall be laid vertically or inclined, and its inclination shall not be less than 1:2. The pressure-taking port is generally set on the flange, ring chamber or clamping ring used to fix the throttling piece, and its opening direction should ensure that the measured fluid is liquid to prevent gas from entering the pressure guiding pipe, and when the measured fluid is gas to prevent water from entering. and booty into the catheter. When measuring steam, a condenser should be installed in the pressure guiding pipe to condense the measured steam, and make the condensate level in the positive and negative pressure guiding pipes have the same height and keep it constant. When the fluid to be measured is corrosive, contains solids that are easy to freeze, easy to precipitate or has a high viscosity, an isolator and isolation fluid should be used to prevent the measured medium from directly contacting the differential pressure flowmeter or differential pressure transmitter and damaging it. performance of the instrument. The spacer fluid should be rotated to a liquid with a high boiling point, a low freezing point, and stable physical and chemical properties. 3. Installation of the flowmeter The installation of the flowmeter must first ensure that there is no obvious difference between the environmental conditions of the on-site installation and the requirements specified in the design of the differential pressure flowmeter. The specific installation location should be determined according to the site conditions, and should be as close as possible to the pressure-taking port to improve the response speed and enable the measured medium to fill the pressure-inducing pipeline. In order to ensure the safety of the differential pressure flowmeter, the three-valve kit should be installed before the pressure guiding pipe and the differential pressure flowmeter are connected, which can not only prevent the differential pressure instrument from being over-pressured instantaneously, but also help to connect the pressure guiding pipe when necessary. The road and the process main circuit are completely cut off. (1) When measuring the liquid flow, the pressure taking hole should be located in the lower half of the pipeline, generally 45 degrees from the horizontal line in the center of the pipeline.°The installation position of the differential pressure flowmeter should be selected below the throttling device. If the differential pressure flowmeter has to be installed above the throttling device due to site conditions, it is best for the pressure guiding pipe to go down vertically after being led out of the throttling device, and then bend upward to form a U-shaped liquid seal. And install the air collector at the highest point of the pressure guiding pipe. (2) When measuring the steam flow, the pressure-taking hole should be located in the upper half of the pipeline, and a condenser should be installed on the connecting pipeline near the throttling device, and the two condensers should be located on the same level. This can not only prevent the measurement error caused by the difference and change of the condensate height in the two pressure guiding pipes, but also prevent the high temperature steam from directly contacting the differential pressure flowmeter. (3) When measuring the gas flow, the pressure-taking hole should be located in the upper half of the pipeline, generally 45 degrees from the vertical centerline of the pipeline.°Angle, the direction is upward; the differential pressure flowmeter should be installed above the throttling device to prevent the water mixed in the gas from entering the pressure guiding pipe. If the differential pressure flowmeter has to be installed below the throttling device due to conditions, a settler must be installed at the lowest part of the pressure guiding pipeline to discharge condensate and impurities. 4. Operation of the flowmeter The differential pressure flowmeter can be put into operation after it has been installed on site and passed the inspection and calibration.

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