Insufficient standard disposal method for orifice flow meter installation

Abstract: The information on the disposition method of the installation of the orifice flow meter is not standardized enough by the excellent flow meter and flow meter manufacturers to provide you with quotations. The application range of the instrument is very wide, and it is one of the common equipment in the automation control of petrochemical, environmental protection, building materials, food, electric power, metallurgy, light industry, municipal and national defense industries. The instrument personnel are mainly involved in instrument selection, installation, maintenance and Troubleshooting, etc. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the article on the installation of orifice flowmeters that are not standardized enough. The application range of the instrument is very wide, and it is one of the common equipment in the automation control of petrochemical, environmental protection, building materials, food, electric power, metallurgy, light industry, municipal and national defense industries. The instrument personnel are mainly involved in instrument selection, installation, maintenance and Troubleshooting, etc., instrument installation seems to be a relatively simple matter. In fact, if the instrument installation is not standardized, it may cause problems such as inaccurate measurement, high failure rate, and increased maintenance, and it may cause unplanned shutdown. , and even lead to safety accidents. Improper installation of the orifice flowmeter may cause the following irregularities or even errors, resulting in measurement errors. 1. The straight pipe section before and after the orifice plate does not meet the requirements: the function of the straight pipe section before and after the orifice plate is to ensure the stable flow of the fluid in the pipeline, but because there are often resistance parts such as bends, bifurcations, and confluences on the process pipeline, the fluid changes stably. for disturbance, resulting in measurement error. The elimination method is to reasonably design the installation position of the throttling device according to the requirements of the front and rear pipelines. 2. The downstream surface of the orifice plate is damaged or the flange gasket of the orifice plate protrudes into the pipeline: During the process of transporting the orifice plate or installing the orifice plate, it is easy to cause the upstream and downstream surfaces to be damaged or the flange gasket to protrude into the pipeline. , resulting in measurement errors. The elimination method is to improve the technical quality and sense of responsibility of the construction personnel. The construction personnel should carefully check the orifice plate before installing the orifice plate. If it is found that the downstream surface of the orifice plate is damaged, it should be replaced in time; during the installation of the orifice plate, the damage to the orifice plate should be avoided; when installing the flange gasket, the method should be used. The centerline of the flange gasket is the same as the centerline of the pipe. 3. Reverse installation on the upper and lower sides of the orifice plate: Before installation, the flow direction of the medium in the pipeline and the direction of the orifice plate should be correctly identified, otherwise the measured value will be low. This is due to the carelessness of the construction personnel. The elimination method is to make the orifice plate marked with the mark when installing the orifice plate.“+”The face is on the upstream side of the flow direction. 4. Different orifice plates are installed in the wrong position: This situation is generally particularly prone to occur during the commissioning stage. During the commissioning stage, each process pipeline needs to be purged several times, and the orifice plate is frequently disassembled. If the size of the orifice plate is the same, there will be errors if you are not careful, and the orifice plate can be replaced to return to normal. It can be seen that in order to maximize the function and function of the instrument, the correct selection is the primary condition, and the correct installation is the decisive factor. Precautions before installing the orifice flowmeter: 1. Before installing the meter, the process pipeline should be purged to prevent the ferromagnetic substances retained in the pipeline from adhering to the meter, affecting the performance of the meter and even damaging the meter. If unavoidable, a magnetic filter should be installed at the inlet of the meter. The instrument itself does not participate in the air sweep before production, so as not to damage the instrument. 2. Before installing the instrument to the process pipeline, check whether it is damaged or not. 3. The installation form of the instrument is divided into vertical installation and horizontal installation. If it is a vertical installation form, it should be ensured that the angle between the center vertical line and the plumb line of the instrument is less than 2°; If it is installed horizontally, the angle between the horizontal center line of the instrument and the horizontal line should be less than 2°. 4. The upstream and downstream pipes of the instrument should be the same diameter as the instrument, the connecting flange or thread should match the flange and thread of the instrument, the length of the upstream straight pipe section of the instrument should be at least 5 times the nominal diameter of the instrument, and the length of the downstream straight pipe section should be greater than Equal to 250mm. 5. Since the instrument transmits signals through magnetic coupling, in order to ensure the performance of the instrument, at least 250px around the installation, no ferromagnetic substances are allowed. 6. The instrument for measuring gas is calibrated under a specific pressure. If the gas is directly discharged to the atmosphere at the outlet of the instrument, it will cause a pressure drop at the float and cause data distortion.

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