Installation technical essentials of large-diameter electromagnetic flow meter

Abstract: The technical essentials of the installation of large-diameter electromagnetic flowmeters are provided by excellent flowmeter and flowmeter manufacturers. The normal use of the large-diameter electromagnetic flowmeter must first ensure the correct installation. In the field installation process of large-diameter electromagnetic flowmeter, in order not to affect the detection accuracy of the metering system, the following process requirements must be strictly met. 1. Keep the electrode axis horizontal. . For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following are the details of the installation technical essentials of large-diameter electromagnetic flowmeters. The normal use of the large-diameter electromagnetic flowmeter must first ensure the correct installation. In the field installation process of large-diameter electromagnetic flowmeter, in order not to affect the detection accuracy of the metering system, the following process requirements must be strictly met. 1. Keep the electrode axis horizontal. When the electromagnetic flowmeter sensor is installed, the axes of the two electrodes must be in the horizontal direction. 2. The measured medium is filled with the measuring tube. The measuring tube should be filled with water, and there should be no partial-full tube or bubbles gathering in the measuring tube. 3. Meet the flow direction and straight pipe section requirements. The direction indicated by the arrow on the sensor is the positive direction of the medium flow; the super-large diameter electromagnetic flowmeter (separate installation of the sensor and the converter) is designed to be installed in the flowmeter well of the pipeline. In order to ensure accurate measurement, the requirements of the front 10D/rear 2D straight pipe section of the flowmeter must be guaranteed (D is the nominal diameter). 2. The process quality of the installation process of the large-diameter electromagnetic flowmeter 1. Assembly of the sensor and the expansion joint Install the grounding ring and the expansion joint on the downstream side of the flowmeter according to the arrow on the sensor, and pre-adjust the expansion joint to the shortest state. 2. Flowmeter well fracture The flowmeter well fracture steps are as follows: (1) Confirm the fracture position of the installation sensor, and accurately measure the size of the broken pipe (according to the size after the expansion joint is stretched). (2) Open the skylight in the fracture area of ​​the pipeline, and enter the pipe to make the m-shaped steel support to ensure the roundness of the pipeline and prevent the deformation of the pipe end after the fracture and affect the flange installation. (3) After the fracture, mechanically treat the groove at the pipe ends on both sides to meet the requirements of welding flanges. 3. The sensor plus expansion joint after hoisting and assembly, with a total weight of about 6t, is hoisted in place by a 25t truck crane on site. After the hoisting is in place, adjust and release the expansion joint, install a grounding ring and a gasket between the upstream flange and the sensor, and insert the bolts to align and tighten; also install a gasket between the downstream flange and the expansion joint. Insert the bolts and tighten. 4. Flange welding Adjust the position of the upstream and downstream flanges, grounding rings and gaskets of the pipeline, tighten the bolts, and fix them by spot welding. Remove the pre-tightening bolts of the upstream and downstream flanges, and adjust the expansion joints so that the upstream and downstream flanges are separated from the flowmeter and expansion joints, leaving a welding space inside the flanges. The inner and outer flanges are welded with two flanges upstream and downstream by fillet welding. 5. Non-destructive testing and anti-corrosion treatment of welded joints (1) Testing standards and qualified grades All flange interface fillet welds need to undergo non-destructive testing, using electromagnetic flaw detection, and the inspection ratio is 100%. The quality should meet the secondary requirements of the standard JB4730-2005. If it is found that the welding seam of the pipeline flange has excessive defects, it should be dealt with in time, and finally the re-inspection will be qualified. Any weld can only be repaired once. (2) The internal and external anti-corrosion of the steel pipe fittings of the inner anti-corrosion flange weld and the outer flange is treated in the same way as the steel pipe body. The external anti-corrosion of the flange weld is painted with modified chlorosulfonated polyethylene anti-corrosion coating; Water grade non-toxic epoxy coating. The inner sides are all coated with two bottoms and two sides. 6. The overall fastening and positioning of the sensor expansion joint After the upstream and downstream flange welds pass the flaw detection, they enter the overall fastening and positioning process of the sensor expansion joint. (1) Adjust the release expansion joint, install the grounding ring and the gasket between the upstream flange and the sensor, insert the bolt and fasten it. (2) Install a gasket between the downstream flange and the expansion joint, penetrate the bolts and tighten. (3) In a symmetrical manner, tighten all flange bolts and install the positioning sensor and expansion joint. 7. System water pressure test After the sensor and the expansion joint are installed as a whole, the water pressure test should be carried out together with the water pipeline. The test pressure is 1.5 times the working pressure. After passing the hydraulic test, it can be put into operation. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Technical Essentials of Installation of Large Diameter Electromagnetic Flow Meter'
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