For electromagnetic flowmeters with carbon steel coated flanges, is it necessary to have a grounding ring?
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For the selection of electromagnetic flowmeters to be installed in metal-lined-free pipes, carbon steel is used for the flanges of these flowmeters. However, carbon steel flanges are usually coated. In such cases, is it necessary to use a grounding ring? Can bolting grounded carbon steel flanges with coatings achieve grounding effects?
If, when you’re tightening the bolts, the bolts manage to damage the coating during the process and come into contact with the metal, then it isn’t necessary. However, if you’re concerned, you can add a grounding wire
If you’re not sure, just answer it. . . .
In general installation guidelines for electromagnetic flow meters, it is recommended that users install a grounding ring during installation. This is because various factors during installation—such as the flange coating (as pointed out by the original poster), the gaskets used, the thickness of the bolts, and the tightness of the nuts—can all affect the electrical grounding performance of the flow meter. Therefore, installing a grounding ring serves as a precautionary measure. Additionally, following the installation instructions ensures that it’s easier to determine who’s responsible in case any problems arise (this isn’t meant as a way to shirk responsibility).
I support the opinion from the 7th floor; don’t seek convenience, as it will be very troublesome to make corrections when problems arise
Specification requirements: The flow meter housing, the fluid being measured, and the pipe connection flanges shall be equipotentially connected and grounded. Therefore, a grounding ring must be added as required by the specifications