Installation of the protective tube for orifice plate flow meters

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The installation of the protective tube for orifice plate flowmeters is a type of piping work that involves a significant amount of work; it serves to protect cables, wires, and the metal shielding wires, while also providing protection against electromagnetic interference. Commonly used protective pipe materials include galvanized water gas pipes, galvanized welded steel pipes, and rigid polyvinyl chloride pipes, among which galvanized water gas pipes are the most widely used. 1. Common fittings used for installing protective pipes include wire threading boxes. At sleeve connections, branch points, and bends, various types of wire glands must be used to enable the protective tubes to form a piping system. The wire gland comes in a wide range of specifications, forms, and shell structures, and the orifice flow meter can meet all the requirements of protective tubes. Fittings for installing protective pipes are usually made of cast aluminum. 2. Installation of protective pipes: The pipes and fittings used for protective pipes must come with complete technical documentation, and they must meet the requirements specified in the design documents. Both the inner and outer surfaces of the protective pipes should be treated to prevent corrosion. When the steel pipe is embedded in dry concrete, its outer wall should not be painted for protection; the pipe must not be deformed or cracked. Its interior should be clean and free of burrs, while the pipe ends should be smooth with no sharp edges. The two ends of the protective tube should be fitted with wire guards or shaped like flares. The installation location of the protective tube for the orifice plate flow meter should be chosen in a place that does not affect operation, nor hinder equipment maintenance, transportation, and movement. The distance between the surface of the insulation layer on the equipment and pipes used for protection and heat retention should be greater than 200 MM, while the distance from such equipment and pipes to other devices and pipes should not exceed 150 MM