throttle device

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Your question isn’t very clear. As for the installation of the throttling device: when the throttling device is installed on an inclined or horizontal pipeline, the location of the sampling port must comply with the following rules: when measuring gas flow rate, it should be located in the upper half of the pipeline； When measuring liquid flow rate, in the upper half of the pipeline, within an angle range of 0–45° relative to the horizontal centerline of the pipeline ； When measuring steam flow, it is taken in the upper half of the pipeline, as well as in the lower half within an angle range of 0–45° from the horizontal centerline of the pipeline. Installation of throttling devices: 1. Throttling devices include various types of orifice plates, nozzles, Venturi tubes, etc. The pipeline conditions and technical requirements for its installation shall comply with the provisions of the current **standards (GB2624-81) and the standards set by the Metrology Bureau (JJB267-81). The throttling element must be installed after the pipeline is flushed and cleaned. 2. Before installing the throttling device, inspections should be carried out on its appearance and bore diameter, etc. The orifice plate, the inlet edge of the nozzle, and its inner walls must be smooth, free of burrs, scratches, or any visible damage. The sharp edges of the orifice plate and the curved surfaces of the nozzle should face the flow direction of the medium, and the straight pipe section ahead should meet the design requirements or construction specifications. Check that the material, thickness, and inner diameter of the gaskets used meet the design requirements. 3. Before installing the throttling element, it is necessary to check the roundness of the pipe over a length equal to 2 times the pipe diameter in the straight sections before and after it. The measured roundness in the upstream straight section shall not exceed ±0.3% of its arithmetic average, while that in the downstream straight section shall not exceed ±2% of its arithmetic average. The roundness and straightness of pipes longer than 2 times the pipe diameter are inspected visually. 4. The installation of the throttling element in the pipeline should be carried out in coordination with the process pipeline; its front surface must be perpendicular to the pipeline axis, with a deviation of no more than ±1°. The opening of the throttle element should be coaxial with the pipe, and the axial deviation shall not exceed 0.025d/(0.1+2.3β4), where β=dk/d, dk is the diameter of the orifice, and d is the inner diameter of the pipe. 5. The inner diameter of the throttle element gasket should not be smaller than the inner diameter of the pipe. The gasket of the throttling element should be clamped such that it does not press tightly against the inner wall of the pipeline. 6. When a throttling element is installed in a vertical pipe to measure liquid flow, the flow direction of the liquid must be from bottom to top.

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