Small Flow of Lzd Metal Tube Rotameter in Quantity

In order to facilitate maintenance and replacement of flowmeter and cleaning of measuring pipeline, metal tube rotameter installed on process pipeline shall be equipped with bypass pipeline and bypass valve. The metal rotameter consists of two parts, one of which is a conical tube gradually expanding from bottom to top; The other part of the rotameter is a rotor which is placed in a conical tube and can move freely along the centerline of the tube. When the rotameter measures the fluid flow, the measured fluid flows in from the lower end of the conical tube, and the fluid flow impacts the rotor, And exert a force on it (the magnitude of this force varies with the flow); 1. When the metal tube float flowmeter is used, the valve shall be opened and closed slowly to avoid instrument damage. If the flowmeter is opened, because there is no pressure in the pipeline or the system has not reached the working pressure for normal use of the instrument, the control valve must be opened slowly until the system is normal, and the instrument can be used, otherwise it is easy to cause pointer jump The phenomenon that the float or float is damaged by sudden impact. When the flow is large enough, the generated force lifts the rotor and raises it. At the same time, the measured fluid flows through the annular section between the rotor and the conical pipe wall and flows out from the upper end. 6. In order to avoid the deformation of the flowmeter caused by the pipeline, the flange of the process pipeline must be coaxial and parallel with the flange of the flowmeter. The pipeline shall be supported to avoid pipeline vibration and reduce the axial load of the flowmeter. The control valve in the measurement system shall be installed downstream of the flowmeter. The force on the rotor when the measured fluid flows, Exactly equal to the weight of the rotor in the fluid (called display weight), the force on the rotor is in balance and stays at a certain height. The analysis shows that the position height of the rotor in the conical tube corresponds to the flow through. Therefore, the corresponding flow value can be obtained by observing the position height of the rotor in the conical tube. The pulsation of the flow itself, such as a reciprocating pump or a reciprocating pump upstream of the proposed instrument position If there is a large load change at the downstream of the regulating valve, the measuring position shall be changed or the pipeline system shall be remedied and improved, such as adding a buffer tank; If the instrument oscillates, such as the gas pressure is too low during measurement, the upstream valve of the instrument is not fully opened, and the regulating valve is not installed downstream of the instrument, targeted improvement shall be made to overcome it, or the instrument with damping device shall be selected.