1. Before installing the orifice plate, check whether the number and size of the throttling device meet the requirements of the pipe installation position.
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Several difficult points to pay attention to when installing the orifice flowmeter http://
1. Before installing the orifice plate, check whether the number and size of the throttling device meet the requirements of the pipe installation position.
2, the new installation of the pipeline system, the pipeline must be installed after the pipeline flushing and sweeping.
3. Note that the "+" sign of the orifice plate installation direction should be toward the stream.
4. The center of the orifice plate should coincide with the centerline of the pipeline. The concentricity error should not exceed the value of 0.015 (1/β -1).
5. When installing the orifice plate in the pipeline, ensure that the end face is perpendicular to the pipe axis and the verticality error shall not exceed ±1°.
6. The gasket for clamping the orifice plate (including the ring chamber and the flange, between the ring chamber and the orifice plate) shall not protrude into the inner wall of the pipe after clamping.
7. The installation of the orifice flowmeter must be tight and no leakage is allowed. Therefore, the installation work must be carried out before the pipeline is pressure tested.
8. The pressure guiding pipe should be laid vertically or obliquely, and its inclination should not be less than 1:12. For fluids with higher viscosity, the slope should also increase. When the differential pressure signal transmission distance is greater than 3 meters, the pressure guiding tube shall be inclined in sections, and the air collector and the settler shall be installed at the highest point and the lowest point respectively.
9. In order to avoid distortion of differential pressure signal transmission, the positive and negative pressure guiding tubes should be laid as close as possible, and anti-freezing measures should be taken in severe cold areas. Electrothermal or steam insulation can be used, but to prevent the superheated vaporization of the measured medium and the generation of gas in the pressure guiding tube to cause a false differential pressure.
10. When the orifice plate is installed on the vertical main pipe, the position of the pressure tapping port can be arbitrarily selected on the plane of the pressure-receiving device. The orifice plate is installed in a horizontal or inclined main pipe, and the position of the pressure tap is shown in Figure 4.
11. The pressure guiding tube is made of materials with pressure resistance and corrosion resistance according to the nature of the medium to be tested. The inner diameter of the pressure guiding tube shall not be less than 6 mm and the length is preferably within 16 meters. Table 2 specifies the inner diameter and length of the pressure guiding tube for different media, which can be used for reference. This article is from:
Electromagnetic flowmeter http://
Orifice flowmeter http://
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