Image of Orifice Flow Meter | Instrument Introduction of Orifice Flow Meter

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1. How to determine the position of the pressure tap for an orifice flowmeter

The method for determining the position of the pressure tap for an orifice flowmeter is as follows: When measuring gas flow, the pressure tap should be located in the upper half of the pipeline. This is because the gas density is relatively low, making it easy to flow in the upper half of the pipeline. Setting the pressure tap here can ensure that the measured gas pressure is more representative. When measuring liquid flow rate: the pressure tap should be located within the range of 0-45 ° between the lower half of the pipeline and the horizontal centerline of the pipeline. This setting can prevent impurities or sediments in the liquid from blocking the pressure tap, while ensuring that the measured liquid pressure accurately reflects the actual flow situation in the pipeline. When measuring steam flow rate: the pressure tap should be located within the range of 0-45 ° angle between the upper half of the pipeline and the horizontal centerline of the pipeline. Steam has flow characteristics similar to gases, while considering the possibility of moisture or impurities in steam. This setup ensures that the measured steam pressure is both accurate and stable. In addition, when installing an orifice flowmeter, the following points should be noted: the specific selection of the pressure tap position: the gas pressure tap should be located at the upper part of the pipeline to ensure that the measured pressure is the true pressure of the gas in the pipeline. The liquid pressure tapping port should be avoided from being located directly below the pipeline to prevent sedimentation front particles from blocking the pressure tapping port. Usuall

y, the pressure tap can be set below the side but not directly below. The steam pressure tap can be set on the side of the pipeline, but it is also necessary to consider the influence of moisture or impurities that may be contained in the steam on the measurement. Orifice plate direction: The direction of the orifice plate must be installed correctly, with "+" indicating positive and "-" indicating negative. Among them, "+" represents the direction facing the fluid, which is the key to ensuring measurement accuracy. Pressure tube: The pressure tube led out from the positive and negative pressure ports must be kept parallel in any situation to ensure that the measured differential pressure value accurately reflects the flow of fluid in the pipeline. Connection of differential pressure transmitter: When connecting the pressure pipe to the differential pressure transmitter, be careful not to install the positive and negative pressures in reverse. Usually, "H" represents positive pressure and "L" represents negative pressure. The correct connection ensures that the differential pressure transmitter accurately measures and outputs the flow rate of fluid in the pipeline. Location of differential pressure device: When measuring gas, it is recommended to place the differential pressure device above the pipeline; When measuring liquids, the differential pressure device should be placed at the bottom of the pipeline. For measuring steam, if equipped with a condenser, the condenser should be kept at the same level to ensure measurement accuracy. In summary, the method of determining the pressure tap position of an orifice flowmeter needs to be comprehensively considered based on the properties of the measured fluid (gas, liquid, or

Image of Orifice Flow Meter | Instrument Introduction of Orifice Flow Meter

1. How to determine the position of the pressure tap for an orifice flowmeter

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