Scheduling and Operation of Elbow Pipe Flow Meter System

Abstract: The scheduling and commissioning information of the elbow flow meter system is provided by the excellent flow meter and flow meter manufacturers and quotation manufacturers. Installation requirements of the elbow sensor The elbow sensor is installed at the 90-degree turn of the measuring pipe by welding. ,overall. More flowmeter manufacturers select models and price quotations. You are welcome to inquire. The following is the details of the dispatching and commissioning of the elbow flowmeter system.• Installation requirements of the elbow sensor The elbow sensor is installed at the 90-degree turn of the measuring pipe by welding. , in general, there are the following four installation states to choose from: ●Horizontal to horizontal; ●Positive pressure measurement is installed vertically at the top; ●Positive pressure measurement is installed vertically at the bottom; ●Any space state. The above four states can be used in principle when the elbow sensor is installed, but for some measured media, choosing the appropriate installation state can not only greatly simplify the installation and debugging work, but also greatly improve the measurement accuracy of the system. Therefore, how to correctly select the installation state of the elbow sensor is very important. It is embodied in the following principles and methods:• For the elbow sensor that measures general liquid media, it can be installed in any state, because the liquid in the tube and the liquid in the pressure guiding tube are almost under the same working conditions, no matter whether the two pressure induction ports of the elbow sensor are in the same condition. Regardless of the relative position (referring to the upper and lower relationship), the differential pressure transmitter does not need to be migrated and compensated, so the installation orientation of the elbow sensor has nothing to do with the measurement accuracy of the system.• For systems that measure hot water or cold water (meaning that the temperature of the liquid in the pipeline is quite different from the ambient temperature), if the elbow sensor is not installed in a horizontal-to-horizontal installation state, then the gap between the two pressure-inducing ports of the elbow sensor There must be a height difference H value. Since the liquid in the main pipeline and the liquid in the pressure guiding pipe are under different temperature conditions, the density is different. In order to improve the measurement accuracy of the system, it is necessary to make The deviation value of the differential pressure transmitter is migrated and compensated. Its migration can be calculated by the following formula: Δ P = H (ρ 1 -ρ 2)*g Among them: ΔP---the migration amount of the differential pressure transmitter; H---the height difference between the two pressure taking ports;ρ 1 --- The density of the liquid in the pressure guiding tube;ρ 2 --- Liquid density in the pipeline; g --- Gravitational acceleration The specific use of positive migration or negative migration depends on the installation orientation of the pipeline and whether it is hot or cold water in the pipeline. The computer automatic migration compensation technology is used in the elbow flowmeter to calculate the difference in fluid density between the pressure guiding pipe and the main pipeline in real time according to the fixed height difference H value and the measured temperature value, and directly eliminate the difference from the differential pressure value measured by the differential pressure transmitter. pressure error.• For the installation of elbow sensors that measure steam or other condensable gases, the main point of installation here is that these media will condense into liquids at room temperature, resulting in the final accumulation of liquid in the pressure guiding pipes. Therefore, when the elbow sensor is not installed horizontally to horizontal, it is necessary to perform migration compensation for the height difference of the liquid column in the pressure induction pipe caused by the height difference of the two pressure induction ports. The accuracy of this migration compensation is one of the most important conditions to guarantee the accuracy of the measurement system. Since the density of the medium in the process pipeline is very small (because they are in the state of steam and gas), while the density of the medium in the pressure guiding pipe is very large (they are in the liquid state), the density of the two media is very different, so the differential pressure transmission The migration amount of the transmitter is relatively large, and the elbow sensor is a low differential pressure sensor, and the differential pressure value it can generate within the normal working range is relatively small, so how to ensure the differential pressure transmitter The transfer accuracy is very important.• In order to avoid the occurrence of additional measurement errors due to improper migration as much as possible, the following technical measures are recommended when measuring these media. A disc condenser is always installed at the pressure-inducing port of the elbow sensor to ensure the stability of the condensate level in the pressure-inducing pipe;• As long as the site conditions permit, the elbow sensor and sensor are preferably installed horizontally to horizontal, so that the two pressure-inducing ports of the elbow sensor are on the same level, which fundamentally eliminates the need for compensation and migration of the differential pressure transmitter. Trouble; • Since the two pressure inlets of the elbow sensor are located on both sides of the elbow, it is not easy to accurately ensure that the two disc condensers and the pressure inlets are on the same level. Here we provide a simple measurement method for users. Refer to when installing (as shown in Figure 5).

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