Multi-hole balanced flow meter and its design method

Abstract

This invention provides a multi-orifice balanced flow meter and its design method. The multi-orifice balanced flow meter includes a medium pipeline assembly comprising a first orifice flange and a second orifice flange connected to each other, with a throttling element between the first and second orifice flanges; a pressure tapping assembly including a heat exchange block with a heat exchange chamber for heating the medium; and an angle of the pressure tapping assembly set to 45°~135° along the circumference of the throttling element; and a transmitter disposed at the output end of the pressure tapping assembly. This invention solves the problem of transmitter damage caused by direct contact between the transmitter and the medium during low-temperature fluid measurement by using a heat exchange block in the pressure tapping assembly to heat the medium. Simultaneously, by accurately calculating the heat transfer coefficient and target length, it ensures stable medium temperature and improves measurement accuracy.

Description

Technical Field

[0001] This invention relates to the field of flow meter technology, and in particular to a multi-hole balanced flow meter and its design method. Background Technology

[0002] A multi-orifice balanced flow meter is a flow meter that measures flow based on the differential pressure principle. The flow sensor structure combines an orifice plate with a rectifier; several orifices are drilled on a plate according to certain calculations and functional relationships. Flow is measured by measuring the differential pressure across the plate. Multi-orifice balanced flow meters, used in conjunction with differential pressure transmitters and display instruments, can measure, display, and accumulate flow. Due to its unique structure, the multi-orifice balanced flow meter is particularly suitable for measuring flow in short straight pipe sections, with dirty media, and low flow rates. Multi-orifice balanced flow meters are widely used in flow measurement in industries such as chemical, textile, light industry, and heating.

[0003] However, when existing multi-orifice plate flow meters are used to measure cryogenic fluids, due to the special characteristics of cryogenic fluids, the cryogenic fluids are far beyond the lowest temperature that differential pressure transmitters can withstand (-40°C). Direct contact between the cryogenic medium and the transmitter diaphragm can damage the transmitter, thus causing measurement failure. Summary of the Invention

[0004] This invention provides a multi-hole balanced flow meter and its design method to solve the technical problem of damage to differential pressure transmitters when measuring low-temperature media.

[0005] This invention provides a porous balanced flow meter, the porous balanced flow meter comprising: A medium piping assembly, the medium piping assembly including a first orifice flange and a second orifice flange connected to each other, and a throttling element is provided between the first orifice flange and the second orifice flange; A pressure tapping assembly is provided on the first orifice plate flange and the second orifice plate flange respectively, and the pressure tapping assembly is in internal communication with the first orifice plate flange and the second orifice plate flange. The pressure tapping assembly includes a heat exchange block, and the heat exchange block is provided with a heat exchange cavity for heating the medium. Along the circumference of the throttling element, the angle of the pressure tapping assembly is set to 45°~135°. A transmitter is disposed at the output end of the pressure tap assembly.

[0006] In one embodiment of the present invention, the pressure tapping tube assembly includes a first pressure tapping tube, a shut-off valve, a second pressure tapping tube, a third pressure tapping tube, and a three-valve group connected sequentially from bottom to top. The heat exchange block is disposed between the second pressure tapping tube and the third pressure tapping tube, and the transmitter is connected to the three-valve group.

[0007] In one embodiment of the present invention, the heat exchange block includes a first end cover, a second end cover, and a housing. The first end cover and the second end cover are respectively disposed at both ends of the housing, and the first end cover, the second end cover, and the housing form the heat exchange cavity.

[0008] In one embodiment of the present invention, the first end cap is provided with a first mounting hole and an input hole, the first mounting hole and the input hole are continuously arranged, the diameter of the first mounting hole is larger than the diameter of the input hole, the first mounting hole is used to connect with the second pressure pipe, and the input hole is in communication with the heat exchange cavity.

[0009] In one embodiment of the present invention, the second end cap is provided with a second mounting hole and an output hole, the second mounting hole and the output hole are continuously arranged, the diameter of the second mounting hole is larger than the diameter of the output hole, the second mounting hole is connected to the third pressure pipe, and the output hole is connected to the heat exchange chamber.

[0010] In one embodiment of the present invention, the diameter of the input hole is larger than the diameter of the output hole.

[0011] In one embodiment of the present invention, the inner diameter of the heat exchange cavity is larger than the inner diameter of the second pressure tap.

[0012] In one embodiment of the present invention, a plurality of connecting bolts for interconnection are provided between the first orifice flange and the second orifice flange, and the plurality of connecting bolts are arranged in the circumferential direction of the first orifice flange and the second orifice flange.

[0013] In one embodiment of the present invention, a first sealing gasket is provided between the first orifice flange and the throttling element, and a second sealing gasket is provided between the second orifice flange and the throttling element.

[0014] The present invention also provides a design method for a multi-hole balanced flow meter, the design method comprising: Use 3D software to create a model of the sampling tube assembly; The material, medium type, target temperature and ambient temperature of the pressure tapping tube assembly are set. A first heat transfer coefficient is determined based on the material and medium type of the pressure tapping tube assembly, and a second heat transfer coefficient is determined based on the material and ambient temperature of the pressure tapping tube assembly. The third heat transfer coefficient is determined based on the first and second heat transfer coefficients when the medium flows in the pressure tap assembly. Based on the third heat transfer coefficient, the medium type, and the target temperature, determine the target length required for the medium in the pressure tap assembly to be heated to the target temperature; The installation location of the differential pressure transmitter is determined based on the target length.

[0015] The beneficial effects of the present invention are as follows: The present invention proposes a multi-hole balanced flow meter and design method, which heats the medium by setting a heat exchange block in the pressure tapping tube assembly, thus solving the problem that the transmitter is easily damaged by direct contact between the transmitter and the medium during low temperature fluid measurement. At the same time, by accurately calculating the heat transfer coefficient and the target length, the medium temperature is ensured to be stable, thereby improving the measurement accuracy. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0017] In the attached diagram: Fig. 1 This is an overall schematic diagram provided for an embodiment of the present invention; Fig. 2 This is a schematic diagram of a heat exchange block provided in one embodiment of the present invention; Fig. 3 This is a schematic diagram of a process provided in one embodiment of the present invention.

[0018] The attached figures are labeled as follows: 1. First orifice flange; 2. Second orifice flange; 3. Connecting bolt; 4. Throttling element; 5. First sealing gasket; 6. Second sealing gasket; 7. First pressure tap; 8. Shut-off valve; 9. Second pressure tap; 10. Heat exchange block; 10. Housing; 101. First end cover; 102. First mounting hole; 1021. Inlet hole; 1022. Second end cover; 103. Second mounting hole; 1031. Outlet hole; 1032. Heat exchange chamber; 104. Third pressure tap; 11. Three-valve manifold; 12. Transmitter; 13. Detailed Implementation

[0019] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0020] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0021] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the invention. However, it will be apparent to those skilled in the art that embodiments of the invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the invention.

[0022] like Figs. 1-3 As shown, the present invention provides a multi-hole balanced flow meter and its design method.

[0023] In an exemplary embodiment, the multi-orifice balanced flow meter includes a medium pipeline assembly, a pressure tapping assembly, and a transmitter 13. The medium pipeline assembly includes a first orifice flange 1 and a second orifice flange 2 connected to each other, with a throttling element 4 between the first orifice flange 1 and the second orifice flange 2. The pressure tapping assembly is respectively disposed on the first orifice flange 1 and the second orifice flange 2, and communicates internally with the first orifice flange 1 and the second orifice flange 2. The pressure tapping assembly includes a heat exchange block 10, which has a heat exchange chamber 104 for heating the medium. The angle of the pressure tapping assembly is set to 45°~135° along the circumference of the throttling element 4. A transmitter 13 is also provided, wherein the transmitter 13 is disposed at the output end of the two pressure tapping assemblies, and is used to detect the pressure difference between the first orifice flange 1 and the second orifice flange 2.

[0024] In this embodiment, the medium in the first orifice flange 1 or the second orifice flange 2 can be sampled through the pressure tapping pipe. Overall heat exchange and heating occur within the pressure tapping pipe assembly. The heat exchange block 10 improves heat exchange efficiency, ensuring the cryogenic medium is heated to a safe temperature before reaching the transmitter 13, thus preventing damage to the transmitter 13 due to direct contact with the cryogenic medium. Specifically, the medium pipeline assembly forms a fluid channel through the first orifice flange 1 and the second orifice flange 2, and the throttling element 4 generates a differential pressure signal. In this embodiment, the angle of the pressure tapping pipe assembly is optimized to prevent direct contact between the cryogenic medium and the transmitter 13. The transmitter 13 measures the flow rate by processing the heated medium signal.

[0025] In a specific embodiment, the angle of the pressure tapping tube assembly is set to 90°, and it is in a vertical position.

[0026] It is worth noting that in this embodiment, when the medium flows, it flows from the first orifice flange 1 through the throttling element 4 into the second orifice flange 2.

[0027] It should also be noted that in this embodiment, since the low-temperature liquid medium will vaporize after heating, the vaporized gaseous medium will come into contact with the sensor diaphragm of the transmitter 13 for measurement. Therefore, when setting the pressure tap assembly, the angle should be avoided to avoid being too horizontal, so as to prevent the low-temperature liquid medium from directly contacting the sensor diaphragm of the transmitter 13 and causing damage to the transmitter 13.

[0028] In an exemplary embodiment, the pressure tapping assembly includes a first pressure tapping pipe 7, a shut-off valve 8, a second pressure tapping pipe 9, a third pressure tapping pipe 11, and a three-valve assembly 12 connected sequentially from bottom to top. A heat exchange block 10 is disposed between the second pressure tapping pipe 9 and the third pressure tapping pipe 11, and a transmitter 13 is connected to the three-valve assembly 12.

[0029] In this embodiment, the first pressure tap 7 is used to connect the orifice flange and the shut-off valve 8, the second pressure tap 9 is used to connect the shut-off valve 8 and the heat exchange block 10, and the third pressure tap 11 is used to connect the heat exchange block 10 and the transmitter 13.

[0030] For example, in this embodiment, the first pressure tube 7, the second pressure tube 9, the third pressure tube 11, and the heat exchange block 10 are all made of 304L stainless steel, which has good corrosion resistance and can resist corrosion from various chemical media such as acids, alkalis, and salts. At the same time, 304L stainless steel has good thermal conductivity, which allows the medium in the first pressure tube 7, the second pressure tube 9, the third pressure tube 11, and the heat exchange block 10 to exchange heat with the ambient temperature at all times, so that the low-temperature medium can be heated up quickly.

[0031] For example, in this embodiment, the lower end of the first pressure tap 7 is fixedly connected to the orifice plate flange by welding, and the upper end is connected to the input end of the shut-off valve 8. The lower end of the second pressure tap 9 is connected to the output end of the shut-off valve 8. The upper end of the second pressure tap 9 is welded to the heat exchange block 10. The upper end of the heat exchange block 10 is welded to the lower end of the third pressure tap 11. The upper end of the third pressure tap 11 is connected to the three-valve group 12. The three-valve group 12 guides the heated medium to the transmitter 13 for pressure measurement.

[0032] For example, in this embodiment, the shut-off valve 8 is made entirely of 316 stainless steel, which has stronger corrosion resistance than 304 stainless steel.

[0033] It is worth noting that in this embodiment, the shut-off valve 8 may also be made of the same material as the pressure tapping pipe to ensure that the heat exchange rate of the medium is the same throughout the entire pressure tapping pipe assembly.

[0034] It should also be noted that in this embodiment, under low temperature conditions, a spiral guide vane can be added to the heat exchange cavity 104 to extend the medium residence time.

[0035] It should also be noted that the heat exchange chamber 104 can be designed as a spiral channel to increase the residence time of the medium within the heat exchange chamber 104 and improve heat exchange efficiency. The material of the heat exchange block 10 can be a metal with better thermal conductivity, such as copper or aluminum, to enhance the heat exchange effect. Furthermore, if the ambient temperature cannot reach the safe target temperature, heating equipment can be installed outside the heat exchange block 10 or on each pressure tap to raise the temperature of the medium. The heating equipment can be electric heating, steam heating, or hot water heating, depending on the actual application scenario.

[0036] In an exemplary embodiment, the heat exchange block 10 includes a first end cover 102, a second end cover 103, and a housing 101. The first end cover 102 and the second end cover 103 are respectively disposed at both ends of the housing 101, and the first end cover 102, the second end cover 103, and the housing 101 form a heat exchange cavity 104.

[0037] In this embodiment, the heat exchange chamber 104 is effectively formed through a split structure. The shell 101 is cylindrical in shape, and the first end cap 102 and the second end cap 103 are respectively assembled to the two ends of the shell 101, together forming a sealed heat exchange space. In this specific embodiment, the split manufacturing reduces the manufacturing difficulty of the heat exchange block 10, while the combined installation of the end caps and the shell 101 ensures assembly accuracy.

[0038] For example, in this embodiment, the first end cap 102 and the second end cap 103 are fixedly connected to the housing 101 by welding.

[0039] For example, in this embodiment, the first end cap 102 is provided with a first mounting hole 1021 and an input hole 1022, wherein the first mounting hole 1021 and the input hole 1022 are continuously arranged, the diameter of the first mounting hole 1021 is larger than the diameter of the input hole 1022, the first mounting hole 1021 is used to connect with the second pressure tap 9, and the input hole 1022 communicates with the heat exchange chamber 104. In this embodiment, by setting a continuous channel structure with a diameter gradient, the medium flow path is optimized while ensuring the pipe connection strength. In a specific embodiment, the first mounting hole 1021 is welded to the second pressure tap 9.

[0040] For example, the second end cap 103 is provided with a second mounting hole 1031 and an output hole 1032, which are continuously arranged. The diameter of the second mounting hole 1031 is larger than that of the output hole 1032. The second mounting hole 1031 is connected to the third pressure tap 11, and the output hole 1032 is connected to the heat exchange chamber 104. In this embodiment, by setting a stepped aperture structure, the larger diameter second mounting hole 1031 is used to connect to the third pressure tap 11, while the smaller diameter output hole 1032 maintains the medium flow pressure. In a specific embodiment, the second mounting hole 1031 is welded to the third pressure tap 11.

[0041] It is worth noting that in this embodiment, the diameter of the input port 1022 is larger than the diameter of the output port 1032. Specifically, because the diameter of the input port 1022 is larger than that of the output port 1032, the flow velocity of the medium in the heat exchange chamber 104 is reduced, and the residence time is correspondingly extended, so that the medium can fully absorb the heat of the heat exchange block 10 and ensure that it is heated to the target temperature before entering the differential pressure transmitter 13.

[0042] It should also be noted that in this embodiment, the inner diameters of the second pressure tap 9 and the third pressure tap 11 are the same, while the inner diameter of the heat exchange cavity 104 is larger than that of the second pressure tap 9 and the third pressure tap 11. By establishing a dimensional matching relationship between the heat exchange cavity 104 and the pressure taps, the low-temperature medium can obtain a longer residence time and a larger heat exchange area when flowing through the enlarged heat exchange cavity 104. Specifically, the medium flow velocity decreases due to the increased cross-sectional area of ​​the cavity, prolonging the contact time with the inner wall of the heat exchange block 10; at the same time, the enlarged inner diameter increases the heat exchange surface area, promoting the effective transfer of heat from the heat exchange block 10 to the medium. As a result, the medium temperature is significantly increased during the flow through the heat exchange cavity 104, and when the medium reaches the transmitter 13, its temperature is already within a safe range, thereby avoiding damage to the diaphragm of the transmitter 13 caused by low temperature. In a specific embodiment, the inner diameter of the heat exchange cavity 104 is 1.2-1.5 times the inner diameter of the second pressure tap 9.

[0043] In an exemplary embodiment, a plurality of connecting bolts 3 for interconnection are provided between the first orifice flange 1 and the second orifice flange 2, and the plurality of connecting bolts 3 are arranged in the circumferential direction of the first orifice flange 1 and the second orifice flange 2.

[0044] In this embodiment, three sets of circumferentially distributed connecting bolts provide a uniformly distributed axial clamping force to the flange mating surface. The symmetrical arrangement of the bolts effectively eliminates flange deflection torque, preventing localized gaps under medium pressure. Simultaneously, the circumferentially arranged bolts form a continuous closed fastening ring, maintaining a stable seal even under vibration conditions.

[0045] For example, the connecting bolts 3 can be made of high-strength alloy steel. In a preferred embodiment, the connecting bolts 3 are symmetrically distributed at equal angles along the flange circumference, with an angle interval of 30°-45°. Specifically, an annular groove can be machined on the flange mating surface, and the bolt holes are located on the outer flange of the groove.

[0046] In one exemplary embodiment, a first sealing gasket 5 is provided between the first orifice flange 1 and the throttling element 4, and a second sealing gasket 6 is provided between the second orifice flange 2 and the throttling element 4.

[0047] In this embodiment, an elastic sealing gasket is placed between the two orifice flanges and the throttling element 4. The compression deformation of the material fills the microscopic uneven surface, forming a physical sealing barrier. The symmetrically arranged sealing gaskets can balance the sealing pressure on both sides, avoiding sealing failure caused by stress concentration on one side. Specifically, under conditions of temperature or pressure fluctuations, the sealing gasket can compensate for the displacement changes between the flange and the throttling element 4 through elastic deformation, maintaining stable sealing performance.

[0048] For example, in this embodiment, the sealing gasket may be made of materials with elastic deformation capabilities, such as polytetrafluoroethylene, graphite composite material or metal spiral wound gasket.

[0049] This invention also proposes a design method for a multi-hole balanced flow meter, comprising the following steps: The 3D modeling process can utilize engineering software such as SolidWorks, CATIA, or ANSYS. Parametric modeling methods are used to accurately construct a digital model containing detailed features such as the geometry of the pressure tapping pipe, pipe diameter variations, and bend angles. Special attention must be paid to the structural details at the connection between the pressure tapping pipe and the flange during the modeling process to ensure that the model accurately reflects the actual flow conditions.

[0050] Secondly, the material, medium type, target temperature, and ambient temperature parameters of the pressure tapping assembly are set. The material selection range includes, but is not limited to, low-temperature resistant materials such as 316L stainless steel and Hastelloy; in this embodiment, 316L is selected. The medium type needs to be differentiated between different cryogenic working fluids such as liquid oxygen and liquid nitrogen; in this embodiment, liquid nitrogen is selected. The target temperature is typically set to a safety threshold 10-15℃ higher than the transmitter's minimum operating temperature; in this embodiment, the target temperature is selected as -40℃. The ambient temperature is determined based on the actual operating conditions of the installation site and is selected as 4℃. Based on the above parameters, the first heat transfer coefficient between the pipe wall and the medium, and the second heat transfer coefficient between the pipe wall and the environment are calculated using heat transfer formulas.

[0051] Then, based on the first and second heat transfer coefficients, the third heat transfer coefficient during medium flow is calculated using the superposition principle. In practice, an iterative algorithm can be employed, considering the influence of medium velocity on convective heat transfer, and the heat transfer coefficient can be corrected by calculating dimensionless parameters such as the Reynolds number and Prandtl number. In specific schemes, CFD simulation can be introduced to verify the accuracy of the calculated heat transfer coefficient.

[0052] Based on the third heat transfer coefficient, the specific heat capacity of the medium, and the target temperature rise requirement, the target length required for the medium to reach its target temperature is determined through integral calculation. Since the low-temperature medium will vaporize after reaching the target temperature, the target length can be obtained by calculating the length at which the medium reaches the target temperature during vaporization.

[0053] Finally, the installation location of the differential pressure transmitter 13 is determined based on the calculated target length. The determination of the installation location needs to take into account the site space constraints and maintenance convenience. Under the premise of ensuring the heat exchange length, priority should be given to the location of the pipe section with less vibration and easy insulation treatment.

[0054] For example, the simulation above yielded the relationship between the length of the pressure tapping tube and the temperature change. It shows that a 316L pressure tapping tube requires 400mm to restore liquid nitrogen from -196°C to -40°C at an ambient temperature of 4°C. Therefore, when using a multi-orifice flowmeter pressure tapping tube for measuring cryogenic media, the transmitter 13 should be installed at least 400mm higher than the sensor section. If the ambient temperature is lower than the preset ambient temperature in the model, appropriate heating measures should be taken, such as adding a heating shell to the outside of the pressure tapping tube assembly to assist in temperature rise.

[0055] It is worth noting that in the above design method, the pressure tapping assembly is simplified into a single pipe for ease of calculation. However, in actual application, the heat transfer coefficient of the material must be greater than the heat transfer coefficient of the material selected in the model.

[0056] In summary, this invention solves the problem that the transmitter 13 is easily damaged when it comes into direct contact with the medium during low-temperature fluid measurement by setting a heat exchange block 10 in the pressure tapping tube assembly to raise the temperature of the medium. At the same time, by accurately calculating the heat transfer coefficient and the target length, the medium temperature is kept stable, thus improving the measurement accuracy.

[0057] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A multi-hole balanced flow meter, characterized in that, include: A medium piping assembly, the medium piping assembly including a first orifice flange and a second orifice flange connected to each other, and a throttling element is provided between the first orifice flange and the second orifice flange; A pressure tapping assembly is provided on the first orifice plate flange and the second orifice plate flange respectively, and the pressure tapping assembly is in internal communication with the first orifice plate flange and the second orifice plate flange. The pressure tapping assembly includes a heat exchange block, and the heat exchange block is provided with a heat exchange cavity for heating the medium. Along the circumference of the throttling element, the angle of the pressure tapping assembly is set to 45°~135°. A transmitter is disposed at the output end of the pressure tap assembly; The pressure tapping assembly includes a first pressure tap, a shut-off valve, a second pressure tap, a third pressure tap, and a three-valve group connected sequentially from bottom to top. The heat exchange block is disposed between the second and third pressure taps, and the transmitter is connected to the three-valve group. The heat exchange block includes a first end cover, a second end cover, and a shell. The first end cover and the second end cover are respectively disposed at both ends of the shell, and the first end cover, the second end cover, and the shell form the heat exchange cavity. The first end cap is provided with a first mounting hole and an input hole, the first mounting hole and the input hole are continuously arranged, the diameter of the first mounting hole is larger than the diameter of the input hole, the first mounting hole is used to connect with the second pressure pipe, and the input hole is in communication with the heat exchange chamber; The second end cap is provided with a second mounting hole and an output hole. The second mounting hole and the output hole are continuously arranged. The diameter of the second mounting hole is larger than the diameter of the output hole. The second mounting hole is connected to the third pressure pipe, and the output hole is connected to the heat exchange chamber.

2. The multi-hole balanced flow meter according to claim 1, characterized in that: The diameter of the input hole is larger than the diameter of the output hole.

3. The multi-hole balanced flow meter according to claim 1, characterized in that: The inner diameter of the heat exchange cavity is larger than the inner diameter of the second pressure tap.

4. The multi-hole balanced flow meter according to claim 1, characterized in that: A plurality of connecting bolts for interconnection are provided between the first orifice flange and the second orifice flange, and the plurality of connecting bolts are arranged in the circumferential direction of the first orifice flange and the second orifice flange.

5. The multi-hole balanced flow meter according to claim 1, characterized in that: A first sealing gasket is provided between the first orifice flange and the throttling element, and a second sealing gasket is provided between the second orifice flange and the throttling element.

6. A design method for a multi-hole balanced flow meter, used in any one of the multi-hole balanced flow meters according to claims 1-5, characterized in that: Use 3D software to create a model of the sampling tube assembly; The material, medium type, target temperature and ambient temperature of the pressure tapping tube assembly are set. A first heat transfer coefficient is determined based on the material and medium type of the pressure tapping tube assembly, and a second heat transfer coefficient is determined based on the material and ambient temperature of the pressure tapping tube assembly. The third heat transfer coefficient is determined based on the first and second heat transfer coefficients when the medium flows in the pressure tap assembly. Based on the third heat transfer coefficient, the medium type, and the target temperature, determine the target length required for the medium in the pressure tap assembly to be heated to the target temperature; The installation location of the differential pressure transmitter is determined based on the target length.

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