A pressure transmitter isolation tank

Abstract

This utility model discloses a pressure transmitter isolation tank, including a flange, a pressure tapping pipe, an isolation tank, and a pressure transmitter. The pressure tapping pipe is vertically fixed at the center of the flange, and its other end is vertically fixed to the upper side wall of the isolation tank, communicating with the interior of the tank. A pressure transmitter interface is located at the bottom of the side wall of the isolation tank, and the pressure transmitter is connected to this interface. An isolation tank cover is located at the center of the top of the isolation tank, and a sealing bolt is fitted at the cover. This utility model isolates the production medium from the pressure transmitter using an inert medium within the isolation tank, preventing the transmitter diaphragm from directly contacting corrosive media and significantly extending its service life. The inert medium is perfluorotributylamine, which is chemically stable and can accurately transmit pressure signals, ensuring the accuracy of negative pressure measurement and meeting the precision requirements of production monitoring.

Description

Technical Field

[0001] This utility model relates to the technical field of pressure measurement and isolation, and in particular to an isolation tank for a pressure transmitter. Background Technology

[0002] In the production of anhydrous hydrofluoric acid, measuring negative pressure is a crucial step, playing a key role in ensuring the stability, safety, and environmental performance of the production process. Anhydrous hydrofluoric acid production units are typically equipped with a comprehensive, online, multi-point negative pressure monitoring system that can monitor the negative pressure status of the process system in real time. Currently, negative pressure measurement is mainly achieved by installing pressure transmitters at the monitoring points. However, because these pressure transmitters are in direct contact with the highly corrosive media (such as anhydrous hydrofluoric acid and its derivatives) during production, the diaphragms of the pressure transmitters are easily corroded. This not only significantly shortens the lifespan of the pressure transmitters but also makes it difficult to guarantee the accuracy of the monitoring data, posing potential risks to production. Utility Model Content

[0003] This invention aims to solve the problems of diaphragm corrosion, shortened lifespan, and inaccurate measurement caused by direct contact between pressure transmitters and anhydrous hydrofluoric acid production media in the prior art. It provides a pressure transmitter isolation tank that can isolate corrosive media, extend the lifespan of pressure transmitters, and ensure measurement accuracy.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A pressure transmitter isolation tank includes a flange, a pressure tapping pipe, an isolation tank, and a pressure transmitter. The pressure tapping pipe is vertically fixed at the middle of the flange, and the other end of the pressure tapping pipe is vertically fixed to the upper side wall of the isolation tank, and the pressure tapping pipe communicates with the interior of the isolation tank. A pressure transmitter interface is provided at the bottom of the side wall of the isolation tank, and a pressure transmitter is connected to the pressure transmitter interface. An isolation tank cover is provided at the center of the top of the isolation tank, and a sealing bolt is matched at the isolation tank cover.

[0006] The isolation tank is filled with an inert medium, and the liquid level of the inert medium does not exceed the connection port between the pressure tap and the isolation tank, so as to prevent the medium from flowing back from the pressure tap.

[0007] The inert medium is perfluorotributylamine, which has strong chemical stability, does not react with anhydrous hydrofluoric acid, and is suitable for pressure transmission.

[0008] The flange, pressure pipe, and isolation tank are all made of corrosion-resistant Hastelloy alloy material;

[0009] The connection between the flange and the pressure pipe is reinforced with a seal; the connection between the pressure pipe and the isolation tank is reinforced with a seal; the isolation tank and the isolation tank cover are reinforced with a seal, which is achieved by welding and then applying a layer of corrosion-resistant silicone rubber sealant.

[0010] A corrosion-resistant polytetrafluoroethylene (PTFE) gasket is installed between the lid of the isolation tank and the sealing bolts to ensure that the inert medium inside the tank does not leak.

[0011] The beneficial effects of this invention are as follows: the inert medium inside the isolation tank isolates the production medium from the pressure transmitter, preventing the pressure transmitter diaphragm from directly contacting the corrosive medium and significantly extending its service life; the inert medium is perfluorotributylamine, which has stable chemical properties and can accurately transmit pressure signals, ensuring the accuracy of negative pressure measurement and meeting the precision requirements of production monitoring; the entire system is made of polytetrafluoroethylene or Hastelloy, with multiple sealing reinforcement designs, which can withstand the strong corrosion of the anhydrous hydrofluoric acid production environment, reducing the equipment failure rate; the inert medium can be quickly replaced or the internal structure can be inspected through the isolation tank cover without disassembling the entire equipment, shortening maintenance time. Attached Figure Description

[0012] Figure 1 This is a cross-sectional view of the structure of this utility model;

[0013] In the diagram: 1. Flange; 2. Pressure tap; 3. Isolation tank cover; 4. Isolation tank; 5. Pressure transmitter interface; 6. Pressure transmitter; 7. Sealing bolt. Detailed Implementation

[0014] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0015] Example 1

[0016] like Figure 1As shown, this utility model provides a pressure transmitter isolation tank, the structure of which includes a flange 1, a pressure tapping pipe 2, an isolation tank 4, and a pressure transmitter 6; the flange 1 is a circular flange with mounting holes, nominal diameter DN50, suitable for anhydrous hydrofluoric acid pipeline standards, and a pressure tapping pipe 2 is vertically fixed in the middle position; the pressure tapping pipe 2 is a hollow pipe with a diameter of φ10mm, the other end of which is vertically fixedly connected to the upper side wall of the isolation tank 4, at 1 / 3 of the height from the top of the isolation tank 4, and the pressure tapping pipe 2 communicates with the interior of the isolation tank 4; the isolation tank 4 is a cylindrical sealed tank with a volume of 500mL, and a pressure transmitter interface 5 with a thread specification of M20×1.5 is provided at the bottom of its side wall (1 / 4 of the height from the bottom of the tank), and the pressure transmitter interface 5 is connected to the pressure transmitter 6 by thread; the center of the top of the isolation tank 4 is provided with an isolation tank cover opening 3 with an inner diameter of φ20mm, and a sealing bolt 7 with a thread specification adapted to the tank cover opening is provided at the isolation tank cover opening 3;

[0017] The isolation tank 4 is filled with an inert medium, and the liquid level of the inert medium does not exceed the connection port between the pressure tap 2 and the isolation tank 4, that is, the liquid level is 5-10 mm lower than the lower port of the pressure tap 2; the inert medium is perfluorotributylamine.

[0018] The flange 1, pressure pipe 2, and isolation tank 4 are all made of corrosion-resistant Hastelloy alloy material;

[0019] The connection between the flange 1 and the pressure pipe 2 is reinforced with a seal; the connection between the pressure pipe 2 and the isolation tank 4 is reinforced with a seal; the connection between the isolation tank 4 and the isolation tank cover 3 is reinforced with a seal, which is achieved by welding and then applying a layer of silicone rubber sealant.

[0020] A corrosion-resistant polytetrafluoroethylene sealing gasket is provided between the isolation tank cover 3 and the sealing bolt 7.

[0021] Working Principle: Flange 1 is bolted to the negative pressure monitoring point of the anhydrous hydrofluoric acid production unit, such as the top of the reactor or the negative pressure section of the pipeline. The corrosive medium in production, containing anhydrous hydrofluoric acid vapor and a small amount of liquid, enters the pressure tapping pipe 2 through flange 1. The pressure tapping pipe 2 transmits the medium pressure to the inert medium in the isolation tank 4. Since perfluorotributylamine does not react with the corrosive medium and its density is greater than that of the medium vapor, a stable liquid seal can be formed. The inert medium transmits the negative pressure signal to the pressure transmitter 6 through liquid pressure conduction. The pressure transmitter 6 monitors and outputs pressure data in real time. Through the isolation effect of the isolation tank 4, the corrosive medium never comes into contact with the diaphragm of the pressure transmitter 6, achieving safe and accurate negative pressure measurement. When maintenance is required, the inert medium can be replaced or the internal structure of the tank can be repaired by unscrewing the sealing bolt 7, making the operation convenient.

Claims

1. A pressure transmitter isolation tank, characterized in that: The device includes a flange, a pressure tap, an isolation tank, and a pressure transmitter. The pressure tap is vertically fixed at the center of the flange, and the other end of the pressure tap is vertically fixed to the upper side wall of the isolation tank, with the pressure tap communicating with the interior of the isolation tank. A pressure transmitter interface is provided at the bottom of the side wall of the isolation tank, and a pressure transmitter is connected to the pressure transmitter interface. An isolation tank cover is provided at the center of the top of the isolation tank, and a sealing bolt is provided at the isolation tank cover.

2. The pressure transmitter isolation tank according to claim 1, characterized in that: The isolation tank is filled with an inert medium, and the liquid level of the inert medium does not exceed the connection port between the pressure tap and the isolation tank.

3. The pressure transmitter isolation tank according to claim 2, characterized in that: The inert medium is perfluorotributylamine.

4. The pressure transmitter isolation tank according to claim 1, characterized in that: The flange, pressure pipe, and isolation tank are all made of Hastelloy alloy.

5. A pressure transmitter isolation tank according to claim 1, characterized in that: The connection between the flange and the pressure pipe is reinforced with a seal; the connection between the pressure pipe and the isolation tank is reinforced with a seal; the isolation tank and the isolation tank cover are reinforced with a seal, which is achieved by welding and then applying a layer of silicone rubber sealant.

6. A pressure transmitter isolation tank according to claim 1, characterized in that: A polytetrafluoroethylene (PTFE) sealing gasket is provided between the lid of the isolation tank and the sealing bolt.

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