Multifunctional connecting device
By installing a drain and vent pipe and a drain valve between the boundary blind plate and the boundary valve, the safety issues of start-up, shutdown, replacement, and purging operations in petrochemical refining enterprises are solved, and the progress of replacement and the residual status of the medium are effectively checked, ensuring the safety and reliability of the operation.
Patent Information
- Application Number
- CN202422845525.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-21
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2034-11-21
AI Technical Summary
In petrochemical refining enterprises, during start-up, shutdown, replacement, purging, and blind flange removal operations, it is impossible to effectively check the replacement and purging progress. Residual media cannot be discharged, or there is media on one side that cannot be removed from the blind flange, posing a safety risk.
Design a multifunctional connection device including a boundary blind plate, a boundary valve, a drain and vent pipe, an vent valve, and a drain valve. The device is connected by a flange, and the vent valve is used to discharge gas and the drain valve is used to discharge liquid. The device can check the replacement progress and the residual medium to ensure safe operation.
It effectively solves the problems of inability to inspect during replacement purging and inability to discharge residual media, ensuring the safety and reliability of pipeline operations in the start-up and shutdown boundary areas.
Smart Images
Figure CN223537405U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of petrochemical production technology, specifically relating to a multifunctional connecting device. Background Technology
[0002] Petrochemical refining enterprises involve different units, with numerous material transport pipelines between them. Each material pipeline entering and exiting a unit is equipped with a boundary valve 2 and a boundary blind flange 1, typically as follows: Figure 1 As shown, Figure 1 Figure (a) shows a type A combination, where both boundary blind flange 1 and boundary valve 2 are installed on pipe 4, with boundary valve 2 located upstream of boundary blind flange 1. Figure 1 Figure (b) shows the B-type combination. The difference is that a boundary valve 2 is set on the upstream and downstream sides of the boundary blind plate 1. After the boundary valve 2 of both types is closed, residual medium 3 will still remain. Due to unreasonable design, there are problems and risks such as inability to check the replacement and purging progress, inability to discharge residual medium, or inability to switch blind plates when starting, stopping, replacing, purging, or switching blind plates. Utility Model Content
[0003] The purpose of this utility model is to provide a multifunctional connecting device to solve problems such as the inability to check the progress of replacement and purging, the inability to discharge residual media, or the inability to reposition blind plates when there is media on one side during start-up, shutdown, replacement, purging, and blind plate repositioning operations.
[0004] The technical solution adopted by this utility model is a multi-functional connection device, including a boundary blind plate, a boundary valve, and a pipeline. The boundary blind plate and the boundary valve are both installed on the pipeline. The boundary valve is installed on the upstream side of the boundary blind plate or on the upstream and downstream sides of the boundary blind plate. A drain and vent pipe, a vent valve, and a drain valve are also installed between the boundary blind plate and the boundary valve. The vent valve is installed at the top of the drain and vent pipe, and the drain valve is installed at the bottom of the drain and vent pipe.
[0005] Preferably, the pipeline and the boundary valve are connected by a flange.
[0006] Preferably, the boundary valve and the drain and vent pipe are connected by a flange.
[0007] Preferably, the length of the drain pipe is 0.4-0.6m.
[0008] Preferably, the boundary blind flange is a flange-clamp figure-eight blind flange, which is a figure-eight blind flange with flange interfaces on both sides.
[0009] Preferably, the flange-type figure-eight blind flange and the drain and vent pipe are connected by a flange.
[0010] Preferably, the flange-clamp figure-eight blind flange is made of carbon steel, stainless steel, or an alloy.
[0011] Preferably, the boundary valve is a gate valve, a stop valve, or a ball valve.
[0012] Preferably, the pipeline is divided into an upstream pipeline and a downstream pipeline, the boundary valve is divided into an upstream boundary valve and a downstream boundary valve, and the drain and vent pipe is divided into an upstream drain and vent pipe and a downstream drain and vent pipe.
[0013] Preferably, the drain valve is a stop valve, a butterfly valve, or a ball valve.
[0014] The beneficial effects of this utility model are as follows:
[0015] This utility model's multifunctional connecting device can effectively solve problems such as the inability to inspect during replacement and purging, the inability to discharge residual media, and the inability to replace blind flanges when there is media on one side, ensuring the safety of replacement, purging, and blind flange replacement operations in the pipeline of the equipment's start-up and shutdown boundary.
[0016] This utility model includes a drain and vent pipe, a vent valve, and a drain valve between the boundary blind plate and the boundary valve. The vent valve is used to release gas during pipeline purging when work is stopped and pipeline replacement when work is started. The vent valve is also used to check residual pressure before blind plate replacement. The drain valve is used to check the replacement progress during pipeline replacement when work is started or stopped. The drain valve is used to drain liquid and check the pipeline purging progress in the early stage of pipeline purging when work is started or stopped. The drain valve is also used to check the residual medium before blind plate replacement. Attached Figure Description
[0017] Figure 1 The diagrams show the connection configurations of existing boundary valves and boundary blind flanges. Figure (a) shows the connection configuration of type A boundary valves and boundary blind flanges, and Figure (b) shows the connection configuration of type B boundary valves and boundary blind flanges.
[0018] Figure 2 This is a schematic diagram of the structure of the multifunctional connecting device of this utility model.
[0019] In the diagram: 1. Boundary blind flange; 2. Boundary valve; 3. Residual medium; 4. Pipeline; 5. Drain and vent pipe; 6. Vent valve; 7. Drain valve. Detailed Implementation
[0020] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.
[0021] Example 1
[0022] The multifunctional connecting device of this utility model, such as Figure 2As shown, the system includes a boundary blind plate 1, a boundary valve 2, and a pipe 4. Both the boundary blind plate 1 and the boundary valve 2 are installed on the pipe 4. The boundary valve 2 is installed on the upstream side of the boundary blind plate 1 or on both the upstream and downstream sides of the boundary blind plate 1. A drain and vent pipe 5, a vent valve 6, and a drain valve 7 are also installed between the boundary blind plate 1 and the boundary valve 2. The vent valve 6 is installed at the top of the drain and vent pipe 5, and the drain valve 7 is installed at the bottom of the drain and vent pipe 5.
[0023] Example 2
[0024] Based on Example 1, in this example, the pipe 4 and the boundary valve 2 are connected by a flange.
[0025] Alternatively, the boundary valve 2 can be a gate valve, stop valve, or ball valve, etc. By closing the boundary valve 2 to isolate the material in the pipeline 4, it provides media isolation protection for the boundary blind flange replacement operation and ensures safe operation.
[0026] The drain and vent pipe 5 is set horizontally, the vent valve 6 is set at the top of the drain and vent pipe 5, and the drain valve 7 is set at the bottom of the drain and vent pipe 5.
[0027] The length of the drain and vent pipe 5 is 0.4-0.6m.
[0028] The exhaust valve 6 is used for gas discharge during pipeline purging when work is stopped, pipeline replacement when work is started, and checking residual pressure before blind flange operation.
[0029] During operation, after connecting the vent valve 6 to the pressure gauge, the vent valve should be opened slowly and slightly to gradually release the pressure in the system. Closely observe the pressure gauge reading and record the initial residual pressure of the system. Ensure that the system is in a stable state without external interference when reading the pressure value. Slowly and gradually open the vent valve 6 to allow the gas in the system to gradually escape, recording the pressure values at different time points to understand the trend and rate of pressure drop. By analyzing the pressure change curve, the sealing performance and operating status of the system can be evaluated. Based on the pressure values recorded during the inspection, compare the actual measured pressure values with the parameters used in the system design to assess whether there are significant differences and whether these differences exceed the allowable range.
[0030] The drain valve 7 is used to check the replacement progress during pipeline replacement, to discharge liquid in the early stage of pipeline purging, to check the pipeline purging progress, and to check the residual medium before blind flange operation. The medium in the drain and vent pipe 5 is allowed to flow out naturally through the drain valve 7 by gravity.
[0031] The drain valve 7 is a stop valve, butterfly valve, or ball valve.
[0032] During operation, the drain valve 7 should be opened slowly to avoid liquid splashing or impact caused by sudden pressure changes. In the initial stage of draining, the condition of the discharged medium should be closely observed, paying attention to any abnormal color, odor, or other abnormal phenomena. After confirming that the initial flow is normal, the opening of the drain valve 7 can be gradually increased to release the liquid in stages. As the valve opening increases, observe the changes in the characteristics of the medium.
[0033] Boundary blind flange 1 is a flange-momentum figure-eight blind flange. A flange-momentum figure-eight blind flange is a figure-eight blind flange with flange interfaces on both sides. Half of the figure-eight blind flange is a blind flange and the other half is an iron ring. The material is carbon steel, stainless steel, or alloy. It can be selected according to the pipeline pressure level and pipeline medium. The flange interfaces on both sides of the figure-eight blind flange can be easily connected to the pipeline system, enabling quick installation and disassembly.
[0034] Example 3
[0035] In some specific embodiments, based on the flow direction of the medium and the position of the medium relative to the boundary blind plate 1, the pipeline 4 can be divided into an upstream pipeline and a downstream pipeline, the boundary valve 2 can be divided into an upstream boundary valve and a downstream boundary valve, and the drain and vent pipe 5 can be divided into an upstream drain and vent pipe and a downstream drain and vent pipe.
[0036] The upstream pipeline is connected to the upstream boundary valve via a flange. The upstream boundary valve is typically a gate valve, globe valve, or ball valve. By closing the upstream boundary valve, the incoming material to the upstream unit is isolated, providing a medium isolation guarantee for the replacement operation of boundary blind flange 1.
[0037] The upstream drainage and venting pipe section is 0.4-0.6m long. An venting valve 6 is installed at the top of the upstream drainage and venting pipe for venting gas during upstream pipeline purging when work is stopped, during upstream pipeline replacement when work is started, and for checking residual pressure before blind flange operation. A drainage valve 7 is installed at the bottom for checking replacement progress during upstream pipeline replacement when work is started or stopped, for venting liquid in the early stage of upstream pipeline purging, or for checking the progress of upstream pipeline purging and checking the residual medium before blind flange operation.
[0038] The flange-type figure-eight blind flange is used for media flow or isolation during production and shutdown maintenance.
[0039] The downstream drainage and venting pipe section is 0.4-0.6m long. A venting valve 6 is installed at the top of the downstream drainage and venting pipe for gas discharge during reverse purging of the downstream pipeline when the work is stopped, reverse replacement of the downstream pipeline when the work is started, and checking residual pressure before blind flange operation. A drainage valve 7 is installed at the bottom for checking the replacement progress during reverse replacement of the downstream pipeline when the work is started or stopped, for liquid discharge in the early stage of reverse purging of the downstream pipeline when the work is started or stopped, or for checking the progress of reverse purging of the downstream pipeline and checking the residual medium before blind flange operation.
[0040] The downstream pipeline is connected to the downstream boundary valve via a flange. The downstream boundary valve is typically a gate valve, globe valve, or ball valve. By closing the downstream boundary valve, the backflow of materials from the downstream unit is prevented, providing a medium isolation guarantee for boundary blind flange replacement operations.
[0041] Components and structures not described in detail in the embodiments are well-known components, common structures or common means in the industry, and will not be described in detail here.
Claims
1. A multifunctional connection device, comprising a boundary blind plate (1), a boundary valve (2), and a pipeline (4), wherein the boundary blind plate (1) and the boundary valve (2) are both disposed on the pipeline (4), and the boundary valve (2) is disposed on the upstream side of the boundary blind plate (1) or on both the upstream and downstream sides of the boundary blind plate (1), characterized in that, Between the boundary blind plate (1) and the boundary valve (2), a drain and vent pipe (5), a vent valve (6), and a drain valve (7) are also provided. The vent valve (6) is located at the top of the drain and vent pipe (5), and the drain valve (7) is located at the bottom of the drain and vent pipe (5).
2. The multifunctional connecting device according to claim 1, characterized in that, The pipe (4) and the boundary valve (2) are connected by a flange.
3. The multifunctional connecting device according to claim 1, characterized in that, The boundary valve (2) and the drain and exhaust pipe (5) are connected by a flange.
4. The multifunctional connecting device according to claim 1, characterized in that, The length of the drain pipe (5) is 0.4-0.6m.
5. The multifunctional connecting device according to claim 1, characterized in that, The boundary blind plate (1) is a flange-clamp figure-eight blind plate, which is a figure-eight blind plate with flange interfaces on both sides.
6. The multifunctional connecting device according to claim 5, characterized in that, The flange-type figure-eight blind flange and the drain and exhaust pipe (5) are connected by a flange.
7. The multifunctional connecting device according to claim 5, characterized in that, The flange-type figure-eight blind flange is made of carbon steel, stainless steel, or alloy.
8. The multifunctional connecting device according to claim 1, characterized in that, The boundary valve (2) is a gate valve, a stop valve, or a ball valve.
9. The multifunctional connecting device according to claim 1, characterized in that, The pipeline (4) is divided into an upstream pipeline and a downstream pipeline, the boundary valve (2) is divided into an upstream boundary valve and a downstream boundary valve, and the drain and vent pipe (5) is divided into an upstream drain and vent pipe and a downstream drain and vent pipe.
10. The multifunctional connecting device according to claim 1, characterized in that, The drain valve (7) is a stop valve, a butterfly valve, or a ball valve.