Liquid chlorine crane pipe

Abstract

The utility model discloses a kind of liquid chlorine crane pipes, it is related to liquid chlorine conveying pipeline technical field, including stand, gas phase inner arm, liquid phase inner arm, gas phase outer arm, liquid phase outer arm, gas phase outer arm, liquid phase outer arm and conductive tape, gas phase inner arm one end is connected with gas phase export through a group of swivel joints, while being fixed on stand through inner wall locking piece, the other end is connected with gas phase outer arm through another group of swivel joints, spring cylinder balancing mechanism is equipped on gas phase outer arm;Liquid phase inner arm one end is connected with liquid phase import through a group of swivel joints, while being fixed on stand through inner wall locking piece, the other end is connected with liquid phase outer arm, spring cylinder balancing mechanism is also provided on liquid phase outer arm.The utility model in the present application, swivel joint adopts detachable modular design, is fixed by bolt connection, without cutting welding, can be disassembled and replaced, adapt to chemical plant scene to prohibit the operation requirement of firing, reduce maintenance difficulty and cost.

Description

Technical Field

[0001] This utility model belongs to the field of liquid chlorine transmission pipeline technology, specifically, it relates to a liquid chlorine loading arm. Background Technology

[0002] Liquid chlorine, chemically known as liquid chlorine, is a yellowish-green liquid with a boiling point of -34.6°C and a melting point of -103°C. It vaporizes into a gas under normal pressure. Inhalation can cause poisoning, and it is highly corrosive and toxic. Under sunlight, liquid chlorine mixed with other flammable gases can easily ignite and explode. Therefore, due to the high hazard of liquid chlorine, leak-free conditions must be ensured at every stage of its transportation.

[0003] Chinese utility model patent CN205398098U discloses a special loading arm for liquid chlorine. One end of the gas phase inner arm is connected to the gas phase outlet via a gas phase connector and is locked to a column. The other end is connected to the gas phase outer arm via a rotary joint. The gas phase outer arm is equipped with a spring cylinder balancing mechanism and is connected to the gas phase extension arm via an intermediate connecting assembly. The gas phase extension arm is equipped with a ball valve. One end of the liquid phase inner arm is connected to the liquid phase inlet via a liquid phase connector and is locked to a column. The other end is connected to the liquid phase outer arm, which is connected to the liquid phase extension arm. The rotary joint includes a flange, an outer ring, and an inner ring. The flange has a groove for a main seal, and an O-ring seal is provided outside the main seal. The inner ring has a secondary seal, a PTFE gasket, and a dustproof sealing ring. The outer ring has connecting bolts. A steel ball is provided between the inner and outer rings. The combination of the new rotary joint and ball valve not only eliminates leakage problems and avoids the harm of liquid chlorine to human health, but also effectively protects the entire loading arm and extends its service life.

[0004] In the above solution, although the new rotary joint can prevent leakage, the rotary joint is a vulnerable part, and the internal seals are prone to aging and deformation. When replacing it, the rotary joint needs to be cut off from the pipeline and a new rotary joint needs to be welded on, which brings a lot of trouble to the on-site work. Moreover, hot work is prohibited in chemical plant sites. In addition, there are no valves on the loading arm to deal with emergencies. If an emergency occurs, the loading arm will be pulled off, which will cause liquid chlorine leakage.

[0005] There are currently no effective solutions to the problems in the relevant technologies.

[0006] Therefore, in order to solve the above problems, this utility model provides a liquid chlorine loading arm. Utility Model Content

[0007] In order to overcome the above-mentioned technical problems, the purpose of this utility model is to provide a liquid chlorine loading arm.

[0008] The objective of this utility model can be achieved through the following technical solutions: A liquid chlorine loading arm includes a column, a gas phase inner arm, a liquid phase inner arm, a gas phase outer arm, a liquid phase outer arm, a gas phase extension arm, a liquid phase extension arm, and a conductive strip. One end of the gas phase inner arm is connected to a gas phase outlet via a set of rotary joints and is fixed to the column by an inner wall locking member. The other end is connected to the gas phase outer arm via another set of rotary joints. The gas phase outer arm is equipped with a spring cylinder balancing mechanism. One end of the liquid phase inner arm is connected to a liquid phase inlet via a set of rotary joints and is fixed to the column by an inner wall locking member. The other end is connected to the liquid phase outer arm. The liquid phase outer arm is also equipped with a spring cylinder balancing mechanism. Both the gas phase outer arm and the liquid phase outer arm are equipped with break-off valves. These break-off valves are emergency break-off valves, which seal the pipes at both ends through the valve disc when disconnected to prevent liquid chlorine leakage. Both the gas phase extension arm and the liquid phase extension arm are equipped with ball valves, which are special ball valves for liquid chlorine to enhance safety sealing. The rotary joint features a detachable modular design, comprising an upper flange, an outer ring, an inner ring, and a lower flange. The upper flange is connected to the outer ring via two sets of first bolts, and the lower flange is connected to the inner ring via two sets of second bolts. An annular track is formed between the outer and inner rings, and steel balls are installed within the annular track to support rotational movement. A primary seal is installed at the junction of the upper flange and the inner ring, near the media flow channel, and a secondary seal is installed at the junction of the upper flange and the inner ring, away from the media flow channel. An O-ring is installed between the outer and inner rings, and a gasket is installed between the lower flange and the inner ring.

[0009] As a preferred embodiment of this utility model, a nameplate for identifying technical parameters is installed at the middle position of the column.

[0010] As a preferred embodiment of this utility model, the conductive strip is divided into two groups. One group is detachably connected to the outer walls of the gas phase inner arm and the gas phase outer arm via a snap fastener, and the other group is detachably connected to the outer walls of the liquid phase outer arm and the liquid phase inner arm via a snap fastener.

[0011] As a preferred embodiment of this utility model, one end of both the gas phase extension arm and the liquid phase extension arm is provided with a loose flange for quick connection to external pipelines.

[0012] As a preferred embodiment of this invention, the pull-off valve is made of carbon steel lined with PTFE to improve its corrosion resistance.

[0013] As a preferred technical solution of this utility model, the ball valve includes a durable sealing structure and adopts a polytetrafluoroethylene valve seat to ensure stable operation in a liquid chlorine environment.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. Solve the problem of rotary joint replacement: The rotary joint adopts a detachable modular design and is fixed by bolt connection. It can be disassembled and replaced without cutting or welding, which is suitable for the operation requirements of chemical plant sites where hot work is prohibited, reducing maintenance difficulty and cost.

[0015] 2. Prevention of sudden leakage risk: Both the gas phase arm and the liquid phase arm are equipped with emergency disconnect valves. When the loading arm is accidentally disconnected, the valve disc automatically closes the pipelines at both ends, preventing liquid chlorine leakage from the source and solving the defect of no emergency protection valve.

[0016] 3. Enhanced sealing reliability: The rotary joint is equipped with a multi-seal structure consisting of a main seal, a secondary seal, an O-ring, and a gasket. The ball valve uses a PTFE seat specifically designed for liquid chlorine, and the breakaway valve uses carbon steel lined with PTFE, further improving corrosion resistance and adapting to the strong corrosiveness and toxicity of liquid chlorine.

[0017] 4. Improved ease of operation and connection: The spring cylinder balancing mechanism is equipped with a pneumatic pressure regulating device to reduce operating force; the gas / liquid phase extension arm is equipped with a loose flange to achieve quick connection of external pipelines; the conductive strip can be detached and connected by a buckle for easy installation and maintenance. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the rotary joint structure of this utility model.

[0020] Figure label: 1. Column; 2. Nameplate; 3. Inner wall locking parts; 4. Rotary joint; 5. Gas phase inner arm; 6. Gas phase outer arm; 7. Spring cylinder balancing mechanism; 8. Breakaway valve; 9. Gas phase extension arm; 10. Ball valve; 11. Loose flange; 12. Liquid phase extension arm; 13. Liquid phase outer arm; 14. Conductive strip; 15. Liquid phase inner arm; 16. Upper flange; 17. Outer ring; 18. Inner ring; 19. Lower flange; 20. First bolt; 21. Second bolt; 22. Main seal; 23. Secondary seal; 24. O-ring seal; 25. Steel ball; 26. Sealing gasket. Detailed Implementation

[0021] The utility model will now be further described with reference to the accompanying drawings and specific embodiments: Please see Figure 1 According to an embodiment of the present invention, a liquid chlorine loading arm includes a column 1, a gas phase inner arm 5, a liquid phase inner arm 15, a gas phase outer arm 6, a liquid phase outer arm 13, a gas phase extension arm 9, a liquid phase extension arm 12, and a conductive strip 14. One end of the gas phase inner arm 5 is connected to the gas phase outlet via a set of rotary joints 4 and is fixed to the column 1 via an inner wall locking member 3. The other end is connected to the gas phase outer arm 6 via another set of rotary joints 4. The gas phase outer arm 6 is provided with a spring cylinder balancing mechanism 7. One end of the liquid phase inner arm 15 is connected to the liquid phase inlet via a set of rotary joints 4 and is fixed to the column 1 via an inner wall locking member 3. The other end is connected to the liquid phase outer arm 13. The 13 is also equipped with a spring cylinder balancing mechanism 7. The column 1 serves as the support carrier for the entire loading arm. Its function is to fix the gas phase inner arm 5, the liquid phase inner arm 15 and related components, provide a stable installation foundation, ensure the load-bearing strength of each arm structure, avoid structural deformation or displacement caused by unstable support during operation, and ensure the stability and safety of the liquid chlorine transportation process. The inner wall locking part 3 is used to firmly fix the gas phase inner arm 5 and the liquid phase inner arm 15 to the column 1. The reliable locking force prevents the arm from loosening during rotation or operation, ensuring connection stability, while not affecting the normal movement of the arm through the rotary joint, thus balancing the reliability of fixation and the flexibility of movement. Please see Figure 1 Both the gas phase arm 6 and the liquid phase arm 13 are equipped with breakaway valves 8. Breakaway valves 8 are emergency breakaway valves. When disconnected, they seal the pipes at both ends through the valve disc to prevent liquid chlorine leakage. The emergency breakaway function is prioritized to disconnect when the loading arm is accidentally pulled (such as by a vehicle). The valve disc immediately seals the pipes at both ends to prevent liquid chlorine leakage from the source and avoid personal injury, equipment corrosion or environmental risks caused by corrosive liquid chlorine leakage, providing key safety assurance for liquid chlorine transportation. Please see Figure 1 Both the gas phase extension arm 9 and the liquid phase extension arm 12 are equipped with ball valves 10. The ball valves 10 are dedicated ball valves for liquid chlorine, which are used to enhance safety sealing. The ball valves are easy to operate and can quickly cut off or connect the liquid chlorine transport, adapting to the start and stop requirements during operation and ensuring the safety and stability of liquid chlorine transport. Please see Figure 2The rotary joint 4 is a detachable modular design, including an upper flange 16, an outer ring 17, an inner ring 18, and a lower flange 19. The upper flange 16 is connected to the outer ring 17 by two sets of first bolts 20, and the lower flange 19 is connected to the inner ring 18 by two sets of second bolts 21. An annular track is provided between the outer ring 17 and the inner ring 18, and steel balls 25 are installed in the annular track to support the rotational movement. A main seal 22 is provided at the junction of the upper flange 16 and the inner ring 18 and near the medium flow channel. A main seal 22 is provided at the junction of the upper flange 16 and the inner ring 18 and away from the main seal 22. A secondary seal 23 is installed at the location of the medium flow channel. An O-ring 24 is installed between the outer ring 17 and the inner ring 18. A gasket 26 is installed between the lower flange 19 and the inner ring 18. The rotary joint 4 adopts a detachable modular design to achieve flexible rotation of the arm. At the same time, the multi-stage sealing structure (main seal 22, secondary seal 23 and O-ring 24) prevents liquid chlorine leakage and solves the problem of troublesome replacement of rotary joints. The annular track supported by the steel ball 25 ensures smooth rotation. The bolt connection design allows for quick disassembly and reduces downtime.

[0022] Please see Figure 1 A nameplate 2 for marking technical parameters is installed in the middle of column 1. The purpose of nameplate 2 is to display equipment parameters and maintenance information, assist operators in the correct use and maintenance of loading arms, and reduce human error.

[0023] Please see Figure 1 The conductive strip 14 is divided into two groups. One group is detachably connected to the outer walls of the gas phase inner arm 5 and the gas phase outer arm 6 via buckles. The other group is detachably connected to the outer walls of the liquid phase outer arm 13 and the liquid phase inner arm 15 via buckles. The function of the conductive strip 14 is to discharge the static electricity generated during the transportation process, prevent sparks from causing an explosion, enhance safety in high-risk environments, and reduce the risk of fire.

[0024] Please see Figure 1 Both the gas phase extension arm 9 and the liquid phase extension arm 12 are equipped with a loose flange 11 at one end for quick connection to external pipelines. The loose flange 11 simplifies the connection between the loading arm and the external pipeline, allowing for quick loading and unloading, and is convenient to operate, making it suitable for industrial scenarios with frequent loading and unloading.

[0025] Please see Figure 1 The breakaway valve 8 is made of carbon steel lined with PTFE to improve corrosion resistance. The carbon steel PTFE-lined valve body can work reliably in extreme environments (such as high corrosion) and reduce the possibility of leakage.

[0026] Please see Figure 1 The ball valve 10 includes a durable sealing structure and uses a polytetrafluoroethylene valve seat to ensure stable operation in a liquid chlorine environment, reduce valve jamming or failure, and prevent safety accidents caused by seal aging.

[0027] The working principle of a liquid chlorine loading arm is as follows: The gas phase inner arm 5 and the liquid phase inner arm 15 are connected to the gas / liquid inlet and outlet respectively through modular rotary joints 4 and are fixed to the column 1. The gas phase outer arm 6 and the liquid phase outer arm 13 are connected to the corresponding inner arm through rotary joints 4. The outer arm is connected to the external conveying pipeline through loose flange 11 to form a liquid chlorine conveying channel. The outer ring 17 and inner ring 18 of the rotary joint 4 are supported by steel balls 25 to meet the flexible rotation requirements of the loading arm; the spring cylinder balancing mechanism 7 can adjust the position of the arm, reduce the force during operation, and improve the convenience of operation. The rotary joint 4 has a multi-seal structure, the PTFE valve seat of the liquid chlorine ball valve 10, and the carbon steel lined with PTFE of the breakaway valve 8, together to form a comprehensive sealing system to prevent liquid chlorine leakage; in case the loading arm is broken in an emergency, the breakaway valve disc will immediately close the pipeline and block the leakage path. The conductive strip 14 connects each arm to eliminate static electricity generated during the conveying process. The nameplate indicates the technical parameters to provide a reference for operation and maintenance. The detachable structural design (rotary joint, conductive strip) facilitates daily inspection and component replacement.

[0028] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A liquid chlorine loading arm, comprising a column (1), a gas phase inner arm (5), a liquid phase inner arm (15), a gas phase outer arm (6), a liquid phase outer arm (13), a gas phase extension arm (9), a liquid phase extension arm (12), and a conductive strip (14). One end of the gas phase inner arm (5) is connected to the gas phase outlet via a set of rotary joints (4) and is fixed to the column (1) via an inner wall locking member (3). The other end is connected to the gas phase outer arm (6) via another set of rotary joints (4). The gas phase outer arm (6) is provided with a spring cylinder balancing mechanism (7). One end of the liquid phase inner arm (15) is connected to the liquid phase inlet via a set of rotary joints (4) and is fixed to the column (1) via an inner wall locking member (3). The other end is connected to the liquid phase outer arm (13). The liquid phase outer arm (13) is also provided with a spring cylinder balancing mechanism (7). : Both the gas phase outer arm (6) and the liquid phase outer arm (13) are equipped with break-off valves (8). The break-off valves (8) are emergency break-off valves. When disconnected, they seal the pipes at both ends through the valve disc to prevent liquid chlorine leakage. Both the gas phase extension arm (9) and the liquid phase extension arm (12) are equipped with ball valves (10), which are special ball valves for liquid chlorine and are used to enhance safety sealing. The rotary joint (4) is a detachable modular design, including an upper flange (16), an outer ring (17), an inner ring (18), and a lower flange (19). The upper flange (16) is connected to the outer ring (17) by two sets of first bolts (20), and the lower flange (19) is connected to the inner ring (18) by two sets of second bolts (21). An annular track is provided between the outer ring (17) and the inner ring (18), and a steel ball (25) is provided in the annular track to support the rotational movement. A main seal (22) is provided at the junction of the upper flange (16) and the inner ring (18) and near the medium flow channel. A secondary seal (23) is provided at the junction of the upper flange (16) and the inner ring (18) and away from the medium flow channel. An O-ring (24) is provided between the outer ring (17) and the inner ring (18), and a gasket (26) is provided between the lower flange (19) and the inner ring (18).

2. A liquid chlorine loading arm according to claim 1, characterized in that: A nameplate (2) for identifying technical parameters is installed at the middle position of the column (1).

3. A liquid chlorine loading arm according to claim 1, characterized in that: The conductive strip (14) is divided into two groups. One group is detachably connected to the outer walls of the gas phase inner arm (5) and the gas phase outer arm (6) by a snap fastener. The other group is detachably connected to the outer walls of the liquid phase outer arm (13) and the liquid phase inner arm (15) by a snap fastener.

4. A liquid chlorine loading arm according to claim 1, characterized in that: Both the gas phase extension arm (9) and the liquid phase extension arm (12) are provided with a loose flange (11) at one end for quick connection to external pipelines.

5. A liquid chlorine loading arm according to claim 1, characterized in that: The pull-off valve (8) is made of carbon steel lined with PTFE to improve corrosion resistance.

6. A liquid chlorine loading arm according to claim 1, characterized in that: The ball valve (10) includes a durable sealing structure and a polytetrafluoroethylene seat to ensure stable operation in a liquid chlorine environment.

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