Centrifugal compression heat exchanger leakage judgment device and use method

Abstract

The invention discloses a centrifugal compression heat exchanger leakage judgment device and a using method, and relates to the technical field of heat exchangers, the centrifugal compression heat exchanger leakage judgment device comprises a lifting appliance, a pressure test cylinder, a first valve, a second valve and a pressing piece, the lifting appliance is provided with a plurality of bolt holes, and fixing bolts at the top of a heat exchanger penetrate through the bolt holes so that the heat exchanger can be fixed through the lifting appliance; the top of the lifting appliance is connected with lifting equipment; a water injection hole and a water drainage hole are formed in the side wall of the pressure test cylinder, and a leakage measurement station is formed in the pressure test cylinder and used for placing a heat exchanger; the first valve is arranged in the water injection hole; the second valve is arranged in the drainage hole; the pressing piece is used for being detachably and fixedly connected with the top of the pressure testing cylinder and pressing the heat exchanger so that the top and the bottom of the pressure testing cylinder can be both connected with the heat exchanger in a sealed mode, the structure is simple, use is convenient, follow-up rework operation is effectively avoided, and working efficiency is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchangers, and particularly to a leakage judgment device and a use method for a centrifugal compression heat exchanger. Background Art

[0002] The centrifugal compressor is a type of vane rotary compressor (i.e., a turbocompressor). In a centrifugal compressor, the centrifugal force exerted on the gas by the high-speed rotating impeller and the pressure augmentation effect on the gas in the diffuser passage increase the gas pressure. In the early days, since this type of compressor was only suitable for low and medium pressure, large flow rate applications, it was not given much attention. With the achievements in gas dynamics research, the efficiency of centrifugal compressors has been continuously improved. Also, due to the successful development of key technologies such as high-pressure seals, machining of small-flow narrow impellers, and multi-oil wedge bearings, a series of problems in the development of centrifugal compressors towards high pressure and wide flow rate ranges have been solved, greatly expanding the application scope of centrifugal compressors. As a result, in many cases, they can replace reciprocating compressors, significantly expanding their application range. Our company has several centrifugal compressors of various models. Among them, there are 3 Ingersoll Rand C series compressors, with a relatively high level of overall automatic control. The compressor and the drive device are directly coupled through an elastic coupling and installed on a common base plate with its own lubrication system, control system, and auxiliary system. Each stage of the pinion gear is equipped with a cantilever open impeller and is directly driven by the large gear. After each impeller is a floating carbon ring shaft seal. Because of the high rotational speed, high precision is required for equipment maintenance. It plays an important role in the gas supply of Baotou Steel. Therefore, if a unit failure leads to a long-term shutdown, it will affect the gas demand of downstream users. Currently, these 3 units are operating in parallel all year round. Long-term operation results in this type of unit being overhauled at least 3 - 5 times a year due to heat exchanger problems. When overhauling the heat exchanger, because the structure of this unit is relatively special, it consists of two half shells. One half shell installs the heat exchanger, and the other half shell installs the rotor. The two half shells are connected together by 48 M4 bolts. The four groups of heat exchangers are embedded in the four mounting holes of the shell. The four mounting holes are arranged in a cross shape. When the heat exchanger is installed in the mounting hole, a sealed cavity is formed between the barrel wall of the heat exchanger and the hole wall of the shell through two gaskets on its upper and lower sides. During normal operation, cooling water is filled in the sealed cavity between the hole wall of the mounting hole and the barrel wall of the cooler to cool the heat exchanger. During overhaul, first, the connecting bolts of the two half shells need to be disassembled. Then, the half shell with the heat exchanger installed is laid down with the mounting hole surface of the heat exchanger facing up. Then, the heat exchangers are pulled out from the mounting holes respectively. Then, the heat exchangers are cleaned or replaced. The processed heat exchangers are placed into their respective holes in the corresponding removal order. The shell is erected and then connected to the other half shell. Due to the special structure of this unit, we often encounter the following two problems during actual maintenance. 1. Only after connecting the two half shells can water be supplied to the heat exchanger. If water is discharged from the gas side steam trap of the heat exchanger after water supply, it indicates that the heat exchanger is leaking. Or, because the steam trap is often blocked and no water flows out from the steam trap during water supply, it is judged that the heat exchanger is not leaking, but the unit trips when starting up. At this time, to deal with the heat exchanger, the connecting bolts of the two half shells need to be disassembled again. Then, the shell on the heat exchanger side is laid flat, and the problematic heat exchanger is lifted out from its mounting hole for replacement.After reinstalling all parts, continue to conduct a water leakage test. If there are still problems, continue to disassemble and replace the heat exchanger 2. Since the cooling water fills the space between the shell wall and the cylinder wall, long-term corrosion will make it time-consuming and laborious to lift the heat exchanger out of the hole position. Many existing lifting tools cannot meet the usage requirements and there are certain safety hazards. These two problems lead to slow operation progress, waste a lot of manpower and material resources, increase the labor intensity of the operators, and are extremely prone to safety accidents during the operation.

[0003] Therefore, it is necessary to provide a method for detecting heat exchanger leakage, which can determine whether the heat exchanger leaks before it is installed into the hole position, avoiding subsequent rework operations, saving manpower and improving work efficiency. Summary of the Invention

[0004] The purpose of the present invention is to provide a centrifugal compression heat exchanger leakage judgment device and a usage method to solve the problems existing in the above-mentioned prior art, with a simple structure, convenient use, effectively avoiding subsequent rework operations, and effectively improving work efficiency.

[0005] To achieve the above object, the present invention provides the following solution:

[0006] The present invention provides a centrifugal compression heat exchanger leakage judgment device, including: a lifting tool, a pressure test cylinder, a first valve, a second valve and a pressing member. The lifting tool is provided with a plurality of bolt holes for the fixing bolts at the top of the heat exchanger to pass through so that the lifting tool fixes the heat exchanger. The top of the lifting tool is used to connect with the hoisting equipment; the side wall of the pressure test cylinder is provided with a water injection hole and a drain hole, and a leakage measurement station is formed inside the pressure test cylinder for placing the heat exchanger; the first valve is arranged at the water injection hole; the second valve is arranged at the drain hole; the pressing member is used to detachably and fixedly connect with the top of the pressure test cylinder and press the heat exchanger so that both the top and the bottom of the pressure test cylinder are hermetically connected with the heat exchanger.

[0007] Preferably, a first ring plate is arranged inside the bottom edge of the pressure test cylinder for hermetically abutting against the bottom of the heat exchanger.

[0008] Preferably, it further includes a first fluororubber gasket arranged on the top surface of the first ring plate to hermetically abut against the bottom of the heat exchanger.

[0009] Preferably, a second ring plate is arranged outside the top edge of the pressure test cylinder for hermetically abutting against the top edge of the heat exchanger.

[0010] Preferably, it further includes a second fluororubber gasket arranged on the top surface of the second ring plate to hermetically abut against the top edge of the heat exchanger.

[0011] Preferably, the pressing member includes a plurality of pressing plates, a plurality of locking bolts and a plurality of locking nuts. A first through hole is provided at a first end of the pressing plate. A plurality of connecting plates are provided on an outer side of the first ring plate. The connecting plate is provided with a second through hole. The locking bolt is configured to pass through the first through hole and the second through hole and be threadedly connected to the locking nut so that a second end of the pressing plate is used to press against a top of the heat exchanger.

[0012] Preferably, the connecting plates are uniformly arranged along a circumference of the second ring plate.

[0013] Preferably, the number of the connecting plates is 16, and the number of the pressing plates is not less than 8.

[0014] Preferably, the lifting device is a third ring plate.

[0015] Preferably, it further includes a plurality of lifting rings. Each of the lifting rings is fixedly connected to a top of the third ring plate and is uniformly arranged along a circumference of the third ring plate.

[0016] The present invention also provides a method for using the centrifugal compression heat exchanger leakage judgment device according to any one of the above, including the following steps:

[0017] Install the lifting device on the heat exchanger, enable a fixing bolt of the heat exchanger to pass through a bolt hole on the lifting device, and use a nut to fixedly connect the two. Connect a top of the lifting device to a hoisting device, pull the heat exchanger out of the casing, and then hoist it to a leakage measurement station of a pressure test cylinder. Use a pressing member to fixedly connect and squeeze the pressure test cylinder to make the heat exchanger hermetically connected to both a top and a bottom of the pressure test cylinder.

[0018] The present invention has achieved the following technical effects compared with the prior art:

[0019] The present invention provides a leakage judgment device for a centrifugal compression heat exchanger. The design of the lifting tool makes the lifting process of the heat exchanger more stable and reliable. By cooperating with the fixing bolts of the heat exchanger through the bolt holes, it can effectively prevent the separation of the heat exchanger and the lifting tool during the lifting process, ensuring the safety of lifting. Moreover, it is convenient to connect with the lifting equipment, improving the working efficiency of heat exchanger lifting. The arrangement of the water injection hole and the drain hole facilitates the filling and draining operations of the pressure test cylinder, so that the leakage detection of the heat exchanger placed at the leakage measurement station can be carried out smoothly. It provides the basic hardware conditions for the entire leakage judgment process, ensuring the effective progress of the detection work. The setting of the first valve can accurately control the water injection process, controlling the water injection volume and injection speed, ensuring that water can be accurately injected into the pressure test cylinder according to requirements during the pressure test, providing convenience and precise control for the pressure test operation. The second valve can effectively control the drainage process. After the pressure test is completed, the water in the pressure test cylinder can be discharged in a timely and accurate manner, and the drainage speed can be controlled according to needs, facilitating subsequent work and operations such as cleaning the pressure test cylinder. The detachable connection method is convenient for quick assembly and disassembly when the heat exchanger needs to be detected and maintained. It can effectively seal the pressure test cylinder and the heat exchanger, preventing water leakage during the pressure test, ensuring the accuracy of the pressure test results, and thus improving the reliability of the entire detection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0021] Figure 1 It is a schematic structural diagram of the lifting tool in the leakage judgment device for a centrifugal compression heat exchanger provided by the present invention;

[0022] Figure 2 It is a schematic structural diagram of the pressure test cylinder in the leakage judgment device for a centrifugal compression heat exchanger provided by the present invention;

[0023] Figure 3 It is a schematic structural diagram of the heat exchanger placed in the pressure test cylinder in the leakage judgment device for a centrifugal compression heat exchanger provided by the present invention;

[0024] Figure 4 It is a schematic structural diagram of the heat exchanger;

[0025] In the figure: 1. Lifting tool; 2. Bolt hole; 3. Pressure test cylinder; 4. Water injection hole; 5. Drain hole; 6. First fluororubber gasket; 7. Second fluororubber gasket; 8. Pressing plate; 9. Locking bolt; 10. Locking nut; 11. Connecting plate; 12. Hoisting ring; 13. Heat exchanger. Detailed implementation manners

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0027] The purpose of the present invention is to provide a leakage judgment device for a centrifugal compression heat exchanger, so as to solve the problems existing in the above-mentioned prior art, with a simple structure, convenient to use, effectively avoiding subsequent rework operations, and effectively improving work efficiency.

[0028] In order to make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation manners.

[0029] The present invention provides a leakage judgment device and a usage method for a centrifugal compression heat exchanger, as Figures 1 to 4As shown in the figure, it includes: a lifting tool 1, a pressure test cylinder 3, a first valve, a second valve and a pressing member. The lifting tool 1 is provided with a plurality of bolt holes 2, and the bolt holes 2 are used for the fixing bolts at the top of the heat exchanger 13 to pass through so that the lifting tool 1 fixes the heat exchanger 13. The top of the lifting tool 1 is used to connect with the hoisting equipment; on the side wall of the pressure test cylinder 3, a water injection hole 4 and a drain hole 5 are provided, and a leakage measurement station is formed inside the pressure test cylinder 3. The leakage measurement station is used to place the heat exchanger 13; the first valve is arranged at the water injection hole 4; the second valve is arranged at the drain hole 5; the pressing member is used to be detachably and fixedly connected to the top of the pressure test cylinder 3 and press the heat exchanger 13 so that both the top and the bottom of the pressure test cylinder 3 are hermetically connected to the heat exchanger 13; the design of the lifting tool 1 makes the hoisting process of the heat exchanger 13 more stable and reliable. By cooperating with the fixing bolts of the heat exchanger 13 through the bolt holes 2, it can effectively prevent the heat exchanger 13 from separating from the lifting tool 1 during the hoisting process, ensuring the safety of hoisting. Moreover, it is convenient to connect with the hoisting equipment, improving the working efficiency of hoisting the heat exchanger 13. The settings of the water injection hole 4 and the drain hole 5 facilitate the water filling and draining operations of the pressure test cylinder 3, so that the leakage detection of the heat exchanger 13 placed in the leakage measurement station can be carried out smoothly. It provides the basic hardware conditions for the whole leakage judgment process, ensuring the effective progress of the detection work. The setting of the first valve can accurately control the water injection process, control the water injection volume and injection speed, ensuring that water can be accurately injected into the pressure test cylinder 3 according to the requirements during the pressure test, providing convenience and precise control for the pressure test operation. The second valve can effectively control the drainage process. After the pressure test is completed, the water in the pressure test cylinder 3 can be drained in a timely and accurate manner, and the drainage speed can be controlled according to the needs, facilitating the subsequent work and the cleaning operation of the pressure test cylinder 3. The detachable connection method is convenient for quick assembly and disassembly when the heat exchanger 13 needs to be detected and maintained. It can effectively seal the pressure test cylinder 3 and the heat exchanger 13, prevent water leakage during the pressure test, ensure the accuracy of the pressure test result, and thus improve the reliability of the whole detection device.

[0030] In a preferred embodiment, the drain port is arranged above the water injection port. By arranging the drain port above the water injection port, when injecting water into the pressure test cylinder 3, the water can flow in from the water injection port and naturally fill the lower space of the pressure test cylinder 3, which is beneficial to the smooth discharge of air from the drain port above, avoiding excessive gas mixing in the water and affecting the pressure test effect. When draining water, the water can flow out naturally under the action of its own gravity, and the drainage process is relatively smooth. At the same time, the water in the pressure test cylinder 3 can be drained more thoroughly, facilitating the subsequent treatment of the pressure test cylinder 3 and the heat exchanger 13 after the pressure test.

[0031] In a preferred embodiment, a first ring plate is provided inside the bottom edge of the pressure test cylinder 3. The first ring plate is used for sealingly abutting against the bottom of the heat exchanger 13. The setting of the first ring plate further enhances the sealing effect between the bottom of the pressure test cylinder 3 and the bottom of the heat exchanger 13, reduces the possibility of water leakage from the bottom during the pressure test, helps to improve the accuracy of the pressure test result, and enhances the reliability of the detection device.

[0032] In a preferred embodiment, a first fluororubber gasket 6 is further included. The first fluororubber gasket 6 is arranged on the top surface of the first ring plate to sealingly abut against the bottom of the heat exchanger 13. The first fluororubber gasket 6 has good sealing performance and corrosion resistance, can better fill the gap between the pressure test cylinder 3 and the bottom of the heat exchanger 13, further improve the sealing effect, and at the same time can effectively resist the possible chemical corrosion during the pressure test, and extend the service life of the device.

[0033] In a preferred embodiment, a second ring plate is provided outside the top edge of the pressure test cylinder 3. The second ring plate is used for sealingly abutting against the top edge of the heat exchanger 13. The setting of the second ring plate provides structural support for the sealing between the top of the pressure test cylinder 3 and the top of the heat exchanger 13, can effectively limit the position of the heat exchanger 13, ensure the stability of the sealing, reduce the risk of water leakage at the top during the pressure test, and improve the accuracy and reliability of the detection.

[0034] In a preferred embodiment, a second fluororubber gasket 7 is further included. The second fluororubber gasket 7 is arranged on the top surface of the second ring plate to sealingly abut against the top edge of the heat exchanger 13. The second fluororubber gasket 7 can provide a more reliable sealing barrier between the top of the pressure test cylinder 3 and the heat exchanger 13, make up for the possible gap by using its characteristics, further improve the top sealing effect, ensure the sealing performance during the pressure test, and enhance the overall performance of the device.

[0035] In a preferred embodiment, the pressing member includes a plurality of pressing plates 8, a plurality of locking bolts 9 and a plurality of locking nuts 10. A first through hole is provided at the first end of the pressing plate 8. A plurality of connecting plates 11 are provided outside the first ring plate. The connecting plate 11 is provided with a second through hole. The locking bolt 9 is used to pass through the first through hole and the second through hole and be threadedly connected with the locking nut 10 so that the second end of the pressing plate 8 is used to press against the top of the heat exchanger 13, making the pressing operation more firm and reliable. The pressing force of the pressing plate 8 on the heat exchanger 13 can be controlled by adjusting the locking bolt 9 and the nut. Moreover, the structure is simple, convenient for operation and maintenance, and is beneficial to ensuring the stability and sealing performance of the heat exchanger 13 during the pressure test.

[0036] In a preferred embodiment, the connecting plates 11 are evenly arranged along the circumference of the second ring plate. The evenly arranged connecting plates 11 can ensure that the pressure of the pressure plate 8 on the top of the heat exchanger 13 is evenly distributed, thereby preventing the occurrence of poor sealing due to local uneven pressure, improving the reliability of the sealing, and ensuring that the pressure test process is more stable and reliable.

[0037] In a preferred embodiment, the number of connecting plates 11 is 16, and the number of pressing plates 8 is not less than 8. The number of connecting plates 11 and pressing plates 8 set reasonably can ensure effective compression and sealing of the heat exchanger 13 while avoiding problems such as complex structure and inconvenient operation caused by too many connecting plates 11 and pressing plates 8. 16 connecting plates 11 and not less than 8 pressing plates 8 can achieve good stability and sealing effects, and improve the practicality and effectiveness of the device.

[0038] In a preferred embodiment, the sling 1 is a third ring plate. The third ring plate as the sling 1 has a simple structure and high strength, can effectively bear the weight of the heat exchanger 13, and ensure the stability and safety of the lifting process. At the same time, this simple structural design is convenient in manufacturing, installation and maintenance.

[0039] In a preferred embodiment, it also includes a plurality of lifting rings 12, each of which is fixedly connected to the top of the third ring plate and is evenly arranged along the circumference of the third ring plate. The plurality of evenly arranged lifting rings 12 facilitate the connection with the lifting equipment and can make the heat exchanger 13 evenly stressed during the lifting process, thereby ensuring that the lifting process is smoother and safer, avoiding damage to the heat exchanger 13 due to uneven stress, and improving the quality of the lifting operation.

[0040] The method for using the centrifugal compression heat exchanger leakage judgment device provided by the present invention is as follows: first, install the sling 1 on the heat exchanger 13, pass the fixing bolts of the heat exchanger 13 through the bolt holes 2 on the sling 1, and use nuts to fix the two together, then hang the wire rope on the lifting ring 12 for lifting, pull the heat exchanger 13 out of the casing, and then lift it in the pressure test cylinder 3. The pressure test cylinder 3 is placed at a certain height from the ground and the bottom of the heat exchanger 13 can be observed and cleared. Before installation, check whether the first fluororubber pad 6 and the second fluororubber pad 7 are damaged. If damaged, replace them with new pads in time. After installing into the pressure test cylinder 3, first remove the sling 1, and then press the second ends of the eight pressure plates 8 on the edge of the heat exchanger 13. The first end is connected to the connecting plate 11 through the M16 or M18 locking bolts 9. The eight pressure plates 8 are evenly distributed, and then the locking bolts 9 are evenly tightened.

[0041] Install the first valve at the water injection hole 4 and the second valve at the drain hole 5. Open the second valve and the first valve, then connect the water inlet to the water pressure pump to fill and pressurize with water. Keep the second valve at the drain outlet open for exhaust. When water flows out of the drain outlet, the heat exchanger 13 is filled with water. Then close the second valve at the drain outlet and continue to inject water through the water pressure pump from the water injection hole 4 to increase the pressure. If water leaks at the positions of the first fluororubber gasket 6 and the second fluororubber gasket 7 during the pressure increase process, the locking bolts 9 need to be further tightened. If there is still leakage, a pressure plate 8 needs to be added to the connecting plate 11 at the leakage position to ensure its sealing. Increase the pressure to 0.4 MPa and keep the pressure for 20 minutes. If the pressure does not drop, it proves that the heat exchanger 13 has no leakage. Drain the water through the drain hole 5, remove the pressure plate 8, use the lifting tool 1 to lift out the heat exchanger 13, and then reinstall it into the housing.

[0042] In the present invention, specific examples are used to illustrate the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A leakage judgment device for a centrifugal compression heat exchanger, characterized in that: Including: A sling, the sling is provided with a plurality of bolt holes, and the bolt holes are used for fixing bolts at the top of the heat exchanger to pass through so that the sling fixes the heat exchanger, and the top of the sling is used for connecting with a hoisting device; A pressure test cylinder, a water injection hole and a drain hole are arranged on the side wall of the pressure test cylinder, and a leakage measurement station is formed in the pressure test cylinder, and the leakage measurement station is used for placing a heat exchanger; A first valve, the first valve is arranged at the water injection hole; A second valve, the second valve is arranged at the drain hole; A pressing member, the pressing member is used for detachably and fixedly connecting with the top of the pressure test cylinder and pressing the heat exchanger so that both the top and the bottom of the pressure test cylinder are hermetically connected with the heat exchanger.

2. The centrifugal compression heat exchanger leakage judgment device according to claim 1, characterized in that: A first ring plate is arranged on the inner side of the bottom edge of the pressure test cylinder, and the first ring plate is used for hermetically abutting against the bottom of the heat exchanger.

3. The centrifugal compression heat exchanger leakage judgment device according to claim 2, characterized in that: A first fluororubber gasket is further included, and the first fluororubber gasket is arranged on the top surface of the first ring plate to hermetically abut against the bottom of the heat exchanger.

4. The centrifugal compression heat exchanger leakage judgment device according to claim 3, characterized in that: A second ring plate is arranged on the outer side of the top edge of the pressure test cylinder, and the second ring plate is used for hermetically abutting against the top edge of the heat exchanger.

5. The centrifugal compression heat exchanger leakage judgment device according to claim 4, characterized in that: A second fluororubber gasket is further included, and the second fluororubber gasket is used for being arranged on the top surface of the second ring plate to hermetically abut against the top edge of the heat exchanger.

6. The centrifugal compression heat exchanger leakage judgment device according to claim 5, characterized in that: The pressing member includes a plurality of pressing plates, a plurality of locking bolts and a plurality of locking nuts. A first through hole is arranged at the first end of the pressing plate, a plurality of connecting plates are arranged on the outer side of the first ring plate, a second through hole is arranged on the connecting plate, and the locking bolt is used for passing through the first through hole and the second through hole and being threadedly connected with the locking nut so that the second end of the pressing plate is used for pressing on the top of the heat exchanger.

7. The centrifugal compression heat exchanger leakage judgment device according to claim 6, characterized in that: The connecting plates are uniformly arranged along the circumferential direction of the second ring plate.

8. The centrifugal compression heat exchanger leakage judgment device according to claim 7, characterized in that: The number of the connecting plates is 16, and the number of the pressing plates is not less than 8.

9. The centrifugal compression heat exchanger leakage judgment device according to claim 1, characterized in that: A plurality of lifting rings are further included, and the sling is a third ring plate. Each of the lifting rings is fixedly connected to the top of the third ring plate and is uniformly arranged along the circumferential direction of the third ring plate.

10. A method for using the centrifugal compression heat exchanger leakage judgment device according to any one of claims 1 to 9, characterized in that: Including the following steps: Install the sling on the heat exchanger, make the fixing bolts of the heat exchanger pass through the bolt holes on the sling, use nuts to fixedly connect the two, connect the top of the sling with the hoisting device, pull the heat exchanger out of the casing, and then hoist it into the leakage measurement station of the pressure test cylinder, and use the pressing member to fixedly connect and squeeze the heat exchanger so that the heat exchanger is hermetically connected with the top and the bottom of the pressure test cylinder.

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