Pressure test tooling and method for testing cryogenic liquid cargo containment tanks

Abstract

The application discloses a pressure test tool and a test method for testing a low-temperature liquid cargo sealed tank, and relates to the technical field of pressure test equipment. The tool comprises a pressure-bearing shell, an end support mechanism and a detection structure. The pressure-bearing shell is internally formed with a test cavity for containing a test medium, and both ends of the pressure-bearing shell are provided with openings which are sealed by corrugated plates. Heat insulation modules are arranged on the sides of the corrugated plates away from the test cavity. The end support mechanism is connected with the pressure-bearing shell and supports the corrugated plates and the heat insulation modules. The detection structure is connected with the corrugated plates. Through holes are formed in the heat insulation modules and the end support mechanism. The detection structure extends out of the end support mechanism after passing through the through holes in the heat insulation modules and the end support mechanism, so that the detection condition of the corrugated plates can be reflected by the change of the detection structure. The structure realizes accurate pressure test of the low-temperature liquid cargo sealed tank.

Description

Technical Field

[0001] This invention relates to the field of pressure testing equipment technology, and specifically to a pressure testing fixture and method for testing cryogenic liquid cargo sealed storage tanks. Background Technology

[0002] In the factory pressure testing of large pressure vessels, pipe fittings, and other test items, specialized pressure testing fixtures are typically required to simulate their operating conditions. These fixtures need to form a closed test chamber to accommodate the test item and the test medium, and withstand high-pressure loads. Existing pressure testing fixtures for some large cryogenic liquid cargo sealed storage tanks are insufficient for performing pressure tests and obtaining accurate measurements. Therefore, providing a pressure testing fixture capable of accurately and reliably testing cryogenic liquid cargo sealed storage tanks has become a technical problem that needs to be solved in this field. Summary of the Invention

[0003] The main objective of this application is to provide a pressure testing fixture for testing cryogenic liquid cargo sealed storage tanks, thereby solving the problem that existing pressure testing fixtures are difficult to reliably test when testing cryogenic liquid cargo sealed storage tanks, and realizing reliable testing of cryogenic liquid cargo sealed storage tanks.

[0004] According to the present invention, a pressure testing fixture for testing cryogenic liquid cargo sealed storage tanks is provided, which includes a pressure-bearing shell, an end support mechanism, and a testing structure.

[0005] The pressure-bearing shell has an internal test cavity for containing the test medium. The pressure-bearing shell has openings at both ends, which are sealed by corrugated plates. An insulation module is provided on the side of the corrugated plate away from the test cavity, and the insulation module supports the corrugated plate.

[0006] An end support mechanism, which is connected to the pressure-bearing shell and provides support for the corrugated plate and the insulation module; and...

[0007] The detection structure is adapted to be connected to the corrugated plate. The insulation module and the end support mechanism are provided with through holes. The detection structure passes through the through holes on the insulation module and the end support mechanism and extends out of the end support mechanism so as to reflect the pressure detection status of the corrugated plate by the change of the detection structure.

[0008] In one embodiment, the detection structure includes a deformation measuring metal rod.

[0009] In one embodiment, the deformation measuring metal rod has a measuring scale.

[0010] In one embodiment, a measuring instrument is provided on the end support mechanism, the measuring instrument being used to measure the displacement of the deformation measuring metal rod.

[0011] In one embodiment, the end support mechanism includes an end cap and a set of fasteners for pressing the end cap against the end of the pressure-bearing housing.

[0012] In one embodiment, the end cap has a reinforcing structure on the side opposite to the test chamber, the reinforcing structure including ribs radially distributed from the center of the end cap to the edge.

[0013] In one embodiment, the pressure testing fixture further includes a support mechanism disposed below the pressure-bearing housing for supporting the pressure-bearing housing. The support mechanism includes a saddle fixed to the bottom of the pressure-bearing housing and a base connected to the bottom of the saddle.

[0014] In one embodiment, the pressure-bearing housing is a horizontal cylindrical housing, and a lateral channel assembly is provided on the side wall of the pressure-bearing housing.

[0015] In one embodiment, the lateral channel assembly includes a channel opening on the side wall of the pressure housing, a manhole flange fixed at the channel opening, a blind plate detachably mounted on the manhole flange by fasteners, and test medium filling and discharging ports on the upper and lower parts of the side wall of the pressure housing.

[0016] In one embodiment, the fastener assembly includes a plurality of bolts and a support sleeve evenly distributed circumferentially.

[0017] In one embodiment, the support sleeve is supported between the mounting flange on the pressure-bearing housing and the end support mechanism, and the bolt is adapted to pass sequentially through the end support mechanism, the support sleeve, and the mounting flange.

[0018] This invention also provides a test method for a pressure testing fixture used to test cryogenic liquid cargo sealed storage tanks, comprising:

[0019] The detection structure is fixed to the corrugated plate;

[0020] The corrugated plate is fixed on the pressure-bearing housing and the opening of the pressure-bearing housing is sealed. The heat insulation module is fixed on the corrugated plate. The end support mechanism is fixed on the pressure-bearing housing to support the heat insulation module and the corrugated plate, and the detection structure extends outward from the end support mechanism.

[0021] Fill the pressure-bearing shell with the test medium;

[0022] Observe and detect changes in the structure.

[0023] In the pressure testing fixture for testing cryogenic liquid cargo sealed storage tanks as described in this invention, a pressure-bearing shell is used to contain the test medium, and the openings at both ends of the pressure-bearing shell are sealed by corrugated plates. An insulation module is provided on the side of the corrugated plate away from the test chamber, and an end support mechanism provides support. During the test, a detection structure connected to the corrugated plate reflects the pressure condition of the corrugated plate, thus achieving pressure testing of the corrugated plate. The sealed test chamber formed by the pressure-bearing shell provides a stable high-pressure testing environment for the corrugated plate, the end support mechanism reliably supports the corrugated plate and insulation module under test, and the detection structure accurately and reliably reflects the pressure condition of the corrugated plate, together achieving accurate and reliable pressure testing of cryogenic liquid cargo sealed storage tanks. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A front view of a pressure testing fixture for testing cryogenic liquid cargo sealed storage tanks according to an embodiment of the present invention is shown;

[0026] Figure 2 An isometric view of a pressure testing fixture for testing cryogenic liquid cargo sealed storage tanks according to an embodiment of the present invention is shown.

[0027] Figure 3 A half-sectional view of a pressure testing fixture for testing cryogenic liquid cargo sealed storage tanks according to an embodiment of the present invention is shown.

[0028] Figure 4 A schematic diagram of a corrugated plate and an insulation module according to an embodiment of the present invention is shown;

[0029] Figure 5 A schematic flowchart of a test method for a pressure testing fixture for testing cryogenic liquid cargo sealed storage tanks, according to an embodiment of the present invention, is shown.

[0030] In the diagram: 100, pressure-bearing shell; 101, test chamber; 102, mounting flange; 200, end support mechanism; 201, end cap; 202, fastener assembly; 204, stiffening plate; 205, measuring instrument; 300, support mechanism; 301, saddle; 302, base; 400, lateral passage assembly; 401, manhole flange; 402, blind flange; 403, test medium filling / discharging interface; 500, detection structure; 601, corrugated plate; 602, insulation module. Detailed Implementation

[0031] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0032] The pressure testing fixture provided by this invention for testing cryogenic liquid cargo sealed storage tanks is particularly suitable for conducting high-pressure strength and sealing tests on cryogenic liquid cargo sealed storage tanks for liquefied natural gas (LNG) before they leave the factory. These tests typically require simulating extremely low temperatures and high internal pressures, placing extremely high demands on the fixture's pressure-bearing capacity, sealing reliability, and overall stability. The horizontal design of the fixture effectively lowers the overall center of gravity, improving the safety of the testing process.

[0033] Please see Figures 1 to 4 An embodiment of the present invention provides a pressure testing fixture for testing cryogenic liquid cargo sealed storage tanks. The pressure testing fixture includes a pressure-bearing shell 100, an end support mechanism 200, and a detection structure 500.

[0034] The pressure-bearing housing 100 has a test chamber 101 inside for containing the test medium. The pressure-bearing housing 100 has openings at both ends, which are sealed by a corrugated plate 601. An insulation module 602 is provided on the side of the corrugated plate 601 away from the test chamber. The end support mechanism 200 is connected to the pressure-bearing housing 100 and provides support for the corrugated plate 601 and the insulation module 602. The detection structure 500 is adapted to be connected to the corrugated plate 601. The insulation module 602 and the end support mechanism 200 have through holes. The detection structure 500 passes through the through holes on the insulation module 602 and the end support mechanism 200 and extends out of the end support mechanism 200 so that the detection status of the corrugated plate 601 can be reflected by the changes in the detection structure 500.

[0035] The pressure-bearing shell 100 is the main structure of the tooling, and its interior forms a sealed test chamber 101 for containing the test medium (such as water, nitrogen, or helium). By injecting a high-pressure medium into the test chamber 101, the design pressure or even a higher multiple of the test pressure can be applied to the corrugated plates 601 at both ends, thereby verifying their structural strength and sealing performance. As the pressure-bearing main body of the entire tooling, the structural strength of the pressure-bearing shell 100 directly determines the safety upper limit of the tooling.

[0036] A heat insulation module 602 is installed on the side of the corrugated plate 601 away from the test chamber to simulate the tank wall structure of a real cryogenic liquid cargo sealed storage tank. Please refer to Figure 4 The figure shows a corrugated plate 601 and an insulation module 602 located at the two end openings of the pressure housing 100. In the figure, the corrugated plate 601 is located on the side facing the test chamber 101 and seals the two end openings of the pressure housing 100, while the insulation module 602 is located on the side away from the test chamber 101 and is connected to the corrugated plate 601.

[0037] To provide support for the corrugated plates 601 and insulation modules 602 at both ends of the pressure-bearing housing 100, an end support mechanism 200 is provided on the pressure-bearing housing 100. For example, the end support mechanism 200 is connected to the openings at both ends of the pressure-bearing housing 100. The core function of this mechanism is to share the high pressure of the test medium and provide strength support for the corrugated plates 601 and insulation modules 602, which is crucial to ensuring the validity of the test and on-site safety.

[0038] To allow external observation of the pressure-bearing condition of the corrugated plate 601, a detection structure 500 is connected to the corrugated plate 601 and extends beyond the end support mechanism 200. Changes in the detection structure 500 are then used to determine the condition of the corrugated plate 601. For example, the insulation module 602 and the end support mechanism 200 have through holes, and the detection structure 500 passes through these through holes and extends beyond the end support mechanism 200.

[0039] In some embodiments, the detection structure 500 includes a deformation measuring metal rod.

[0040] In one embodiment, the deformation measuring metal rod has a measuring scale, such as a length measuring scale. By reading the length change of the deformation measuring metal rod, the pressure or deformation of the corrugated plate 601 can be obtained. In another embodiment, a measuring instrument 205 is provided on the end support mechanism 200. This measuring instrument 205 is used to measure the displacement of the deformation measuring metal rod, for example, a dial indicator. Furthermore, the measuring instrument 205 provided on the end support mechanism 200 can also be a measuring instrument that directly displays the pressure value of the corrugated plate 601, etc., and this application does not impose any limitations on this.

[0041] Please see Figure 2 and Figure 3 The end support mechanism 200 includes an end cap 201 and a fastener assembly 202 for pressing the end cap 201 against the end of the pressure housing 100.

[0042] Specifically, the end of the pressure-bearing housing 100 is typically welded with a high-pressure butt-welded mounting flange 102. The end cap 201 is a disc-shaped or dish-shaped head structure that matches the mounting flange 102. Fastener sets 202, such as multiple sets of high-strength bolts and nuts, pass circumferentially through bolt holes on the mounting flange 102 and the end cap 201. By using tools such as hydraulic wrenches to pre-tighten these bolts diagonally, stepwise, and evenly, the enormous bolt force presses the end cap 201 against the mounting flange 102. This split-flange bolt connection structure allows for quick disassembly and installation of the end cap 201, greatly facilitating the insertion and removal of the corrugated plate 601 and improving testing efficiency.

[0043] Furthermore, a reinforcing structure is provided on the side of the end cap 201 facing away from the test chamber 101. When the test chamber 101 is filled with high-pressure medium, the medium pressure will act evenly on the end cap 201, generating a huge load that attempts to push the end cap 201 outward from the shell. This load will cause outward bending deformation in the central area of ​​the end cap 201. If the rigidity of the end cap 201 is insufficient, excessive deformation will not only increase the additional stress on the bolts, but more importantly, it will cause relative displacement or warping of the sealing surface, destroying the integrity of the seal and causing leakage. The purpose of setting the reinforcing structure is to significantly improve the rigidity of the end cap 201, suppress its deformation under high pressure, thereby ensuring the flatness and fit of the sealing surface, and ensuring the long-term reliability of the high-pressure seal.

[0044] Please see Figure 2 In this embodiment, the reinforcing structure includes ribs 204 radially distributed from the center of the end cap 201 to its edges. These ribs 204, like spokes extending from the hub to the rim, efficiently transfer and distribute the concentrated load borne by the central region of the end cap 201 to the edges of the end cap 201 and the root connecting to the mounting flange 102. The radial distribution is a mechanically sound arrangement, allowing the ribs 204 to primarily bear tensile and compressive stresses, thus utilizing the material most effectively to resist bending deformation. By setting these radial ribs 204, the bending stiffness and deformation resistance of the end cap 201 can be significantly improved without substantially increasing its overall thickness and weight. This means that a relatively thinner and lighter end cap body plate can be used, reinforced by ribs, achieving the required structural strength while saving materials, reducing manufacturing costs, and simplifying installation. Compared to simply increasing the end cap thickness, this "ribbed" reinforcement method has significant advantages in improving performance and controlling costs and weight.

[0045] Besides radial stiffeners, other forms of reinforcement can also be used, such as annular stiffeners, grid-like stiffeners, or dished or elliptical heads on the outer surface of the end cap 201, which inherently possess good load-bearing shapes. Compared to grid stiffeners, radial stiffeners offer a more direct stress transfer path, provide more significant support to the central area, and are easier to cast or weld. Furthermore, compared to a simple thick flat end cap, they offer advantages in terms of lightweighting and deformation resistance. The specific reinforcement method chosen can be determined comprehensively based on factors such as the end cap's diameter, test pressure, materials, and manufacturing process.

[0046] Please see Figure 3 In this embodiment, the fastener group 202 includes a plurality of bolts and support sleeves evenly distributed circumferentially.

[0047] Preferably, the support sleeve is provided between the mounting flange 102 on the pressure-bearing housing 100 and the end support mechanism 200, and the bolts are adapted to pass through the end support mechanism 200, the support sleeve and the mounting flange 102 in sequence.

[0048] Evenly distributed bolts ensure that the bolt preload is evenly transmitted across the entire circumference, avoiding a "seesaw" effect where some areas experience excessive pressure while others lack sufficient pressure. Uniform tightening force is a prerequisite for ensuring uniform compression and forming a continuous and complete support ring. Typically, the number and specifications (diameter, strength grade) of bolts are determined based on the support diameter and design pressure, and assembly is performed using a symmetrical, step-by-step tightening method to achieve optimal support. Besides bolts, other components capable of providing continuous tightening force, such as quick-release clamps, can be used in some cases for fastener assemblies. However, bolted connections are most widely used in high-pressure, large-scale tooling due to their high reliability, mature technology, and high load-bearing capacity.

[0049] The support sleeve can support between the mounting flange 102 and the end cap 201 of the end support mechanism 200. On the one hand, the support sleeve bears the compressive force and controls the tension of the bolt within a safe range, avoiding overload. On the other hand, the support sleeve precisely controls the distance between the mounting flange 102 and the end support mechanism 200.

[0050] Please see Figures 1 to 3The pressure vessel shell 100 is preferably a horizontal cylindrical shell. Compared to a vertical arrangement, the horizontal arrangement has a lower center of gravity and better stability when bearing the same weight. The cylindrical structure provides the most uniform stress distribution and the highest material utilization rate when subjected to internal pressure, making it the most classic and efficient structural form for pressure vessels. Furthermore, the cylindrical shell facilitates connection and manufacturing with standardized flanges, saddles, and other components, offering good manufacturability and economy. This shell is typically made of high-strength pressure vessel steel plates rolled and welded. Its wall thickness is determined through rigorous calculations based on the maximum test pressure, shell diameter, and allowable material stress to ensure absolute safety under extreme test conditions.

[0051] To fundamentally address the stability issues such as swaying and displacement that may occur in large-scale fixtures during high-pressure testing, this embodiment includes a dedicated support mechanism 300 beneath the pressure-bearing housing 100. This support mechanism 300 is not a simple support leg, but a mechanically designed and robust support structure that firmly supports the pressure-bearing housing 100 and its internal load (including the corrugated plate 601, the insulation module 602, and the test medium). This ensures that the fixture remains horizontally stable throughout the entire pressurization, pressure holding, and pressure release process, without tilting or slipping. This stable posture guarantees uniform stress distribution across the pressure-bearing housing 100, avoiding the risk of seal failure due to localized stress concentration. It also provides a stable measurement reference for precision instruments (such as pressure sensors) mounted on the fixture, thereby significantly improving the accuracy and repeatability of test data and eliminating safety hazards caused by fixture instability.

[0052] In this embodiment, the support mechanism 300 includes a saddle 301 fixed to the bottom of the pressure-bearing housing 100 and a base 302 connected to the bottom of the saddle 301.

[0053] The saddle 301 is an arc-shaped or semi-enclosed support adapted to the cylindrical shell shape, usually two in number, symmetrically arranged at the bottom of the shell. The saddle 301 is securely fixed to the outer wall of the pressure-bearing shell 100 by welding or high-strength bolts, forming a rigid connection with the shell, thereby effectively transferring the weight of the shell and internal loads to the support. The base 302 is a flat plate or frame structure installed below the saddle 301, with a large contact area at its bottom, allowing it to be placed directly on the ground or foundation. The base 302 typically has anchor bolt holes, which can be used to fix it to the foundation, preventing slippage of the fixture during testing. The combination of the saddle 301 and the base 302 constitutes a stable support system. The saddle is responsible for bearing and distributing the concentrated load from the shell, while the base provides a stable base and a reliable connection to the ground. This support method effectively resists overturning moments and horizontal forces that may be caused by fluctuations in medium pressure, pipeline connections, or external interference during the test, ensuring that the entire pressure testing fixture is as stable and reliable as a whole. This is the foundation for achieving high-precision and high-safety pressure testing. For ultra-large fixtures, the base 302 can also integrate a leveling mechanism (such as adjusting shims or adjusting bolts) to precisely adjust the level of the pressure-bearing housing 100 during installation.

[0054] In this embodiment, a lateral channel assembly 400 is provided on the side wall of the pressure-bearing housing 100. The lateral channel assembly 400 provides a convenient interface for operations such as filling and discharging the test medium and installing the corrugated plate 601, without having to open too many process holes on the main body of the pressure-bearing housing 100, thereby simplifying the housing structure and reducing potential weak points.

[0055] Furthermore, the lateral channel assembly 400 includes a channel opening on the side wall of the pressure housing 100, a manhole flange 401 fixed at the channel opening, a blind plate 402 detachably mounted on the manhole flange 401 by fasteners (such as bolts), and test medium filling and discharging ports 403 opened on the upper and lower parts of the side wall of the pressure housing.

[0056] Manhole flange 401 is a standard or custom high-pressure flange, welded to the access port on the side wall of the housing. Its size is large enough to allow personnel to enter the test chamber 101 for installation, positioning, internal inspection, or maintenance of the corrugated plate 601. During testing, the blind flange 402 is bolted to the manhole flange 401 to achieve a seal.

[0057] The test medium filling / discharging interface 403 can be a threaded interface, a flange interface, or a quick coupling, used to connect external pipelines and / or equipment such as high-pressure water pumps and nitrogen cylinders. It allows the test medium, such as water or nitrogen, to be filled into the test chamber 101 during the test and to be discharged after the test. Preferably, the corrugated plate 601 is tested under a test medium pressure of 2 MPa.

[0058] In addition, the lateral channel assembly 400 may also be provided with interfaces for connecting external pipelines and equipment such as pressure gauges, pressure sensors, safety valves or pressure relief valves, and this application does not impose any restrictions on this.

[0059] In addition to serving as a manhole and general-purpose interface, the lateral access assembly 400 can also be designed in other forms to meet specific needs. For example, it can be a threaded hole seat specifically for mounting ultra-high pressure sensors, opened at a specific location on the housing (such as the top or end), or a flange interface for mounting an observation window. The manhole design is most commonly used in general-purpose test fixtures that require frequent replacement of the corrugated plate 601 or internal inspection due to its versatility and ease of internal operation.

[0060] This invention also provides a testing method for a pressure testing fixture used to test cryogenic liquid cargo sealed storage tanks. This method is based on the aforementioned pressure testing fixture for testing cryogenic liquid cargo sealed storage tanks. The method includes the following steps:

[0061] S1: Fix the detection structure 500 onto the corrugated plate 601;

[0062] The connecting end of the detection structure 500 is fixedly assembled to the predetermined position of the corrugated plate 601. For example, if the detection structure 500 is a deformation measuring metal rod, the deformation measuring metal rod is fixed to the corrugated plate 601 to be tested. Fixing methods include bonding, bolting, welding, and snap-fitting, ensuring that there is no relative slippage or loosening between the detection structure 500 and the corrugated plate 601 during subsequent low-temperature and high-pressure tests, thus guaranteeing the continuity and accuracy of the detection signal transmission.

[0063] S2: Fix the corrugated plate 601 to the pressure housing 100 and seal the opening of the pressure housing 100, fix the heat insulation module 602 to the corrugated plate 601, fix the end support mechanism 200 to the pressure housing 100 to support the heat insulation module 602 and the corrugated plate 601, and make the detection structure 500 extend outward from the end support mechanism 200.

[0064] The corrugated plate 601, which is equipped with the detection structure 500, is fixed to the pressure-bearing housing 100. The corrugated plate 601 is connected to the openings at both ends of the pressure-bearing housing 100, and the openings at both ends of the pressure-bearing housing 100 are sealed. Furthermore, the heat insulation module 602 is connected to the corrugated plate 601.

[0065] Next, the end support mechanism 200 is fixed to the pressure housing 100 to support the insulation module 602 and the corrugated plate 601. For example, the end cap 201 of the end support mechanism 200 is aligned with the mounting flange 102 at the port of the pressure housing 100, and high-strength bolts are passed through the bolt holes on the end cap 201 and the mounting flange 102 and tightened.

[0066] In order to obtain the pressure detection status of the corrugated plate 601 from the outside, the detection structure 500 extends outward from the end support mechanism 200. For example, the end cap 201 of the insulation module 602 and the end support mechanism 200 are provided with holes for the detection structure 500 to extend outward, so that the detection structure 500 extends outward from the end support mechanism 200.

[0067] S3: Fill the pressure-bearing shell 100 with the test medium;

[0068] Test media, such as water, nitrogen, helium, etc., are filled into the test chamber 101 of the pressure shell 100 through the pre-set test medium filling and discharging interface 403 on the pressure shell 100.

[0069] For example, the pressure of the test medium in test chamber 101 is set to 2 MPa during pressure testing.

[0070] S4: Observe the changes in the detection structure 500.

[0071] Observe the changes in the detection structure 500. For example, observe the changes using the measuring scale provided on the detection structure 500; or observe the condition of the corrugated plate 601 using the measuring instrument 205 provided on the end support mechanism 200 for measuring the displacement of the detection structure 500.

[0072] Analyze the observed changes (e.g., the displacement of the detection structure 500 or the pressure value of the corrugated plate 601) and obtain the pressure test results. If the change in the detection structure 500 exceeds the preset threshold or abruptly occurs, the sealing structure or pressure-bearing strength of the corrugated plate 601 is unqualified; if the change is within the elastic deformation range and there are no abnormal fluctuations, the test is deemed to have passed.

[0073] The orientations or spatial relationships used in this application, such as "top," "bottom," "left," "right," "inner," "outer," "lateral," "vertical," "longitudinal," "horizontal," and "sideways," are defined based on the perspective shown in the accompanying drawings. These expressions are intended only to simplify the description of the technical solutions of this invention and are not intended to imply or indicate that the elements referred to must be in a specific orientation or constructed and operated in a specific order. Therefore, the orientation terms mentioned herein should not be regarded as absolute limitations on the claims.

[0074] In the description of this application, terms such as "installation," "connection," "coupling," "fixing," "setting," and "equipped with" should be interpreted broadly. Specifically, a connection can be a fixed connection (such as welding or bolting), a detachable connection (such as flange bolting or snap-fit ​​connections), or even a structurally integral molding; it can refer to physical mechanical contact or functional association; furthermore, a connection includes both direct connection and indirect connection achieved through an intermediate medium. Those skilled in the art can determine the precise meaning of the above terms in this application based on the specific context and technical logic.

[0075] It should be clarified that the foregoing embodiments are merely representative examples of this application and do not constitute an exclusive definition of the scope of protection of this invention. For those skilled in the art, any conventional changes such as local optimizations, functional equivalent substitutions, or detailed modifications made without departing from the core concept of this application should be included within the scope of the claims of this application. For example, the pressure-bearing shell can also be arranged vertically under specific requirements; the support mechanism can use multiple sets of rolling supports to adapt to thermal expansion and contraction, but additional anti-movement devices are required; the end support mechanism can use faster clamp connections when the pressure is not high, etc. These variations based on the core concept of this invention all fall within the scope of protection of this invention.

Claims

1. A pressure testing fixture for testing cryogenic liquid cargo sealed storage tanks, characterized in that, include: A pressure-bearing shell has an internal test chamber for containing the test medium. The pressure-bearing shell has openings at both ends, which are sealed by corrugated plates. An insulation module is provided on the side of the corrugated plates away from the test chamber. An end support mechanism, which is connected to the pressure-bearing shell and provides support for the corrugated plate and the insulation module; and... The detection structure is connected to the corrugated plate. The insulation module and the end support mechanism are provided with through holes. The detection structure passes through the through holes on the insulation module and the end support mechanism and extends out of the end support mechanism so as to reflect the pressure detection status of the corrugated plate by the change of the detection structure.

2. The pressure testing fixture according to claim 1, characterized in that, The detection structure includes a deformation measuring metal rod.

3. The pressure testing fixture according to claim 2, characterized in that, The deformation measuring metal rod has a measuring scale.

4. The pressure testing fixture according to claim 2, characterized in that, The end support mechanism is equipped with a measuring instrument, which is used to measure the displacement of the deformation measuring metal rod.

5. The pressure testing fixture according to claim 1 or 2, characterized in that, The end support mechanism includes an end cap and a set of fasteners for pressing the end cap against the end of the pressure-bearing housing.

6. The pressure testing fixture according to claim 5, characterized in that, The end cap has a reinforcing structure on the side opposite to the test chamber, and the reinforcing structure includes ribs that radiate from the center of the end cap to the edge.

7. The pressure testing fixture according to claim 1 or 2, characterized in that, Also includes: A support mechanism is disposed below the pressure-bearing housing to support the pressure-bearing housing. The support mechanism includes a saddle fixed to the bottom of the pressure-bearing housing and a base connected to the bottom of the saddle.

8. The pressure testing fixture according to claim 1 or 2, characterized in that, The pressure-bearing shell is a horizontal cylindrical shell, and a lateral channel assembly is provided on the side wall of the pressure-bearing shell.

9. The pressure testing fixture according to claim 8, characterized in that, The lateral channel assembly includes a channel opening on the side wall of the pressure housing, a manhole flange fixed at the channel opening, a blind plate detachably mounted on the manhole flange by fasteners, and test medium filling and discharging ports on the upper and lower parts of the side wall of the pressure housing.

10. The pressure testing fixture according to claim 5, characterized in that, The fastener assembly includes a plurality of bolts and a support sleeve evenly distributed circumferentially.

11. The pressure testing fixture according to claim 10, characterized in that, The support sleeve is mounted on the pressure-bearing housing between the mounting flange and the end support mechanism, and the bolt is adapted to pass through the end support mechanism, the support sleeve and the mounting flange in sequence.

12. A test method for a pressure testing fixture for testing cryogenic liquid cargo sealed storage tanks as described in any one of claims 1-11, characterized in that, include: The detection structure is fixed to the corrugated plate; The corrugated plate is fixed on the pressure-bearing housing and the opening of the pressure-bearing housing is sealed. The heat insulation module is fixed on the corrugated plate. The end support mechanism is fixed on the pressure-bearing housing to support the heat insulation module and the corrugated plate, and the detection structure extends outward from the end support mechanism. Fill the pressure-bearing shell with the test medium; Observe and detect changes in the structure.

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