Wellhead lifting pup joint damage and leakage disposal device and installation method

Abstract

The invention relates to the technical field of gas wells, and particularly discloses a wellhead lifting pup joint damage and leakage disposal device and an installation method, and the wellhead lifting pup joint damage and leakage disposal device comprises an upper hoop assembly, a lower hoop assembly and a supporting hoop assembly which sleeve the outer side of a lifting pup joint and are sequentially connected from top to bottom; the upper sleeve is sleeved with the upper hoop assembly, the lower sleeve is sleeved with the lower hoop assembly, and the supporting sleeve is sleeved with the supporting sleeve. The invention further discloses an installation method of the device, the upper hoop assembly is arranged corresponding to the upper sleeve and the flange plate, the lower hoop assembly is arranged corresponding to the lower sleeve, and the supporting hoop assembly is arranged corresponding to the supporting sleeve. Therefore, the relative positions of the upper hoop assembly, the lower hoop assembly and the supporting hoop can be adjusted according to the specific conditions (different diameters or different axes) of the lifting pup joint. And meanwhile, the damaged part is always located in the annular closed cavity, and leakage is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas wells, and more particularly to a wellhead elevated short connection breakage external leakage treatment device and installation method. BACKGROUND

[0002] At present, some production and idle gas wells in oil and gas fields are at risk of leakage, fire and explosion due to the breakage of the elevated short connection (casing) on the ground. In view of the breakage and leakage of the elevated short connection (casing) on the ground, the breakage repair is usually carried out by means of circulating well killing at home and abroad, which has the problems of great difficulty, long cycle and high cost, and the production wells also face the state of long-term shutdown, which has a great impact on the enterprise benefit.

[0003] When the breakage occurs between the upper casing and the lower casing of the wellhead elevated short connection, in the case of breakage and leakage, in order to ensure the safety of the wellhead and the surrounding personnel and environment, a device capable of effectively protecting the casing and sealing the breakage position is needed. The material needs to have a certain strength and can withstand the load pressure brought by the upper wellhead device, and also needs to have the functions of sealing and pressure relief. After the pipeline is connected to the production process or the blowout pool, emergency pressure relief can be carried out, and a perfect well barrier can be re-established. The above-mentioned process construction method can solve the safety hazards caused by the elevated short connection leakage.

[0004] In the prior art, a clamp device is often integrally formed to overcome the above-mentioned problems, but it is found in the use process that the clamp device is suitable for sealing the breakage of the elevated short connection, but also has the following implementation difficulties:

[0005] The space of the square well is small in some stations, and the installation personnel cannot enter the restricted space to implement the installation operation; the distance between the horizontal plane of the square well and the four-way pipe of the wellhead casing head is short, and the installation of the clamp is difficult; at the same time, the restricted space brings adverse effects on the escape of flammable gas and personnel emergency escape;

[0006] The clamp device can effectively seal the coaxial elevated short connection (casing), but it cannot effectively fit and seal the elevated short connection with different diameters and non-coaxial;

[0007] Due to the small space of the square well and the serious eccentricity of the casing in some stations, the conventional installation process cannot be implemented, and corresponding measures need to be developed to ensure that the installation operation risk is controlled. SUMMARY

[0008] The technical problem to be solved by the present application is to provide a wellhead elevated short connection breakage external leakage treatment device and installation method, which can effectively prevent natural gas from leaking uncontrollably from the breakage between the upper casing and the lower casing with different diameters or non-coaxial;

[0009] The solution adopted by the present application to solve the technical problem is:

[0010] The wellhead lifting nipple breakage leakage treatment device, the lifting nipple comprises an upper sleeve, a lower sleeve and a support sleeve with diameters decreasing from top to bottom; an upper hoop assembly, a lower hoop assembly and a support hoop assembly are sequentially connected from top to bottom outside the lifting nipple; the upper hoop assembly is sleeved outside the upper sleeve, the lower hoop assembly is sleeved outside the lower sleeve, and the support sleeve is sleeved outside the support sleeve.

[0011] In some possible embodiments, the upper hoop assembly comprises two groups of upper semicircular hoops which are identical in structure and connected to each other; the two groups of upper semicircular hoops cooperate to form an upper cylindrical cavity, pressure relief holes and pressure taking holes are arranged on the upper semicircular hoops; a pressure relief pipeline is arranged on the pressure relief holes; a pressure gauge and a stop valve are arranged on the pressure taking holes.

[0012] In some possible embodiments, the upper semicircular hoop comprises an upper semicircular cylinder in a semicircular arc shape, and an upper connecting plate connected to the upper semicircular cylinder and in a semicircular ring shape; the two groups of upper semicircular cylinders cooperate to form an upper semicircular cavity, and the inner diameter of the upper semicircular cavity is consistent with the inner diameter of the upper connecting plate; the upper connecting plate is arranged on one side of the upper semicircular cylinder close to the lower hoop assembly and connected to the lower hoop assembly.

[0013] In some possible embodiments, the lower hoop assembly comprises two groups of lower semicircular hoops which are identical in structure and connected to each other;

[0014] The two groups of lower semicircular hoops cooperate to form a lower semicircular cavity in communication with the upper cylindrical cavity; the diameter of the upper cylindrical cavity is greater than the diameter of the lower cylindrical cavity.

[0015] In some possible embodiments, the lower semicircular hoop comprises a lower connecting plate connected to the upper connecting plate and in a semicircular ring shape, a lower semicircular cylinder connected to the lower connecting plate and in a semicircular arc shape, and a link plate identical in structure to the lower connecting plate and arranged at one end of the lower semicircular cylinder close to the support hoop assembly; the inner diameters of the lower connecting plate, the lower semicircular cylinder and the link plate are consistent.

[0016] In some possible embodiments, a plurality of upper connecting holes are arranged on the upper connecting plate, and the plurality of upper connecting holes are arranged along the circumference of the upper connecting plate; a lower connecting hole corresponding to the upper connecting hole is arranged on the lower connecting plate; a plurality of through holes are arranged on the link plate, and the plurality of through holes are uniformly arranged along the circumference of the link plate.

[0017] In some possible embodiments, the upper connecting plate and the lower connecting plate are sealingly connected, and the lower semicircular hoop and the lower sleeve are sealingly connected.

[0018] In some possible implementation manners, the support hoop assembly comprises two groups of half-circular hoops which are identical in structure and connected to each other; the two groups of half-circular hoops form a cylindrical clamping cavity.

[0019] In some possible implementation manners, the half-circular hoop comprises a clamping hoop in the shape of a half-circular arc, and a support plate in the shape of a half-circular ring arranged on one side of the clamping hoop close to the lower connecting plate; the two groups of clamping hoops form a cylindrical clamping cavity and are sleeved on the outside of the support sleeve, and the support plate is connected to the lower connecting plate through a support bolt.

[0020] A mounting method of the wellhead lifting nipple breakage leakage treatment device, comprising the following steps:

[0021] The support hoop assembly is sleeved on the outside of the support sleeve coaxially, and the support sleeve is clamped and fixed by the support hoop assembly;

[0022] The lower hoop assembly is mounted on the outside of the lower sleeve coaxially; the support bolt is mounted on the support hoop assembly to support and fix the lower hoop assembly;

[0023] A sealing rubber strip is arranged between the lower hoop assembly and the lower sleeve;

[0024] The upper hoop assembly is mounted on the outside of the upper sleeve and the flange plate on the top of the upper sleeve, and the upper hoop assembly is coaxially arranged with the flange plate;

[0025] The upper hoop assembly and the lower hoop assembly are connected and fixed, and sealing treatment is performed at the connecting bolt arranged on the flange plate, between the upper hoop assembly and the lower hoop assembly, between the outside of the flange plate and the inner side of the upper hoop assembly, so that the bottom of the flange plate, the outside of the upper sleeve, the inner side of the upper hoop assembly, and the top of the lower hoop form a ring-shaped closed chamber;

[0026] The pressure relief hole is arranged with a pressure relief pipeline, and a stop valve and a pressure gauge are arranged at the pressure tapping hole.

[0027] Compared with the prior art, the present application has the following beneficial effects:

[0028] In the present application, the upper hoop assembly is arranged corresponding to the upper sleeve and the flange plate, the lower hoop assembly is arranged corresponding to the lower sleeve, and the support hoop assembly is arranged corresponding to the support sleeve, so that the relative positions of the upper hoop assembly, the lower hoop assembly, and the support hoop can be adjusted according to the specific conditions (different diameters and different axes) of the lifting nipple; at the same time, the breakage is always located in the ring-shaped closed chamber, and leakage does not occur. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 The figure is a structural schematic diagram of the present application;

[0030] Figure 2 is a top view of the upper clamp assembly in the present application;

[0031] Figure 3 is a sectional view of the lower clamp assembly in the present application;

[0032] Figure 4 is a top view of the support clamp in the present application;

[0033] Figure 5 is a schematic view of the position relationship between the Christmas tree flange, the elevation short joint and the present application;

[0034] In the figure, 10 is a flange, 20 is an upper sleeve, 30 is a lower sleeve, 40 is a support sleeve, 1 is an upper clamp assembly, 11 is an upper half cylinder, 111 is a pressure relief hole, 112 is a pressure taking hole, 12 is an upper connecting plate, 121 is an upper connecting hole, 2 is a lower clamp assembly, 21 is a lower connecting plate, 22 is a lower half cylinder, 23 is a connecting plate, 231 is a through hole, 3 is a support clamp assembly, 31 is a clamping clamp, 32 is a support plate, and 4 is a support bolt. DETAILED DESCRIPTION

[0035] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or can be integrated; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. The "first", "second" and similar words mentioned in the present application do not represent any order, quantity or importance, but only distinguish different components. Similarly, "one" or "a" and the like do not represent a quantity limit, but represent the existence of at least one. In the implementation of the present application, the association relationship of the associated objects is described as "and / or", which means that there can be three relationships, for example, A and / or B can represent the following three cases: A exists alone, A and B exist together, and B exists alone. In the description of the embodiments of the present application, unless otherwise specified, the meaning of "multiple" is two or more. For example, multiple positioning columns refer to two or more positioning columns. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] The present application will be described in detail below.

[0037] As Figures 1-5 shown:

[0038] The application relates to a device for treating a damaged outer leakage of a wellhead lifting nipple, wherein the lifting nipple comprises an upper sleeve (20), a lower sleeve (30) and a supporting sleeve (40) with diameters decreasing from top to bottom; the device comprises an upper hoop assembly (1), a lower hoop assembly (2) and a supporting hoop assembly (3) which are sequentially connected from top to bottom and sleeved outside the lifting nipple; the upper hoop assembly (1) is sleeved outside the upper sleeve (20) and the flange (10) and connected with the lower hoop assembly (2) at the bottom;

[0039] It is to be noted that the flange (10) of the gas production tree is installed on the upper sleeve (20) and communicates with the upper sleeve (20); the upper hoop assembly (1) is sleeved outside the upper sleeve (20) and the flange (10) and connected with the lower hoop assembly (2) at the bottom;

[0040] The lower hoop assembly (2) is sleeved outside the lower sleeve (30) and connected with the bottom of the upper hoop assembly (1) at the top;

[0041] The supporting hoop assembly (3) is sleeved outside the supporting sleeve (40) and used for supporting and fixing the lower hoop assembly (2) at the top;

[0042] An annular closed chamber is formed among the inner side of the upper hoop assembly (1), the bottom of the flange (10), the top of the lower hoop assembly (2) and the outside of the upper sleeve (20), and the damaged part is located in the annular closed chamber, so that the leaked natural gas is located in the annular closed chamber, and the natural gas leakage is effectively prevented;

[0043] In some possible embodiments, the upper hoop assembly (1) comprises two groups of upper semicircle hoops which are identical in structure and connected with each other; the two groups of upper semicircle hoops are matched with each other to form an upper cylindrical cavity, the upper semicircle hoops are provided with a pressure relief hole (111) and a pressure taking hole (112), the pressure relief hole (111) is provided with a pressure relief pipeline, and the pressure taking hole (112) is provided with a pressure gauge and a stop valve;

[0044] The two groups of upper semicircle hoops are sleeved outside the flange (10) and connected with each other, and the upper sleeve (20) is located in the upper cylindrical cavity formed by the two groups of upper semicircle hoops; the pressure gauge is arranged to realize real-time monitoring of the pressure in the annular closed chamber, and the pressure relief pipeline is arranged to discharge the natural gas in the annular closed chamber according to the pressure in the annular closed chamber to realize pressure relief, so that the device is effectively prevented from being damaged due to the excessively high pressure in the annular closed chamber, timely pressure relief and well killing are realized, the wellhead safety is ensured, the construction risk is reduced, the wellbore pollution and other adverse effects are avoided, and the effects of high efficiency, low cost, quick effect and hidden danger treatment are achieved;

[0045] Specifically, the pressure relief pipeline comprises a pressure relief pipe connected with the pressure relief hole (111) and a control valve installed on the pressure relief pipe;

[0046] In some possible implementation manners, the upper half hoop comprises an upper half cylinder 11 in a semicircular arc shape, and an upper connecting plate 12 connected with the upper half cylinder 11 and in a semicircular ring shape; two groups of upper half cylinders 11 are matched with each other to form an upper cylindrical cavity, and the inner diameter of the upper cylindrical cavity is consistent with the inner diameter of the upper connecting plate 12 and is coaxially arranged; the upper connecting plate 12 is arranged on one side of the upper half cylinder 11 close to the lower hoop assembly 2 and is connected with the lower hoop assembly 2;

[0047] The two groups of upper half cylinders 11 are clamped on the outer side of the flange plate 10 and are sealed between each other; the two groups of upper half cylinders 11 are fixed by bolt connection to form an integral whole, and the upper sleeve 20 is located in the upper cylindrical cavity formed by the two groups of upper half cylinders 1;

[0048] The upper connecting plate 12 is arranged on one side of the upper half cylinder 11 close to the lower hoop assembly 2, and is used for connecting and fixing the upper hoop assembly 1 and the lower hoop assembly 2;

[0049] In some possible implementation manners, the lower hoop assembly 2 comprises two groups of lower half hoops which are the same in structure and are connected with each other;

[0050] The two groups of lower half hoops are matched with each other to form a lower half cylindrical cavity which is communicated with the upper cylindrical cavity; the diameter of the upper cylindrical cavity is greater than the diameter of the lower cylindrical cavity and is equal to the outer diameter of the flange plate 10;

[0051] The diameter of the upper cylindrical cavity is greater than the diameter of the lower cylindrical cavity, the diameter of the lower cylindrical cavity is matched with the inner diameter of the lower sleeve 30, and the two are sealed between each other, so that an annular chamber is formed between the outer side of the upper sleeve 20 and the inner side of the upper hoop assembly 1, and the damaged part is located in the annular chamber;

[0052] Since the flange plate 10 and the upper hoop assembly 1 are sealed between each other, and the upper hoop assembly 1 and the lower hoop assembly 2 are sealed between each other, the annular chamber is closed to form an annular sealed chamber, and the natural gas leaked from the damaged part can only enter the annular sealed chamber; only when the pressure is high, the natural gas is discharged through the pressure relief pipeline;

[0053] In some possible implementation manners, the lower half hoop comprises a lower connecting plate 21 connected with the upper connecting plate 12 and in a semicircular ring shape, a lower half cylinder 22 connected with the lower connecting plate 21 and in a semicircular arc shape, and a link plate 23 which is the same in structure as the lower connecting plate 21 and is arranged at one end of the lower half cylinder 22 close to the support hoop assembly 3; the inner diameters of the lower connecting plate 21, the lower half cylinder 22 and the link plate 23 are consistent and coaxially arranged;

[0054] The lower connecting plate 21 is used for connecting with the upper connecting plate 12 and supporting the upper hoop assembly 1;

[0055] The lower half cylinder 22 is clamped on the outside of the lower sleeve 30, and the two are sealed to prevent natural gas from leaking between the lower half cylinder 22 and the lower sleeve 30;

[0056] The adapter plate 23 acts on the support hoop assembly 3 through the support bolt 4, thereby effectively supporting and fixing the upper hoop assembly 1 and the lower hoop assembly 2 through the support hoop assembly 3;

[0057] In some possible embodiments, a plurality of sets of upper connection holes 121 are arranged on the upper connection plate 12, and the plurality of sets of upper connection holes 121 are arranged along the circumference of the upper connection plate 12; a plurality of lower connection holes corresponding to the upper connection holes 121 are arranged on the lower connection plate 21; and a plurality of sets of through holes 231 are arranged on the adapter plate 23, and the plurality of sets of through holes 231 are uniformly arranged along the circumference of the adapter plate 23;

[0058] Further, the upper connection holes 121, the lower connection holes, and the through holes 231 are all waist-shaped holes, the long axis direction of the upper connection holes 121 is arranged along the radial direction of the upper connection plate 12, and the long axis direction of the lower connection holes and the through holes 231 is arranged along the radial direction of the lower connection plate 21; through the arrangement of the waist-shaped holes, the connection between the upper hoop assembly 1, the lower hoop assembly 2, and the support hoop assembly 3 of different shafts can be satisfied;

[0059] In some possible embodiments, the support hoop assembly 3 includes two sets of semicircular hoops that are the same in structure and connected to each other; and the two sets of semicircular hoops form a cylindrical clamping cavity;

[0060] The semicircular hoop includes a clamping hoop 31 in the shape of a semicircular arc and a support plate 32 in the shape of a semicircular ring arranged on the side of the clamping hoop 31 close to the lower connection plate 21; the two sets of clamping hoops 31 form a cylindrical clamping cavity and are sleeved on the outside of the support sleeve 40, and the support plate 32 is connected to the lower connection plate 21 through the support bolt 4;

[0061] The semicircular hoop clamps the outside of the support sleeve 40 and forms an integral whole with the support sleeve 40, the support plate 32 is arranged on the side of the clamping hoop 31 close to the lower hoop assembly 2, one end of the support bolt 4 is mounted on the support plate 32 and the other end penetrates through the through hole 231 to support the adapter plate 23, thereby supporting and fixing the lower hoop assembly 2 and the upper hoop assembly 1;

[0062] A mounting method of the wellhead lifting spool breakage leakage treatment device, specifically comprising the following steps:

[0063] The support hoop assembly 3 is sleeved on the outside of the support sleeve 40 and coaxially arranged, and the support sleeve 40 is clamped and fixed through the clamping hoop 31; the two sets of clamping hoops 31 are fixed through bolt connection;

[0064] The lower clamp assembly 2 is installed outside the lower sleeve 30 and coaxially arranged with the lower sleeve 30; the support bolt 4 is installed on the support clamp assembly 3 to support and fix the lower clamp assembly 2;

[0065] Two groups of lower half cylinders 22 are clamped outside the lower sleeve 30, and the two groups of lower half cylinders 22 are connected by bolts and clamped outside the lower sleeve 30; the connecting plate 23 is fixed by the support bolt 4;

[0066] A sealing rubber strip is arranged between the lower half cylinder 22 and the lower sleeve 30 to realize sealing treatment between the two;

[0067] The upper clamp assembly 1 is installed outside the upper sleeve 20 and the flange plate 10 located at the top of the upper sleeve 20, and the upper clamp assembly 1 is coaxially arranged with the flange plate 10;

[0068] The upper clamp assembly 1 and the lower clamp assembly 2 are connected and fixed, and sealing treatment is performed between the upper clamp assembly 1 and the lower clamp assembly 2, between the outer side of the flange plate 10 and the inner side of the upper clamp assembly 1, and at the connecting bolt arranged on the flange plate 10, so that the bottom of the flange plate 10, the outer side of the upper sleeve 20, the inner side of the upper clamp assembly 1, and the top surface of the lower clamp assembly 2 cooperate to form an annular closed chamber;

[0069] The pressure relief hole 111 is located at the installation position of the pressure relief pipeline, and the stop valve and the pressure gauge are installed at the pressure tapping hole 112.

[0070] The present application is not limited to the foregoing specific embodiments. The present application extends to any novel feature or any new combination disclosed in this specification, and any new method or process steps or any new combination disclosed.

Claims

1. A device for treating a damaged wellhead riser crossover, the riser crossover comprising an upper casing, a lower casing and a support casing, the casings decreasing in diameter in order from top to bottom; characterized in that, The device comprises an upper hoop assembly, a lower hoop assembly and a support hoop assembly which are sequentially connected from top to bottom and are sleeved outside the elevated short connection; the upper hoop assembly is sleeved outside the upper sleeve, the lower hoop assembly is sleeved outside the lower sleeve, and the support sleeve is sleeved outside the support sleeve.

2. The wellhead elevation pup joint break and external leak disposal device of claim 1, wherein, The upper hoop assembly comprises two groups of upper semicircle hoops which are identical in structure and are connected to each other; the two groups of upper semicircle hoops are matched to form an upper cylindrical cavity; the upper semicircle hoops are provided with pressure relief holes and pressure tapping holes; the pressure relief holes are provided with pressure relief pipelines; the pressure tapping holes are provided with pressure gauges and stop valves.

3. The wellhead elevating pup joint breakage and leakage disposal device according to claim 2, characterized in that, The upper semicircle hoop comprises an upper semicircle cylinder which is semicircular in cross section, and an upper connecting plate which is connected to the upper semicircle cylinder and is semicircular in structure; the two groups of upper semicircle cylinders are matched to form an upper cylindrical cavity, and the inner diameter of the upper semicircle cylinder is consistent with the inner diameter of the upper connecting plate; the upper connecting plate is arranged on the side of the upper semicircle cylinder close to the lower hoop assembly and is connected to the lower hoop assembly.

4. The wellhead elevating pup joint breakage and external leakage disposal device according to claim 3, characterized in that, The lower hoop assembly comprises two groups of lower semicircle hoops which are identical in structure and are connected to each other. The two groups of lower semicircle hoops are matched to form a lower semicircle cavity which is communicated with the upper cylindrical cavity; the diameter of the upper cylindrical cavity is larger than the diameter of the lower cylindrical cavity.

5. The wellhead elevating pup joint break and external leak handling device of claim 4, wherein, The lower semicircle hoop comprises a lower connecting plate which is connected to the upper connecting plate and is semicircular in structure, a lower semicircle cylinder which is connected to the lower connecting plate and is semicircular in structure, and a link plate which is identical in structure to the lower connecting plate and is arranged on the end of the lower semicircle cylinder close to the support hoop assembly; the inner diameters of the lower connecting plate, the lower semicircle cylinder and the link plate are consistent.

6. The wellhead elevating pup joint break and external leak handling device of claim 5, wherein, The upper connecting plate is provided with a plurality of upper connecting holes which are arranged along the circumference of the upper connecting plate; the lower connecting plate is provided with lower connecting holes which are arranged correspondingly to the upper connecting holes; the link plate is provided with a plurality of through holes which are uniformly arranged along the circumference of the link plate.

7. The wellhead elevating pup joint break and external leak handling device of claim 5, wherein, The upper connecting plate and the lower connecting plate are sealingly connected to each other; the lower semicircle hoop and the lower sleeve are sealingly connected to each other.

8. The wellhead elevating pup joint break and external leak handling device of claim 5, wherein, The support hoop assembly comprises two groups of semicircle hoops which are identical in structure and are connected to each other; the two groups of semicircle hoops form a cylindrical clamping cavity.

9. The wellhead elevating pup joint break and external leak handling device of claim 8, wherein, The semicircle hoop comprises a clamping hoop which is semicircular in structure, and a support plate which is connected to the clamping hoop on the side close to the lower connecting plate and is semicircular in structure; the two groups of clamping hoops form a cylindrical clamping cavity and are sleeved outside the support sleeve; the support plate is connected to the lower connecting plate through support bolts.

10. The installation method of the wellhead elevated short connection leakage treatment device according to any one of claims 1-9, wherein, the support hoop assembly is sleeved outside the support sleeve and is coaxially arranged, and the support sleeve is clamped and fixed by the support hoop assembly; the lower hoop assembly is arranged outside the lower sleeve and is coaxially arranged with the lower sleeve; the support bolts are arranged on the support hoop assembly to support and fix the lower hoop assembly; a sealing rubber strip is arranged between the lower hoop assembly and the lower sleeve; the upper hoop assembly is arranged outside the upper sleeve and the flange plate arranged on the top of the upper sleeve, and the upper hoop assembly is coaxially arranged with the flange plate; The upper and lower hoop assemblies are connected and fixed, and sealing treatment is performed between the upper and lower hoop assemblies, between the outer side of the flange plate and the inner side of the upper hoop assembly, and at the connecting bolt provided on the flange plate, so that the bottom of the flange plate, the outer side of the upper sleeve, the inner side of the upper hoop assembly, and the top surface of the lower hoop cooperate to form an annular closed chamber; The pressure relief hole is located at the installation pressure relief pipeline, a stop valve and a pressure gauge are installed at the pressure tapping hole.

Images