A sealing ring fixing device and a method for installing a cylinder assembly and a tube bundle assembly

Abstract

The application discloses a fixing device of a sealing ring and a mounting method of a cylinder assembly and a tube bundle assembly. The fixing device of the sealing ring comprises a plurality of guide rods and a pressing mechanism sleeved outside the guide rods. A C-shaped sealing ring is sleeved outside a tube bundle sleeve. The guide rods are distributed on the outer surface of the C-shaped sealing ring in parallel and at intervals. The axis of each guide rod is parallel to the axis of the C-shaped sealing ring. The pressing mechanism is arranged outside the guide rods to make the guide rods tightly adhere to the outer surface of the tube bundle sleeve and press the C-shaped sealing ring and the tube bundle sleeve. The friction between the guide rods and the pressing mechanism is greater than the friction between the guide rods and the C-shaped sealing ring and greater than the friction between the guide rods and the tube bundle sleeve. The application has the advantages of simple structure and convenient use. The mounting method of the cylinder assembly and the tube bundle assembly adopts the fixing device of the sealing ring and presses the C-shaped sealing ring through the pressing mechanism, so that the cylinder assembly and the tube bundle assembly can be smoothly mounted.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of storage and arrangement devices, and particularly relates to a sealing ring fixing device and a mounting method of a cylinder assembly and a tube bundle assembly. BACKGROUND

[0002] At present, two layers of C-shaped sealing rings need to be installed on the sealing ring groove of the tube bundle assembly-tube bundle sleeve of a certain nuclear power project. When the cylinder assembly and the tube bundle assembly are sleeved, the ring cavity sleeve is pressed against the C-shaped sealing ring to realize the sealing between the ring cavity sleeve and the tube bundle sleeve. Since the C-shaped sealing ring has a large diameter and a certain elasticity, it is difficult to be automatically pressed. Therefore, after the C-shaped sealing ring is installed on the tube bundle sleeve, the diameter is larger than the inner diameter of the ring cavity sleeve, thereby affecting the assembly of the ring cavity sleeve and the tube bundle sleeve. In addition, the distance between the end of the ring cavity sleeve and the end of the cylinder assembly is large, and the gap between the inner wall of the cylinder assembly and the tube bundle sleeve is small during the sleeving. Due to the limited space, it is difficult to observe the sleeving state of the C-shaped sealing ring, and it is impossible to manually realize the pressing and fitting of the C-shaped sealing ring and the tube bundle sleeve. The common operation method during sleeving is to manufacture a sealing ring groove that can be matched with the installation of the C-shaped sealing ring, so that the width of the ring groove is matched with the width of the C-shaped sealing ring as much as possible to realize the automatic clamping of the sealing ring after installation. The machining of such a sealing ring groove is difficult, and the sealing ring groove of the tube bundle sleeve is too narrow, which will cause the C-shaped sealing ring to be clamped by the sealing ring groove, and the tube bundle sleeve cannot be freely rebounded after being sleeved, and the sealing function cannot be realized. If the sealing ring groove is too wide, the C-shaped sealing ring cannot be pressed tightly. The C-shaped sealing ring will be opened again under slight external force after being temporarily pressed, and the double-layer C-shaped sealing ring needs to be sleeved, which will affect each other and it is difficult to ensure the consistency of the two groups.

[0003] Therefore, a new technology is needed to solve the problem of the difficulty in fixing the C-shaped sealing ring during the sleeving of the cylinder assembly and the tube bundle assembly in the prior art. SUMMARY

[0004] To solve the above problems in the prior art, the application provides a sealing ring fixing device and a mounting method of a cylinder assembly and a tube bundle assembly, which can conveniently press and fix the C-shaped sealing ring during the sleeving of the cylinder assembly and the tube bundle assembly, and has the effect of smoothly sleeving the cylinder assembly and the tube bundle assembly.

[0005] The application adopts the following technical solutions:

[0006] A fixing device of a sealing ring comprises a plurality of guide rods and a compression mechanism sleeved outside the guide rods, a tube bundle assembly comprises a tube bundle sleeve, a C-shaped sealing ring is sleeved outside the tube bundle sleeve, the guide rods are evenly distributed on the outer surface of the C-shaped sealing ring in parallel and at intervals, and the axes of the guide rods are parallel to the axis of the C-shaped sealing ring; the compression mechanism is sleeved outside the guide rods, and the compression mechanism is used for tightly attaching the guide rods to the outside of the tube bundle sleeve and compressing the C-shaped sealing ring and the tube bundle sleeve.

[0007] The friction between the guide rods and the compression mechanism is greater than the friction between the guide rods and the C-shaped sealing ring and greater than the friction between the guide rods and the tube bundle sleeve.

[0008] As a further improvement of the technical scheme of the present application, the two ends of each guide rod are flush with each other.

[0009] As a further improvement of the technical scheme of the present application, the compression mechanism comprises a compression ring in the shape of a ring, the compression ring is sleeved outside the guide rods, and the axis of the compression ring coincides with the axis of the tube bundle sleeve.

[0010] As a further improvement of the technical scheme of the present application, the compression ring is a flat woven belt ring formed around the guide rods.

[0011] As a further improvement of the technical scheme of the present application, the compression mechanism further comprises a ratchet tightener used for tightening the two ends of the compression ring.

[0012] As a further improvement of the technical scheme of the present application, a limiting groove is formed on the outside of each guide rod for embedding the compression ring, and the length direction of the limiting groove is perpendicular to the axis of the guide rod.

[0013] As a further improvement of the technical scheme of the present application, a through hole is formed in the middle of each guide rod for the compression ring to pass through, and the length direction of the through hole is perpendicular to the axis of the guide rod.

[0014] A mounting method of a cylinder assembly and a tube bundle assembly comprises the fixing device of the sealing ring as described above, and comprises the following steps:

[0015] S1. installing the C-shaped sealing ring outside the tube bundle sleeve;

[0016] S2. evenly arranging the guide rods on the outer circumference of the C-shaped sealing ring, and using the compression mechanism to bundle the guide rods on the outer circumference of the C-shaped sealing ring to compress the C-shaped sealing ring and the tube bundle sleeve;

[0017] S3. The barrel assembly comprises a ring cavity sleeve, when the ring cavity sleeve is butted with the tube bundle outer sleeve, the barrel assembly butting groove upper end surface gradually approaches the tube bundle assembly butting groove lower end surface, the ring cavity sleeve lower end surface can abut against the upper end surface of each guide rod to drive the guide rods to move downward synchronously; the distance A between the barrel assembly butting groove upper end surface and the ring cavity sleeve lower end surface is measured in real time, the distance B between the tube bundle assembly butting groove lower end surface and the C-shaped sealing ring upper end surface is measured in real time, the distance C between the tube bundle assembly butting groove lower end surface and the C-shaped sealing ring lower end surface is measured in real time, and the distance Δ between the barrel assembly butting groove upper end surface and the tube bundle assembly butting groove lower end surface is measured in real time;

[0018] When Δ=B-A, the ring cavity sleeve is about to be sleeved into the C-shaped sealing ring;

[0019] When Δ=C-A, the ring cavity sleeve has been completely sleeved into the C-shaped sealing ring, at this time, the pressing mechanism is removed;

[0020] S4. Continue to assemble the barrel assembly and the tube bundle assembly until the barrel assembly butting groove upper end surface is butted with the tube bundle assembly butting groove lower end surface.

[0021] As a further improvement of the technical scheme of the application, in step S3, when the pressing mechanism is removed, each guide rod falls into the bottom of the tube bundle assembly due to gravity, and each guide rod is clamped by the barrel assembly and the tube bundle assembly butting groove ring joint.

[0022] As a further improvement of the technical scheme of the application, in step S4, after the barrel assembly butting groove upper end surface is butted with the tube bundle assembly butting groove lower end surface, the butting groove is sealed.

[0023] Compared with the prior art, the application has the following beneficial effects:

[0024] The pressing mechanism in the scheme can press the C-shaped sealing ring outside the tube bundle outer sleeve, realize the tightening and fitting of the C-shaped sealing ring and the tube bundle outer sleeve, make the outer diameter of the C-shaped sealing ring smaller, and thus successfully assemble the ring cavity sleeve and the tube bundle outer sleeve together. The fixing device of the sealing ring has a simple structure and is convenient to use, when the barrel assembly and the tube bundle assembly are installed, the C-shaped sealing ring can be pressed by the pressing mechanism, and the guide rods can also serve as the extension of the ring cavity sleeve and have a certain guiding effect, so that the barrel assembly and the tube bundle assembly can be successfully installed. BRIEF DESCRIPTION OF DRAWINGS

[0025] The technology of the application will be further described in detail below in combination with the drawings and specific embodiments:

[0026] Figure 1Figure 6 is a cross-sectional view of the connecting structure of the guide rod, the compression mechanism and the C-shaped sealing ring of the present application;

[0027] Figure 2 Figure 7 is a structural view of the abutment of the cylinder assembly and the tube bundle assembly of the present application;

[0028] Figure 3 Figure 8 is a structural view of the abutment of the guide rod and the compression ring of the present application; Figure 2

[0029] Figure 4 Figure 9 is a structural view of the connecting structure of the guide rod, the compression ring and the C-shaped sealing ring when the ring cavity sleeve and the guide rod are in contact or abutment;

[0030] Figure 5 Figure 10 is a structural view of the guide rod, the compression ring and the C-shaped sealing ring when they are separated;

[0031] Figure 6 Figure 11 is a schematic view of the distances A, B, C and Δ of the present application.

[0032] Reference signs:

[0033] 1 - guide rod;

[0034] 2 - compression mechanism; 21 - compression ring; 22 - ratchet tightener;

[0035] 3 - tube bundle assembly; 31 - tube bundle outer sleeve; 32 - lower end surface of abutment bevel;

[0036] 4 - cylinder assembly; 41 - ring cavity sleeve; 42 - upper end surface of abutment bevel;

[0037] 5 - C-shaped sealing ring;

[0038] 6 - distance A;

[0039] 7 - distance B;

[0040] 8 - distance C;

[0041] 9 - distance Δ. DETAILED DESCRIPTION

[0042] The concept, specific structure and technical effects of the present application will be described clearly and completely in combination with the embodiments and the drawings, so as to fully understand the purpose, scheme and effects of the present application. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The same reference signs used in the drawings indicate the same or similar parts.

[0043] ​It should be noted that, unless otherwise specified, when a certain feature is said to be "fixed" or "connected" to another feature, it can be directly fixed or connected to the other feature, or indirectly fixed or connected to the other feature. In addition, the up, down, left, right and other descriptions used in the present application are only relative to the mutual position relationship of the components of the present application in the drawings.

[0044] Embodiment 1

[0045] With reference to Figures 1 to 6 A sealing ring fixing device, comprising a plurality of guide rods 1 and a pressing mechanism 2 sleeved outside the plurality of guide rods 1, a tube bundle assembly 3 comprising a tube bundle outer sleeve 31, and a C-shaped sealing ring 5 sleeved outside the tube bundle outer sleeve 31. The plurality of guide rods 1 are evenly distributed in parallel on the outer surface of the C-shaped sealing ring 5, and the axis of each guide rod 1 is parallel to the axis of the C-shaped sealing ring 5. The pressing mechanism 2 is sleeved outside the plurality of guide rods 1, and is used to tightly attach the plurality of guide rods 1 to the outside of the tube bundle outer sleeve 31 and press the C-shaped sealing ring 5 and the tube bundle outer sleeve 31. The friction between each guide rod 1 and the pressing mechanism 2 is greater than the friction between each guide rod 1 and the C-shaped sealing ring 5, and greater than the friction between each guide rod 1 and the tube bundle outer sleeve 31, so as to ensure that the pressing mechanism 2 can move relative to the C-shaped sealing ring 5 to separate and smoothly move along the tube bundle outer sleeve 31.

[0046] Since the C-shaped sealing ring 5 has a large diameter and a certain elasticity, it is difficult to automatically tighten. After the C-shaped sealing ring 5 is installed on the tube bundle outer sleeve 31, the outer diameter of the C-shaped sealing ring 5 is greater than the inner diameter of the ring cavity sleeve 41, thereby affecting the assembly of the ring cavity sleeve 41 and the tube bundle outer sleeve 31. The pressing mechanism 2 in the present solution can press the C-shaped sealing ring 5 outside the tube bundle outer sleeve 31, realize the tightening and fitting of the C-shaped sealing ring 5 and the tube bundle outer sleeve 31, and reduce the outer diameter of the C-shaped sealing ring 5, so as to smoothly assemble the ring cavity sleeve 41 and the tube bundle outer sleeve 31 together.

[0047] Specifically, the two ends of each guide rod 1 are flush with each other, which is conducive to the end of the ring cavity sleeve 41 simultaneously contacting each guide rod 1, and the end of the ring cavity sleeve 41 is uniformly stressed during the process of pushing the guide rod 1 downward, so as to smoothly drive the plurality of guide rods 1 to move downward synchronously, and without damaging the structure of the end of the ring cavity sleeve 41.

[0048] Specifically, each guide rod 1 has the same structure and is cylindrical, and can be preferably made of a light material such as nylon, which has a small friction coefficient when contacting the metal sleeve and the sealing ring, so as to avoid scratching or bumping the product during the movement of the guide rod 1, and the light material of the guide rod 1 is convenient to take out when disassembled.

[0049] Specifically, the compression mechanism 2 comprises a compression ring 21 in the shape of a ring, which is sleeved outside the plurality of guide rods 1, and the axis of the compression ring 21 coincides with the axis of the tube bundle outer sleeve 31.

[0050] Specifically, the compression ring 21 is formed by wrapping a flat woven belt outside the plurality of guide rods 1, and the compression mechanism 2 further comprises a ratchet tightener 22 for tightening the two ends of the compression ring 21, thereby compressing the C-shaped sealing ring 5 and the tube bundle outer sleeve 31. The compression mechanism 2 is composed of a flat woven belt and a ratchet tightener 22, and the friction coefficient or friction force between the woven belt and the guide rod 1 should be greater than the friction coefficient or friction force between the guide rod 1 and the tube bundle outer sleeve 31, and greater than the friction coefficient or friction force between each guide rod 1 and the C-shaped sealing ring 5, so as to ensure that when the combined structure of the ratchet tightener 22 and the guide rod 1 moves along the tube bundle outer sleeve 31, the woven belt does not appear obvious dislocation relative to the guide rod 1. The compression mechanism 2 of the present scheme has a simple structure and is easy to use. When compressing the C-shaped sealing ring 5 and the tube bundle outer sleeve 31, no adhesive is needed, and no foreign matter is left. For a nuclear power project direct-flow steam generator, it can meet the higher product cleanliness requirements.

[0051] Embodiment 2

[0052] Referring to Figures 1 to 6 In the present embodiment, the structure of each guide rod 1 is different from that in Embodiment 1, and a limiting groove for embedding the compression ring 21 is formed outside each guide rod 1, and the length direction of the limiting groove is perpendicular to the axis of the guide rod 1. The arrangement of the limiting groove can ensure that the compression ring 21, the ratchet tightener 22 and each guide rod 1 move synchronously, reducing the risk of dislocation.

[0053] Embodiment 3

[0054] Referring to Figures 1 to 6 In the present embodiment, the structure of each guide rod 1 is different from that in Embodiments 1 and 2, and a through hole for passing the compression ring 21 is formed in the middle of each guide rod 1, and the length direction of the through hole is perpendicular to the axis of the guide rod 1. The arrangement of the through hole can ensure that the compression ring 21, the ratchet tightener 22 and each guide rod 1 move synchronously, reducing the risk of dislocation.

[0055] A mounting method of a cylinder assembly and a tube bundle assembly, comprising the fixing device of the sealing ring as described above, referring to Figures 1 to 6 , comprising the following steps:

[0056] S1. Installing the C-shaped sealing ring 5 outside the tube bundle outer sleeve 31.

[0057] S2. After the C-shaped sealing ring 5 is installed to the pipe bundle outer sleeve 31, a plurality of the guide rods 1 are uniformly arranged on the outer circumference of the C-shaped sealing ring 5, and the pressing mechanism 2 is used to bundle the plurality of guide rods 1 on the outer circumference of the C-shaped sealing ring 5 to press the C-shaped sealing ring 5 and the pipe bundle outer sleeve 31. In this case, the guide rods 1 can be bundled by using a woven belt, and a ratchet is used to transmit the bundling force to the guide rods 1 to achieve the pressing of the C-shaped sealing ring 5.

[0058] S3. The cylinder assembly 4 includes a ring cavity sleeve 41. When the ring cavity sleeve 41 is butted with the pipe bundle outer sleeve 31, the cylinder assembly 4 is located above the pipe bundle assembly 3, and the ring cavity sleeve 41 is sleeved from the upper part. The centering of the cylinder assembly 4 and the pipe bundle assembly 3 is adjusted, and then the cylinder assembly 4 is moved downward. The butting upper end surface 42 of the cylinder assembly 4 gradually approaches the butting lower end surface 32 of the pipe bundle assembly 3. During the downward movement, the lower end surface of the ring cavity sleeve 41 can abut against the upper end surface of each guide rod 1 to drive the plurality of guide rods 1 to move downward synchronously. The guide rods 1 can constrain the C-shaped sealing ring 5 during the sleeving process, play a pressing role, and avoid radial size interference. The guide rods 1 can also serve as an extension of the ring cavity sleeve 41 and play a guiding role in the sleeving of the ring cavity sleeve 41 relative to the C-shaped sealing ring 5. During the installation of the cylinder assembly 4 and the pipe bundle assembly 3, the distance A6 between the butting upper end surface 42 of the cylinder assembly 4 and the lower end surface of the ring cavity sleeve 41 is measured in real time, the distance B7 between the butting lower end surface 32 of the pipe bundle assembly 3 and the upper end surface of the C-shaped sealing ring 5 is measured in real time, the distance C8 between the butting end surface of the pipe bundle assembly 3 and the lower end surface of the C-shaped sealing ring 5 is measured in real time, and the distance △9 between the butting upper end surface 42 of the cylinder assembly 4 and the butting lower end surface 32 of the pipe bundle assembly 3 is measured in real time.

[0059] When △ = B - A, it can be confirmed that the ring cavity sleeve 41 is about to be sleeved into the C-shaped sealing ring 5; when △ = C - A, it can be confirmed that the ring cavity sleeve 41 has been completely sleeved into the C-shaped sealing ring 5, at which time the pressing mechanism 2 is removed. When the pressing mechanism 2 is removed, each guide rod 1 falls into the bottom of the pipe bundle assembly 3 due to gravity and is clamped out by the butting ring joint between the cylinder assembly 4 and the pipe bundle assembly 3. After the pressing mechanism 2 is removed, the C-shaped sealing ring 5 can automatically rebound and will not adversely affect its sealing function.

[0060] When the cylinder assembly 4 is assembled with the tube bundle assembly 3, the distance between the end of the ring cavity sleeve 41 and the end of the cylinder assembly 4 is large, and the gap between the inner wall of the cylinder assembly 4 and the outer sleeve 31 of the tube bundle is small, so it is difficult to observe the state of the C-shaped sealing ring 5 during the assembly. In the present scheme, the value of △ is measured, which facilitates the confirmation of the state of the internal ring cavity sleeve 41. When △ = B-A, it indicates that the ring cavity sleeve 41 has contacted the end of the C-shaped sealing ring 5. During the subsequent downward movement, the guide rod 1, the compression ring 21, the ratchet tightener 22 and the ring cavity sleeve 41 are synchronously lowered, and the ring cavity sleeve 41 is gradually sleeved outside the C-shaped sealing ring 5. When △ = C-A, it indicates that the ring cavity sleeve 41 has been completely sleeved outside the C-shaped sealing ring 5. At this time, the ratchet tightener 22 can be loosened, and the ratchet tightener 22, the compression ring 21 and all the guide rods 1 fall into the bottom of the tube bundle assembly 3 due to gravity. The ratchet tightener 22, the compression ring 21 and all the guide rods 1 are clamped by the butt joint groove seam of the cylinder assembly 4 and the tube bundle assembly 3.

[0061] S4. Continue to assemble the cylinder assembly 4 and the tube bundle assembly 3 until the upper end face 42 of the butt joint groove of the cylinder assembly 4 is connected with the lower end face 32 of the butt joint groove of the tube bundle assembly 3. After the upper end face 42 of the butt joint groove of the cylinder assembly 4 is connected with the lower end face 32 of the butt joint groove of the tube bundle assembly 3, the sealing of the butt joint groove is performed.

[0062] Other contents of the sealing ring fixing device and the installation method of the ring cavity sleeve according to the present application can be referred to the prior art, which will not be described here.

[0063] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Any modification, equivalent change and modification of the above embodiment based on the technical essence of the present application, without departing from the technical solution of the present application, still belongs to the scope of the technical solution of the present application.

Claims

1. A seal ring retaining device characterized by: The pipe bundle assembly comprises a pipe bundle sleeve, a C-shaped sealing ring is sleeved outside the pipe bundle sleeve, a plurality of guide rods are uniformly and evenly distributed on the outer surface of the C-shaped sealing ring, the axes of the guide rods are parallel to the axis of the C-shaped sealing ring, a compression mechanism is sleeved outside the guide rods, the compression mechanism is used to tightly press the guide rods against the outside of the pipe bundle sleeve and tightly press the C-shaped sealing ring against the pipe bundle sleeve. The friction between each guide rod and the compression mechanism is greater than the friction between each guide rod and the C-shaped sealing ring and the friction between each guide rod and the pipe bundle sleeve.

2. The seal ring securing apparatus of claim 1, wherein: The two ends of each guide rod are flush with each other.

3. The seal ring securing device of claim 1, wherein: The compression mechanism comprises a ring-shaped compression ring, the compression ring is sleeved outside the guide rods, and the axis of the compression ring coincides with the axis of the pipe bundle sleeve.

4. The seal ring securing apparatus of claim 3, wherein: The compression ring is a flat woven belt.

5. The seal ring securing apparatus of claim 4, wherein: The compression mechanism further comprises a ratchet tightener for tightening the two ends of the compression ring.

6. The seal ring securing apparatus of claim 3, wherein: A limiting groove is formed on the outside of each guide rod, the limiting groove is used to embed the compression ring, and the length direction of the limiting groove is perpendicular to the axis of the guide rod.

7. The seal ring securing apparatus of claim 3, wherein: A through hole is formed in the middle of each guide rod, the through hole is used to pass through the compression ring, and the length direction of the through hole is perpendicular to the axis of the guide rod.

8. A method of installing a shell assembly and tube bundle assembly including a seal ring retaining device as claimed in any one of claims 1 to 7, characterised by: The method comprises the following steps: S1. The C-shaped sealing ring is installed outside the pipe bundle sleeve. S2. A plurality of guide rods are uniformly arranged on the outer circumference of the C-shaped sealing ring, and a compression mechanism is used to bundle the guide rods on the outer circumference of the C-shaped sealing ring to tightly press the C-shaped sealing ring against the pipe bundle sleeve. S3. The cylinder assembly comprises a ring cavity sleeve, when the ring cavity sleeve is connected with the pipe bundle sleeve, the upper end surface of the cylinder assembly connection groove gradually approaches the lower end surface of the pipe bundle assembly connection groove, the lower end surface of the ring cavity sleeve can abut against the upper end surface of each guide rod to drive the guide rods to move downward synchronously, the distance A between the upper end surface of the cylinder assembly connection groove and the lower end surface of the ring cavity sleeve is measured in real time, the distance B between the lower end surface of the pipe bundle assembly connection groove and the upper end surface of the C-shaped sealing ring is measured in real time, the distance C between the lower end surface of the pipe bundle assembly connection groove and the upper end surface of the C-shaped sealing ring is measured in real time, and the distance △ between the upper end surface of the cylinder assembly connection groove and the lower end surface of the pipe bundle assembly connection groove is measured in real time. When △ = B - A, the ring cavity sleeve is about to be sleeved in the C-shaped sealing ring. When △ = C - A, the ring cavity sleeve has been completely sleeved in the C-shaped sealing ring, at this time, the compression mechanism is removed. S4. Continue to sleeve the cylinder assembly and the pipe bundle assembly until the upper end surface of the cylinder assembly connection groove is connected with the lower end surface of the pipe bundle assembly connection groove.

9. The method of installing a cartridge assembly with a tube bundle assembly of claim 8, wherein: In step S3, when the compression mechanism is removed, each guide rod falls into the bottom of the pipe bundle assembly due to gravity, and each guide rod is clamped at the annular joint between the cylinder assembly and the pipe bundle assembly connection groove.

10. The method of installing a cartridge assembly with a tube bundle assembly of claim 8, wherein: In step S4, the upper end face of the butt joint groove of the cylinder assembly is sealed after being butted with the lower end face of the butt joint groove of the pipe bundle assembly.

Images