Strength testing device for flange-free pipe

Abstract

The utility model discloses a flange-free pipe strength test device, which is used for a test tube and comprises a Stelabor pipe joint, a connecting short pipe, a connecting plate, a deflation valve and a water pressure test table, and the left end and the right end of the test tube are respectively and fixedly connected with one end of the connecting short pipe through the Stelabor pipe joint. A connecting plate is fixedly welded to the other end of the connecting short pipe, a connector is fixedly connected to the center of the outer side face of each connecting plate in a penetrating mode, the connectors located on the two sides are fixedly communicated with the water pressure test table and the deflation valve respectively, and the outer diameter of the connecting short pipe, the outer diameter of the test tube and the inner diameter of the Stelao pipe connector are consistent. According to the utility model, the strength test pipe is connected with the test short pipe by arranging the Slope type pipe joint, so that the pipe cannot be damaged, and the strength test device can be suitable for the strength test of a flange-free thin-wall pipe and a non-ferrous metal pipe; meanwhile, the device is simple in structure, low in manufacturing cost and capable of being repeatedly used, and has the advantages of being convenient to operate and high in efficiency.

Description

Technical Field

[0001] The utility model belongs to the technical field of shipbuilding, and particularly relates to a flange-free pipe strength test device. Background Technique

[0002] During the shipbuilding process, strength tests are required during the pipe manufacturing process. Some pipes are flange-free pipes, and it is very inconvenient to conduct strength tests. Although the prior art can achieve flange-free pipe strength tests, there are the following two problems:

[0003] First, the auxiliary devices used will more or less damage the pipe surface and are not suitable for thin-walled pipes and non-ferrous metal pipes;

[0004] Second, the installation and use of the auxiliary devices are relatively cumbersome.

[0005] After retrieval, the Chinese invention application document with the publication number CN115156212A discloses a gas-elastic cleaning and airtightness test device for large-caliber marine pipe systems, "including: a short pipe, a tenon and groove flange, a quick-release locking mechanism, a hinge, an air inlet quick connector, and a pipeline connection port; a pipeline connection port is provided at the lower end of the short pipe, an air inlet quick connector is provided on the outer side, and a tenon and groove flange including a tenon face blind flange and a groove face flange is provided at the upper end; the groove face flange is fixed at the upper end of the short pipe, and a plurality of notches are evenly distributed on the edge of the tenon and groove flange; a plurality of quick-release locking mechanisms are arranged circumferentially, and the quick-release locking mechanism includes a wing nut, a swivel bolt, a pin, and a support seat. The support seat is arranged on the outer side of the short pipe, a pin is installed in the hole on the support seat, the swivel bolt is sleeved with the pin, and the swivel bolt is screwed with the wing nut to cooperate with the notch to fix the tenon and groove flange". Although the pipeline connection port also uses a Straub joint when the device is used for a pipeline without a flange, the device only considers the connection tightness and lacks the consideration of the various connection relationships required for the strength test of the flange-free pipe, and has certain limitations. Summary of the Utility Model

[0006] In order to solve the problems existing in the above-mentioned prior art, the purpose of the present utility model is to provide a flange-free pipe strength test device. This device connects the strength test pipe and the test short pipe by setting a Straub-type pipe joint, which will not cause damage to the pipe itself and can be applicable to the strength tests of flange-free thin-walled pipes and non-ferrous metal pipes; using this device for the strength test of flange-free pipes is convenient and efficient in operation, and can effectively solve the problems of the existing flange-free pipe strength tests; moreover, this device has a simple structure, low manufacturing cost, and can be reused.

[0007] To achieve the above purpose and other related purposes, the present utility model adopts the following technical solutions:

[0008] The utility model provides a flange - less pipe strength test device for a test pipe, which includes a Straub pipe joint, a connecting short pipe, a connecting plate, a bleed valve and a hydrostatic test bench. The left end and the right end of the test pipe are respectively fixedly connected to one end of a connecting short pipe through Straub pipe joints. A connecting plate is fixedly welded to the other end of the connecting short pipe. A joint is fixedly connected through the center of the outer side surface of each connecting plate. The joints on both sides are respectively connected and fixed to the hydrostatic test bench and the bleed valve. The outer diameter of the connecting short pipe, the outer diameter of the test pipe and the inner diameter of the Straub pipe joint have the same dimensional specifications.

[0009] As a preferred technical solution, the lengths of the two pipe segments of the test pipe and the connecting short pipe extending into the Straub pipe joint are the same.

[0010] As a preferred technical solution, the joint includes a first joint and a second joint. The first joint is located on the right side and the right - hand port of the first joint is connected to the hydrostatic test bench through a pressure pipe. The second joint is located on the left side and a bleed valve is installed on the left - hand port of the second joint.

[0011] As a preferred technical solution, a through - hole is provided at the center of the connecting plate, and a through - hole is provided at the center of the joint. One end is a cylindrical section and the other end is a threaded section. The cylindrical section is fixedly welded at the center of the plate surface of the connecting plate. The through - hole of the joint is concentric with the through - hole of the connecting plate.

[0012] As a preferred technical solution, the threaded section of the first joint is connected to one end of the pressure pipe, and the other end of the pressure pipe is connected to the hydrostatic test bench; the second joint is fixedly connected to the bleed valve through the threaded section.

[0013] As a preferred technical solution, the hydrostatic test bench includes a hydraulic pump, a pressure gauge, a pressure regulating valve, a pressure relief valve and related connecting pipelines.

[0014] As described above, the utility model has the following beneficial effects:

[0015] (1) The flange - less pipe strength test device of the utility model realizes the efficient connection between the strength - test pipe and the test short pipe by adopting the Straub - type pipe joint, avoids damage to the pipe itself, especially thin - wall pipes and non - ferrous metal pipes, ensures the safety of the test and the integrity of the pipe; it can be applied to the strength test of thin - wall pipes and non - ferrous metal pipes without flanges and has good practical applicability.

[0016] (2) A flange - less pipe strength test device of the present utility model is made more convenient for the strength test operation of flange - less pipes through the simplification and optimization of the structural design, greatly improving the test efficiency. Compared with the traditional flange connection method, the installation and disassembly time and labor intensity are significantly reduced.

[0017] (3) A flange - less pipe strength test device of the present utility model effectively controls the manufacturing cost through simple structural design and selection of durable materials, with a low manufacturing cost. And due to its reusable and durable characteristics, the long - term use cost is further reduced, thereby improving economic benefits and environmental friendliness. Brief Description of the Drawings

[0018] Figure 1 It is a schematic connection structure diagram when a flange - less pipe strength test device of the present utility model is in use.

[0019] Figure 2 It is a schematic cross - sectional structure diagram at the Straub pipe joint of the present utility model.

[0020] Figure 3 It is a right - view of the connecting plate on the left side and the first joint of the present utility model.

[0021] Figure 4 It is a schematic cross - sectional structure diagram of the connecting plate on the left side and the first joint of the present utility model.

[0022] Figure 5 It is a left - view of the connecting plate on the right side and the second joint of the present utility model.

[0023] Figure 6 It is a schematic cross - sectional structure diagram of the connecting plate on the right side and the second joint of the present utility model.

[0024] Among them, the specific descriptions of the reference numerals are as follows: 1, test pipe; 2, Straub pipe joint; 3, locking bolt; 4, connecting short pipe; 5, connecting plate; 6, first joint; 7, pressure pipe; 8, hydrostatic test bench; 9, second joint; 10, air release valve. Detailed Embodiments

[0025] In order to better understand the purpose, structure and function of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0026] In the description of the present utility model, it should be noted that the positional relationships indicated by terms such as "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., as cited in this specification, are based on the positional relationships shown in the drawings. These are only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific direction. Therefore, it should not be construed as a limitation to the present utility model.

[0027] Embodiment 1

[0028] As Figure 1-6 shown, this embodiment provides a flange - less pipe strength test device for a test - subject pipe 1. The device includes a Straub pipe joint 2, a connecting short pipe 4, a connecting plate 5, joints, a bleed valve 10, and a hydrostatic test bench 8.

[0029] The left and right ends of the test - subject pipe 1 are respectively fixedly connected to one end of a connecting short pipe 4 through Straub pipe joints 2. In this embodiment, the Straub pipe joint 2 is a standard part purchased from the market, with a working pressure not greater than 1.6 Mpa. Its structure will not be elaborated here. The Straub pipe joint 2 can be applied to pipes with a diameter range of φ26.9 - φ275.5 mm. The Straub pipe joints 2 are purchased according to the specifications of the test - subject pipe 1 and the quantity is 2. The inner diameter of the selected Straub pipe joint 2 is the same as the outer diameter of the test - subject pipe 1. The Straub pipe joint 2 is provided with locking bolts 3, and the Straub pipe joint 2 fastens and seals the connecting short pipe 4 and the test - subject pipe 1 through the locking bolts 3. The lengths of the two pipe segments of the test - subject pipe 1 and the connecting short pipe 4 extending into the Straub pipe joint 2 are the same. The outer diameter of the connecting short pipe 4 is the same as the outer diameter of the test - subject pipe 1.

[0030] The other end of the connecting short pipe 4 is fixedly welded with a connecting plate 5. At the center of the outer side of each connecting plate 5, a joint is fixedly connected through - hole. The joints on both sides are respectively connected and fixed to the hydrostatic test bench 8 and the bleed valve 10.

[0031] The joint includes a first joint 6 and a second joint 9. The first joint 6 is located on the right side, and the right - hand port of the first joint 6 is connected to the hydrostatic test bench 8 through a pressure pipe 7. The second joint 9 is located on the left side, and a bleed valve 10 is installed on the left - hand port of the second joint 9.

[0032] A through hole is provided at the center of the connecting plate 5, and a through hole is provided at the center of the joint. One end is a cylindrical section, and the other end is a threaded section. The cylindrical section is welded and fixed at the center of the plate surface of the connecting plate 5. The through hole of the joint is concentric with the through hole of the connecting plate 5. The threaded section of the first joint 6 is communicated with one end of the pressure pipe 7, and the other end of the pressure pipe 7 is communicated with a hydrostatic test bench. The hydrostatic test bench includes a hydraulic pump, a pressure gauge, a pressure regulating valve, a pressure relief valve and related connecting pipelines. The second joint 9 is fixedly connected with the air release valve 10 by a threaded section.

[0033] Embodiment 2

[0034] As Figure 1 shown, this embodiment provides a method for performing a strength test on a non-flanged pipe using the device in Embodiment 1, including the following steps:

[0035] Step 1: Use the pressure pipe 7, the hydrostatic test bench 8 and the joint welded with the short pipe connecting plate 5 to connect and fix.

[0036] Among them, the device is composed of a Straub pipe joint 2, a locking bolt 3, a connecting short pipe 4, a connecting plate 5, a first joint 6, a second joint 9, a pressure pipe 7 and a hydrostatic test bench 8. The connecting short pipe 4 is selected as a pipe with a diameter consistent with the specification of the pipe to be strength-tested. One end of the connecting short pipe 4 is tightly connected by a Straub pipe joint 2 using a locking bolt 3, and the number is 2. A through hole is provided at the center of the connecting plate 5, and it is fixedly connected to the other end of the connecting short pipe 4 by welding, and the number is 2. A through hole is provided at the center of the first joint 6. One end is a cylindrical section, and the other end is a threaded section. The cylindrical section is welded at the center of the connecting plate 5 to ensure that the through hole of the joint is concentric with the through hole of the connecting plate 5. The threaded section of the joint is connected to the pressure pipe 7. The pressure pipe 7 connects the joint and the hydrostatic test bench. A through hole is provided at the center of the second joint 9. One end is a cylindrical section, and the other end is a threaded section. The cylindrical section is welded at the center of the connecting plate 5 to ensure that the through hole of the joint is concentric with the through hole of the connecting plate 5. The threaded section of the joint is consistent with the air release valve 10. The hydrostatic test bench is composed of a hydraulic pump, a pressure gauge, a pressure regulating valve, a pressure relief valve and related connecting pipelines.

[0037] Step 2: Clean the two ends of the pipe under test 1 and the connection installation Straub pipe joint 2 of the two connecting short pipes 4, such as Figure 1As shown, both ends of the test tube 1 are respectively connected by Straub pipe fittings 2 and connecting short pipes 4. The connecting short pipe 4 with the second joint 9 is installed on the left side, and a vent valve 10 is installed on the second joint 9. The connecting short pipe 4 with the first joint 6 is installed on the right side, and the first joint 6 is connected to the hydrostatic test bench 8 using a pressure pipe 7. The test tube 1 and the connecting short pipe 4 are respectively inserted into one end of the pipe into the Straub pipe fitting 2, and it should be ensured that the lengths of the two pipe segments extending into the Straub pipe fitting 2 are the same. Then, the test tube 1 and the connecting short pipe 4 are connected and fixed using a locking bolt 3, as Figure 2 shown.

[0038] Step 3: Perform tube air release treatment. Open the vent valve 10, then start the power supply of the hydrostatic test bench, open the pressure regulating valve to inject water into the tube until water flows out from the vent valve 10 on the left side of the tube, and then immediately close the vent valve 10.

[0039] Step 4: Keep the pressure regulating valve open and continue to inject water into the tube. During the pressurization process, personnel should stay away from the test tube 1. If leakage is found at the tube connection during the process, the pressure regulating valve needs to be closed, the pressure relief valve is opened to release the water pressure in the pipeline, and then leakage inspection is carried out. After the leakage is eliminated, continue.

[0040] Step 5: When the water pressure is pressurized to 1.5 times the design pressure of the tube, close the pressure regulating valve, record the starting pressure of the test, and then perform pressure holding according to the requirements of the drawing.

[0041] Step 6: After the pressure holding test meets the requirements of the drawing, check and record the pressure after the test. The pressure should not drop, and it should be checked that there is no leakage in the tube.

[0042] Step 7: After the test is completed, open the pressure relief valve until the pressure gauge returns to zero. Then remove the locking bolt 3 on the Straub pipe fitting 2 and transfer the tube to the next process.

[0043] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any changes or equivalent replacements can be made to these features and embodiments by those skilled in the art without departing from the spirit and scope of the present utility model. Additionally, under the teaching of the present utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the scope protected by the present utility model.

Claims

1. A flangeless pipe strength test device, used for a test pipe (1), characterized in that: The invention comprises a Straub pipe joint (2), a connecting short pipe (4), a connecting plate (5), an air release valve (10) and a water pressure test bench (8). The left end and the right end of the test pipe (1) are respectively fixedly connected to one end of a connecting short pipe (4) through the Straub pipe joint (2). A connecting plate (5) is welded and fixed to the other end of the connecting short pipe (4). A joint is fixedly connected through the center of the outer side surface of each connecting plate (5). The joints on both sides are respectively connected and fixed to the water pressure test bench (8) and the air release valve (10). The outer diameter of the connecting short pipe (4), the outer diameter of the test pipe (1) and the inner diameter of the Straub pipe joint (2) are all consistent in size.

2. A flangeless pipe strength test device according to claim 1, characterized in that: The test tube (1) and the connecting short tube (4) extending into the Straub tube joint (2) have the same length.

3. A flangeless pipe strength test device according to claim 2, characterized in that: The joint comprises a first joint (6) and a second joint (9), wherein the first joint (6) is located on the right side and the right side port of the first joint (6) is connected to the water pressure test bench (8) through a pressure pipe (7), and the second joint (9) is located on the left side and an air release valve (10) is installed on the left side port of the second joint (9).

4. A flangeless pipe strength test device according to claim 3, characterized in that: The center of the connecting plate (5) is provided with a through circular hole, the center of the joint is provided with a through hole, one end is a cylindrical section, and the other end is a threaded section, the cylindrical section is welded and fixed at the center of the plate surface of the connecting plate (5), and the through hole of the joint is concentric with the through circular hole of the connecting plate (5).

5. A flangeless pipe strength test device according to claim 4, characterized in that: The threaded section of the first joint (6) is connected to one end of the pressure pipe (7), and the other end of the pressure pipe (7) is connected to the pressure test bench; the second joint (9) is threadedly connected and fixed to the air release valve (10) via the threaded section.

6. A flangeless pipe strength test device according to any one of claims 1 to 5, characterized in that: The water pressure test bench comprises a water pressure pump, a pressure gauge, a pressure regulating valve, a pressure relief valve and related connecting pipelines.

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