Design method of net size of pipeline perforation and hole size

Abstract

The present invention discloses a design method for the net size of pipeline perforation and a design method for hole size. The design method for the net size of pipeline perforation includes: determining the maximum radial displacement of the pipeline to be penetrated into the hole, wherein the maximum radial displacement is the maximum displacement along any diameter or radius of the pipeline; determining the preset construction conditions of the pipeline to be penetrated into the hole; and calculating the net size of pipeline perforation according to the maximum radial displacement of the pipeline to be penetrated into the hole and the preset construction conditions of the pipeline to be penetrated into the hole, wherein the net size of pipeline perforation is the minimum size of the outer wall of the pipeline required to be away from the hole wall of the hole. The present invention provides a design method for the net size of pipeline perforation and a design method for hole size, which can effectively avoid pipeline perforation design defects, make the hole size of nuclear power plant process pipeline as small as reasonably feasible, improve the economy and safety of nuclear power plant, and this method can also be used for the design of other industrial pipelines other than nuclear power plants.

Description

Technical Field

[0001] The invention belongs to the technical field of pipeline design, and in particular relates to a design method for the net size of pipeline perforations and a design method for hole sizes. Background Art

[0002] There are many types of process pipelines in nuclear power plants, with complex operating conditions and important safety functions. In the process of nuclear power plant pipeline design, there is no set of design methods for the net size of the holes through the structural floor or wall. The net size of the holes is often reserved unreasonably (too large or too small). If it is too large, it is necessary to open a hole. If it is too small, it will cause defects such as the inability to install the pipeline or insulation, affect the displacement of the pipeline or cannot be blocked. Repairing these defects requires subsequent hole expansion or shrinkage, or modifying the pipeline path, which will cause the cost of the nuclear power plant to increase and the construction period to increase, and will cause hidden dangers to the safe operation of the nuclear power plant. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a design method for the net size of pipeline perforations and a design method for hole size in view of the above-mentioned deficiencies in the prior art, thereby solving the problem of unreasonable net size reservation (too large or too small) of holes that often occurs in the prior art.

[0004] The technical solution adopted to solve the technical problem of the present invention is to provide a design method for the net size of pipeline perforation, including:

[0005] Determine the maximum radial displacement of the pipe to be inserted into the hole, wherein the maximum radial displacement is the maximum displacement along any diameter or radius of the pipe;

[0006] Determine the preset construction conditions of the pipe to be inserted into the hole;

[0007] According to the maximum radial displacement of the pipe to be penetrated into the hole and the preset construction conditions of the pipe to be penetrated into the hole, the net size of the pipe penetration is calculated, wherein the net size of the pipe penetration is the minimum size that the outer wall of the pipe needs to be away from the hole wall.

[0008] Preferably, the maximum radial displacement of the pipe to be inserted into the hole also includes displacement caused by earthquakes.

[0009] Preferably, the net size of the pipeline perforation is calculated based on the maximum radial displacement of the pipeline to be penetrated into the hole and the preset construction conditions of the pipeline to be penetrated into the hole, and the calculation formula is: L = Max (L1, L 施工 ),

[0010] Among them, L is the net size of the pipeline perforation, L1 is the maximum radial displacement of the pipeline to be penetrated into the hole, and L 施工 It is the minimum pipeline construction clearance required under the preset construction conditions.

[0011] Preferably, the maximum radial displacement L1 of the pipe to be inserted into the hole is in the range of 0.1 to 15 mm.

[0012] Preferably, determining the preset construction conditions for the pipe to be inserted into the hole includes: determining that the pipe to be inserted into the hole is to be subjected to insulation installation construction, and / or determining that the pipe to be inserted into the hole is to be subjected to sealing construction materials, wherein the minimum insulation installation gap required for the insulation installation construction is L2, and the minimum sealing construction material installation gap required for the sealing construction materials is L3.

[0013] Preferably, the minimum insulation installation gap L2 required for the insulation installation construction is in the range of 40 to 60 mm, and the minimum plugging construction material installation gap L3 required for the plugging construction material is in the range of 25 to 125 mm.

[0014] Preferably, determining the preset construction conditions for the pipe to be inserted into the hole includes: determining that the pipe to be inserted into the hole is to be subjected to insulation installation construction and determining that the pipe to be inserted into the hole is to be subjected to plugging construction materials.

[0015] Preferably, the net size of the pipeline perforation is calculated based on the maximum radial displacement of the pipeline to be penetrated into the hole and the preset construction conditions of the pipeline to be penetrated into the hole, and the calculation formula is: L = Max (L1, L2, L3),

[0016] Among them, L is the net size of the pipe perforation, L1 is the maximum radial displacement of the pipe to be inserted into the hole, L2 is the minimum insulation installation gap required for insulation installation construction, and L3 is the minimum sealing construction material installation gap required for sealing construction materials.

[0017] Preferably, the design method of the net size of pipeline perforation further includes: determining the tolerance, and calculating the net size of pipeline perforation according to the maximum radial displacement of the pipeline to be penetrated into the hole, the preset construction conditions of the pipeline to be penetrated into the hole, and the tolerance, wherein the calculation formula of the net size of pipeline perforation is: L = Max (L1, L 施工 )+L4,

[0018] Among them, L4 is the tolerance, which is the maximum deviation that occurs during pipeline installation.

[0019] Preferably, the tolerance L4 is in the range of 5 to 20 mm.

[0020] The present invention also provides a method for designing hole size, comprising:

[0021] The clear dimensions of the pipeline perforation are determined according to the design method of the clear dimensions of the pipeline perforation described above;

[0022] The hole size is calculated based on the net size of the pipeline perforation.

[0023] The present invention provides a design method for the net size of pipeline perforation and a design method for the hole size, which can effectively avoid pipeline perforation design defects, make the hole size of nuclear power plant process pipeline as small as reasonably feasible, improve the economy and safety of nuclear power plant, and this method can also be used for other industrial pipeline designs besides nuclear power plants. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the pipe passing through the square hole;

[0025] Figure 2 It is a schematic diagram of the structure of a pipe passing through a circular hole;

[0026] Figure 3 It is a schematic diagram of the structure of a pipe passing through a circular hole;

[0027] Figure 4 is a schematic diagram of the structure of the pipe passing through the square hole in Example 3 of the present invention;

[0028] Figure 5 It is a schematic diagram of the structure of the pipe passing through the square hole in Example 2 of the present invention.

[0029] In the figure: 1- pipe, 2- hole, 3- air duct, 4- tray, 5- other pipes. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0031] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0032] There are many forms of pipe perforation, the typical ones are listed below:

[0033] (a) If Figure 1 As shown, the pipe 1 passes through the square hole 2, and other facilities need to be arranged in the hole 2, including: an air duct 3, a tray 4, and other pipes 5.

[0034] (b) If Figure 2 As shown, the pipe 1 passes through the circular hole, and other pipes 5 need to be arranged in the hole 2.

[0035] (c) Figure 3 As shown, the pipeline 1 passes through the circular hole, and no other facilities need to be arranged in the hole 2.

[0036] (d) If Figure 4 As shown, the pipeline 1 passes through the square hole, and no other facilities need to be arranged in the hole 2.

[0037] The holes in the pipe perforations in this application are holes.

[0038] Example 1

[0039] This embodiment provides a method for designing the net size of a pipeline perforation, including:

[0040] Determine the maximum radial displacement of the pipe to be inserted into the hole, wherein the maximum radial displacement is the maximum displacement along any diameter or radius of the pipe;

[0041] Determine the preset construction conditions of the pipe to be inserted into the hole;

[0042] According to the maximum radial displacement of the pipe to be penetrated into the hole and the preset construction conditions of the pipe to be penetrated into the hole, the net size of the pipe penetration is calculated, wherein the net size of the pipe penetration is the minimum size that the outer wall of the pipe needs to be away from the hole wall.

[0043] This embodiment also provides a method for designing hole size, including:

[0044] The clear dimensions of the pipeline perforation are determined according to the design method of the clear dimensions of the pipeline perforation described above;

[0045] The hole size is calculated based on the net size of the pipeline perforation.

[0046] This embodiment provides a design method for the net size of pipeline perforation and a design method for the hole size, which can effectively avoid pipeline perforation design defects, make the hole size of nuclear power plant process pipeline as small as reasonably feasible, improve the economy and safety of nuclear power plants, and this method can also be used for other industrial pipeline designs besides nuclear power plants.

[0047] Example 2

[0048] This embodiment provides a method for designing the net size of a pipeline perforation, including:

[0049] Determine the maximum radial displacement of the pipe to be inserted into the hole, wherein the maximum radial displacement is the maximum displacement along any diameter or radius of the pipe, and the maximum radial displacement of the pipe to be inserted into the hole is L1. The maximum radial displacement of the pipe to be inserted into the hole also includes the displacement caused by earthquake;

[0050] Determine the preset construction conditions of the pipe to be inserted into the hole;

[0051] According to the maximum radial displacement of the pipe to be penetrated into the hole and the preset construction conditions of the pipe to be penetrated into the hole, the net size of the pipe penetration is calculated, and the net size of the pipe penetration is L, wherein the net size of the pipe penetration is the minimum size that the outer wall of the pipe needs to be away from the hole wall.

[0052] For the net dimension L of the pipe perforation, if the pipe is insulated, the distance from the outer wall of the insulation to the wall of the hole is calculated.

[0053] Preferably, the net size of the pipeline perforation is calculated based on the maximum radial displacement of the pipeline to be penetrated into the hole and the preset construction conditions of the pipeline to be penetrated into the hole, and the calculation formula is: L = Max (L1, L 施工 ),

[0054] Among them, L 施工 It is the minimum pipeline construction clearance required under the preset construction conditions.

[0055] Preferably, the maximum radial displacement L1 of the pipe to be inserted into the hole is in the range of 0.1 to 15 mm.

[0056] It should be noted that the maximum radial displacement L1 of the pipe to be inserted into the hole in this embodiment is 5 mm.

[0057] Preferably, determining the preset construction conditions of the pipe to be inserted into the hole includes: determining that the pipe to be inserted into the hole is to be subjected to insulation installation construction, and / or determining that the pipe to be inserted into the hole is to be subjected to plugging construction materials, wherein the minimum insulation installation gap required for the insulation installation construction is L2, and the minimum plugging construction material installation gap required for the plugging construction material is L3. The minimum plugging construction material installation gap L3 is determined according to the plugging material manufacturer's recommendation or experience value.

[0058] Preferably, the minimum insulation installation gap L2 required for the insulation installation construction is in the range of 40 to 60 mm, and the minimum plugging construction material installation gap L3 required for the plugging construction material is in the range of 25 to 125 mm.

[0059] It should be noted that the minimum insulation installation gap L2 required for the insulation installation construction in this embodiment is 50 mm, and the minimum plugging construction material installation gap L3 required for the plugging construction materials is 40 mm.

[0060] Preferably, determining the preset construction conditions for the pipe to be inserted into the hole includes: determining that the pipe to be inserted into the hole is to be subjected to insulation installation construction and determining that the pipe to be inserted into the hole is to be subjected to plugging construction materials.

[0061] Preferably, the net size of the pipeline perforation is calculated based on the maximum radial displacement of the pipeline to be penetrated into the hole and the preset construction conditions of the pipeline to be penetrated into the hole, and the calculation formula is: L=Max(L1, L2, L3).

[0062] Preferably, the design method of the net size of pipeline perforation further includes: determining the tolerance, and calculating the net size of pipeline perforation according to the maximum radial displacement of the pipeline to be penetrated into the hole, the preset construction conditions of the pipeline to be penetrated into the hole, and the tolerance, wherein the calculation formula of the net size of pipeline perforation is: L = Max (L1, L 施工 )+L4,

[0063] Among them, L4 is the tolerance, which is the maximum deviation that occurs during pipeline installation.

[0064] Preferably, the tolerance L4 is 5 to 20 mm.

[0065] It should be noted that the tolerance L4 in this embodiment is 10 mm.

[0066] This embodiment also provides a method for designing hole size, including:

[0067] The clear dimensions of the pipeline perforation are determined according to the design method of the clear dimensions of the pipeline perforation described above;

[0068] The hole size is calculated based on the net size of the pipeline perforation.

[0069] like Figure 5 As shown, specifically, in the design method of the net size of the pipeline perforation in this embodiment, determining the preset construction conditions of the pipeline to be penetrated into the hole includes: determining the insulation installation construction of the pipeline to be penetrated into the hole and determining the construction materials for plugging the pipeline to be penetrated into the hole. The formula for calculating the net size of the pipeline perforation is L=Max(L1, L 施工 )+L4, that is, L=Max(L1, L2, L3)+L4. i =Max(L1, L 施工 ).

[0070] The design principle of the design method of the pipeline perforation net size in this embodiment is as follows:

[0071] There are many types of process pipelines in nuclear power plants, and the forms of perforations are complex. The perforation size cannot be simply determined by adding a fixed value to the outer wall of the pipeline (including the thickness of the insulation layer). The net size of the pipeline perforation is related to the maximum radial displacement L1 of the pipeline to be penetrated into the hole, the minimum insulation installation gap L2 required for insulation installation construction, the minimum plugging construction material installation gap L3 required for plugging construction materials, and the tolerance L4. L1, L2, and L3 are variables, while L4 is a fixed value. L1 is used in the operation stage and is a permanent requirement; while L2 and L3 are used in the installation stage and are one-time requirements.

[0072] When the pipeline does not need to be insulated or plugged, only L1 needs to be considered;

[0073] When the pipeline needs to be insulated or plugged, L2 is selected based on installation experience, while L3 is related to the diameter of the pipeline. Since the maximum radial displacement L1 of the pipeline to be inserted into the hole is generally small, it can be seen that the installation gap required for the insulation or plugging material can envelop the maximum radial displacement of the pipeline to be inserted into the hole, so only the maximum value of the installation gap required for insulation or plugging needs to be considered. Therefore, the static size L of the outer wall of the pipeline (including the thickness of the insulation) and the hole wall is Max (L1, L2, L3) + L4. By calculating the hole size design method in this embodiment, the required hole size can be reasonably calculated, so that the hole size is as small as reasonably feasible, and the purpose of economy and safety is achieved.

[0074] Specifically, in this embodiment, a single pipe passes through a hole, and the outer diameter of the pipe is 88.9 mm. The design method of the net size of the pipe hole includes:

[0075] Determine the maximum radial displacement L1 of the pipe to be inserted into the hole to be 5 mm;

[0076] Determining the preset construction conditions for the pipe to be inserted into the hole includes: determining the insulation installation construction for the pipe to be inserted into the hole and determining the plugging construction materials for the pipe to be inserted into the hole, the minimum insulation installation gap L2 required for the insulation installation construction is 50mm, and the minimum plugging construction material installation gap L3 required for the plugging construction materials is 40mm;

[0077] Determine the tolerance L4 to be 10 mm;

[0078] The net size L of the pipe perforation is calculated according to the maximum radial displacement L1 of the pipe to be penetrated into the hole, the minimum insulation installation gap L2 required for the insulation installation construction, the minimum sealing construction material installation gap L3 required for the sealing construction material, and the tolerance L4. The calculation formula of the net size L of the pipe perforation is: L=Max(L1, L2, L3)+L4=50+10=60mm.

[0079] Specifically, the hole in this embodiment is a square hole, and a method for designing the hole size is provided, including:

[0080] The net size L of the pipeline perforation determined according to the above-mentioned design method of the net size of the pipeline perforation is 60 mm;

[0081] According to the net size of the pipeline perforation, the hole size is calculated, and the side length of the square hole = the outer diameter of the pipeline + 2×L = 88.9 + 60×2 = 208.9 mm. Usually the hole size is an integer, so a hole of 210×210 mm is used.

[0082] The holes in this embodiment use steel casings, and the steel casings have a diameter of 219 mm.

[0083] Beneficial effects of the design method of the pipeline perforation net size in this embodiment:

[0084] (1) When designing the hole size, it is necessary to consider multiple parameters such as pipeline displacement, insulation installation space, and plugging installation space, rather than a single numerical value. This can accurately design the hole size in any situation and improve the economy and safety of nuclear power plants.

[0085] (2) This design method takes tolerances into consideration so that unavoidable tolerances do not affect the installation of the pipeline.

[0086] This embodiment provides a design method for the net size of pipeline perforations and a design method for the hole size, which are applicable to various pipeline perforations in the prior art.

[0087] This embodiment provides a design method for the net size of pipeline perforation and a design method for the hole size, which can effectively avoid pipeline perforation design defects, make the hole size of nuclear power plant process pipeline as small as reasonably feasible, improve the economy and safety of nuclear power plants, and this method can also be used for other industrial pipeline designs besides nuclear power plants.

[0088] Example 3

[0089] like Figure 4 As shown, in this embodiment, a single pipe passes through a hole, the outer diameter of the pipe is 88.9 mm, and the design method of the net size of the pipe penetration includes:

[0090] Determine the maximum radial displacement L1 of the pipe to be inserted into the hole to be 5 mm;

[0091] Determine that the preset construction conditions for the pipe to be inserted into the hole do not require insulation installation construction and plugging construction materials;

[0092] Determine the tolerance L4 to be 10 mm;

[0093] The net dimension L of the pipeline perforation is calculated based on the maximum radial displacement L1 and tolerance L4 of the pipeline to be penetrated into the hole. The calculation formula of the net dimension L of the pipeline perforation is: L = Max (L1, L 施工 )+L4, that is, L=Max(L1)+L4=5+10=15mm. i =Max(L1, L 施工 ).

[0094] L=Max(L1)+L4=5+10=15mm.

[0095] Specifically, the hole in this embodiment is a square hole, and a method for designing the hole size is provided, including:

[0096] The net size L of the pipeline perforation determined according to the above-mentioned design method of the net size of the pipeline perforation is 15 mm;

[0097] According to the net size of the pipe perforation, the hole size is calculated, and the side length of the square hole = the outer diameter of the pipe + 2×L = 88.9 + 15×2 = 118.9 mm. Usually the hole size is an integer, so only a 120×120 mm hole is required.

[0098] The holes in this embodiment are provided with casings, and the steel casings are provided with casings with a diameter of 123.9 mm.

[0099] This embodiment provides a design method for the net size of pipeline perforation and a design method for the hole size, which can effectively avoid pipeline perforation design defects, make the hole size of nuclear power plant process pipeline as small as reasonably feasible, improve the economy and safety of nuclear power plants, and this method can also be used for other industrial pipeline designs besides nuclear power plants.

[0100] Example 4

[0101] This embodiment provides a design method for the net size of pipeline perforation, which is different from the design method for the net size of pipeline perforation in Embodiment 2 in that:

[0102] In this embodiment, the maximum radial displacement L1 of the pipe to be inserted into the hole is in the range of 0.1 mm.

[0103] In this embodiment, the minimum insulation installation gap L2 required for the insulation installation construction is 60 mm, and the minimum plugging construction material installation gap L3 required for the plugging construction material is 25 mm.

[0104] In this embodiment, the range of tolerance L4 is 5 mm.

[0105] This embodiment provides a design method for the net size of pipeline perforation and a design method for the hole size, which can effectively avoid pipeline perforation design defects, make the hole size of nuclear power plant process pipeline as small as reasonably feasible, improve the economy and safety of nuclear power plants, and this method can also be used for other industrial pipeline designs besides nuclear power plants.

[0106] Example 5

[0107] This embodiment provides a design method for the net size of pipeline perforation, which is different from the design method for the net size of pipeline perforation in Embodiment 2 in that:

[0108] In this embodiment, the maximum radial displacement L1 of the pipe to be inserted into the hole is in the range of 15 mm.

[0109] In this embodiment, the minimum insulation installation gap L2 required for the insulation installation construction is 40 mm, and the minimum plugging construction material installation gap L3 required for the plugging construction material is 125 mm.

[0110] In this embodiment, the range of tolerance L4 is 20 mm.

[0111] This embodiment provides a design method for the net size of pipeline perforation and a design method for the hole size, which can effectively avoid pipeline perforation design defects, make the hole size of nuclear power plant process pipeline as small as reasonably feasible, improve the economy and safety of nuclear power plants, and this method can also be used for other industrial pipeline designs besides nuclear power plants.

[0112] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A design method for the net size of pipeline perforation, characterized in that: include: Determine the maximum radial displacement of the pipe to be inserted into the hole, wherein the maximum radial displacement is the maximum displacement along any diameter or radius of the pipe; Determining the preset construction conditions of the pipe to be inserted into the hole, including: determining that the pipe to be inserted into the hole is to be subjected to insulation installation construction, and / or determining that the pipe to be inserted into the hole is to be subjected to plugging construction materials, wherein the minimum insulation installation gap required for the insulation installation construction is L2, and the minimum plugging construction material installation gap required for the plugging construction materials is L3; According to the maximum radial displacement of the pipe to be inserted into the hole and the preset construction conditions of the pipe to be inserted into the hole, the net size of the pipe hole is calculated, where the net size of the pipe hole is the minimum size of the outer wall of the pipe from the hole wall, and the calculation formula is: L = Max (L1, L 施工 ), Among them, L is the net size of the pipeline perforation, L1 is the maximum radial displacement of the pipeline to be penetrated into the hole, and L 施工 It is the minimum pipeline construction clearance required under the preset construction conditions.

2. The design method of pipeline perforation net size according to claim 1 is characterized in that: The maximum radial displacement of the pipe to be inserted into the hole also includes the displacement caused by earthquakes.

3. The design method of pipeline perforation net size according to claim 1 is characterized in that: The maximum radial displacement L1 of the pipe to be inserted into the hole ranges from 0.1 to 15 mm.

4. The design method of pipeline perforation net size according to claim 1 is characterized in that: The minimum insulation installation gap L2 required for the insulation installation construction is in the range of 40 to 60 mm, and the minimum plugging construction material installation gap L3 required for the plugging construction materials is in the range of 25 to 125 mm.

5. The design method of pipeline perforation net size according to claim 1 is characterized in that: The net size of the pipeline perforation is calculated according to the maximum radial displacement of the pipeline to be penetrated into the hole and the preset construction conditions of the pipeline to be penetrated into the hole, and the calculation formula is: L = Max (L1, L2, L3), Among them, L is the net size of the pipe perforation, L1 is the maximum radial displacement of the pipe to be inserted into the hole, L2 is the minimum insulation installation gap required for insulation installation construction, and L3 is the minimum sealing construction material installation gap required for sealing construction materials.

6. The design method of pipeline perforation net size according to any one of claims 3, 4 and 5, characterized in that: Also includes: Determine the tolerance, and calculate the net size of the pipeline perforation according to the maximum radial displacement of the pipeline to be inserted into the hole, the preset construction conditions of the pipeline to be inserted into the hole, and the tolerance. The calculation formula for the net size of the pipeline perforation is: L = Max (L1, L 施工 )+L4, Among them, L4 is the tolerance, which is the maximum deviation that occurs during pipeline installation.

7. A method for designing hole size, characterized in that: include: The net size of the pipeline perforation determined by the design method of the net size of the pipeline perforation according to any one of claims 1 to 6; The hole size is calculated based on the net size of the pipeline perforation.

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