Method for calculating radius of disc for non-bonding hose production and non-bonding hose

Abstract

The invention relates to a method for calculating the radius of a disc for non-bonding hose production and a non-bonding hose, and the method comprises the following steps: S1, taking a section of skeleton layer, and measuring the maximum pitch, the minimum pitch and the position pitch of the actual skeleton layer; s2, according to the data in the step S1 and the design radius of the internal pressure sealing layer, the bending radius caused by the maximum pitch of the actual framework layer, the bending radius caused by the minimum pitch of the framework layer and the design outer radius of the internal pressure sealing layer are calculated; s3, taking the maximum value of the three as the theoretical minimum bending radius value of the disc; and S4, selecting a proper radius of the disc, wherein the value of the radius of the disc is greater than or equal to the theoretical minimum bending radius value of the disc. According to the method, the influence of the bending radius of the framework layer on the cracking of the upper disc of the internal pressure sealing layer is considered, the bending radius of the disc for producing the internal pressure sealing layer can be effectively predicted, and the method is used for helping to select a proper disc, so that the cracking of the internal pressure sealing layer in the extrusion production process is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of marine engineering, and in particular to a method for calculating the radius of a reel for producing a non-bonded hose and the non-bonded hose. Background Art

[0002] With the accelerated development of oil and gas resources on land and in the deep sea, non-adhesive flexible pipes are widely used to transport fluids such as crude oil, natural gas and water. Non-adhesive flexible pipes have good compression, tensile and corrosion resistance and can adapt to complex land and marine environments.

[0003] Non-bonded hoses are generally composed of functional structural layers such as skeleton layer, internal pressure sealing layer, pressure bearing layer, tensile layer and outer sheath layer. During the production process of hoses, the internal pressure sealing layer often cracks when winding, which is usually caused by the sensitive material and the small radius of the winding tool.

[0004] In the prior art, the influence of the skeleton layer is not considered, and the radius of the disc used in the production of the internal pressure sealing layer cannot be effectively predicted. Summary of the invention

[0005] To this end, the technical problem to be solved by the present invention is to overcome the defect that the selection of non-bonded hose reels in the prior art does not take into account the influence of the skeleton layer and cannot effectively predict the radius of the reel used for producing the internal pressure sealing layer, thereby causing the internal pressure sealing layer to crack during the extrusion production process.

[0006] In order to solve the above technical problems, the present invention provides a method for calculating the radius of a reel for producing a non-bonded hose, wherein the non-bonded hose comprises a skeleton layer and an internal pressure sealing layer, wherein the internal pressure sealing layer is coated on the outer side of the skeleton layer, and comprises the following steps: S1: Take any section of the skeleton layer and measure the maximum pitch, minimum pitch and position pitch of the actual skeleton layer; S2: According to the maximum pitch, minimum pitch and position pitch of the skeleton layer, combined with the design radius of the internal pressure sealing layer, respectively calculate the bending radius caused by the actual maximum pitch of the skeleton layer, the bending radius caused by the minimum pitch of the skeleton layer and the theoretical bending radius of the internal pressure sealing layer; S3: Compare the values ​​of the bending radius caused by the actual maximum pitch of the skeleton layer, the bending radius caused by the minimum pitch of the skeleton layer, and the theoretical bending radius of the internal pressure sealing layer, and take the maximum value of the three as the theoretical minimum bending radius value of the disc; S4: Select a suitable coil radius, and make the coil radius greater than or equal to the theoretical minimum bending radius of the coil.

[0007] In one embodiment of the present invention, when measuring the position pitch of the skeleton layer in step S1, multiple position pitches at different positions of the skeleton layer are measured and an average value is taken.

[0008] In one embodiment of the present invention, the skeleton layer is formed by rolling and interlocking a single steel strip; when actually measuring the maximum pitch and the minimum pitch of the skeleton layer in step S1, the skeleton layer needs to be disassembled to form any at least two adjacent complete S-shaped skeleton sections.

[0009] In one embodiment of the present invention, the calculation formula of the bending radius caused by the actual maximum pitch of the skeleton layer in step S2 is as follows:

[0010] in, is the designed outer radius of the internal pressure sealing layer, is the maximum pitch of the skeleton layer actually measured, The position pitch of the actual skeleton layer.

[0011] In one embodiment of the present invention, the calculation formula of the bending radius caused by the minimum pitch of the actual skeleton layer in step S2 is as follows:

[0012] in, is the designed outer radius of the internal pressure sealing layer, is the minimum pitch of the skeleton layer actually measured, The position pitch of the actual skeleton layer.

[0013] In one embodiment of the present invention, the theoretical bending radius calculation formula of the internal pressure sealing layer in step S2 is as follows:

[0014] in, is the designed outer radius of the internal pressure sealing layer, Design allowable strain for internal pressure sealing layer.

[0015] Among them, is the design outer radius of the internal pressure sealing layer, and is the design allowable strain of the internal pressure sealing layer.

[0016] In one embodiment of the present invention, in step S3, the calculation formula of the theoretical minimum bending radius of the plate is as follows:

[0017] in, The bending radius caused by the maximum pitch of the actual skeleton layer; The bending radius caused by the minimum pitch of the actual skeleton layer; is the theoretical bending radius of the internal pressure sealing layer. Among them, is the bending radius caused by the actual maximum pitch of the skeleton layer; is the bending radius caused by the actual minimum pitch of the skeleton layer; is the theoretical bending radius of the internal pressure sealing layer.

[0018] A non-bonded hose is manufactured using the method for calculating the radius of the reel for producing the non-bonded hose, and is characterized in that it also includes a pressure-bearing layer, a tensile layer and an outer sheath layer, the pressure-bearing layer is wrapped around the outside of the internal pressure sealing layer, the tensile layer is wrapped around the outside of the pressure-bearing layer, and the outer sheath layer is covered on the outside of the tensile layer.

[0019] In one embodiment of the present invention, the pressure bearing layer is a Z-section alloy steel interlocking structure.

[0020] In one embodiment of the present invention, the tensile layer is a double-layer structure, and the tensile layer material is carbon steel.

[0021] The above technical solution of the present invention has the following advantages compared with the prior art: The method for calculating the radius of a reel for producing a non-bonded hose and the non-bonded hose described in the present invention take into account the influence of the bending radius of the skeleton layer on the cracking of the upper reel of the internal pressure sealing layer, and can effectively predict the bending radius of the reel for producing the internal pressure sealing layer, so as to help select a suitable reel, thereby avoiding the cracking of the internal pressure sealing layer during the extrusion production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific embodiments of the present invention in conjunction with the accompanying drawings, wherein Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 for Figure 1 Schematic diagram of the structure of the middle skeleton layer and the internal pressure sealing layer; Figure 3 for Figure 2 Schematic diagram of the measurement structure of the mid-frame layer pitch; Explanation of the reference numerals in the specification: 1. skeleton layer; 2. internal pressure sealing layer; 3. pressure-bearing layer; 4. tensile layer; 5. outer sheath layer; 11. S-shaped skeleton section. DETAILED DESCRIPTION

[0023] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0024] Embodiment 1 Reference Figure 1-Figure 3 As shown, the present invention discloses a method for calculating the radius of a reel for producing a non-bonded hose, wherein the non-bonded hose comprises a skeleton layer 1 and an internal pressure sealing layer 2, wherein the internal pressure sealing layer 2 is coated on the outside of the skeleton layer 1, and comprises the following steps: S1: Take any section of skeleton layer 1 and measure the maximum pitch, minimum pitch and position pitch of the actual skeleton layer 1; S2: According to the maximum pitch, minimum pitch and position pitch of the skeleton layer 1 in step S1, combined with the design radius of the internal pressure sealing layer 2, the bending radius caused by the actual maximum pitch of the skeleton layer 1, the bending radius caused by the minimum pitch of the skeleton layer 1 and the theoretical bending radius of the internal pressure sealing layer 2 are calculated respectively; S3: comparing the values ​​of the bending radius caused by the actual maximum pitch of the skeleton layer 1, the bending radius caused by the minimum pitch of the skeleton layer 1 and the theoretical bending radius of the internal pressure sealing layer 2 in step 2, and taking the maximum value of the three as the theoretical minimum bending radius value of the disc; S4: Select a suitable radius of the coil so that the radius of the coil is greater than or equal to the theoretical minimum bending radius of the coil.

[0025] In step S1 of the present invention, various data of the skeleton layer 1 in the production process are first measured, and the measured data include the maximum pitch, minimum pitch and position pitch of the skeleton layer 1. The maximum pitch of the skeleton layer 1 is the distance between two adjacent S-shaped skeleton sections 11 of the skeleton layer 1 under the extreme tensile structure, and the minimum pitch of the skeleton layer 1 is the distance between two adjacent S-shaped skeleton sections 11 of the skeleton layer 1 under the compression state; the position pitch of the skeleton layer 1 is the distance between two adjacent S-shaped skeleton sections 11 of the skeleton layer 1 in the natural state during the production process.

[0026] Specific content of step S2: According to the data measured in step S1, the bending radius of the skeleton layer 1 at the maximum pitch and the minimum pitch is calculated according to the calculation formula. As for the calculation of the bending radius of the internal pressure sealing layer 2, it needs to be calculated based on the actual diameter of the skeleton tube, the thickness of the internal pressure sealing layer 2 and the material properties of the internal pressure sealing layer 2.

[0027] The calculation in step S3 will result in three sets of bending radius values. The three sets of values ​​are compared and the largest value is taken as the theoretical radius of the disc, thereby preventing the internal pressure sealing layer 2 from cracking during the extrusion production process.

[0028] Step S4 is the selection of the actual coil radius, which includes the selection of multiple different radii according to the coil production standard. In the actual selection process, the selected coil radius must not be less than the minimum bending radius of the coil in step 3.

[0029] The present invention provides a method for calculating the radius of a reel for producing a non-bonded hose, which takes into account the influence of the actual skeleton and can effectively predict the bending radius of the reel for producing the internal pressure sealing layer 2, thereby helping to select a suitable reel to avoid cracking of the internal pressure sealing layer 2 during the extrusion production process.

[0030] Furthermore, the skeleton layer 1 is formed by rolling and interlocking a single steel strip, and any two adjacent S-shaped skeleton sections 11 are interlocked and connected; when measuring the position pitch of the skeleton layer 1 in step S1, multiple position pitches at different positions of the skeleton layer 1 are measured and the average value is taken.

[0031] Specifically, when measuring the position pitch of the skeleton layer 1, the produced skeleton layer 1 can be directly measured. In order to ensure the accuracy of the calculation results, when measuring the skeleton position pitch, several sections of the skeleton layer 1 at different positions are taken for measurement, and the average value is calculated from multiple sets of data to ensure the accuracy of the position pitch measurement data and reduce the impact on subsequent calculation results.

[0032] Furthermore, the measurement of the maximum pitch and the minimum pitch of the actual skeleton layer 1 in step S1 requires disassembling the skeleton layer to form any at least two adjacent complete S-shaped skeleton cross sections 11 .

[0033] Specifically, for the measurement of the maximum pitch and the minimum pitch of the skeleton layer 1, the skeleton layer 1 needs to be disassembled, and it is ensured that the disassembled part has at least two adjacent complete S-shaped skeleton sections 11. When measuring the maximum pitch, the two adjacent S-shaped skeleton sections 11 are stretched to the extreme position, and then the value of the maximum pitch of the skeleton layer 1 is measured; on the contrary, when measuring the value of the minimum pitch of the skeleton layer 1, the two adjacent S-shaped skeleton sections 11 need to be compressed to the shortest distance.

[0034] Furthermore, the calculation formula for the bending radius caused by the maximum pitch of the actual skeleton layer 1 in step S2 is as follows:

[0035] in, is the designed outer radius of the internal pressure sealing layer 2, is the maximum pitch of the skeleton layer 1 actually measured, The actual position pitch of the skeleton layer 1. Substituting the measured data into the formula, the bending radius caused by the actual maximum pitch of the skeleton layer 1 is obtained.

[0036] Furthermore, the calculation formula for the bending radius caused by the minimum pitch of the actual skeleton layer 1 in step S2 is as follows:

[0037] in, is the designed outer radius of the internal pressure sealing layer 2, is the minimum pitch of the skeleton layer 1 actually measured, The actual position pitch of the skeleton layer 1. Substituting the measured value into the formula, the bending radius caused by the minimum pitch of the actual skeleton layer 1 is obtained.

[0038] Furthermore, the theoretical bending radius calculation formula of the internal pressure sealing layer 2 in step S2 is as follows:

[0039] in, is the designed outer radius of the internal pressure sealing layer 2, is the design allowable strain of the internal pressure sealing layer 2. According to the material properties of the internal pressure sealing layer 2, the corresponding design allowable strain value is selected and substituted into the formula.

[0040] Furthermore, in step S3, the calculation formula of the theoretical minimum bending radius of the plate is as follows:

[0041] in, is the bending radius caused by the maximum pitch of the actual skeleton layer 1; is the bending radius caused by the minimum pitch of the actual skeleton layer 1; is the theoretical bending radius of the internal pressure sealing layer 2. The three values ​​obtained by the above calculation are compared, and the largest value is selected as the theoretical minimum bending radius of the plate.

[0042] Embodiment 2 A non-bonded hose, suitable for the calculation method of the radius of the reel used for the production of the non-bonded hose, also includes a pressure-bearing layer 3, a tensile layer 4 and an outer sheath layer 5, the pressure-bearing layer 3 is wrapped around the outside of the internal pressure sealing layer 2, the tensile layer 4 is wrapped around the outside of the pressure-bearing layer 3, and the outer sheath layer 5 is covered on the outside of the tensile layer 4.

[0043] Furthermore, the pressure-bearing layer 3 is non-bondedly wrapped around the outside of the internal pressure sealing layer 2, the tensile layer 4 is non-bondedly wrapped around the outside of the pressure-bearing layer 3, and the outer sheath layer 5 is the outermost layer and is sleeved on the outside of the tensile layer 4. Similarly, the outer sheath layer 5 and the tensile layer 4 are also non-bonded.

[0044] Specifically, the skeleton layer 1 structure in the present invention is formed by rolling and interlocking a single steel strip. As a preferred embodiment of the present invention, the material of the pressure-bearing layer 3 is alloy steel, and the material of the tensile layer 4 is carbon steel, which ensures the compressive and tensile strength of the whole non-bonded hose. The material of the skeleton layer 1 is 304 stainless steel or 316L stainless steel or super duplex stainless steel, which has good corrosion resistance. The material of the internal pressure sealing layer 2 can be HDPE, PVDF or PA11, etc., and the corresponding material is selected according to the medium transported by the pipeline. The material of the outer sheath layer 5 is HDPE, MDPE or PA11.

[0045] Furthermore, the pressure-bearing layer 3 is a Z-section alloy steel interlocking structure, and during the winding process, a special angle is used for winding. The Z-section alloy steel interlocking structure has good compressive strength and strong stability, which prolongs the service life of the pipeline.

[0046] Furthermore, the tensile layer 4 is a double-layer structure. The main functions of the tensile layer 4 in the non-bonded hose adopting a double-layer structure include improving the ability to resist external mechanical damage and ensuring the application life and reliability of the pipeline.

[0047] Embodiment 3 A non-bonded hose is measured during the production process of the skeleton layer 1, and the measured data shows that the minimum pitch data of the skeleton is 27mm, the maximum pitch data is 35mm, and the position pitch data is 28mm; the design radius value of the internal pressure sealing layer 2 is 116.mm, and the design allowable strain value is 7%.

[0048] Substituting the above values ​​into the formula, we can get: 3.26m; 0.47m; 1.66m. The theoretical minimum bending radius of the reel is 3.26m, so the radius of the selected reel should not be less than 3.26m.

[0049] In summary, the present invention introduces a method for calculating the radius of a reel for producing a non-bonded hose and a non-bonded hose. Taking into account the influence of the bending radius of the skeleton layer 1 on the cracking of the reel on the internal pressure sealing layer 2, the bending radius of the reel for producing the internal pressure sealing layer 2 can be effectively predicted to help select a suitable reel, thereby avoiding the cracking of the internal pressure sealing layer 2 during the extrusion production process.

[0050] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. A method for calculating the radius of a reel for producing a non-bonded hose, wherein the non-bonded hose comprises a skeleton layer and an internal pressure sealing layer, wherein the internal pressure sealing layer is coated on the outer side of the skeleton layer, wherein: The steps include: S1: Take any section of the skeleton layer and measure the maximum pitch, minimum pitch and position pitch of the actual skeleton layer; S2: According to the maximum pitch, minimum pitch and position pitch of the skeleton layer, combined with the design radius of the internal pressure sealing layer, respectively calculate the bending radius caused by the actual maximum pitch of the skeleton layer, the bending radius caused by the minimum pitch of the skeleton layer and the theoretical bending radius of the internal pressure sealing layer; S3: Compare the values ​​of the bending radius caused by the actual maximum pitch of the skeleton layer, the bending radius caused by the minimum pitch of the skeleton layer, and the theoretical bending radius of the internal pressure sealing layer, and take the maximum value of the three as the theoretical minimum bending radius value of the disc; S4: Select a suitable coil radius, and make the coil radius greater than or equal to the theoretical minimum bending radius of the coil.

2. The method for calculating the radius of a reel for producing a non-bonded hose according to claim 1, characterized in that: When measuring the position pitch of the skeleton layer in step S1, multiple position pitches at different positions of the skeleton layer are measured and an average value is taken.

3. The method for calculating the radius of a reel for producing a non-bonded hose according to claim 1, characterized in that: The skeleton layer is formed by rolling and interlocking a single steel strip. When actually measuring the maximum pitch and the minimum pitch of the skeleton layer in step S1, the skeleton layer needs to be disassembled to form any at least two adjacent complete S-shaped skeleton sections.

4. The method for calculating the radius of a reel for producing a non-bonded hose according to claim 1, characterized in that: The calculation formula of the bending radius caused by the actual maximum pitch of the skeleton layer in step S2 is as follows: in, is the designed outer radius of the internal pressure sealing layer, is the maximum pitch of the skeleton layer actually measured, The position pitch of the actual skeleton layer.

5. The method for calculating the radius of a reel for producing a non-bonded hose according to claim 1, characterized in that: The calculation formula of the bending radius caused by the minimum pitch of the actual skeleton layer in step S2 is as follows: in, is the designed outer radius of the internal pressure sealing layer, is the minimum pitch of the skeleton layer actually measured, The position pitch of the actual skeleton layer.

6. The method for calculating the radius of a reel for producing a non-bonded hose according to claim 1, characterized in that: The calculation formula of the theoretical bending radius of the internal pressure sealing layer in step S2 is as follows: in, is the designed outer radius of the internal pressure sealing layer, Design allowable strain for internal pressure sealing layer.

7. The method for calculating the radius of a reel for producing a non-bonded hose according to any one of claims 4 to 6, characterized in that: In step S3, the calculation formula of the theoretical minimum bending radius of the plate is as follows: in, The bending radius caused by the maximum pitch of the actual skeleton layer; The bending radius caused by the minimum pitch of the actual skeleton layer; It is the theoretical bending radius of the internal pressure sealing layer.

8. A non-bonded hose, produced by the method for calculating the radius of a reel for producing a non-bonded hose according to any one of claims 1 to 7, characterized in that: It also includes a pressure-bearing layer, a tensile layer and an outer sheath layer. The pressure-bearing layer is wrapped around the outer side of the internal pressure sealing layer, the tensile layer is wrapped around the outer side of the pressure-bearing layer, and the outer sheath layer is coated on the outer side of the tensile layer.

9. The non-bonded hose according to claim 8, characterized in that: The pressure bearing layer is an interlocking structure of alloy steel with a Z-shaped cross section.

10. The non-bonded hose according to claim 8, characterized in that: The anti-tensile layer is a double-layer structure, and the anti-tensile layer material is carbon steel.

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