CN101698275A - Mold manufacturing method for high-acidity gas-field elbow heat insulation blocks - Google Patents
Mold manufacturing method for high-acidity gas-field elbow heat insulation blocks Download PDFInfo
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- CN101698275A CN101698275A CN200910216059A CN200910216059A CN101698275A CN 101698275 A CN101698275 A CN 101698275A CN 200910216059 A CN200910216059 A CN 200910216059A CN 200910216059 A CN200910216059 A CN 200910216059A CN 101698275 A CN101698275 A CN 101698275A
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Abstract
The invention discloses a mold manufacturing method for high-acidity gas-field elbow heat insulation blocks, which relates to the technical field of mold manufacturing processes for elbows in anti-corrosion heat-insulation materials of oil/gas field gathering pipelines. In order to manufacture a mold for elbow heat insulation blocks, the method adopts a plurality of steps of: a, choosing a straight steel pipe; b, segmenting the steel pipe; c, welding the mold; d, treating the inner and outer walls of the mold; and the like. The method is simple in steps and can enable the roundness of the mold to meet design requirements so as to ensure the uniform thickness of the heat insulation blocks processed. The mold is convenient to operate and good in air tightness.
Description
Technical field
The present invention relates to elbow module manufacture craft technical field in the oil gas field gathering line anti-corrosive thermal insulation material, it is big exactly to relate to a kind of sulfur content that is applicable to, the oil gas field that gas humidity is big, the preparation method of the elbow heat insulating block mould in the pipeline construction that carries out gas field pilot production ground surface works, inner gathering engineering, purified gas gathering engineering, natural gas purification factory engineering etc.
Background technology
For quick development of fields, in implementing the oil gas well drilling process, be about to begin and build the gathering line of oil gas field, for some not hydrogen sulfide containing oil gas fields, when the construction technique pipeline, as long as gathering line is carried out just can being used for the construction of pipeline after the preliminary treatment, but, just can not simple process the oil gas field that runs into the crude oil that contains hydrogen sulfide and natural gas, particularly some sulfur content are big, the oil gas field that gas humidity is big is carrying out gas field pilot production ground surface works, inner gathering engineering, the purified gas gathering engineering, during the pipeline construction of natural gas purification factory engineering etc.Corrosion-proof technology for pipeline is the winding of steel pipe being carried out 3 layers of anticorrosion band of PE preferably at present, and then make heat insulating block pipeline is implemented insulation, solve wet sulfur-containing gas produces aqueous water in course of conveying problem jointly, avoid the sulfide reaction in water and the pumped (conveying) medium to form sulfurous acid, cause steel pipe to be corroded.As seen, can the making quality of heat insulating block be solve a vital ring in the problem of " it is big to run into sulfur content; the oil gas field that gas humidity is big, at the pipeline construction that carries out gas field pilot production ground surface works, inner gathering engineering, purified gas gathering engineering, natural gas purification factory engineering etc. ".But straight tube and bend pipe are incubated, particularly in the manufacturing process of the heat insulating block of bend pipe at present,, because flexibility wider range of bend pipe, from 5 °～90 °, cause the manufacture difficulty of elbow heat insulating block big, and do not have suitable elbow module to be used for making the elbow heat insulating block at present.
Summary of the invention
For solving the problems of the technologies described above, it is big to the present invention proposes a kind of sulfur content that is applicable to, the oil gas field that gas humidity is big, the preparation method of the mould of required elbow heat insulating block in the pipeline construction that carries out gas field pilot production ground surface works, inner gathering engineering, purified gas gathering engineering, natural gas purification factory engineering etc., this method step is simple, and adopt this method to make mould, thereby the circularity that can make mould reaches designing requirement guarantees that the heat insulating block thickness that processes is even, Mould operation is convenient, good leak tightness.
This method is achieved through the following technical solutions:
A kind of mould making method of high-acidity gas-field elbow heat insulation blocks is characterized in that step is as follows:
A, straight steel pipe are selected,
According to the external diameter of elbow and the thickness of required heat insulating block, adopt formula 1 to calculate the internal diameter of mould, the wall thickness of mould internal diameter and selected mould is determined the specifications and models of the steel pipe of making mould, and the straight steel pipe wall thickness of making mould is 8～10mm, external diameter big steel pipe, corresponding wall thickness select to want thicker;
Formula 1: the internal diameter of mould=(steel pipe caliber+2 * anticorrosive coat thickness+2 * insulation layer thickness+2 * overcoat thickness), wherein, anticorrosive coat thickness refers to the thickness of anticorrosive coat of the steel pipe of insulation; Insulation layer thickness refers to the thickness of heat-insulation layer of the design of insulation anti-corrosion pipe; Overcoat thickness refers to the thickness of the overcoat of insulating tube, and unit is mm;
Cutting apart of b, steel pipe,
Calculate the radius of curvature of mould according to the radius of curvature of elbow, the curvature radius formula of elbow is: R=5DN, and wherein, R represents the radius of curvature of elbow, and DN represents the nominal diameter of elbow, and the radius of curvature of mould is identical with the radius of curvature of elbow;
Go out the length of the interior outer arc of mould according to the length computation of the interior outer arc of elbow; Outer arc length L
1=r
1* θ, wherein, r
1Be mold radius+steel pipe radius, θ is the radian of elbow; Interior arc length L
2=r
2* θ, wherein, r
2Be mold radius-steel pipe radius, θ is the radian of elbow;
Inside and outside arc length according to mould is cut apart selected straight steel pipe, guarantee that several sections camber lines of cutting apart can be similar to see and be in line, and is identical with the radius of curvature of the radius of curvature of guaranteeing the mould behind the assembly welding and elbow.
The welding of c, mould will be cut apart the various piece in the good straight steel pipe, be welded into the required bend pipe of elbow module, and the mode of taking in the welding process to be symmetrically welded is welded the described various piece of cutting apart in the good straight steel pipe, thereby forms die blank;
The inside and outside wall of d, mould is handled, and after the segmentation welding, die blank inside and outside wall weld seam is polished, and guarantees that the inside and outside wall of mould is smooth;
The seal of e, mould and fastness are handled, and in the both mold ends portion after the d step sealing ring are set, and the snap close of fixed mould is set on mould.
Advantage of the present invention shows:
Compared with prior art, the steps such as abcde that the present invention adopts, be particularly useful for sulfur content big, the oil gas field that gas humidity is big, the making of the mould of required elbow heat insulating block in the pipeline construction that carries out gas field pilot production ground surface works, inner gathering engineering, purified gas gathering engineering, natural gas purification factory engineering etc., this method step is simple, and adopt this method to make mould, thereby the circularity that can make mould reaches designing requirement guarantees that the heat insulating block thickness that processes is even, Mould operation is convenient, good leak tightness.
The present invention adopts the method that is symmetrically welded, and has guaranteed that the circularity of mould reaches requirement, thereby has made the thickness of heat insulating block more even.
After the segmentation welding, mould inside and outside wall weld seam is polished, guaranteed that the mould surfaces externally and internally is smooth, solved the rough phenomenon of heat insulating block of dried shrimp waist overlap joint.
Description of drawings
The present invention is described in further detail below in conjunction with specification drawings and specific embodiments, wherein:
Fig. 1 is the mould structure schematic diagram of producing
Fig. 2 is in the b step, the schematic diagram that selected straight steel pipe is cut apart
The die blank structural representation of Fig. 3 for forming in the c step
The specific embodiment
Embodiment 1
With reference to Figure of description 1 and 2, the invention discloses a kind of mould making method of high-acidity gas-field elbow heat insulation blocks, step is as follows:
A, straight steel pipe are selected,
According to the external diameter of elbow and the thickness of required heat insulating block, adopt formula 1 to calculate the internal diameter of mould, the wall thickness of mould internal diameter and selected mould is determined the specifications and models of the steel pipe of making mould, and the straight steel pipe wall thickness of making mould is 8～10mm, external diameter big steel pipe, corresponding wall thickness select to want thicker;
Formula 1: the internal diameter of mould=(steel pipe caliber+2 * anticorrosive coat thickness+2 * insulation layer thickness+2 * overcoat thickness), wherein, anticorrosive coat thickness refers to the thickness of anticorrosive coat of the steel pipe of insulation; Insulation layer thickness refers to the thickness of heat-insulation layer of the design of insulation anti-corrosion pipe; Overcoat thickness refers to the thickness of the overcoat of insulating tube, and unit is mm;
Cutting apart of b, steel pipe,
Calculate the radius of curvature of mould according to the radius of curvature of elbow, the curvature radius formula of elbow is: R=5DN, and wherein, R represents the radius of curvature of elbow, and DN represents the nominal diameter of elbow, and the radius of curvature of mould is identical with the radius of curvature of elbow;
Go out the length of the interior outer arc of mould according to the length computation of the interior outer arc of elbow; Outer arc length L
1=r
1* θ, wherein, r
1Be mold radius+steel pipe radius, θ is the radian of elbow; Interior arc length L
2=r
2* θ, wherein, r
2Be mold radius-steel pipe radius, θ is the radian of elbow;
Inside and outside arc length according to mould is cut apart selected straight steel pipe, guarantee that several sections camber lines of cutting apart can be similar to see and be in line, and is identical with the radius of curvature of the radius of curvature of guaranteeing the mould behind the assembly welding and elbow.
The welding of c, mould will be cut apart the various piece in the good straight steel pipe, be welded into the required bend pipe of elbow module, and the mode of taking in the welding process to be symmetrically welded is welded the described various piece of cutting apart in the good straight steel pipe, thereby forms die blank;
The inside and outside wall of d, mould is handled, and after the segmentation welding, die blank inside and outside wall weld seam is polished, and guarantees that the inside and outside wall of mould is smooth;
On the basis of embodiment 1, also have the following steps after the d step: the seal of mould and fastness are handled, and in the both mold ends portion after the d step sealing ring 1 are set, and the snap close 2 of fixed mould is set on mould.
1, steel pipe is selected
Because (for example: circularity is not enough for the limitation of the performance of elbow own, simmer in the process of system elbow at straight tube, the circularity local deformation that can cause straight tube is for oval, and local oval-shaped mould will certainly cause the in uneven thickness of heat insulating block), thus by after straight tube is cut apart again the mode of assembly welding make mould.
At the elbow of φ 406.4, having chosen wall thickness according to existing steel pipe is 6mm, and 10mm, 12mm steel pipe carry out mould trial-production and do.The steel pipe that 6mm is thick in use deforms easily, and the operation inconvenience when using of the thick steel pipe of 12mm, mould is heavier, so finally select the thick steel pipe manufacturing mould of 10mm.
2. mold radius determines
At first according to the external diameter of elbow and the thickness of heat insulating block, calculate internal diameter=(the steel pipe caliber+2 * anticorrosive coat thickness+2 * insulation layer thickness+2 * overcoat thickness) of mould, wherein, anticorrosive coat thickness refers to the thickness of anticorrosive coat of the steel pipe of insulation; Insulation layer thickness refers to the thickness of heat-insulation layer of the design of insulation anti-corrosion pipe; Overcoat thickness refers to the thickness of the overcoat of insulating tube, and unit is mm, and the straight tube that this engineering is chosen φ 508 * 10mm to φ 406.4 elbows just can meet the demands.
And then according to the radius of curvature of φ 406.4 elbows calculate mould radius (R=5DN, wherein, R represents the radius of curvature of elbow, DN represents the nominal diameter of elbow, the radius of curvature of mould is identical with the radius of curvature of elbow; ).
Go out at last the length (reserving the heat affected area) of the interior outer arc of mould according to designing requirement according to the length computation of the interior outer arc of φ 406.4 elbows, mould is cut apart, guaranteeing that several sections camber lines of cutting apart can be similar to sees and is in line, radius of curvature with the radius of curvature of guaranteeing the mould behind the assembly welding and elbow is identical, through test repeatedly, we are divided into 6 parts, as shown in Figure 2.
3. the welding of mould
According to top calculating, straight tube is carried out blanking according to predetermined design.And it is cut: AB piece as shown in Figure 2 and CD piece.To note the direction (see figure 3) in the time of the segmentation welding, weld again, in welding process, can not change, take the method that is symmetrically welded in order to ensure radius of curvature.The circularity of having guaranteed mould reaches requirement, thereby makes the thickness of heat insulating block more even.
4. the inside and outside wall of mould is handled
After the segmentation welding, mould inside and outside wall weld seam is polished, guarantee that the mould surfaces externally and internally is smooth, solved the rough phenomenon of heat insulating block of dried shrimp waist overlap joint, after mould takes off, the smooth in appearance of heat insulating block, the smooth Expected Results that reached.Operating personnel directly are divided into two heat insulating block with cutter, have simplified and have made male and female operation, have improved efficient.
5. the seal of mould
In order to ensure the seal of foaming mould, reduce the waste of AB material, in both mold ends sealing ring 1 is installed, below mould, install and fix snap close 2, guaranteed the seal and the fastness of mould.
Conclusion: make processed mould by above 5 steps and guaranteed the construction needs, Mould operation is convenient, good leak tightness, and the thickness of heat insulating block is even, and smooth in appearance has reached predetermined target.
Claims (2)
1. the mould making method of a high-acidity gas-field elbow heat insulation blocks is characterized in that step is as follows:
A, straight steel pipe are selected,
According to the external diameter of elbow and the thickness of required heat insulating block, adopt formula 1 to calculate the internal diameter of mould, the wall thickness of mould internal diameter and selected mould is determined the specifications and models of the steel pipe of making mould, the straight steel pipe wall thickness of making mould is 8～10mm;
Formula 1: the internal diameter of mould=(steel pipe caliber+2 * anticorrosive coat thickness+2 * insulation layer thickness+2 * overcoat thickness), wherein, anticorrosive coat thickness refers to the thickness of anticorrosive coat of the steel pipe of insulation; Insulation layer thickness refers to the thickness of heat-insulation layer of the design of insulation anti-corrosion pipe; Overcoat thickness refers to the thickness of the overcoat of insulating tube, and unit is mm;
Cutting apart of b, steel pipe,
Calculate the radius of curvature of mould according to the radius of curvature of elbow, the curvature radius formula of elbow is: R=5DN, and wherein, R represents the radius of curvature of elbow, and DN represents the nominal diameter of elbow, and the radius of curvature of mould is identical with the radius of curvature of elbow;
Go out the length of the interior outer arc of mould according to the length computation of the interior outer arc of elbow; Outer arc length L
1=r
1* θ, wherein, r
1Be mold radius+steel pipe radius, θ is the radian of elbow; Interior arc length L
2=r
2* θ, wherein, r
2Be mold radius-steel pipe radius, θ is the radian of elbow;
Inside and outside arc length according to mould is cut apart selected straight steel pipe, guarantee that several sections camber lines of cutting apart can be similar to see and be in line, and is identical with the radius of curvature of the radius of curvature of guaranteeing the mould behind the assembly welding and elbow
The welding of c, mould will be cut apart the various piece in the good straight steel pipe, be welded into the required bend pipe of elbow module, and the mode of taking in the welding process to be symmetrically welded is welded the described various piece of cutting apart in the good straight steel pipe, thereby forms die blank;
The inside and outside wall of d, mould is handled, and after the segmentation welding, die blank inside and outside wall weld seam is polished, and guarantees that the inside and outside wall of mould is smooth, forms mould.
2. the mould making method of high-acidity gas-field elbow heat insulation blocks according to claim 1, it is characterized in that: also have following treatment step after the d step: the seal of mould and fastness are handled, in the both mold ends portion after the d step sealing ring (1) is set, the snap close (2) of fixed mould is set on mould.
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|---|---|---|---|
| CN2009102160593A CN101698275B (en) | 2009-10-30 | 2009-10-30 | Mold manufacturing method for high-acidity gas-field elbow heat insulation blocks |
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| CN101698275B CN101698275B (en) | 2011-01-26 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102059514A (en) * | 2010-11-24 | 2011-05-18 | 安徽富煌钢构股份有限公司 | Processing method of small-curvature and small-angle bent pipe |
| CN111120063A (en) * | 2019-12-26 | 2020-05-08 | 东风越野车有限公司 | Forming process of special-shaped heat shield for exhaust tail pipe of off-road vehicle and heat shield |
-
2009
- 2009-10-30 CN CN2009102160593A patent/CN101698275B/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102059514A (en) * | 2010-11-24 | 2011-05-18 | 安徽富煌钢构股份有限公司 | Processing method of small-curvature and small-angle bent pipe |
| CN102059514B (en) * | 2010-11-24 | 2012-05-23 | 安徽富煌钢构股份有限公司 | Processing method of small-curvature and small-angle bent pipe |
| CN111120063A (en) * | 2019-12-26 | 2020-05-08 | 东风越野车有限公司 | Forming process of special-shaped heat shield for exhaust tail pipe of off-road vehicle and heat shield |
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| Publication number | Publication date |
|---|---|
| CN101698275B (en) | 2011-01-26 |
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