CN108202203B - Online under-pressure tapping method for composite plate pressure-bearing equipment - Google Patents
Online under-pressure tapping method for composite plate pressure-bearing equipment Download PDFInfo
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- CN108202203B CN108202203B CN201611168929.0A CN201611168929A CN108202203B CN 108202203 B CN108202203 B CN 108202203B CN 201611168929 A CN201611168929 A CN 201611168929A CN 108202203 B CN108202203 B CN 108202203B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
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Abstract
The invention provides an online under-pressure tapping method for composite plate pressure-bearing equipment, which comprises the following steps: firstly, the method comprises the following steps: cutting off a part of the equipment base layer under the condition of not damaging the equipment composite layer; II, secondly: vertically welding the connecting pipe with the pressure hole on the exposed surface of the equipment multilayer, forming a multilayer welding part between the connecting pipe with the pressure hole and the equipment multilayer by welding, and performing dye penetrant inspection; thirdly, the method comprises the following steps: welding a layer of transition welding part on the multilayer welding part; fourthly, the method comprises the following steps: welding a base layer welding part between the equipment base layer and the connecting pipe with the pressure hole and on the transition welding part, and performing dye penetrant inspection; fifthly: and (4) punching holes on the equipment multilayer with pressure through the welded connecting pipe with the holes punched with pressure. According to the invention, by cutting the equipment base layer of the composite board, welding the connecting pipe with the hole opened under pressure on the equipment composite layer, and then opening the hole under pressure, the problems that the process medium is easy to enter the gap of the composite board, corrosion is caused and the like due to the fact that the hole is directly opened on the equipment are solved, and the method has the characteristics of simplicity in operation and high reliability.
Description
Technical Field
The invention relates to the technical field of maintenance of pressure-bearing equipment, in particular to an online under-pressure tapping method for composite plate pressure-bearing equipment with an inner layer made of stainless steel.
Background
In the petroleum petrochemical device, a plurality of composite plate pressure-bearing devices with carbon steel as a base layer and stainless steel as a composite layer are adopted, however, in the operation process of the device, because of the process and the operation and maintenance reasons, the holes are always required to be opened under the online pressure.
Generally, composite plate materials adopted by pressure equipment are produced by an explosion cladding process, but a tiny gap exists between base carbon steel and clad stainless steel, and if an online hole opening method is not proper, a process medium can gradually penetrate into the gap, so that the base carbon steel is damaged, and even a safety accident is induced.
In view of this, the inventor of the present invention provides an online under-pressure tapping method for composite plate pressure-bearing equipment, which is simple to operate, safe and reliable.
Disclosure of Invention
The invention mainly aims to provide a safe and reliable online pressure tapping method for composite plate pressure-bearing equipment, which can effectively prevent process media from entering gaps of a composite plate interlayer after tapping.
In order to achieve the aim, the invention provides an online pressure tapping method for composite plate pressure-bearing equipment, wherein an equipment compound layer covers the composite plate pressure-bearing equipment, and an equipment base layer covers the equipment compound layer; the online under-pressure tapping method comprises the following steps:
the method comprises the following steps: online trompil of basic unit
Cutting off a part of the equipment base layer under the condition of not damaging the equipment composite layer;
step two: multilayer welding
Vertically welding the connecting pipe with the pressure hole on the exposed surface of the equipment multilayer, forming a multilayer welding part between the connecting pipe with the pressure hole and the equipment multilayer by welding, and performing dye penetrant inspection;
step three: welding of transition layer
Welding a layer of transition welding part on the multilayer welding part;
step four: base layer welding
Welding a base layer welding part between the equipment base layer and the connecting pipe with the pressure hole and on the transition welding part, and performing dye penetrant inspection;
step five: on-line pressure tapping
And (4) punching holes on the equipment multilayer with pressure through the welded connecting pipe with the holes punched with pressure.
The online pressure tapping method of the composite plate pressure-bearing equipment is characterized in that the material of the multilayer welding part and the material of the multilayer of the equipment are both stainless steel.
The online pressure tapping method of the composite plate pressure-bearing equipment is characterized in that the material of the welding part of the base layer and the material of the equipment base layer are both carbon steel.
The online pressure tapping method of the composite plate pressure-bearing equipment is characterized in that the material of the adapter tube with the pressure tapping and the equipment composite layer are both stainless steel.
The online pressure tapping method of the composite plate pressure-bearing equipment comprises the step one of cutting a circular hole on an equipment base layer by adopting an oxygen-propane gas cutting process, wherein the diameter of the circular hole is larger than the outer diameter of a pressure tapping pipe.
The online pressure tapping method of the composite plate pressure-bearing equipment is characterized in that the hole wall of the round hole is subjected to gradient treatment to form a conical hole.
The online pressure tapping method of the composite plate pressure-bearing equipment is characterized in that the included angle between the hole wall of the conical hole and the equipment composite layer is α and is equal to 45 degrees.
The online pressure tapping method of the composite plate pressure-bearing equipment is characterized in that an included angle is formed between the end part of the pipe wall of the pressure-tapped connecting pipe and the axial direction of the connecting pipe, and the included angle is equal to 45 degrees.
The online pressure tapping method of the composite plate pressure-bearing equipment is characterized in that the composite layer welding portion is made of an A022 welding rod, the transition welding portion is made of an A042 welding rod, and the base layer welding portion is made of an A302 welding rod.
And in the second step, a multi-layer and multi-channel non-swing rapid welding method is adopted to weld the pipe joint of the connecting pipe with the pressure hole on the equipment compound layer.
The invention has the beneficial effects that: through cutting the equipment base layer of the composite board, welding the connecting pipe with the pressure hole on the equipment clad layer, and then pressing the hole, the problems that the process medium is easy to enter the gap of the composite board, corrosion and the like caused by directly punching the hole on the equipment are avoided. The method can be applied to the online maintenance of the composite board pressure-bearing equipment.
Drawings
The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings. Wherein:
fig. 1 is a schematic view of an online belt pressure tapping method of a composite plate pressure bearing device according to the present invention.
Description of reference numerals: 1-equipment base layer; 2-a connecting pipe with a hole; 3-equipment multilayer; 4-multilayer welding part; 5-base layer weld; 6-transition weld; 7-composite board bearing equipment.
In the drawings, like parts are provided with like reference numerals. The drawings are not to scale.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 1, the present invention provides an online pressure tapping method for composite plate pressure-bearing equipment, wherein an equipment composite layer 3 covers the composite plate pressure-bearing equipment 7, and an equipment base layer 1 covers the equipment composite layer 3. Typically, the material of the device cover layer 3 is stainless steel and is therefore also referred to as a stainless steel layer, while the material of the device base layer 1 is carbon steel and is therefore also referred to as a carbon steel layer.
In the preferred embodiment, the material of the device base layer 1 is Q245R (carbon steel) with a thickness of 14mm, and the material of the device cover layer 3 is 00Cr17Ni14Mo2(stainless steel), the thickness is 3mm, the size of the connecting pipe 2 with tap hole is Φ 114 × 8.5mm (outer diameter × wall thickness), and the pipe wall end of the connecting pipe 2 with tap hole has an angle (90 ° - α) with the axial direction of the connecting pipe 2, it should be noted that fig. 1 only shows the pipe wall of the connecting pipe 2 with tap hole, on the basis of this embodiment, the online tap hole method of the pressure equipment for composite boards proposed by the present invention is described with reference to fig. 1, which has the following steps:
the method comprises the following steps: online trompil of basic unit
According to the size of the adapter 2 with the pressure hole and the material requirement of the equipment composite layer 3, the cutting temperature is controlled, and a part of the equipment base layer 1 is cut without damaging the equipment composite layer 3.
Specifically, an oxygen-propane gas cutting process can be adopted to cut a round hole with phi of 120 +/-3 mm on the equipment base layer 1, and the process can safely cut off the carbon steel material (Q245R) of the equipment base layer 1 without damaging the stainless steel material (00 Cr) of the equipment clad layer 317Ni14Mo2) The diameter of the round hole is larger than the outer diameter of the adapter 2 with the pressure tapping, then the hole wall of the round hole is subjected to gradient processing to form a conical hole, so that the adapter 2 with the pressure tapping is convenient to install, the included angle between the hole wall of the conical hole and the equipment composite layer 3 is α, preferably α is equal to 45 degrees, but not limited to the angle.
Step two: multilayer welding
The surface of the equipment compound layer 3 exposed through the cutting equipment base layer 1 is cleaned until the welding requirement is met, then the connecting pipe 2 with the pressure hole is vertically welded on the exposed surface of the equipment compound layer 3, the compound layer welding part 4 is formed between the connecting pipe 2 with the pressure hole and the equipment compound layer 3 through welding, and the coloring flaw detection is carried out, the overproof defect is eliminated, and the welding defect which can cause material leakage is ensured to be absent.
Preferably, the material of the multi-layer welding part 4 is similar to or identical to that of the equipment multi-layer 3 (both stainless steel), and the material of the connecting pipe 2 with the tap hole is similar to or identical to that of the equipment multi-layer 3 (both stainless steel).
Preferably, the multilayer welding part 4 adopts an A022 stainless steel welding rod, adopts a multilayer multi-channel non-swing rapid welding method according to the requirements of GB/T8165-1997 stainless steel clad steel plates and steel strips and GB/T13148-2008 stainless steel clad steel plate welding technical requirements, controls small heat input and current, and enables 00Cr to be welded on the surface of the stainless steel clad steel plate through the method17Ni14Mo2The pipe joint of the material connecting pipe 2 with the hole is welded on the equipment composite layer 3.
Step three: welding of transition layer
A transition weld 6 is welded to the multi-layer weld 4. Under the condition of ensuring the penetration of the weld, a small-diameter welding rod is adopted as much as possible, and the straight-line welding is carried out by adopting small-specification reverse polarity so as to reduce the dilution of the base layer to the welding seam of the transition layer.
Preferably, the transition welding part 6 is made of A042 welding rod (ultra-low carbon stainless steel welding rod).
Step four: base layer welding
And welding a base welding part 5 between the equipment base layer 1 and the connecting pipe 2 with the pressure hole and on the transition welding part 6, performing dye penetrant inspection, and eliminating the overproof defects. The transition welding part 6 plays a transition role, and the base welding part 5 and the multi-layer welding part 4 which are made of different materials can be better connected together.
Preferably, the substrate welding portion 5 is selected from an a302 welding rod (closer to the material of the device substrate 1).
Step five: on-line pressure tapping
The welded connecting pipe 2 with the hole is provided with the hole under pressure according to the conventional hole under pressure forming process, the device composite layer 3 is provided with the hole under pressure, and the operation procedure meets the requirements of SY6554-2011 'safety standard for hole forming operation under pressure in petroleum industry'.
Compared with the prior art, the invention has the advantages that: through excision composite sheet equipment basic unit 1, take area trompil to take over 2 at the welding on equipment multiple layer 3, then take the mode of area trompil, avoided directly that the process medium that causes trompil on equipment easily gets into the composite sheet gap, cause the corruption scheduling problem, have easy operation, characteristics that the reliability is high, reduced trompil and welding simultaneously and to each layer of adverse effect of material performance, guaranteed the technological action of stainless steel multiple layer and the bearing capacity of carbon steel basic unit, realized the safe and reliable operation behind the online area trompil of stainless steel composite sheet pressure-bearing equipment. The method can be applied to the online maintenance of the composite board pressure-bearing equipment.
While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (10)
1. An online under-pressure tapping method for composite plate pressure-bearing equipment is disclosed, wherein an equipment compound layer is covered on the composite plate pressure-bearing equipment, and an equipment base layer is covered on the equipment compound layer; the online under-pressure tapping method comprises the following steps:
the method comprises the following steps: online trompil of basic unit
Cutting off a part of the equipment base layer under the condition of not damaging the equipment composite layer;
step two: multilayer welding
Vertically welding the connecting pipe with the pressure hole on the exposed surface of the equipment multilayer, forming a multilayer welding part between the connecting pipe with the pressure hole and the equipment multilayer by welding, and performing dye penetrant inspection;
step three: welding of transition layer
Welding a layer of transition welding part on the multilayer welding part;
step four: base layer welding
Welding a base layer welding part between the equipment base layer and the connecting pipe with the pressure hole and on the transition welding part, and performing dye penetrant inspection;
step five: on-line pressure tapping
And (4) punching holes on the equipment multilayer with pressure through the welded connecting pipe with the holes punched with pressure.
2. The online pressure tapping method for the composite plate pressure bearing equipment according to claim 1, wherein the material of the multilayer welding part and the material of the equipment multilayer are both stainless steel.
3. The online pressure tapping method for the composite plate pressure bearing equipment according to claim 1, wherein the material of the base layer welding part and the material of the equipment base layer are both carbon steel.
4. The online pressure tapping method for the composite plate pressure bearing equipment according to claim 1, wherein the material of the pressure tapping connecting pipe and the equipment composite layer are both stainless steel.
5. An online pressure tapping method for a composite plate pressure bearing device according to claim 1, wherein in the first step, a circular hole is cut on the device substrate by an oxygen-propane gas cutting process, and the diameter of the circular hole is larger than the outer diameter of the pressure tapping pipe.
6. The online pressure tapping method for the composite plate pressure bearing equipment according to claim 5, wherein the hole wall of the circular hole is subjected to gradient treatment to form a conical hole.
7. The online pressure tapping method for composite plate bearing equipment according to claim 6, wherein the included angle between the hole wall of the tapered hole and the equipment clad is α and is equal to 45 degrees.
8. The online pressure tapping method for the composite plate pressure-bearing equipment according to claim 1, wherein an included angle is formed between the end part of the pipe wall of the connecting pipe with the pressure tapping and the axial direction of the connecting pipe, and the included angle is equal to 45 degrees.
9. The online pressure tapping method for the composite plate pressure bearing equipment according to claim 1, wherein the material of the multilayer welding part is A022 welding rod, the material of the transition welding part is A042 welding rod, and the material of the base welding part is A302 welding rod.
10. The online pressure tapping method for the composite plate pressure equipment according to claim 1, characterized in that in the second step, a multilayer multichannel non-swing rapid welding method is adopted to weld the pipe joint of the connecting pipe with the pressure tapping on the multiple layers of the equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611168929.0A CN108202203B (en) | 2016-12-16 | 2016-12-16 | Online under-pressure tapping method for composite plate pressure-bearing equipment |
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| CN201611168929.0A CN108202203B (en) | 2016-12-16 | 2016-12-16 | Online under-pressure tapping method for composite plate pressure-bearing equipment |
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| CN108202203A CN108202203A (en) | 2018-06-26 |
| CN108202203B true CN108202203B (en) | 2020-04-14 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| NZ241150A (en) * | 1991-01-04 | 1994-07-26 | Sydney Edward Tilby | Structural panel made from sugar cane rinds; rind fibre-bundle strands randomly oriented in parallel planes and interconnected by binder coating |
| CN2104370U (en) * | 1991-10-21 | 1992-05-13 | 东北输油管理局 | Tapping and plugging machine for hydraulic pipe |
| US5593085A (en) * | 1995-03-22 | 1997-01-14 | Solar Turbines Incorporated | Method of manufacturing an impeller assembly |
| CN2670726Y (en) * | 2003-12-26 | 2005-01-12 | 华创天元实业发展有限责任公司 | Pipeline on-line sealer under pressure |
| CN201006861Y (en) * | 2006-11-20 | 2008-01-16 | 河南省中原大化集团有限责任公司 | Composite board equipment pressured stopping leak anti-corrosive tools |
| CN202283606U (en) * | 2011-09-29 | 2012-06-27 | 中国石油化工股份有限公司 | Locating device for opening hole for pipeline and hole opening system |
| CN105818201A (en) * | 2015-01-08 | 2016-08-03 | 中国石油天然气股份有限公司 | Punching auxiliary device for steel skeleton polyethylene plastic composite pipe |
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