CN102418828B - Corrosion prevention method for short metal pipe - Google Patents
Corrosion prevention method for short metal pipe Download PDFInfo
- Publication number
- CN102418828B CN102418828B CN201110344993.0A CN201110344993A CN102418828B CN 102418828 B CN102418828 B CN 102418828B CN 201110344993 A CN201110344993 A CN 201110344993A CN 102418828 B CN102418828 B CN 102418828B
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- stainless steel
- core tube
- steel cylinder
- corrosion prevention
- core pipe
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- Rigid Pipes And Flexible Pipes (AREA)
- Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
Abstract
The invention relates to a corrosion prevention method for a core tube, especially to a corrosion prevention method for an underground compensator sleeve core tube. The method is characterized by comprising the following steps of: manufacturing a stainless steel cylinder of which the internal diameter is matched with the external diameter of the core tube by using a stainless steel plate, sleeving the stainless steel cylinder on the outer wall of the core tube, performing pipe expansion on the core tube by using a mechanical pipe expansion method to form close fit between the stainless steel cylinder and the core tube, and securely welding a port of the stainless steel cylinder and the outer wall of the core tube. The method has the advantages that: the method is simple; the close fit is formed between the stainless steel plate and the core tube, and one port of the stainless steel cylinder is securely welded with the outer wall of the core tube, so that the stainless steel plate is more securely combined with the core tube, and the phenomenon that the stainless steel plate is expanded open by pressure water can be avoided even though a welded junction between the stainless steel cylinder and the core tube has an open welding point to realize long-term corrosion prevention.
Description
Technical field
The present invention relates to a kind of corrosion prevention method for short metal pipe, particularly a kind of anti-corrosion method of buried compensator sleeve core pipe, belongs to metal tube technical field of anticorrosion.
Background technique
In heating network, often use sleeve expansion joint, to solve the problem of expanding with heat and contract with cold of pipeline, eliminate pipe stress, require sleeve expansion joint sealability reliable simultaneously, durable and surface friction drag is little.
Sleeve expansion joint is primarily of outer sleeve, sealed letter, core pipe three part composition.Usually, outer sleeve and sealed letter are fixed and as a wholely to be compensated do relative movement with core pipe.The degree of finish of core tube-surface and antiseptic power directly have influence on the sealability of compensator.
The prior art making core pipe mainly contains two kinds: 1, by smooth for core tube-surface machined into, then electroplate, to reach bright and clean corrosion-resistant object.The shortcoming of the method is that degree of finish is difficult to ensure, electrodeposited coating long period of soaking has obscission in water, moreover electrodeposited coating is thinner, easily pulls.2, at the coated mirror finished stainless steel plate of core tube wall, at corrosion resistant plate seam crossing vertically with argon arc welding welding, itself and core pipe are fixed, then corrosion resistant plate both sides circumferential weld and core pipe is welded.The shortcoming of the method is: corrosion resistant plate and core pipe are fitted not tight, easily causes damage to both sides circumferential weld, affect the normal work of compensator during compensator motion.In addition, but corrosion resistant plate both sides circumferential weld often has some solder joints cracking in using, water is made to immerse between corrosion resistant plate and core tube wall, because water is with pressure, and the two ends of corrosion resistant plate are all welded with core pipe (short metal pipe), the pressure of water can be assembled in period, and corrosion resistant plate distending the most at last, loses antisepsis.
Summary of the invention
The object of this invention is to provide a kind of can the anti-corrosion method of corrosion-resistant buried compensator sleeve core pipe for a long time.
Method of the present invention is: make with corrosion resistant plate the stainless steel cylinder that an internal diameter and core pipe external diameter match, stainless steel cylinder is enclosed within core tube wall, by the method for mechanical expanding, expand tube is implemented to core pipe, make stainless steel cylinder and core pipe form drive fit, only a port and the core tube wall of stainless steel cylinder are welded.
Advantage of the present invention is: technique is simple, corrosion resistant plate and core tube wall are fitted closely, in addition stainless steel cylinder has a port and core tube wall to weld, corrosion resistant plate and core duct ligation is made to close more firm, snap a little even if the weld bond between stainless steel cylinder and core pipe has, also band setting-out can not be caused the phenomenon at corrosion resistant plate distending, can be anticorrosion for a long time.
Accompanying drawing explanation
Fig. 1 is core pipe anticorrosion process schematic diagram of the present invention.
In figure: 1, core pipe, 2, stainless steel cylinder, 3, weld seam.
Embodiment
With reference to accompanying drawing 1, method of the present invention is: make with corrosion resistant plate the stainless steel cylinder 2 that an internal diameter and core pipe 1 external diameter match, stainless steel cylinder 2 is enclosed within core pipe 1 outer wall, by the method for mechanical expanding, expand tube is implemented to core pipe 1, make stainless steel cylinder 2 and core pipe 1 form drive fit, stainless steel cylinder 2 port and core tube wall are welded.
With the buried compensator sleeve core pipe that method of the present invention makes, in the buried compensator for the heating network of Baotou heat supply company, through two heating seasons, there is corrosion phenomenon not yet.And buried compensator sleeve core pipe in the past, each heating season all needs to change.
Claims (1)
1. the anti-corrosion method of a buried compensator sleeve core pipe, it is characterized in that: make with corrosion resistant plate the stainless steel cylinder that an internal diameter and core pipe external diameter match, stainless steel cylinder is enclosed within core tube wall, by the method for mechanical expanding, expand tube is implemented to core pipe, make stainless steel cylinder and core pipe form drive fit, only a port and the core tube wall of stainless steel cylinder are welded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110344993.0A CN102418828B (en) | 2011-10-27 | 2011-10-27 | Corrosion prevention method for short metal pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110344993.0A CN102418828B (en) | 2011-10-27 | 2011-10-27 | Corrosion prevention method for short metal pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102418828A CN102418828A (en) | 2012-04-18 |
| CN102418828B true CN102418828B (en) | 2014-12-24 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110344993.0A Active CN102418828B (en) | 2011-10-27 | 2011-10-27 | Corrosion prevention method for short metal pipe |
Country Status (1)
| Country | Link |
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| CN (1) | CN102418828B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1210044A (en) * | 1998-08-14 | 1999-03-10 | 侯贤忠 | Carbon steel pipe with inner and outer corrosionproof stainless steel coatings and production thereof |
| CN1563772A (en) * | 2004-04-02 | 2005-01-12 | 程宇鸣 | Wholly wraped stainless steel pipes and its mfg method |
| CN101876383A (en) * | 2009-04-29 | 2010-11-03 | 北京安科管道工程科技有限公司 | Composite metal pipe and manufacturing method thereof as well as composite pipeline formed therefrom |
| CN101941133A (en) * | 2009-07-10 | 2011-01-12 | 中国石油天然气集团公司 | Method for manufacturing composite elbow with anticorrosion function |
| CN101941134A (en) * | 2009-07-10 | 2011-01-12 | 中国石油天然气集团公司 | Manufacturing method of stainless steel lining tee joint |
-
2011
- 2011-10-27 CN CN201110344993.0A patent/CN102418828B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1210044A (en) * | 1998-08-14 | 1999-03-10 | 侯贤忠 | Carbon steel pipe with inner and outer corrosionproof stainless steel coatings and production thereof |
| CN1563772A (en) * | 2004-04-02 | 2005-01-12 | 程宇鸣 | Wholly wraped stainless steel pipes and its mfg method |
| CN101876383A (en) * | 2009-04-29 | 2010-11-03 | 北京安科管道工程科技有限公司 | Composite metal pipe and manufacturing method thereof as well as composite pipeline formed therefrom |
| CN101941133A (en) * | 2009-07-10 | 2011-01-12 | 中国石油天然气集团公司 | Method for manufacturing composite elbow with anticorrosion function |
| CN101941134A (en) * | 2009-07-10 | 2011-01-12 | 中国石油天然气集团公司 | Manufacturing method of stainless steel lining tee joint |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102418828A (en) | 2012-04-18 |
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