CN104308475A - Novel composite steel pipe manufacturing method for coal mine underground gas drainage - Google Patents
Novel composite steel pipe manufacturing method for coal mine underground gas drainage Download PDFInfo
- Publication number
- CN104308475A CN104308475A CN201410505397.XA CN201410505397A CN104308475A CN 104308475 A CN104308475 A CN 104308475A CN 201410505397 A CN201410505397 A CN 201410505397A CN 104308475 A CN104308475 A CN 104308475A
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- Prior art keywords
- pipeline
- coal mine
- steel pipe
- epoxy resin
- new type
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/12—Making tubes or metal hoses with helically arranged seams
- B21C37/122—Making tubes or metal hoses with helically arranged seams with welded or soldered seams
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
The invention discloses a novel composite steel pipe manufacturing method for coal mine underground gas drainage and belongs to the technical field of coal mine pipeline transportation. A novel composite steel pipe is made of a cold rolled steel belt in a winding, occluding and welding mode, the surface of the novel composite steel pipe is roughened by acid solution or alkaline solution, and zinc enriched epoxy resin and an epoxy ceramic material are sequentially coated inside and outside the pipeline and are dried in the air or are baked. According to the manufacturing method, the weight of the pipe is reduced on the basis of guaranteeing the using performance of the pipe, and the corrosion resistance of the pipe and the abrasive resistance of the coating surface are improved, so that the cost of the pipe is reduced, and the service life is prolonged.
Description
Technical field
The invention belongs to pipeline of coal mine field, be specifically related to a kind of gas under coal mine NEW TYPE OF COMPOSITE manufacture of steel pipe.
Background technology
For guaranteeing the safety that underground coal mine is produced, the methane gas in coal seam and tunnel need be extracted out.China is coal production state maximum in the world, has many big and small collieries, and pipeline is used in a large amount of the drawing out methane of annual needs.
The pipeline of current use is roughly divided into following several: (1) common steel tube; (2) dual anti-plastic tube; (3) plastic-coated steel; (4) stainless steel tube.In above pipeline, stainless steel tube is due to expensive, and use amount is few.Common steel tube is due to corrosion-resistant, and under the condition of underground coal mine humidity, be very easily corroded, service life is short, and weight is large, installs extremely inconvenient.Although dual anti-plastic tube has the advantages such as lightweight, corrosion-resistant, the intensity of plastic tube is much smaller than steel pipe, and price is higher.Plastics are covered steel tube surface owing to adopting simple leaching means of moulding by leaching Plastic Steel Pipe, easily come off, and the weight of still reduction tubing not yet in effect, simple plastic coatings can not resist the electrochemical corrosion that down-hole pipe exists.
Summary of the invention
The object of this invention is to provide a kind of gas under coal mine NEW TYPE OF COMPOSITE manufacture of steel pipe, make tubing on the basis of guaranteeing serviceability, reduce the weight of tubing, strengthen the corrosion resistance of tubing and the wearability of clad surface, thus reduce the cost of tubing, improve its service life.
A kind of gas under coal mine NEW TYPE OF COMPOSITE manufacture of steel pipe, comprises the following steps:
(1) cold-rolled strip is selected, by clean for the removing surface of cold-rolled strip;
(2) ribbon spiral occlusion is wound around and welds and forms pipeline; In spiral winding occlusion welding process, steel band edge carries out flange process, and adjacent two sections of steel bands overlap at flange place, and steel band flange also, after overlap joint, welds at pipeline outer wall, and weld seam is on the cold-rolled strip surface of adjacent two sections of steel bands;
(3) weld seam is carried out polishing, and rinse well with clear water;
(4) configure cleaning solution, be immersed in cleaning solution by pipeline, and with the repeated multiple times washing pipeline of clear water, then dried by pipeline or dry, dip time is 120 minutes;
(5) with acid solution or alkaline solution to pipeline shower, then removing conduit, and with clear water cyclic washing repeatedly, pipeline is dried or dries;
(6) by inside and outside zinc-riched epoxy resin spray to pipeline, adopt heater to be dried by pipeline surfaces externally and internally resin, form zinc-riched epoxy resin cladding;
(7) epoxy ceramic coating is sprayed into the resin surface inside and outside pipeline, forms epoxy ceramic coating, and naturally dry.
Further, described pipeline configuration carries out single-sided welding at pipeline outer wall, occlusion portion
By extending the length that can discharge 3% ~ 6%, guarantee that again methane gas is not revealed simultaneously.
Further, described cleaning solution is neutral detergent solution.
Further, described acid solution is the hydrochloric acid solution of 1mol/L, and alkaline solution is potassium hydroxide solution or the sodium hydroxide solution of 1mol/L.
Further, described zinc-riched epoxy resin is made up of 12.5% epoxy resin E-44,68.5% zinc powder, 1.8% curing agent T-31,16.9% acetone and 0.3% talcum powder.
Further, described epoxy ceramic coating is made up of 33.3% epoxy resin E-44,50% ceramic powder, 5% diluent 660A, 8.3% curing agent T-31,1.7% ethylenediamine and 1.7% 2,4,6-tri-(dimethylamino methyl) phenol.
Further, described heater is electric heating coil.
Compared with prior art, the present invention has following beneficial effect:
(1) welding line structure had with Novel composite pipe road that draws out methane provided by the invention, plays booster action, improves the compression strength of described pipeline, reduce pipe production cost simultaneously.
(2) unique in forming process occlusion structure (as accompanying drawing 1) adds one side (pipe outer wall) Welding Structure, make this pipeline in coal mine gas course of conveying, because of geology change, the displacement produced or stretching, occlusion portion discharges the length of 3%-6% by extending, guarantee that again methane gas is not revealed simultaneously.
(3) pipeline adopts stainless steel material, improves pipeline life, has antistatic effect simultaneously.
(4) the present invention adopts acid solution or alkaline solution to rinse, and carries out coarse process, can strengthen pipeline adhesion strength inside and outside pipeline.
(5) internal coated layer adopts zinc-riched epoxy resin, and the adhesion of zinc-riched epoxy resin and steel is strong, and on the basis of antioxidant anticorrosive, greatly strengthen anti-potential corrosion ability.
(6) outside of internal coated layer is one deck epoxy ceramic coating, and this coating has very high intensity and wearability, when not only can resist conveying gas, and the abrasion of solid particulate matter, and also pipe outer surface also has stronger anti-wear damage capability.
(7) the duplex coating structure of the present invention's employing, internal coated layer is zinc-riched epoxy resin, outer covering layer adopts epoxy ceramic coating, and the resistance to corrosion substantially increasing pipeline is anti-, abrasive capacity and anti-wear damage capability, and tubing was greatly improved in the service life of down-hole.
(8) pipeline has the combination properties such as anticorrosion, fire-retardant and antistatic, improves pipeline safety in utilization.
Accompanying drawing explanation
Fig. 1 is pipeline welding structural representation provided by the invention.
Description of reference numerals:
1, pipeline; 2, weld seam; 3, zinc-riched epoxy resin cladding; 4, epoxy ceramic coating.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is described further:
Embodiment 1
A kind of gas under coal mine NEW TYPE OF COMPOSITE manufacture of steel pipe, comprises the following steps:
(1) thickness is selected to be the cold-rolled strip of 2.5mm, by clean for the removing surface of cold-rolled strip;
(2) ribbon spiral occlusion is wound around and welds formation diameter is that the pipeline 1(of 500mm is as accompanying drawing 1); In spiral winding occlusion welding process, steel band edge carries out flange process, and adjacent two sections of steel bands overlap at flange place, and steel band flange also, after overlap joint, welds at pipeline outer wall, and weld seam 2 is on the cold-rolled strip surface of adjacent two sections of steel bands;
(3) weld seam 2 is carried out polishing, and rinse well with clear water;
(4) configure neutral detergent solution, pipeline 1 is immersed in cleaning solution, and with clear water 5 washing pipelines repeatedly, then dried by pipeline 1, dip time is 120 minutes;
(5) with the hydrochloric acid solution of 1mol/L to pipeline shower, then removing conduit 1, and with clear water cyclic washing 5 times, pipeline 1 being dried;
(6) by inside and outside zinc-riched epoxy resin spray to pipeline 1, adopt heating collar to be dried by pipeline 1 surfaces externally and internally resin, form zinc-riched epoxy resin cladding 3;
(7) epoxy ceramic coating is sprayed into the resin surface inside and outside pipeline 1, forms epoxy ceramic coating 4, and naturally dry.
Zinc-riched epoxy resin is made up of 12.5% epoxy resin E-44,68.5% zinc powder, 1.8% curing agent T-31,16.9% acetone and 0.3% talcum powder.
Epoxy ceramic coating is made up of 33.3% epoxy resin E-44,50% ceramic powder, 5% diluent 660A, 8.3% curing agent T-31,1.7% ethylenediamine and 1.7% 2,4,6-tri-(dimethylamino methyl) phenol.
The diameter of this tubing is 500mm, and thickness is 2.5mm, carries out ring stiffness test with regard to it, and the same bore of ring stiffness numeric ratio, the butt-welded tubing of stack pile improve 2.1 times.
Embodiment 2
A kind of gas under coal mine NEW TYPE OF COMPOSITE manufacture of steel pipe, comprises the following steps:
(1) thickness is selected to be the cold-rolled strip of 2.5mm, by clean for the removing surface of cold-rolled strip;
(2) ribbon spiral occlusion is wound around and welds formation diameter is that the pipeline 1(of 600mm is as accompanying drawing 1); In spiral winding occlusion welding process, steel band edge carries out flange process, and adjacent two sections of steel bands overlap at flange place, and steel band flange also, after overlap joint, welds at pipeline outer wall, and weld seam 2 is on the cold-rolled strip surface of adjacent two sections of steel bands;
(3) weld seam 2 is carried out polishing, and rinse well with clear water;
(4) configure neutral detergent solution, pipeline is immersed in cleaning solution, and with clear water 5 washing pipelines 1 repeatedly, then dried by pipeline 1, dip time is 120 minutes;
(5) with the sodium hydroxide solution of 1mol/L to pipeline shower, then removing conduit 1, and with clear water cyclic washing 5 times, pipeline 1 being dried;
(6) by inside and outside zinc-riched epoxy resin spray to pipeline 1, adopt heating collar to be dried by pipeline 1 surfaces externally and internally resin, form zinc-riched epoxy resin cladding 3;
(7) epoxy ceramic coating is sprayed into the resin surface inside and outside pipeline 1, forms epoxy ceramic coating 4, and naturally dry.
Zinc-riched epoxy resin is made up of 12.5% epoxy resin E-44,68.5% zinc powder, 1.8% curing agent T-31,16.9% acetone and 0.3% talcum powder.
Epoxy ceramic coating is made up of 33.3% epoxy resin E-44,50% ceramic powder, 5% diluent 660A, 8.3% curing agent T-31,1.7% ethylenediamine and 1.7% 2,4,6-tri-(dimethylamino methyl) phenol.
The diameter of tubing of the present invention is 600mm, and thickness is 2.5mm, intercept 600mm pipeline section with regard to its tubing, with same length, same to bore, carry out corrosion-resistant contrast test with the spiral welded pipe of the polyethylene plastic-coated of steel plate thickness.Sample is placed in simultaneously in the closed container of high humility, peracidity (or high alkalinity) atmosphere, within 100 days, detect the corrosion thickness of metal pipe-wall afterwards, find that tubing corrosion thickness of the present invention is only 24% of the corrosion thickness of common polythene plastic-coated spiral welded pipe, corrosion resistance increases substantially.
Embodiment 3
A kind of gas under coal mine NEW TYPE OF COMPOSITE manufacture of steel pipe, comprises the following steps:
(1) thickness is selected to be the cold-rolled strip of 2.0mm, by clean for the removing surface of cold-rolled strip;
(2) ribbon spiral occlusion is wound around and welds formation diameter is that the pipeline 1(of 550mm is as accompanying drawing 1); In spiral winding occlusion welding process, steel band edge carries out flange process, and adjacent two sections of steel bands overlap at flange place, and steel band flange also, after overlap joint, welds at pipeline 1 outer wall, and weld seam 2 is on the cold-rolled strip surface of adjacent two sections of steel bands;
(3) weld seam 2 is carried out polishing, and rinse well with clear water;
(4) configure neutral detergent solution, pipeline 1 is immersed in cleaning solution, and with clear water 5 washing pipelines 1 repeatedly, then dried by pipeline 1, dip time is 120 minutes;
(5) with the potassium hydroxide solution of 1mol/L to pipeline 1 shower, then removing conduit 1, and with clear water cyclic washing 5 times, pipeline 1 to be dried;
(6) by inside and outside zinc-riched epoxy resin spray to pipeline 1, adopt heating collar to be dried by pipeline 1 surfaces externally and internally resin, form zinc-riched epoxy resin cladding 3;
(7) epoxy ceramic coating is sprayed into the resin surface inside and outside pipeline 1, forms epoxy ceramic coating 4, and naturally dry.
Zinc-riched epoxy resin is made up of 12.5% epoxy resin E-44,68.5% zinc powder, 1.8% curing agent T-31,16.9% acetone and 0.3% talcum powder.
Epoxy ceramic coating is made up of 33.3% epoxy resin E-44,50% ceramic powder, 5% diluent 660A, 8.3% curing agent T-31,1.7% ethylenediamine and 1.7% 2,4,6-tri-(dimethylamino methyl) phenol.
The diameter of this tubing is 550mm, and thickness is 2.0mm, carries out ring stiffness test with regard to it, and the same bore of ring stiffness numeric ratio, the butt-welded tubing of stack pile improve 2.0 times.
The foregoing is only some embodiments of the present invention, do not limit the present invention, the technical scheme that the mode that all employings are equal to replacement or equivalent transformation obtains, all drop in protection scope of the present invention.
Claims (7)
1. a gas under coal mine NEW TYPE OF COMPOSITE manufacture of steel pipe, comprises the following steps:
(1) cold-rolled strip is selected, by clean for the removing surface of cold-rolled strip;
(2) ribbon spiral occlusion is wound around and welds and forms pipeline; In spiral winding occlusion welding process, steel band edge carries out flange process, and adjacent two sections of steel bands overlap at flange place, and steel band flange also, after overlap joint, welds at pipeline outer wall, and weld seam is on the cold-rolled strip surface of adjacent two sections of steel bands;
(3) weld seam is carried out polishing, and rinse well with clear water;
(4) configure cleaning solution, be immersed in cleaning solution by pipeline, and with the repeated multiple times washing pipeline of clear water, then dried by pipeline or dry, dip time is 120 minutes;
(5) with acid solution or alkaline solution to pipeline shower, then removing conduit, and with clear water cyclic washing repeatedly, pipeline is dried or dries;
(6) by inside and outside zinc-riched epoxy resin spray to pipeline, adopt heater to be dried by pipeline surfaces externally and internally resin, form zinc-riched epoxy resin cladding;
(7) epoxy ceramic coating is sprayed into the resin surface inside and outside pipeline, forms epoxy ceramic coating, and naturally dry.
2. gas under coal mine NEW TYPE OF COMPOSITE manufacture of steel pipe according to claim 1, it is characterized in that: described pipeline configuration carries out single-sided welding at pipeline outer wall, occlusion portion can discharge the length of 3% ~ 6% by extending, guarantee that again methane gas is not revealed simultaneously.
3. gas under coal mine NEW TYPE OF COMPOSITE manufacture of steel pipe according to claim 1, is characterized in that: described cleaning solution is neutral detergent solution.
4. gas under coal mine NEW TYPE OF COMPOSITE manufacture of steel pipe according to claim 1, is characterized in that: described acid solution is the hydrochloric acid solution of 1mol/L, alkaline solution is potassium hydroxide solution or the sodium hydroxide solution of 1mol/L.
5. gas under coal mine NEW TYPE OF COMPOSITE manufacture of steel pipe according to claim 1, is characterized in that: described zinc-riched epoxy resin is made up of 12.5% epoxy resin E-44,68.5% zinc powder, 1.8% curing agent T-31,16.9% acetone and 0.3% talcum powder.
6. gas under coal mine NEW TYPE OF COMPOSITE manufacture of steel pipe according to claim 1, it is characterized in that: described epoxy ceramic coating is by 33.3% epoxy resin E-44,50% ceramic powder, 5% diluent 660A, 8.3% curing agent T-31,1.7% ethylenediamine and 1.7% 2,4,6-tri-(dimethylamino methyl) phenol forms.
7. gas under coal mine NEW TYPE OF COMPOSITE manufacture of steel pipe according to claim 1, is characterized in that: described heater is electric heating coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410505397.XA CN104308475A (en) | 2014-09-28 | 2014-09-28 | Novel composite steel pipe manufacturing method for coal mine underground gas drainage |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410505397.XA CN104308475A (en) | 2014-09-28 | 2014-09-28 | Novel composite steel pipe manufacturing method for coal mine underground gas drainage |
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| CN104308475A true CN104308475A (en) | 2015-01-28 |
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| CN201410505397.XA Pending CN104308475A (en) | 2014-09-28 | 2014-09-28 | Novel composite steel pipe manufacturing method for coal mine underground gas drainage |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110201869A (en) * | 2019-06-06 | 2019-09-06 | 淄博鲲鹏防腐设备有限公司 | Coal mine gob draws out methane the dual anti-pipeline processing method of Po |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1417507A (en) * | 2001-11-08 | 2003-05-14 | 李志雄 | Production process of composite plastic-steel pipe with anti-corrosive coating |
| US20030190478A1 (en) * | 2002-04-04 | 2003-10-09 | Takaaki Kutsuna | Organic coated steel having excellent rust preventive and corrosion preventive performances and rust preventing method for metal |
| CN2893362Y (en) * | 2006-03-24 | 2007-04-25 | 中国石油天然气集团公司 | Seawater corrosion resisting modified epoxy ceramic anticorrosion layer seawater filling pipe |
| CN201351774Y (en) * | 2009-02-26 | 2009-11-25 | 杜邦华佳化工有限公司 | Corrosion resistant steel pipe |
| CN102108238A (en) * | 2011-01-14 | 2011-06-29 | 上海大学 | Method for preparing anticorrosive paint for surface of ocean oil well pipe and coating treatment method of anticorrosive paint on pipe surface |
| CN202578753U (en) * | 2012-04-05 | 2012-12-05 | 山西伯瑞纳特科技有限公司 | Gas draining pipe for coal mining |
| CN203176563U (en) * | 2013-02-02 | 2013-09-04 | 六枝特区华兴管业制品有限公司 | Enhancing type spiral continuous welding coating composite steel tube for underground coal mine |
| CN103343844A (en) * | 2013-07-02 | 2013-10-09 | 马明振 | Duplex-metal composite gas drainage pipeline with coating and manufacturing method thereof |
| CN203585598U (en) * | 2013-03-28 | 2014-05-07 | 河北拓安管业有限公司 | Mineral methane gas drainage pipe |
| CN104006228A (en) * | 2014-05-20 | 2014-08-27 | 安徽志拓管业有限公司 | Modified epoxide resin coating steel-plastic composite gas pipe and manufacturing method thereof |
-
2014
- 2014-09-28 CN CN201410505397.XA patent/CN104308475A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1417507A (en) * | 2001-11-08 | 2003-05-14 | 李志雄 | Production process of composite plastic-steel pipe with anti-corrosive coating |
| US20030190478A1 (en) * | 2002-04-04 | 2003-10-09 | Takaaki Kutsuna | Organic coated steel having excellent rust preventive and corrosion preventive performances and rust preventing method for metal |
| CN2893362Y (en) * | 2006-03-24 | 2007-04-25 | 中国石油天然气集团公司 | Seawater corrosion resisting modified epoxy ceramic anticorrosion layer seawater filling pipe |
| CN201351774Y (en) * | 2009-02-26 | 2009-11-25 | 杜邦华佳化工有限公司 | Corrosion resistant steel pipe |
| CN102108238A (en) * | 2011-01-14 | 2011-06-29 | 上海大学 | Method for preparing anticorrosive paint for surface of ocean oil well pipe and coating treatment method of anticorrosive paint on pipe surface |
| CN202578753U (en) * | 2012-04-05 | 2012-12-05 | 山西伯瑞纳特科技有限公司 | Gas draining pipe for coal mining |
| CN203176563U (en) * | 2013-02-02 | 2013-09-04 | 六枝特区华兴管业制品有限公司 | Enhancing type spiral continuous welding coating composite steel tube for underground coal mine |
| CN203585598U (en) * | 2013-03-28 | 2014-05-07 | 河北拓安管业有限公司 | Mineral methane gas drainage pipe |
| CN103343844A (en) * | 2013-07-02 | 2013-10-09 | 马明振 | Duplex-metal composite gas drainage pipeline with coating and manufacturing method thereof |
| CN104006228A (en) * | 2014-05-20 | 2014-08-27 | 安徽志拓管业有限公司 | Modified epoxide resin coating steel-plastic composite gas pipe and manufacturing method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110201869A (en) * | 2019-06-06 | 2019-09-06 | 淄博鲲鹏防腐设备有限公司 | Coal mine gob draws out methane the dual anti-pipeline processing method of Po |
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Application publication date: 20150128 |
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