CN115505407A - Method for enhancing sealing effect of coke oven ascending pipe socket - Google Patents

Method for enhancing sealing effect of coke oven ascending pipe socket Download PDF

Info

Publication number
CN115505407A
CN115505407A CN202211350813.4A CN202211350813A CN115505407A CN 115505407 A CN115505407 A CN 115505407A CN 202211350813 A CN202211350813 A CN 202211350813A CN 115505407 A CN115505407 A CN 115505407A
Authority
CN
China
Prior art keywords
layer
asbestos packing
sealing
socket
pipe
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202211350813.4A
Other languages
Chinese (zh)
Other versions
CN115505407B (en
Inventor
邵旭野
李岩
郭忠建
崔海蛟
教中华
刘祥东
李书博
罗瑞
邵翔宇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Benxi Beiying Iron and Steel Group Co Ltd
Original Assignee
Benxi Beiying Iron and Steel Group Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Benxi Beiying Iron and Steel Group Co Ltd filed Critical Benxi Beiying Iron and Steel Group Co Ltd
Priority to CN202211350813.4A priority Critical patent/CN115505407B/en
Publication of CN115505407A publication Critical patent/CN115505407A/en
Application granted granted Critical
Publication of CN115505407B publication Critical patent/CN115505407B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10BDESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B27/00Arrangements for withdrawal of the distillation gases
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10BDESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B27/00Arrangements for withdrawal of the distillation gases
    • C10B27/06Conduit details, e.g. valves
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10BDESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B29/00Other details of coke ovens
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16JPISTONS; CYLINDERS; SEALINGS
    • F16J15/00Sealings
    • F16J15/02Sealings between relatively-stationary surfaces
    • F16J15/06Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • F16J15/10Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
    • F16J15/12Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing with metal reinforcement or covering
    • F16J15/121Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing with metal reinforcement or covering with metal reinforcement
    • F16J15/126Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing with metal reinforcement or covering with metal reinforcement consisting of additions, e.g. metallic fibres, metallic powders, randomly dispersed in the packing

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Coke Industry (AREA)
  • Sealing Material Composition (AREA)

Abstract

The invention discloses a method for enhancing the sealing effect of a socket of a coke oven ascending pipe, which comprises the following steps: step one, setting; step two, standby; step three, paving; step four, installation; in the first step, ammonia water spraying is arranged inside the bridge pipe, a valve is arranged on a transportation ammonia water pipeline connected with the ammonia water spraying, and then the bridge pipe is fixedly connected to the riser pipe; preparing the socket in advance in the second step, and preparing a certain amount of asbestos packing, river sand, petroleum asphalt and sealing mixture for later use; in the third step, sequentially laying a first layer, a second layer, a third layer, a fourth layer and a fifth sealing material on the asbestos packing for standby in the second step; the invention discloses a five-layer type filling part new mode aiming at sealing of a socket part of a rising pipe, wherein the socket part of the rising pipe is influenced by spraying of an ammonia water nozzle and is influenced by corrosion of tar in raw gas to generate cracking influence, and the sealing effect is effectively improved.

Description

Method for enhancing sealing effect of coke oven ascending pipe socket
Technical Field
The invention relates to the technical field of sealing, in particular to a method for enhancing the sealing effect of a socket of a coke oven ascending pipe.
Background
Because the coke oven is longer in service life, the contact part of the socket and the spigot of the ascending pipe can gradually break or be directly flushed out under high-pressure flushing, tar separated out by cooling of raw gas is also carried out along with ammonia water, and the phenomena of serious tar swelling and ammonia water overflow at the position of the socket and spigot in the coal charging process are caused; therefore, the packing layout of the socket of the ascending pipe needs to be modified, but the packing layout before modification is a three-layer packing mode: the first layer is: asbestos packing with the diameter of 30mm is uniformly wound on the inner layer of the socket, and the asbestos packing with the diameter of 30mm is still wound on the second layer; the last layer is made of fine iron powder which is transversely paved on the surface of the spigot, and the sealing effect is limited, so that a method for enhancing the sealing effect of the spigot of the ascending pipe of the coke oven is necessary.
Disclosure of Invention
The invention aims to provide a method for enhancing the sealing effect of a socket of a coke oven ascending pipe so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a method for enhancing the sealing effect of a bell socket of a coke oven ascending pipe comprises the following steps: step one, setting; step two, standby; step three, paving; step four, mounting;
in the first step, arranging ammonia water spray in the bridge pipe, arranging a valve on a transportation ammonia water pipeline connected with the ammonia water spray, and then fixedly connecting the bridge pipe to the riser;
in the second step, preparing the joint in advance, and preparing a certain amount of asbestos packing, river sand, petroleum asphalt and sealing mixture for later use;
in the third step, sequentially laying a first layer, a second layer, a third layer, a fourth layer and a fifth sealing material on the asbestos packing for standby in the second step;
in the fourth step, the receiving port paved with the sealing material in the third step is installed on the bridge pipe.
Preferably, in the first step, a riser water seal tank is arranged on the riser.
Preferably, in the second step, the diameter of the prepared asbestos packing is 30mm, and the asbestos packing is resistant to high temperature of 1000-2000 ℃.
Preferably, in the second step, the sealing mixture is prepared by mixing 20% of fine iron powder, 40% of cast iron filings and 40% of petroleum asphalt.
Preferably, in the third step, the first layer of sealing material is asbestos packing, the second layer of sealing material is river sand, the third layer of sealing material is petroleum asphalt, the fourth layer of sealing material is asbestos packing, and the fifth layer of sealing material is sealing mixture.
Preferably, in the third step, the step of laying is that, in the first layer of the socket, the spare asbestos packing is uniformly laid and compacted, then the spare river sand is laid on the asbestos packing of the first layer, the laying thickness of the river sand is 10-15mm, the spare petroleum asphalt is uniformly laid on the river sand as the binder of the third layer, then the asbestos packing is continuously used as the fourth layer and laid on the petroleum asphalt, the asbestos packing is uniformly compacted, and finally the spare sealing mixture is uniformly laid on the asbestos packing of the fourth layer.
Compared with the prior art, the invention has the beneficial effects that: the method for enhancing the sealing effect of the coke oven ascending pipe socket aims at the sealing effect of the ascending pipe socket caused by the influence of spraying of an ammonia water nozzle and the cracking influence caused by the corrosion of tar in crude gas, and the five-layer packing is invented in a new manner, so that the sealing effect is effectively improved, and the existing requirement on the sealing effect is met; the phenomenon that the energy medium overflows at the socket is effectively solved, the environmental hidden danger and the environmental relative penalty are eliminated, and meanwhile, the relative energy medium is greatly saved.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a schematic view of the installation of the present invention at a seal location;
in the figure: 1. a socket; 2. spraying ammonia water; 3. a riser water seal tank; 4. a bridge pipe; 5. a riser.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Referring to fig. 1-2, an embodiment of the present invention is shown: a method for enhancing the sealing effect of a coke oven ascending pipe socket comprises the following steps: step one, setting; step two, standby; step three, paving; step four, mounting;
in the first step, arranging an ammonia water spray 2 in the bridge pipe 4, arranging a valve on a transportation ammonia water pipeline connected with the ammonia water spray 2, and then fixedly connecting the bridge pipe 4 to a riser pipe 5, wherein a riser water seal tank 3 is arranged on the riser pipe 5;
in the second step, preparing the socket 1 in advance, preparing a certain amount of asbestos packing, river sand, petroleum asphalt and a sealing mixture for later use, wherein the diameter of the prepared asbestos packing is 30mm, the high temperature resistance is 1000-2000 ℃, and the sealing mixture is formed by mixing 20% of fine iron powder, 40% of cast iron chips and 40% of petroleum asphalt;
in the third step, the first layer, the second layer, the third layer, the fourth layer and the fifth sealing material are sequentially paved on the asbestos packing for standby in the second step; the first layer of sealing material is asbestos packing, the second layer of sealing material is river sand, the third layer of sealing material is petroleum asphalt, the fourth layer of sealing material is asbestos packing and the fifth layer of sealing material is sealing mixture, and the laying process is as follows, in the first layer of the receiving opening 1, the spare asbestos packing is uniformly laid and compacted, then the spare river sand is laid on the first layer of asbestos packing, the laying thickness of the river sand is 10-15mm, the spare petroleum asphalt is uniformly laid on the river sand as the binder of the third layer, then the asbestos packing is continuously used as the fourth layer and laid on the petroleum asphalt, the asbestos packing is uniformly compacted, and finally the spare sealing mixture is uniformly laid on the fourth layer of asbestos packing;
in the fourth step, the receiving port 1 paved with the sealing material in the third step is installed on the bridge pipe 4.
Based on the above, the invention has the advantages that when the invention is used, asbestos packing (phi 30mm, high temperature resistant 1000-2000 ℃) is paved on the first layer of the socket, after uniform compaction, river sand with the specific thickness of (10-15 mm) is paved on the first layer as the second layer; paving petroleum asphalt on the third layer as a binder, and continuously using asbestos packing on the fourth layer and compacting; and the fifth layer uses a mixture of 20% of fine iron powder, 40% of cast iron chips and 40% of petroleum asphalt, the thickness of the paved layer is 15-20mm, the phenomenon that the energy medium at the socket overflows is effectively solved, the environmental hidden danger and the environmental relative penalty are eliminated, and the relative energy medium is greatly saved.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims (6)

1. A method for enhancing the sealing effect of a coke oven ascending pipe socket comprises the following steps: step one, setting; step two, standby; step three, paving; step four, installation; the method is characterized in that:
in the first step, arranging an ammonia water spray (2) in the bridge pipe (4), arranging a valve on a transportation ammonia water pipeline connected with the ammonia water spray (2), and then fixedly connecting the bridge pipe (4) to an ascending pipe vertical pipe (5);
in the second step, the socket (1) is prepared in advance, and a certain amount of asbestos packing, river sand, petroleum asphalt and sealing mixture are prepared for later use;
in the third step, sequentially laying a first layer, a second layer, a third layer, a fourth layer and a fifth sealing material on the asbestos packing for standby in the second step;
wherein in the fourth step, the receiving port (1) paved with the sealing material in the third step is arranged on the bridge pipe (4).
2. The method for enhancing the socket sealing effect of the coke oven rising pipe according to claim 1, wherein the method comprises the following steps: in the first step, a riser water seal groove (3) is arranged on the riser (5).
3. The method for enhancing the socket sealing effect of the ascending pipe of the coke oven as claimed in claim 1, wherein the method comprises the following steps: in the second step, the diameter of the prepared asbestos packing is 30mm, and the temperature resistance is 1000-2000 ℃.
4. The method for enhancing the socket sealing effect of the coke oven rising pipe according to claim 1, wherein the method comprises the following steps: in the second step, the sealing mixture is prepared by mixing 20% of fine iron powder, 40% of cast iron scraps and 40% of petroleum asphalt.
5. The method for enhancing the socket sealing effect of the ascending pipe of the coke oven as claimed in claim 1, wherein the method comprises the following steps: in the third step, the sealing material of the first layer is asbestos packing, the sealing material of the second layer is river sand, the sealing material of the third layer is petroleum asphalt, the sealing material of the fourth layer is asbestos packing, and the sealing material of the fifth layer is a sealing mixture.
6. The method for enhancing the socket sealing effect of the ascending pipe of the coke oven as claimed in claim 1, wherein the method comprises the following steps: and in the third step, the laying process comprises the following steps of uniformly laying and compacting the spare asbestos packing on the first layer of the receiving port (1), then laying the spare river sand on the asbestos packing of the first layer, wherein the laying thickness of the river sand is 10-15mm, uniformly laying the spare petroleum asphalt serving as a third layer of binder on the river sand, then continuously laying the asbestos packing serving as a fourth layer on the petroleum asphalt, uniformly compacting the asbestos packing, and finally uniformly laying the spare sealing mixture on the asbestos packing of the fourth layer.
CN202211350813.4A 2022-10-31 2022-10-31 Method for enhancing sealing effect of bell and spigot of ascending pipe of coke oven Active CN115505407B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211350813.4A CN115505407B (en) 2022-10-31 2022-10-31 Method for enhancing sealing effect of bell and spigot of ascending pipe of coke oven

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211350813.4A CN115505407B (en) 2022-10-31 2022-10-31 Method for enhancing sealing effect of bell and spigot of ascending pipe of coke oven

Publications (2)

Publication Number Publication Date
CN115505407A true CN115505407A (en) 2022-12-23
CN115505407B CN115505407B (en) 2024-09-06

Family

ID=84512088

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211350813.4A Active CN115505407B (en) 2022-10-31 2022-10-31 Method for enhancing sealing effect of bell and spigot of ascending pipe of coke oven

Country Status (1)

Country Link
CN (1) CN115505407B (en)

Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR730031A (en) * 1930-01-11 1932-08-05 Process for the extraction and improvement of the still gases produced in the manufacture of semi-coke and whole coke by means of fuels of all kinds, in particular hard coal, lignite, peat, wood and the like
DE2531885A1 (en) * 1975-07-17 1977-01-20 Gutehoffnungshuette Sterkrade Railway bridge section sealing plate - has tie rod anchors and expansion gap, and gravel and mortar fillers
FR2346430A1 (en) * 1977-03-11 1977-10-28 Coal Industry Patents Ltd USEFUL CALFATTING MATERIAL FOR REPAIRING COKE OVEN DOORS
DE2845045A1 (en) * 1978-10-16 1980-04-17 Still Carl Gmbh Co Kg Coke oven chamber door seal - by sealing compound sprayed from moving nozzles on surfaces surrounding door frames
CN2107466U (en) * 1991-12-19 1992-06-17 石家庄焦化厂 Horses hoof flange seal device for coking furnace upstream tube system
RU2188179C2 (en) * 2000-09-26 2002-08-27 Открытое акционерное общество "Западно-Сибирский металлургический комбинат" Refractory body for plugging of blast-furnace tapholes
CN102268269A (en) * 2011-07-06 2011-12-07 中冶焦耐(大连)工程技术有限公司 Method for drawing raw coal gas out of coke oven
CN102518199A (en) * 2011-12-15 2012-06-27 昆明理工大学 Hermetic connecting method for bell mouth of plastic inspection well
CN102791831A (en) * 2010-03-31 2012-11-21 新日本制铁株式会社 Coal distilled gas hot treatment facility and coke oven gas hot treatment facility
JP2015157906A (en) * 2014-02-24 2015-09-03 三菱化学株式会社 Device and method for recovering tar of coke oven
CN105179821A (en) * 2015-09-22 2015-12-23 山东龙泉管道工程股份有限公司 Full-anti-corrosion embedded type prestress steel cylinder concrete pipe used for direct drinking water
CN106499894A (en) * 2016-11-15 2017-03-15 深圳市深水水务咨询有限公司 A kind of pipeline spigot-and-socket connects sealing technology
CN206927843U (en) * 2017-06-27 2018-01-26 攀钢集团攀枝花钢钒有限公司 Attachment structure for bridge tube bell and spigot
CN108003901A (en) * 2017-12-05 2018-05-08 马鞍山钢铁股份有限公司 A kind of coke oven bridge tube replacing options and its replacement auxiliary device
CN111778378A (en) * 2020-07-13 2020-10-16 唐山飞迪冶金材料有限公司 Converter slag splashing furnace protecting material and using method thereof
CN114410316A (en) * 2021-12-24 2022-04-29 包头钢铁(集团)有限责任公司 Method for preventing corrosion of coke oven bridge pipe in coke oven production

Patent Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR730031A (en) * 1930-01-11 1932-08-05 Process for the extraction and improvement of the still gases produced in the manufacture of semi-coke and whole coke by means of fuels of all kinds, in particular hard coal, lignite, peat, wood and the like
DE2531885A1 (en) * 1975-07-17 1977-01-20 Gutehoffnungshuette Sterkrade Railway bridge section sealing plate - has tie rod anchors and expansion gap, and gravel and mortar fillers
FR2346430A1 (en) * 1977-03-11 1977-10-28 Coal Industry Patents Ltd USEFUL CALFATTING MATERIAL FOR REPAIRING COKE OVEN DOORS
DE2845045A1 (en) * 1978-10-16 1980-04-17 Still Carl Gmbh Co Kg Coke oven chamber door seal - by sealing compound sprayed from moving nozzles on surfaces surrounding door frames
CN2107466U (en) * 1991-12-19 1992-06-17 石家庄焦化厂 Horses hoof flange seal device for coking furnace upstream tube system
RU2188179C2 (en) * 2000-09-26 2002-08-27 Открытое акционерное общество "Западно-Сибирский металлургический комбинат" Refractory body for plugging of blast-furnace tapholes
CN102791831A (en) * 2010-03-31 2012-11-21 新日本制铁株式会社 Coal distilled gas hot treatment facility and coke oven gas hot treatment facility
CN102268269A (en) * 2011-07-06 2011-12-07 中冶焦耐(大连)工程技术有限公司 Method for drawing raw coal gas out of coke oven
CN102518199A (en) * 2011-12-15 2012-06-27 昆明理工大学 Hermetic connecting method for bell mouth of plastic inspection well
JP2015157906A (en) * 2014-02-24 2015-09-03 三菱化学株式会社 Device and method for recovering tar of coke oven
CN105179821A (en) * 2015-09-22 2015-12-23 山东龙泉管道工程股份有限公司 Full-anti-corrosion embedded type prestress steel cylinder concrete pipe used for direct drinking water
CN106499894A (en) * 2016-11-15 2017-03-15 深圳市深水水务咨询有限公司 A kind of pipeline spigot-and-socket connects sealing technology
CN206927843U (en) * 2017-06-27 2018-01-26 攀钢集团攀枝花钢钒有限公司 Attachment structure for bridge tube bell and spigot
CN108003901A (en) * 2017-12-05 2018-05-08 马鞍山钢铁股份有限公司 A kind of coke oven bridge tube replacing options and its replacement auxiliary device
CN111778378A (en) * 2020-07-13 2020-10-16 唐山飞迪冶金材料有限公司 Converter slag splashing furnace protecting material and using method thereof
CN114410316A (en) * 2021-12-24 2022-04-29 包头钢铁(集团)有限责任公司 Method for preventing corrosion of coke oven bridge pipe in coke oven production

Non-Patent Citations (7)

* Cited by examiner, † Cited by third party
Title
于清溪: "橡胶建筑材料发展现状与展望(下)", 橡塑技术与装备, no. 04, 20 April 2005 (2005-04-20) *
姚志麒: "配水系统――饮用水中诱变剂的潜在来源", 国外医学.卫生学分册, no. 01, 25 January 1987 (1987-01-25) *
李应超;闫俊英;李秋军;: "应用河砂填塞托盘座承插口的探讨", 科技信息(科学教研), no. 04, 1 February 2008 (2008-02-01) *
李应超;闫俊英;李秋军;: "应用河砂填塞托盘座承插口的探讨", 科技信息(科学教研), no. 04, 31 December 2008 (2008-12-31) *
王文光, 张景刚: "大容积焦炉砌筑的实践经验", 煤气与热力, vol. 25, no. 10, 31 October 2005 (2005-10-31) *
王明杰: "油麻石棉水泥等管道接口密封填料的探析", 中国市政工程, no. 01, 25 February 2003 (2003-02-25) *
郝风英;: "新型防水材料的推广应用", 石河子科技, no. 03, 10 June 2007 (2007-06-10) *

Also Published As

Publication number Publication date
CN115505407B (en) 2024-09-06

Similar Documents

Publication Publication Date Title
CN104482298B (en) HDPE (high-density polyethylene) steel-plastic composite spiral winding drainage pipe installation construction method
CN101457854A (en) Large-diameter hot water pipe non-compensation direct-burried laying method
Sha et al. Pavement structure and materials design for sea-crossing bridges and tunnel: Case study of the Hong Kong–Zhuhai–Macau Bridge
CN206268618U (en) Pipeline support frame used in comprehensive pipe gallery and external member thereof
CN202131613U (en) Lined prefabricated reinforced concrete inspection well
CN109578738B (en) Piping-preventing directional drilling pipeline isolation pipe plugging device
CN115505407B (en) Method for enhancing sealing effect of bell and spigot of ascending pipe of coke oven
CN208099288U (en) Oil pipeline ductile iron pipe
CN213541549U (en) Waterproof plugging structure of floor pipeline sleeve pipe
CN104929254A (en) Antiseptic and processing method for margin plate at bottom outside gas chamber
CN105002494A (en) Silicon-aluminum alloy composite pipeline
CN202361000U (en) Sealed waterproof submarine thermal-insulation pipe
CN103697287B (en) A kind of making method of deep water wet type thermal insulation anode pipe
CN205592498U (en) Corrosion -resistant type petroleum pipeline rack keeps warm
CN2851777Y (en) Multi-pipe combined apparatus for crossing river
CN107100100A (en) The corrugated steel pipe shaping culvert construction method of housing type joint connection
CN208919492U (en) A kind of double-layer bumper tubing
CN206386690U (en) NG imports steel pipe and cylinder sealing structure
CN204437508U (en) A kind of prefabricated direct-buried thermal insulation pipe with waterproof construction
CN206681795U (en) A kind of underground coal mine fire dam with self-repair function
Guo Analysis of HDPE pipe construction process in municipal water supply and drainage construction
CN220747152U (en) New and old drainage pipe connection structure
CN205534685U (en) PCCP (prestressed concrete cylinder pipe) interface block structure
CN218543450U (en) Asphalt foaming pipe
CN113278295B (en) Resin rubber modified asphalt, PCCP pipeline flexible joint coating method and application thereof

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant