CN114382977A - Prefabricating method of high-density polyethylene pipe row - Google Patents
Prefabricating method of high-density polyethylene pipe row Download PDFInfo
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- CN114382977A CN114382977A CN202011108901.4A CN202011108901A CN114382977A CN 114382977 A CN114382977 A CN 114382977A CN 202011108901 A CN202011108901 A CN 202011108901A CN 114382977 A CN114382977 A CN 114382977A
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- Prior art keywords
- pipe
- socket
- shaped
- branch pipe
- hole
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 229920001903 high density polyethylene Polymers 0.000 title claims abstract description 9
- 239000004700 high-density polyethylene Substances 0.000 title claims abstract description 9
- 238000003466 welding Methods 0.000 claims abstract description 44
- 238000010521 absorption reaction Methods 0.000 claims abstract description 16
- 239000012943 hotmelt Substances 0.000 claims abstract description 14
- 210000001503 joint Anatomy 0.000 claims abstract description 13
- 239000004698 Polyethylene Substances 0.000 claims abstract description 12
- -1 polyethylene Polymers 0.000 claims abstract description 12
- 229920000573 polyethylene Polymers 0.000 claims abstract description 12
- 238000009659 non-destructive testing Methods 0.000 claims abstract description 5
- 238000012545 processing Methods 0.000 claims abstract description 3
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 6
- 239000012768 molten material Substances 0.000 claims description 3
- 238000002844 melting Methods 0.000 abstract description 6
- 230000008018 melting Effects 0.000 abstract description 5
- 238000009825 accumulation Methods 0.000 abstract description 2
- 238000000605 extraction Methods 0.000 abstract 1
- 239000000289 melt material Substances 0.000 abstract 1
- 230000007797 corrosion Effects 0.000 description 9
- 238000005260 corrosion Methods 0.000 description 9
- 239000010935 stainless steel Substances 0.000 description 9
- 229910001220 stainless steel Inorganic materials 0.000 description 9
- 238000011001 backwashing Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
- 239000013535 sea water Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000009417 prefabrication Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000007822 coupling agent Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
- F16L47/26—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics for branching pipes; for joining pipes to walls; Adaptors therefor
- F16L47/32—Branch units, e.g. made in one piece, welded, riveted
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L41/00—Branching pipes; Joining pipes to walls
- F16L41/08—Joining pipes to walls or pipes, the joined pipe axis being perpendicular to the plane of the wall or to the axis of another pipe
- F16L41/082—Non-disconnectible joints, e.g. soldered, adhesive or caulked joints
- F16L41/084—Soldered joints
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
The invention provides a prefabricating method of a high-density polyethylene pipe row. The quality of the hot-melt butt joint of the main pipeline is strictly controlled through the ultrasonic nondestructive testing process of the hot-melt butt joint welding line of the main pipeline. Socket connection of the pipe seat branch pipe and the main pipeline is achieved by means of heat absorption time subsection accumulative control through developing and developing a customized hot melt socket welding machine. And through processing the T-shaped through hole bell mouth with a specific size type, the orderly accumulation of redundant melt materials in the socket welding process can be realized, and the blockage of the through hole of the tube seat is not influenced. The invention can ensure the quality reliability of butt welding seams of the tube rows and socket welding of the straight tubes of the tube seats, and greatly improves the efficiency and consistency of heat extraction melting and socket joints of the polyethylene tubes.
Description
Technical Field
The invention relates to prefabricated connection of high-density polyethylene pipelines, in particular to a prefabricating method of a high-density polyethylene pipe row.
Background
At present, the water spray pipeline and the nozzle of a drum-shaped filter screen backwashing system of a domestic nuclear power plant are made of stainless steel materials. The welding mode between the stainless steel pipe and the pipeline is manual argon arc welding, and the stainless steel pipe is manufactured through the processes of drilling a hole in the stainless steel pipe, welding a threaded pipe seat, connecting a nozzle and the like.
The running conditions of stainless steel seawater pipelines of a plurality of nuclear power plant backwashing systems in China are investigated, and the corrosion conditions of the backwashing stainless steel pipelines of in-service and under-construction nuclear power generating units are found to be ubiquitous, particularly in nuclear power plants with long running time. The results of the corrosion research of the relevant corrosion protection unit on the CFI stainless steel pipeline show that: the welding seams and the heat affected zones of the stainless steel water spray pipe rows are easy to generate chloride ion small hole corrosion, and the corrosion resistance of the passive film on the inner wall of the pipeline is reduced due to welding damage. As the flushing tube bank is subjected to oxidation corrosion of chlorine-containing seawater for a long time, the quality of seawater is deteriorated, and the accumulated action of various complex operation conditions of the system, the perforation corrosion and nozzle corrosion of the water spraying tube bank successively appear in a nuclear power plant in recent years, and the reliable operation of the drum-shaped filter screen backwashing system is seriously influenced.
High Density Polyethylene (HDPE) pipes are widely used in the fields of chemical engineering, municipal engineering and ocean engineering due to the advantages of corrosion resistance, radiation resistance, good earthquake resistance, long service life and the like, and are gradually becoming excellent objects for replacing carbon steel pipes and stainless steel pipes. The polyethylene pipes are generally connected by hot melting butt joint and electric melting, and mature equipment and process are adopted to control the welding quality. However, the whole prefabrication of the polyethylene pipe array needs a large amount of socket welding of pipe seat branch pipes besides hot melt butt joint. Polyethylene socket welding has a small number of applications in municipal engineering small-bore pipeline and accessory connection applications, but most of them belong to manual welding. The welding process is immature, the operation is not standard, the quality of a welding seam is difficult to guarantee, and potential safety hazards exist in a pipeline system. For a polyethylene tube bundle for nuclear power, data recording and welding quality control in a welding process are very important, and how to realize safety and reliability in a prefabrication process of the polyethylene tube bundle and consistency of socket welding of a large number of tube seat branch tubes is very important.
Disclosure of Invention
In order to solve the problems, the invention provides a prefabricating method of a high-density polyethylene pipe row, which specifically comprises the following steps:
the method comprises the following steps: prefabricating a polyethylene pipeline and a pipeline or a fitting into a main pipeline according to a drawing in a hot-melt butt joint mode, wherein all hot-melt butt joints need to be subjected to ultrasonic nondestructive testing, so that the quality of the butt joints is reliable;
step two: processing a T-shaped through hole on the pipe wall of the main pipe by using a T-shaped drill, wherein the diameter and the depth of a large circle of the T-shaped through hole can be set by the outer diameter of a branch pipe of a pipe seat; the diameter of the small circle is 10mm, the small circle is directly drilled through the main pipeline to be communicated with the inner diameter of the main pipeline, and the wall thickness of the bottom of the large circle, which is at least 3mm away from the inner wall of the main pipeline, is reserved, so that the excessive molten material generated in the socket process can be conveniently and orderly accumulated;
step three: setting the heat absorption time of the branch pipe according to the outer diameter and the wall thickness of the branch pipe of the pipe seat, and absorbing heat until a slight circle of melt appears at the bottom of the branch pipe;
step four: setting the heat absorption time of the socket according to the inner diameter size of the T-shaped through hole of the main polyethylene pipeline, wherein the heat absorption time of the socket is longer, the heat absorption time of the branch pipe can be included, and the sectional accumulative control is adopted;
step five: heating the T-shaped through hole of the main pipe by a male die heater of a hot melt socket welding machine at 225 ℃, heating to a certain time, and then heating the outer diameter of the branch pipe by a female die heater until the T-shaped through hole of the main pipe and the branch pipe synchronously finish heat absorption time;
step six: removing the male die heater and the female die heater, wherein the switching time needs to be controlled within 6s, the heated pipe seats are uniformly inserted into the T-shaped through holes of the main pipeline by a branch pipe holder of the welding machine, the pressure maintaining pressure can be controlled at 500N, and the pressure maintaining cooling time is kept for more than 90s under the pressure;
step seven: after the pressure maintaining and cooling time is over, the branch pipe holder of the welding machine loosens the branch pipe to complete the hot melt socket welding of the pipe seat branch pipe and the main pipeline;
the workbench of the welding machine moves to the next welding position of the main pipeline along the axial direction of the main pipeline, and orderly socket welding of fixed distance of the straight pipes of the pipe row pipe seats is sequentially realized;
the invention has the following advantages: 1. carrying out an ultrasonic nondestructive testing procedure on each welding line in hot-melting butt joint of the main pipeline, and ensuring the reliable quality of each welding line of the main pipeline; 2. socket welding can ensure the reliable quality of each socket welding weld joint by controlling the heat absorption time and the pressure maintaining pressure; 3. the specially processed T-shaped through hole of the main pipeline is beneficial to orderly accumulation of redundant melting materials in the socket process, and the through-flow capacity of the branch pipe is not influenced.
Drawings
FIG. 1 is a schematic diagram of the process of the present invention.
FIG. 2 is a partial schematic view of an embodiment of the present invention.
Detailed Description
Examples
1: a DN100 SDR7 polyethylene pipeline, a DN100 SDR7 tee joint and a pipe cap are prefabricated into a main pipeline according to a drawing in a hot melting butt joint mode. And 4h after welding, cleaning areas with widths of 6-8mm on two sides of a welding seam to be detected by 360 degrees, mounting a probe on a water immersion wedge block, introducing a coupling agent from a wedge block interface, enabling a non-focusing longitudinal wave beam generated by a transmitting probe to enter the welding seam to be detected at a certain angle, and determining the position and the size of the defect by a receiving probe through receiving a diffraction signal of the tip of the defect and time difference of the diffraction signal.
2: after ultrasonic nondestructive testing is carried out on all hot-melt butt welds, and no welding defect is confirmed, a T-shaped through hole is processed on the pipe wall of the main pipe by utilizing a T-shaped drill bit, wherein the diameter of the large circle of the T-shaped through hole is 24.0mm, and the depth of the T-shaped through hole is 14.2 mm; the small circle diameter is 10mm, and the main pipe is directly drilled through to be communicated with the inner diameter of the main pipe, but the inner wall of the main pipe cannot be damaged. The wall thickness of the big round bottom part which is 3.2mm away from the inner wall of the main pipeline is reserved, so that the excessive molten materials generated in the socket process can be orderly accumulated.
3: the heat absorption time of the tube socket branch tube with the outer diameter of 25.4mm and the wall thickness of 8.5mm is set to 9s, and the heat absorption time is slightly one circle of melt at the bottom of the branch tube.
4: and setting the heat absorption time of the socket of the T-shaped through hole of the polyethylene main pipe for 35 s.
5: and (3) firstly heating the T-shaped through hole of the main pipe by a male die heater of the hot melt socket welding machine at 225 ℃, heating to 26s, and then heating the outer diameter of the branch pipe by a female die heater until the T-shaped through hole of the main pipe and the branch pipe synchronously finish the heat absorption time at 35 s.
6: the male and female mold heaters were removed and the time switched for 5 s. The holder for the branch pipe of the welding machine inserts the heated pipe seat into the T-shaped through hole of the main pipe at uniform speed, the pressure maintaining pressure can be controlled at 500N, and the pressure maintaining cooling time is kept at 95s under the pressure.
6: the male and female mold heaters were removed and the time switched for 5 s. The holder for the branch pipe of the welding machine inserts the heated pipe seat into the T-shaped through hole of the main pipe at uniform speed, the pressure maintaining pressure can be controlled at 500N, and the pressure maintaining cooling time is kept at 95s under the pressure.
7: and after the pressure maintaining and cooling time is over, the branch pipe holder of the welding machine loosens the branch pipe to complete the hot melt socket welding of the pipe seat branch pipe and the main pipeline.
8: the welding machine workbench moves 78.0mm to the next welding position of the main pipeline along the axis direction of the main pipeline, and orderly socket welding of fixed distance of the straight pipes of the pipe header of the pipe row is sequentially realized.
9: the above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (1)
1. A prefabricating method of a high-density polyethylene pipe row is characterized by comprising the following steps: the method specifically comprises the following steps:
the method comprises the following steps: prefabricating a polyethylene pipeline and a pipeline or a fitting into a main pipeline according to a drawing in a hot-melt butt joint mode, wherein all hot-melt butt joints need to be subjected to ultrasonic nondestructive testing, so that the quality of the butt joints is reliable;
step two: processing a T-shaped through hole on the pipe wall of the main pipe by using a T-shaped drill, wherein the diameter and the depth of a large circle of the T-shaped through hole can be set by the outer diameter of a branch pipe of a pipe seat; the diameter of the small circle is 10mm, the small circle is directly drilled through the main pipeline to be communicated with the inner diameter of the main pipeline, and the wall thickness of the bottom of the large circle, which is at least 3mm away from the inner wall of the main pipeline, is reserved, so that the excessive molten material generated in the socket process can be conveniently and orderly accumulated;
step three: setting the heat absorption time of the branch pipe according to the outer diameter and the wall thickness of the branch pipe of the pipe seat, and absorbing heat until a slight circle of melt appears at the bottom of the branch pipe;
step four: setting the heat absorption time of the socket according to the inner diameter size of the T-shaped through hole of the main polyethylene pipeline, wherein the heat absorption time of the socket is longer, the heat absorption time of the branch pipe can be included, and the sectional accumulative control is adopted;
step five: heating the T-shaped through hole of the main pipe by a male die heater of a hot melt socket welding machine at 225 ℃, heating to a certain time, and then heating the outer diameter of the branch pipe by a female die heater until the T-shaped through hole of the main pipe and the branch pipe synchronously finish heat absorption time;
step six: and removing the male die heater and the female die heater, wherein the switching time needs to be controlled within 6s, the heated pipe seats are uniformly inserted into the T-shaped through holes of the main pipeline by the branch pipe clamp of the welding machine, the pressure maintaining pressure can be controlled at 500N, and the pressure maintaining cooling time is kept for more than 90s under the pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011108901.4A CN114382977A (en) | 2020-10-16 | 2020-10-16 | Prefabricating method of high-density polyethylene pipe row |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011108901.4A CN114382977A (en) | 2020-10-16 | 2020-10-16 | Prefabricating method of high-density polyethylene pipe row |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114382977A true CN114382977A (en) | 2022-04-22 |
Family
ID=81194407
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011108901.4A Pending CN114382977A (en) | 2020-10-16 | 2020-10-16 | Prefabricating method of high-density polyethylene pipe row |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114382977A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101537708A (en) * | 2009-04-03 | 2009-09-23 | 杜娟 | Plastic pipe grate processing technology and equipment |
| CN201496713U (en) * | 2009-08-28 | 2010-06-02 | 福建亚通新材料科技股份有限公司 | High-density polyethylene pipeline flange connecting part |
| CN104033684A (en) * | 2014-06-11 | 2014-09-10 | 永高股份有限公司 | Hot-melt welded PE (polyethylene) water distributing and collecting machine |
| CN204083588U (en) * | 2014-08-13 | 2015-01-07 | 王茂峰 | Full-bore injection molded polyethylene plastic hot melt socket pipe member |
| CN106290363A (en) * | 2016-07-29 | 2017-01-04 | 天津市世纪道康建筑科技有限公司 | A kind of quality inspection technique after steel-pipe welding |
| AU2016290894A1 (en) * | 2015-07-03 | 2018-02-22 | Vinidex Pty Limited | A pipe tee for pressure pipe |
| CN208859175U (en) * | 2018-08-20 | 2019-05-14 | 广东联塑科技实业有限公司 | A kind of water segregator |
| CN210424126U (en) * | 2019-08-28 | 2020-04-28 | 上海环钦科技发展有限公司 | Socket hot melting structure for HDPE drain pipe |
-
2020
- 2020-10-16 CN CN202011108901.4A patent/CN114382977A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101537708A (en) * | 2009-04-03 | 2009-09-23 | 杜娟 | Plastic pipe grate processing technology and equipment |
| CN201496713U (en) * | 2009-08-28 | 2010-06-02 | 福建亚通新材料科技股份有限公司 | High-density polyethylene pipeline flange connecting part |
| CN104033684A (en) * | 2014-06-11 | 2014-09-10 | 永高股份有限公司 | Hot-melt welded PE (polyethylene) water distributing and collecting machine |
| CN204083588U (en) * | 2014-08-13 | 2015-01-07 | 王茂峰 | Full-bore injection molded polyethylene plastic hot melt socket pipe member |
| AU2016290894A1 (en) * | 2015-07-03 | 2018-02-22 | Vinidex Pty Limited | A pipe tee for pressure pipe |
| CN106290363A (en) * | 2016-07-29 | 2017-01-04 | 天津市世纪道康建筑科技有限公司 | A kind of quality inspection technique after steel-pipe welding |
| CN208859175U (en) * | 2018-08-20 | 2019-05-14 | 广东联塑科技实业有限公司 | A kind of water segregator |
| CN210424126U (en) * | 2019-08-28 | 2020-04-28 | 上海环钦科技发展有限公司 | Socket hot melting structure for HDPE drain pipe |
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