RU2704392C2 - Method of coating application on pipe outer surface and device for implementation thereof - Google Patents

Method of coating application on pipe outer surface and device for implementation thereof Download PDF

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RU2704392C2
RU2704392C2 RU2017117589A RU2017117589A RU2704392C2 RU 2704392 C2 RU2704392 C2 RU 2704392C2 RU 2017117589 A RU2017117589 A RU 2017117589A RU 2017117589 A RU2017117589 A RU 2017117589A RU 2704392 C2 RU2704392 C2 RU 2704392C2
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Russia
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pipe
coating
pipes
shot blasting
along
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RU2017117589A
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Russian (ru)
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RU2017117589A3 (en
RU2017117589A (en
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Эдгар Ибрагимович Велиюлин
Сергей Валентинович Разгуляев
Батыр Довранкулыевич Аннаков
Александр Владимирович Погосян
Анатолий Павлович Толстиков
Игорь Дмитриевич Сивицкий
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Эдгар Ибрагимович Велиюлин
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Abstract

FIELD: machine building.
SUBSTANCE: group of inventions relates to pipeline transport and is used in repair of main gas pipelines with outer diameter of 530–1420 mm. Task of the declared group of inventions (IZ) is to expand the range of equipment. IZ allows creating complex of mobile process equipment, which can be moved by motor transport and quickly installed in conditions of quickly mounted shop. Under basic conditions, pipes are pre-cleaned, preheated, finely finished with pipes by shot blasting, insulates pipe outer surface by applying a protective polyurethane coating by airless spraying, wherein finishing of external surface of pipe and application of coating on it is carried out at rotation of each pipe relative to its longitudinal axis and longitudinal, relative to pipe, translational motion along rail track of bogies, on which device is arranged for shot blasting of external surface of pipe and installation for application of coating on it or its sprayer, respectively, and preliminary heating of each pipe is performed by supply of heat carrier into pipe, for which on its ends there installed and fixed are plugs with process holes for supply and removal of heat carrier. Heat carrier used is gaseous fuel combustion products, for example diesel fuel.
EFFECT: description is given of pipe preheating device, device for external pipe surface cleaning and device for application of coating on their outer surface.
7 cl, 2 dwg

Description

The group of inventions relates to pipeline transport and is used in the repair of gas pipelines with an outer diameter of 530-1420 mm. The group of inventions (hereinafter, IZ) relates to resource-saving technologies for the reuse of pipes, including for the subsequent installation of the linear part of the main gas pipelines from pipes dismantled during the overhaul of the linear part of the main gas pipelines.
The prior art group of inventions known "method of applying an insulating coating on the outer surface of the pipeline and devices for its implementation", which is used in route conditions when laying pipelines to protect them from corrosion (see RU No. 2443934, 02.27.2012). The outer surface of the pipeline is cleaned, a two-component polyurethane mixture is applied to it by airless spraying. Devices for cleaning and coating are made in the form of split frames with rotors, on which nozzles of a sandblasting apparatus and high pressure guns are fixed respectively. Frames rest on the outer surface of the pipeline with running wheels and move along the pipeline. The known solution is effective in construction when there is a multi-kilometer pipeline.
A known complex for insulation of welded pipe joints, which includes a device for cleaning the outer surface of the pipeline using a sandblasting machine (see RU 2267692, 01/10/2006). A disadvantage of the known solution is the limited scope, as well as low productivity due to the lack of complex mechanization and automation of the coating process.
Closest to the claimed group of inventions is the "method of repairing the pipeline", in which on the route, in basic conditions, the dismantled pipes are cleaned of old insulation with subsequent finishing processing of the outer surface of the pipes. The outer surface of the pipes is drained and prepared, for example, by shot blasting for coating. The outer surface of the pipes is insulated by applying a polyurethane protective coating. Each tube is based on two bogies, depending on the nature of the technological operations, each tube is rotationally driven during its longitudinal translational motion by moving the bogies along the rail (see RU No. 2462653, 09/27/2012).
A disadvantage of the known solution is the impossibility of rapid dismantling of the equipment complex, its rapid movement by truck and installation in a rapidly mounted workshop in the places of storage of pipes during the repair of gas pipelines.
The task of the claimed group of inventions is to expand the arsenal of technical means. The claimed group of inventions allows you to create a complex of mobile technological equipment that can be moved by road and quickly installed in a rapidly mounted workshop. The specified equipment is designed to perform the operations of the claimed method from preparation dismantled during the overhaul of the linear part of the main gas pipelines of large diameter pipes to the coating on their outer surface of the coating in the places of storage of pipes during the repair of main gas pipelines.
This problem is solved by the method of coating the outer surface of the pipes, in which, under basic conditions, the pipes are pre-cleaned, pre-heated, followed by the finishing treatment of the outer surface of the pipes by shot blasting, the outer surface of the pipes is isolated by applying a protective coating by airless spraying, while finishing the outer surface of the pipe and coating it is carried out automatically when each pipe is rotated relative to its length axis and longitudinal, relative to the pipe, translational movement along the rail of the carts on which, respectively, a shot blasting apparatus for the outer surface of the pipe and a unit for coating it or its atomizer are placed, and each pipe is heated by supplying a coolant inside the pipe, for which plugs with technological openings for supply and removal of coolant are installed and fixed at its ends.
As a heat carrier use gaseous products of fuel combustion, for example, diesel.
To implement the claimed method, a device is used to heat the pipe with gaseous products of fuel combustion, containing metal plugs installed and fixed at the ends of the pipe, each of which contains a shell covering the outer surface of the pipe and a hermetically connected bottom with technological holes, while the device is mounted on one plug for burning fuel with a burner tightly placed in the technological hole for supplying coolant, and on the other plug - a seal a sleeve, which is otherwise fixed in the hole for removal of the heat-transfer medium; moreover, pipe fixation elements are fixed at the indicated bottoms at the heating position.
To implement the claimed method, a shot blast cleaning device for the outer surface of the pipe is also used, which contains two fixed bearings with rollers and a pipe rotation drive relative to its longitudinal axis, an end stop for the pipe, a cart with wheels, a drive for moving it along a rail along the pipe being processed, mounted on trolley shot blasting machine with control cabin, vacuum system for suction and removal of dusty and abrasive waste, working head for cleaning the outer surface Pipes placed on the boom and is provided with a sealing attachment with the ability to be pressed against the outer surface of the treated tube, wherein said blade sealing elements are in the form of steel brushes resilient wires, which eliminates ingress tube cleaning products in the working zone. Management and control of the finishing of the outer surface of the pipe is carried out from the control cabin. To exclude axial movement during finishing of the pipe, the latter interacts with the end stop and is based on the rollers of these supports with an inclination towards the end stop at an angle of 0.3-1 degrees, which eliminates the axial movement of the pipe during its finishing. The position of the working head is adjustable, and it is installed in the center of the axis of rotation of the processed pipe. Shot blasting of pipes is carried out automatically.
To implement the claimed method also use a device for coating the outer surface of the pipe, which contains fixed and movable along the longitudinal axis of the pipe supports with rollers, a drive for rotating the pipe relative to its longitudinal axis, a cart with running wheels, a drive for moving it along the rail along the pipe being processed and a trolley mounted installation for coating it or its spray gun. As a coating installation, a high pressure airless spray installation is used. The spray of the specified installation is located in the center of the axis of rotation of the processed pipe, mounted on a rack with the ability to move in horizontal and vertical planes, which allows you to process pipes of various diameters. One of the bearings with rollers is made movable in the direction of the longitudinal axis of the pipe to compensate for differences in the lengths of the pipes for reuse.
These sets of features provide high quality preparation of the pipe surface for coating, high productivity at a low cost of work, reducing the time gap between cleaning the pipe and applying an insulating coating to its outer surface, since all the operations of the method are carried out in basic conditions where stream production is established , which in turn improves the quality of the insulation coating.
The repaired and insulated pipes are transported to the gas pipeline route, where they are mounted within the boundaries of the repaired section. The equipment of the workshop can be easily dismantled and quickly assembled again if it is necessary to relocate the equipment to another major overhaul of the main gas pipeline.
The claimed group of inventions is illustrated by photographs, where in FIG. 1 shows a device for heating pipes; in FIG. 2 shows a device for cleaning the outer surface of pipes. Positions indicate the following elements:
1 - pipe;
2 - a stub;
3 - a stub;
4 - shell;
5 - bottom;
6 - fixing elements;
7 - a device for burning fuel;
8 - sleeve for removal of the coolant;
9 - supports with rollers for basing the pipe;
10 - control cabin;
11 - trolley;
12 - drive moving the cart;
13 - rail track;
14 - shot blasting apparatus;
15 - vacuum system for abrasive suction and dusty waste removal;
16 - arrow;
17 - sealing nozzle;
18 - sealing elements.
The pipe 1 enters the preheating section, where plugs 2 and 3 are installed and fixed on its ends (see Fig. 1). The plugs 2, 3 contain a shell 4 covering the outer surface of the pipe 1 and a bottom 5 which is hermetically connected to it, in which the technological hole is made. In addition, on the specified bottom fixed elements of the fixing 6 of the pipe 1 at the position of its heating.
A device for burning fuel 7 with a burner sealed in the process hole for supplying coolant inside the pipe 1 is mounted on the plug 2. A sleeve for removing the coolant 8 is tightly fixed on the plug 3 in the process hole. Gaseous products of fuel combustion, for example, diesel, are used as the coolant . The pipe 1 is preheated using, for example, a Baltur BTL-26 diesel burner (see www.baltur.su/prod/disel/btl/BTL26.html).
The temperature of the outer surface of the pipe is 60 ± 10 degrees C.
After pre-heating the pipe 1 using a crane beam serves on supports with rollers 9 to the end stop (not shown) and give the pipe rotation around its longitudinal axis. Management and control of the finishing of the outer surface of the pipe 1 is carried out from the control cabin 10. On a trolley 11 with running wheels (not shown) and a drive for moving it 12 along the rail 13 along the pipe being machined 1, a shot blasting machine 14 with a control cabin 10, vacuum is mounted a system for suctioning and removing dusty and abrasive wastes 15. A working head (not shown) for cleaning the outer surface of the pipe 1 is located on the boom 16 and is equipped with a sealing nozzle 17 with the possibility of pressing it against the outer th surface of the processed pipe 1, while the sealing elements 18 of the specified nozzle are made in the form of brushes made of elastic steel wires, which eliminates the ingress of pipe cleaning products into the working area. The location of the rollers on the supports provides reliable basing of pipes of various diameters on the supports. The processed pipe 1 interacts with the end stop and is based on the rollers of these supports with an inclination towards the end stop at an angle of 0.3-1 degrees, which eliminates the axial movement of the pipe during its finishing.
The position of the working head and the sealing nozzle is regulated by the location of the boom 16, while the head is installed in the center of the axis of rotation of the processed pipe 1, regardless of its diameter. Shot blasting of the pipe is carried out automatically from the end opposite the end stop in order to exclude axial movement of the pipe and the possibility of it coming off the support rollers.
As a shot blasting apparatus, for example, the apparatus “VB 100 - C” is used (see www. Blastspray.ru). The shot blasting apparatus uses steel shot SR710. The degree of cleaning of the outer surface of the pipe at the outlet of the specified device corresponds to Sa
Figure 00000001
according to ISO 8501-1, the roughness of the outer surface of the pipe Rz 62-89 microns, with the norm: Rz 40-100 microns according to ISO 8503-4. The dust level at the outlet corresponds to the third class according to ISO 8502-3.
After finishing the pipe 1 using a crane beam is moved to the coating area and served on supports with rollers and a pipe rotation drive relative to its longitudinal axis, where the pipe is rotated around its longitudinal axis. The location of the rollers on the supports provides reliable basing of pipes of various diameters on the supports. One of the roller bearings in the direction of the longitudinal axis of the pipe is movable to compensate for differences in the lengths of the pipes for reuse. On a trolley with running wheels and a drive for moving it along a rail along the pipe being machined, a device is mounted for applying the coating pipe to the outer surface. Its spray is mounted on a rack with the ability to move in horizontal and vertical planes. The sprayer is installed in the zone of the center of the axis of rotation of the processed pipe, regardless of its diameter, which allows you to process pipes of various diameters: 530-1420 mm. It is possible to fasten only the sprayer of the installation to the indicated trolley to apply the coating pipe to the outer surface, the latter being a high-pressure airless spray installation.
When coating the outer surface of the pipe, said trolley moves along the pipe being processed along the rail track. Work on the application of the outer protective coating is carried out automatically on the basis of, for example, polyurethane - material "RPU-1021", which is a primerless system consisting of a two-component polyurethane mastic, applied with a thickness of at least 1.5 mm. The material "RPU-1021" is applied in a single layer by airless spraying with a high-pressure unit, which ensures dosing of the components in a predetermined ratio under a pressure of 80-150 kg / cm 2 . The mixture is sprayed using equipment for its automatic application under the following conditions:
- ambient temperature in the workshop 17-18 degrees C;
- temperature of components during application:
component A - 60 degrees C, component B - 30 degrees C;
- the temperature of the surface of the pipe before coating it is 25-30 degrees C.
The “RPU-1021” coating is applied using, for example, the Graco Hydro-Cat installation (see www / graco.com / en / products / coatings-and-foam / hydra-cat-fixed-ratio.html).
The repaired and insulated pipes are transported to the gas pipeline route, where they are mounted within the boundaries of the repaired section.
The application of pipes, for example, re-use, polyurethane coating in workshop conditions in the immediate vicinity of major gas pipeline overhaul facilities, can significantly increase the use of re-use pipes, improve the quality of work compared to route re-insulation, eliminates the climatic effect on insulation work and reduces the cost of major repairs in comparison with the use of new pipes with factory anticorrosive coating. The equipment of the workshop can be easily dismantled and mounted again if it is necessary to relocate the equipment to another major overhaul of the main gas pipeline.

Claims (7)

1. The method of coating the outer surface of the pipes, in which, under basic conditions, the pipes are pre-cleaned, pre-heated, followed by the finishing treatment of the outer surface of the pipes by shot blasting, the outer surface of the pipes is isolated by applying a protective coating by airless spraying, while the external finish is finished the surface of the pipe and coating it is carried out automatically when each pipe rotates about its longitudinal axis and longitudinal, relative relative to the pipe, translational movement along the rail of the bogies on which, respectively, the shot blasting apparatus of the outer surface of the pipe and the installation for coating it or its atomizer are placed, and each pipe is heated by supplying a coolant inside the pipe, for which they are installed on its ends and fasten plugs with technological holes for supplying and discharging coolant.
2. The method according to p. 1, in which gaseous products of the combustion of fuel, for example diesel, are used as a heat carrier.
3. A device for heating a pipe with gaseous products of fuel combustion, which contains metal plugs installed and fixed at the ends of the pipe, each of which contains a shell covering the outer surface of the pipe and a hermetically connected bottom with technological holes, while a device for burning is mounted on one plug fuel with a burner hermetically placed in the technological hole for supplying coolant, and on the other plug - hermetically fixed in the hole for the removal of heat plonositelya sleeve, wherein on said bottoms of fixing elements attached to the pipe heating station.
4. A device for shot blasting the outer surface of the pipe, which contains two fixed bearings with rollers, a drive for rotating the pipe relative to its longitudinal axis, an end stop, a cart with wheels, a drive for moving it along a rail along the pipe being machined, a shot blasting machine mounted on a cart with a cab control system, vacuum system for suction and removal of dusty and abrasive waste, the working head for cleaning the outer surface of the pipe is placed on the boom and is equipped with a sealing nozzle with air ozhnostyu it is pressed to the outer surface of the treated tube, wherein said blade sealing elements are in the form of steel brushes elastic wires.
5. The device according to p. 4, in which, to exclude axial movement during finishing of the pipe, the latter interacts with the end stop and is based on the rollers of these supports with an inclination towards the end stop at an angle of 0.3-1 degrees.
6. A device for applying a coating to the outer surface of a pipe, which comprises roller bearings with a pipe rotational drive relative to its longitudinal axis that is stationary and movable along the longitudinal axis of the pipe, a trolley with running wheels, a drive for moving it along a rail along the pipe being machined, and an installation mounted on the truck high pressure airless spray to coat it or its spray gun.
7. The device according to claim 6, in which the spray of the installation for coating the outer surface of the pipe is mounted on a rack with the possibility of movement in horizontal and vertical planes.
RU2017117589A 2017-05-22 2017-05-22 Method of coating application on pipe outer surface and device for implementation thereof RU2704392C2 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2267692C1 (en) * 2004-06-23 2006-01-10 Эдуард Патваканович Багдасарян Complex of equipment for insulation of welding joints of pipes
RU2443934C1 (en) * 2010-12-15 2012-02-27 Общество с ограниченной ответственностью "НПО "Газстройинновация" Application method of insulating coating on outer surface of pipeline, and devices for its implementation
RU2462653C1 (en) * 2011-09-19 2012-09-27 Общество с ограниченной ответственностью "НПО "Газстройинновация" Method to repair pipeline, complex of equipment for realisation of method and its devices
RU2602941C2 (en) * 2015-03-24 2016-11-20 Общество с ограниченной ответственностью"Газстройинновация" Pipes repair mobile base, its production line and test bench for preparation of pipes ends edges

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2267692C1 (en) * 2004-06-23 2006-01-10 Эдуард Патваканович Багдасарян Complex of equipment for insulation of welding joints of pipes
RU2443934C1 (en) * 2010-12-15 2012-02-27 Общество с ограниченной ответственностью "НПО "Газстройинновация" Application method of insulating coating on outer surface of pipeline, and devices for its implementation
RU2462653C1 (en) * 2011-09-19 2012-09-27 Общество с ограниченной ответственностью "НПО "Газстройинновация" Method to repair pipeline, complex of equipment for realisation of method and its devices
RU2602941C2 (en) * 2015-03-24 2016-11-20 Общество с ограниченной ответственностью"Газстройинновация" Pipes repair mobile base, its production line and test bench for preparation of pipes ends edges

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