KR101193306B1

KR101193306B1 - Method for cleaning a pipeline using cleaning system

Info

Publication number: KR101193306B1
Application number: KR20100069062A
Authority: KR
Inventors: 김성열; 김형신
Original assignee: 주식회사 유벡
Priority date: 2010-07-16
Filing date: 2010-07-16
Publication date: 2012-10-19
Also published as: KR20120008286A

Abstract

In the present invention, one end is located on the seabed, the other end in the subsea pipe washing apparatus for washing the pipe to be washed connected to the land, buoyancy unit is installed to float on the sea, connected to the other end of the pipe to be cleaned. It is installed, the inside of the pig input section, the pig input section is provided with the pig injected into the pipe to be cleaned, the cleaning fluid supply unit, buoyancy part to supply the cleaning fluid to be used for the cleaning of the pipe to be cleaned inside the pig input section And connected to one end of the pipe to be cleaned and the pig input to the other end of the pipe to be cleaned through one end of the pipe to be cleaned or to the other end of the pipe to be cleaned through the inside of the pig input pipe while being installed on the ground, respectively. With the first and second compressed air supply unit, buoyancy unit and land installed to push the inner pig and the cleaning fluid to be cleaned while reciprocating the inside of the pipe to be cleaned. First and second fluid storage parts connected to one end of the pipe to be cleaned and the pig input portion, and receives and stores the fluid discharged through one end of the pipe to be cleaned or the other end of the pipe to be cleaned by the movement of the pig And a gas discharge part installed in the buoyancy part and venting and drying the pipe to be cleaned while suctioning and discharging the gas inside the pipe to be cleaned while the pigs are reciprocated by the first and second compressed air supply parts, and the first compression. The air supply unit, the gas discharge unit, the first fluid storage unit provides a subsea pipe washing apparatus including a connection line to be connected to one end of the pipe to be cleaned.

Description

Method for cleaning a pipeline using cleaning system

The present invention relates to a subsea pipe washing apparatus and a washing method using the same, and to a subsea pipe washing apparatus for washing the inside of the portion located in the seabed of the pipe for transferring crude oil to the land and a cleaning method using the same.

In general, pipes for various uses for transferring fluids generate foreign substances such as scales or slimes generated on the inner wall of the pipes due to the fluid flowing therein as they are used for a long time. Therefore, the ductile scale or slime generated in the pipe prevents the fluid transfer inside the pipe and contaminates the fluid or corrodes the pipe, causing water leakage and reducing the life of the pipe. It will require cleaning.

In such a pipe washing method, a brush is inserted, a chemical agent or organic acid having strong dissolving power, or a method of spraying high pressure water, sand or ultrasonic waves is used. However, such a conventional pipe washing method is difficult to apply when the length is long while being located on the sea floor like crude oil pipe, and there is a fear that the old pipe may cause damage to the pipe itself.

An object of the present invention is to provide a subsea pipe washing apparatus and a cleaning method using the same, which can easily clean a long length of pipe in a state installed on the sea bed.

The present invention, in the subsea pipe washing apparatus for washing the pipe to be washed to the other end connected to the land while the other end is located on the seabed, buoyancy unit installed to float on the sea, and the other end of the pipe to be cleaned It is connected to the inside, the pig input unit is provided with a pig which is introduced into the washing target pipe inside, the pig input is connected to the pig injection unit, supplying the cleaning fluid to be used for cleaning the washing target pipe into the pig input unit Is connected to the cleaning fluid supply unit, the buoyancy portion and the land, respectively, one end of the pipe to be washed and the pig injection portion, one end of the pipe to be washed or the pig through the inside of the pig injection portion While supplying compressed air to the other end of the target pipe, the inside of the pig injection section pushes the pig and the cleaning fluid to reciprocate the inside of the pipe to be cleaned The first and second compressed air supply unit to be washed while moving, and connected to one end of the pipe to be cleaned and the pig input portion in the state of being installed on the buoyancy portion and the land, the object to be washed by the movement of the pig First and second fluid storage unit for receiving and storing the fluid discharged through one end of the pipe or the other end of the pipe to be cleaned, and is installed in the buoyancy portion, by the first and second compressed air supply A gas discharge unit for ventilating and drying the cleaning target pipe while suctioning and discharging the gas inside the cleaning target pipe while the pig is reciprocated, and the first compressed air supply unit, the gas discharge unit, and the first fluid storage unit. It provides a subsea pipe washing apparatus including a connection line to be connected to one end of the pipe to be cleaned.

In addition, according to another aspect of the present invention, in the washing method using the subsea pipe cleaning device for washing the pipe to be washed connected to the ground while the other end is located on the seabed, the buoyancy portion floating on the sea The first compressed air supply unit, the gas discharge unit and the first fluid storage unit is connected to one end of the pipe to be cleaned by a connecting line, and the other end of the pipe to be washed is connected to the pig injection unit in the state of coupling fluid Connecting and installing a supply unit, a second compressed air supply unit, and a second fluid storage unit, and after the pig is injected into the pig input unit, the pigs are washed by the second compressed air supply unit and the first compressed air supply unit. While discharging the fluid inside the pipe to be cleaned to the first fluid storage part and the second fluid storage part while reciprocating the pipe and the pig input part. After the pig, the first washing fluid and the third washing fluid are put into the pig feeding portion, the first washing fluid is connected to the pipe to be cleaned by the second compressed air supply part and the first compressed air supply part. Washing while reciprocating and putting the pig and the second washing fluid into the pig input portion, the second washing fluid by the second compressed air supply unit and the first compressed air supply unit the pipe to be cleaned Washing while reciprocating, and after the pig and the third washing fluid is put into the pig feeding portion, the third washing fluid by the second compressed air supply unit and the first compressed air supply unit the pipe to be cleaned. Washing while reciprocating, and after putting the pig into the pig input unit, the pig by the second compressed air supply unit and the first compressed air supply unit is the pipe to be washed and the pig two Discharging and removing residual fluid inside the cleaning target pipe to the first fluid storage unit and the second fluid storage unit while reciprocating the unit, and supplying dry air to the inside through the other end of the cleaning pipe; The drying air is discharged to the outside while passing through the inside of the washing target pipe by the gas discharge unit, and provides a washing method using a subsea pipe washing apparatus comprising drying and ventilating the inside of the washing target pipe.

In the subsea pipe washing apparatus according to the present invention, the washing fluid supplied from the pig and the washing fluid supply by the first compressed air supply unit and the second compressed air supply unit is washed while reciprocating the inside of the pipe to be cleaned, installed on the seabed The long length of pipe in the state can be easily performed cleaning.

In addition, the washing method using the subsea pipe washing apparatus according to the present invention, after removing the fluid by the reciprocating movement of the pig by the first compressed air supply unit and the second compressed air supply unit, the pig and the cleaning fluid is again inside the pipe to be cleaned After being sequentially washed while reciprocating, the ventilation and drying are performed by the drying air, so that a long length of pipe can be easily washed while being installed on the sea floor.

1 is a schematic configuration diagram of a subsea pipe washing apparatus according to an embodiment of the present invention.
FIG. 2 is a detailed configuration diagram of FIG. 1.
Figure 3 is a flow chart of the washing method using a subsea pipe washing apparatus according to an embodiment of the present invention.
4 and 5 are state diagrams illustrating step S2 of FIG. 3.
6 to 14 are state diagrams illustrating step S3 of FIG. 3.
15 to 18 are state diagrams illustrating step S4 of FIG. 3.
19 to 22 are state diagrams illustrating step S5 of FIG. 3.
23 and 24 are state diagrams illustrating step S6 of FIG. 3.
FIG. 25 is a state diagram illustrating step S7 of FIG. 3.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings.

1 is a schematic configuration diagram of a subsea pipe washing apparatus according to an embodiment of the present invention, Figure 2 is a detailed configuration diagram of FIG. 1 and 2, the subsea pipe cleaning device, buoyancy unit 100, pig injection unit 200, washing fluid supply unit 400, the first compressed air supply unit 400, the second compressed air supply unit 500, the first fluid storage part 600, the second fluid storage part 700, the gas discharge part 800, and the connection line 900 are provided, and the other end thereof is located on the sea floor. It is to wash the inside of the long washing target pipe 10, such as an oil pipe connected to the land.

The buoyancy portion 100 is a portion that is installed to float on the sea. The buoyancy unit 100 is provided with the first compressed air supply unit 400, the first fluid storage unit 600, the gas discharge unit 800 to be described later, each of the first compressed air supply unit 400, the first fluid storage unit 600, the gas discharge unit 800 may be easily connected to one end located on the seabed of the pipe 10 to be cleaned through the connection line 900 which will be described later. To be located at sea.

The pig injection unit 200 is provided with a pig (Pig, 20) to perform cleaning while reciprocating the inside of the pipe 10 to be cleaned. The pig input 200 is connected to the other end of the pipe 10 to be washed to be located on the land. Here, the pig input part 200 includes a temporary pipe 210, a launch pad 220, a pig sensor 230.

The temporary pipe 210 is a pipe member for connecting the launch pad 220 to the other end of the pipe 10 to be cleaned. This, one end of the hypothesis pipe 210 is coupled to the other end of the washing target pipe 10, the other end is connected to one end of the launch pad 220.

The launch pad 220 is a tubular member into which the pig 20 that is moved into the washing target pipe 10 is inserted. This, one end of the launch pad 220 is coupled to the other end of the temporary pipe 210. In addition, an opening 221 is provided to allow the pig 20 to be introduced into the inside while opening and closing the other end of the launch pad 220.

The pig sensor 230 detects the pig 20 moving inside the temporary pipe 210 and the launch pad 220. The pig sensor 230 is provided with a plurality of spaced apart on one side of the temporary pipe 210 and the launch pad 220. Here, the pig sensor 230 controls the compressed air supply operation to the inside of the launch pad 220 of the second compressed air supply unit 500 to be described later according to the position of detecting the pig 20. That is, the pig sensor 230 may stop the supply of compressed air into the launch pad 220 when the pig 20 moving by the second compressed air supplier 500 is detected at a predetermined position. To be.

The washing fluid supplying part 300 supplies the washing fluid to be washed into the pig feeding part 200 while being reciprocated to the washing target pipe 10 together with the pig 20. This, the cleaning fluid supply unit 300 is connected to one side of the pig input unit 200 in a state installed on the land. Here, the washing fluid supply unit 300 includes a washing fluid storage tank 310, a washing fluid connecting pipe 320, and a first opening / closing valve 330.

The washing fluid storage tank 310 stores the washing fluid to be supplied to the pig inlet 200 in a state where it is installed on the land. Such, the plurality of washing fluid storage tank 310 is installed on the land, each different washing fluid is stored in each of the washing fluid storage tank (310). Here, the washing fluid stored in each of the washing fluid storage tank 310 may be one of a fluid mixed with kerosene and cocosol, a fluid mixed with a degreasing agent in seawater, or industrial water, but is not limited thereto. Of course not.

The washing fluid connection pipe 320 is a plurality of pipe members for each of the washing fluid storage tank 310 to be connected to the inside of the launch pad 220 of the pig injection unit 200. This, one end of the washing fluid connection pipe 320 is connected to one side of the washing fluid storage tank 310, the other end is connected to one side of the launching unit 220 of the pig injection unit 200. .

Whether the first opening / closing valve 330 is delivered to the launch pad 220 of the pig injection part 200 through the washing fluid connecting pipe 320 of the washing fluid stored in the washing fluid storage tank 320 To control the valve. The first opening / closing valve 330 is installed at one side of the washing fluid connecting pipe 320 connecting the washing fluid storage tank 310 to the launch pad 220 of the pig feeding part 200. The cleaning fluid connection pipe 320 is opened and closed.

The first compressed air supplying unit 400 and the second compressed air supplying unit 500 are one end of the washing target pipe 10 or the washing target pipe through the inside of the launch pad 220 of the pig injection unit 200. Supply the compressed air to the other end of (10). That is, the pig 20 introduced into the launch pad 220 of the pig injection unit 200 by the compressed air generated by the first compressed air supply unit 400 and the second compressed air supply unit 500 and As the washing fluid is pushed, the washing is performed by reciprocating the inside of the washing target pipe 10.

Here, the first compressed air supply unit 400 is a portion for supplying compressed air to one end of the pipe 10 to be cleaned. That is, the first compressed air supply unit 400 is then compressed air so that the pig 20 located inside the washing target pipe 10 can move from one end of the washing target pipe 10 to the other end. Will be generated. The first compressed air supply unit 400 is connected to the connection line 900 to be described later in a state in which the first compressed air supply unit 400 is mounted on the buoyancy unit 100, and the compressed air generated by the connection line 900 is connected to the connection line 900. It is supplied to the washing target pipe 10 through. The first compressed air supply unit 400 includes a first compressor 410, a first compressed air connection pipe 420, and a second open / close valve 430.

The first compressor 410 generates compressed air to be supplied to one end of the pipe 10 to be cleaned. The first compressor 410 is connected to the first compressed air connecting pipe 420 while being fixedly installed on the buoyancy unit 100.

The first compressed air connector pipe 420 connects the first compressor 410 and the connection line 900 to be described later, so that the compressed air generated in the first compressor 410 is connected to the connection line ( 900 to guide the pipe to be moved to the pipe 10 to be washed. One end of the first compressed air connector tube 420 is connected to the first compressor 410, and the other end thereof is connected to the connection line 900.

The first opening / closing valve 430 is a valve for controlling the supply of the compressed air generated through the first compressor 410 to one end of the pipe 10 to be cleaned through the connection line 900. The first opening / closing valve 430 is installed at one side of the first compressed air connecting pipe 420 connecting the first compressor 410 to the connection line 900, and thus the first compressed air. The connection pipe 420 is opened and closed.

The second compressed air supply unit 500 is a portion for supplying compressed air to the other end of the pipe 10 to be cleaned. That is, the second compressed air supply unit 500 is the other end of the pipe 10 to be washed through the inside of the pig 20, the pig 20 is located inside the pig input 200 Compressed air is generated to move from one stage to the other. The second compressed air supply unit 500 is connected to one side of the launch pad 220 of the pig input unit 200 in a state in which the second compressed air supply unit 500 is fixed to the land, and the compressed air generated is the pig input unit 200. It is supplied to the washing target pipe 10 through. Here, the second compressed air supply unit 500 includes a second compressor 510, a second compressed air connection pipe 520, and a third open / close valve 530.

The second compressor 510 generates compressed air to be supplied to the other end of the pipe 10 to be cleaned. The second compressor 510 is connected to the second compressed air connection pipe 520 in a state where it is fixed to the land.

The second compressed air connection pipe 520 connects the launch pad 220 of the second compressor 510 and the pig injection part 200 to the compressed air generated by the second compressor 510. It is a pipe for guiding the inside of the launching unit 220 of the pig injection unit 200. One end of the second compressed air connector tube 520 is connected to the second compressor 510, and the other end thereof is connected to one side of the launch pad 220 of the pig insertion part 200.

The second open / close valve 530 controls whether the compressed air generated through the second compressor 510 is supplied to the other end of the pipe 10 to be cleaned through the second compressed air connection pipe 520. It is a valve. The second opening / closing valve 530 is installed at one side of the second compressed air connecting pipe 520 connecting the second compressor 510 to the launch pad 220 of the pig injection part 200. The opening and closing of the second compressed air connection pipe 520 is performed.

As such, the compressed air generated by the second compressed air supply unit 500 pushes the pig 20 introduced into the launching unit 220 of the pig injection unit 200 in the sea direction, and the pig 20 is The other end of the pipe 10 to be cleaned is moved to one end. Then, the compressed air generated by the first compressed air supply unit 400, while pushing the pig 20 located at one end inside the washing target pipe 10 in the land direction, the washing target pipe 10 After moving to the other end of the, it is to be moved again to be located in the launch pad 220 of the pig injection section 200. Therefore, while the pig 20 is reciprocated from one end to the other end of the inside of the pipe 10 to be cleaned by the first and second compressed air supply units 500, the pig 20 The fluid or foreign matter inside the washing target pipe 10 is discharged or discharged, and may be stored in the first fluid storage unit 600 or the second fluid storage unit 700 which will be described later.

The first fluid storage unit 600 and the second fluid storage unit 700 receives and stores the fluid discharged through one end of the pipe 10 to be cleaned or the other end of the pipe 10 to be cleaned. do. That is, as described above, the first fluid storage unit 600 and the second fluid storage unit 700 are reciprocated by the first compressed air supply unit 400 and the second compressed air supply unit 500. To receive and store the fluid inside the cleaning target pipe 10 or the cleaning fluid used for cleaning the inside of the cleaning pipe 10 to be moved in accordance with the movement of the pig 20.

Here, the first fluid storage unit 600 is a portion for storing the fluid discharged from one end of the pipe 10 to be cleaned. That is, the first fluid storage unit 600 is connected to the fluid in the cleaning pipe 10 to be pushed by the pig 20 moving from one end to the other end of the pipe 10 for cleaning the connection line Received through the 900 will be stored. The first fluid storage unit 600 is connected to the connection line 900 in a state of being installed on the buoyancy unit 100, the fluid discharged from one end of the pipe 10 to be cleaned. Will be saved. Here, the first fluid storage unit 600 includes a first fluid storage tank 610, a first fluid connection pipe 620, and a fourth open / close valve 630.

The first fluid storage tank 610 stores the fluid discharged from one end of the pipe 10 to be cleaned. The first fluid storage tank 610 is connected to the connection line 900 by the first fluid connection pipe 620 while being installed in the buoyancy unit 100.

The first fluid connection pipe 620 connects the first fluid storage tank 610 and the connection line 900 to be described later, while being discharged from one end of the pipe 10 to be cleaned, the connection line 900. The fluid is moved through the tube to guide the delivery to the first fluid reservoir (610). One end of the first fluid connection pipe 620 is connected to the first fluid storage tank 610 and the other end is connected to the connection line 900.

The fourth opening / closing valve 630 is a valve for controlling whether or not the fluid is delivered to the first fluid storage tank 610 on the connection line 900. The fourth opening / closing valve 630 is installed at one side of the first fluid connection pipe 620 for connecting the first fluid storage tank 610 to the connection line 900, and the first fluid connection. The tube 620 is opened and closed.

The second fluid storage part 700 is a part for storing the fluid discharged from the other end of the pipe 10 to be cleaned. That is, the second fluid storage unit 700 is a fluid and the washing fluid in the washing target pipe 10 which is pushed by the pig 20 moving from one end of the washing target pipe 10 to the other end. It is received and stored through the pig input unit 200. The second fluid storage unit 700 is connected to the pig input unit 200 in a state of being installed on the land, and stores the fluid discharged from the other end of the pipe 10 to be cleaned. Here, the second fluid storage unit 700 includes a second fluid storage tank 710, a second fluid connection pipe 720, and a fifth open / close valve 730.

The second fluid storage tank 710 is discharged from the other end of the pipe 10 to be washed, and stores the fluid and the cleaning fluid transferred to the pig input 200. The second fluid storage tank 710 is connected to the launch pad 220 of the pig input part 200 by the second fluid connection pipe 720 in a state installed on the land.

The second fluid connection pipe 720 connects the second fluid storage tank 710 and the launch pad 220 of the pig input part 200 to be discharged from the other end of the pipe 10 to be cleaned, and thus the pig The fluid is moved to the launch pad 220 of the inlet 200 is a tube for guiding the delivery to the second fluid reservoir 710. One end of the second fluid connection tube 720 is connected to the second fluid storage tank 710, and the other end is connected to the launch pad 220 of the pig injection unit 200.

The fifth opening / closing valve 730 is a valve for controlling whether or not the fluid is transferred to the inside of the second fluid storage tank 710 on the launch pad 220 of the pig injection part 200. The fifth opening and closing valve 730 is installed at one side of the second fluid connection pipe 720 connecting the second fluid storage tank 710 to the launch pad 220 of the pig injection part 200. The second fluid connection tube 720 is opened and closed.

The gas discharge unit 800 allows the first and second compressed air supply units 400 and 500 to reciprocate the pig 20 so as to suck and discharge the gas inside the washing target pipe 10 that has been cleaned. do. That is, the gas discharge unit 800 by ventilating the inside of the washing target pipe (10) to be cleaned by removing the gas, such as vapor, to ensure safety when the worker enters the pipe 10 and the washing target pipe (10) ) To dry inside. The gas discharge part 800 is connected to one end of the pipe 10 to be cleaned through the connection line 900 in a state of being installed in the buoyancy part 10. Here, the gas discharge part 800 includes a blower 810, a discharge gas connecting pipe 820, and a sixth open / close valve 830.

The blower 810 generates a suction force to suck and discharge the gas inside the cleaning target pipe 10. The blower 810 is connected to the washing target pipe 10 through the discharge gas connection pipe 820 and the connection line 900 in a state in which the blower 810 is fixed to the buoyancy sphere 100.

The exhaust gas connection pipe 820 connects the blower 810 and the connection line 900 to be described later, and the suction force generated by the blower 810 is the washing target through the connection line 900. It is a pipe to guide the delivery to the pipe (10). One end of the exhaust gas connection pipe 820 is connected to the blower 810 and the other end is connected to the connection line 900.

The sixth opening / closing valve 830 is a valve for controlling whether the suction force generated through the blower 810 is transferred to the one end of the pipe 10 to be cleaned through the connection line 900. The sixth opening / closing valve 830 is installed at one side of the exhaust gas connecting pipe 820 for connecting the blower 810 with the connection line 900 to connect the exhaust gas connecting pipe 820. It is opened and closed.

Such, the washing target pipe 10, the air dryer 840 to be supplied to the dry air in the heated state to the other end of the washing target pipe 10 so that the inside of the washing target pipe 10 can be easily dried. It may be provided. The air dryer 840 is connected to the other end of the pipe 10 to be cleaned in a state of being installed on the land. Therefore, when the gas inside the cleaning target pipe 10 is sucked by the blower 810 described above, the dried body in a heated state is operated inside the cleaning target pipe 10 while operating the air dryer 840. After passing through, it is possible to easily dry the inside of the washing target pipe 10 while being discharged to the outside through the connection line 900.

The connection line 900 allows the first compressed air supply unit 400, the first fluid storage unit 600, and the gas discharge unit 800 to be connected to one end of the pipe 10 to be cleaned. The connection line 900 includes a marine connection pipe 910 and a seventh open / close valve 920.

The maritime connection pipe 910 is a pipe connecting the first compressed air supply unit 400, the first fluid storage unit 600, and the gas discharge unit 800 to one end of the pipe 10 to be cleaned. It is a shape connecting member. Here, the maritime connecting pipe 910 may of course form a multi-pipe structure to facilitate the movement of the fluid or gas.

The seventh open / close valve 920 may include the first compressed air supply unit 400, the first fluid storage unit 600, and the gas discharge unit installed in the pipe 10 to be cleaned and the buoyancy unit 100. 800 is connected or not. The seventh opening and closing valve 920 opens and closes the marine connection pipe 910 in a state where it is installed at one side of the marine connection pipe 910.

As such, the apparatus for cleaning the seabed pipe according to the embodiment may be formed by the first compressed air supply unit 400 and the second compressed air supply unit 500 in the pig 20 and the cleaning fluid supply unit 300. The supplied washing fluid is washed while reciprocating the inside of the pipe 10 to be cleaned, and thus a long length of pipe in a state of being installed on the sea floor can be easily performed.

1 to 25, the process of washing using the subsea pipe washing apparatus according to an embodiment of the present invention will be described in detail.

Figure 3 is a flow chart showing a washing method using a subsea pipe washing apparatus according to an embodiment of the present invention. Referring to FIG. 3, the washing method using the subsea pipe washing apparatus includes a pig input unit 200, a washing fluid supply unit 300, and first and second compressed air supply units 400 at one end and the other end of the washing target pipe. 500, the first and second fluid storage units 600 and 700, connecting and installing the connection line 900, removing the fluid inside the washing target pipe 10, and washing by the first washing fluid. Washing the target pipe (10), washing the target pipe (10) by the second washing fluid, washing the target pipe (10) by the third washing fluid, the target pipe (10) Removing residual fluid therein; and drying and ventilating the inside of the pipe 10 to be cleaned.

First, in the state where one end is located on the seabed, the other end is on the buoyancy unit 100 floating on the sea using the connection line 900 at one end of the pipe 10 to be cleaned connected to the land. The first compressed air supply unit 400, the gas discharge unit 800, and the first fluid storage unit 600 are installed to be installed.

The other end of the pipe 10 to be washed is connected to the pig input 200 so that the pig 20 can be introduced into the pipe 10 to be cleaned. In addition, the cleaning fluid supply unit 300, the second compressed air supply unit 500, and the second fluid storage unit 700 are installed to be connected to the pig injection unit 200. Here, the pig input unit 200 is provided with a hypothetical piping 210 and the launch pad 220 of the tubular shape provided with an injection hole 221 to input the pig 20, first, the pipe to be cleaned One end of the temporary pipe 210 is connected to the other end of the coupling by a mutual flange portion (not shown). Thereafter, the other end of the temporary pipe 210 is connected to one end of the launch pad 220 by the coupling by the mutual flange.

Then, the step of removing the fluid inside the washing target pipe 10 is performed. That is, after the pig 20 is introduced into the pig input part 200, the pig 20 is piped to the washing object by the second compressed air supply part 500 and the first compressed air supply part 400. 10 and the pig injection section 200 to reciprocate. 4 and 5, the first pig 21 is introduced into the launch pad 220 of the pig input part 200. Thereafter, the second compressor 510 is operated while the third open / close valve 530 of the second compressed air supply unit 500 is opened, so that the generated compressed air is a launch pad 220 of the pig input unit 200. ), The first pig 21 is moved from one end to the other end of the pipe 10 to be cleaned while pushing the fluid inside the pipe 10 to be cleaned to the connection line 900. Let it drain.

As such, the fluid discharged to the connection line 900 is moved and stored in the first fluid storage unit 600. That is, the fluid on the connection line 900 is opened through the first fluid connection pipe 620 by opening the fourth opening / closing valve 630 of the first fluid storage part 600. It is moved and stored inside.

Thereafter, the first compressor 410 is operated while the second opening / closing valve 430 of the first compressed air supply unit 400 is opened, so that the generated compressed air is connected to the first compressed air connection pipe 420. After being supplied to the connection line 900 through, and supplied to one end of the washing target pipe 10, the first pig 21 is moved from one end of the washing target pipe 10 to the other end While pushing the fluid inside the washing target pipe 10 again, the launching unit 220 of the pig injection unit 200 is moved.

In this way, the fluid discharged to the launch pad 220 of the pig injection unit 200 is moved to the second fluid storage unit 700 is stored. That is, as the fifth opening and closing valve 730 is opened, the fluid inside the launch pad 220 is moved and stored in the second fluid storage tank 710 through the second fluid connection pipe 720.

As such, when the fluid inside the cleaning target pipe 10 is discharged to the first and second fluid storage parts 600 and 700 by the first pig 21, the fluid is transferred to the first washing fluid 30. Clean the inside of the washing target pipe (10). That is, after the pig 20, the first washing fluid 30 and the third washing fluid 32 are introduced into the launch pad 220 of the pig feeding part 200, the second compressed air supply unit ( 500) and the first compressed air supply unit 400 to perform the washing operation while reciprocating the cleaning target pipe 10. In this case, the first washing fluid 30 is a fluid in which kerosene and Kocosol are mixed, and the third washing fluid 32 is industrial water. 6 to 14, first, as shown in FIG. 6, the second pig 22 is introduced into the launch pad 220 of the pig feeding part 200, and the second compression is performed as described above. The compressed air is supplied from the air supply unit 500 into the launch pad 220 of the pig input unit 200, and the second pig 22 is supplied into the pig input unit 200. Allow a certain distance to move in the direction. Thereafter, as shown in FIG. 7, the third pig 23 is introduced into the launch pad 220 of the pig injection unit 200, and the compressed air is supplied from the second compressed air supply unit 500 as described above. It is supplied into the launch pad 220 of the input unit 200 to move the third pig 23 a certain distance from the inside of the pig input unit 200 toward the cleaning target pipe 10. In this case, the third pig 23 moves to be spaced apart from the rear of the second pig 22 in the pig feeding part 200.

Thereafter, as shown in FIG. 8, in the washing fluid supply unit 300, the third washing fluid 32 is positioned between the second pig 22 and the third pig 23. Supply to the launch pad 220 of. That is, by opening the first opening and closing valve 330 connected to the washing fluid storage tank 310 in which the third washing fluid 32 is stored, the third washing fluid 32 is connected to the second pig 22. The feeder 200 is supplied into the launch pad 220 of the pig feeder 200 so as to be positioned between the third pigs 23. Then, the second compressed air supply unit 500 supplies the compressed air into the launch pad 220 of the pig injection unit 200, so that the second pig 22, the third pig 23 and the second Three washing fluid 32 is moved a predetermined distance in the direction of the pipe 10 to be washed.

Then, as shown in FIG. 9, the fourth pig 24 is introduced into the launch pad 220 of the pig injection unit 200 again, and the compressed air is supplied from the second compressed air supply unit 500 as described above. It is supplied into the launch pad 220 of the pig injection unit 200, so that the fourth pig 23 is moved a predetermined distance in the direction of the cleaning target pipe 10 in the pig injection unit 200. In this case, the fourth pig 24 moves to be spaced apart from the rear of the third pig 23 in the pig feeding part 200.

Subsequently, as shown in FIG. 10, in the washing fluid supply unit 300, the first washing fluid 30 is positioned between the third pig 23 and the fourth pig 24. Supply to the launch pad 220 of. That is, by opening the first opening and closing valve 330 connected to the washing fluid storage tank 310 in which the first washing fluid 30 is stored, the first washing fluid 30 is connected to the third pig 23. The feeder 200 may be supplied into the launch pad 220 of the pig feeder 200 so as to be positioned between the fourth piglets 24. Then, the second compressed air supply unit 500 supplies the compressed air into the launch pad 220 of the pig injection unit 200, so that the fourth pig 24 and the first washing fluid 30 is A predetermined distance moves toward the washing target pipe 10 adjacent to the third pig 23.

Then, as shown in FIG. 11, the fifth pig 25 is introduced into the launch pad 220 of the pig injection unit 200 again, and the compressed air is supplied from the second compressed air supply unit 500 as described above. It is supplied into the launch pad 220 of the pig injection unit 200, so that the fifth pig 25 is moved a predetermined distance from the inside of the pig injection unit 200 toward the cleaning target pipe (10). In this case, the fifth pig 25 moves to be spaced apart from the rear of the fourth pig 24 in the pig feeding part 200.

In addition, as shown in FIG. 12, in the washing fluid supply unit 300, the third washing fluid 32 is positioned between the fourth pig 24 and the fifth pig 25. Supply to the launch pad 220 of. That is, by opening the first opening and closing valve 330 connected to the washing fluid storage tank 310 in which the third washing fluid 32 is stored, the third washing fluid 30 is connected to the fourth pig 24. The feeder 200 may be supplied into the launch pad 220 of the pig feeder 200 to be positioned between the fifth piglets 25. Thereafter, the second compressed air supply unit 500 supplies the compressed air into the launch pad 220 of the pig injection unit 200, thereby providing the second to the fifth and the fifth and the second and second pigments 22 and 25, respectively. 3, the first washing fluid 30, 32 is moved to one end of the pipe 10 to be washed.

When the second pig 22 reaches one end of the pipe 10 to be cleaned, as shown in FIG. 13, the third washing fluid is supplied by the compressed air applied by the second compressed air supply unit 500. 32 is discharged and stored in the first fluid storage unit 600 through the connection line (900). That is, by opening the fourth opening and closing valve 630 of the first fluid storage unit 600, the fluid on the connection line 900 and the third washing fluid 32 are connected to the first fluid connection pipe 620. Through the first fluid storage tank 610 is stored and moved.

Then, as shown in Figure 14, by operating the first compressor 410 in the open state the second open valve 430 of the first compressed air supply unit 400, the generated compressed air is connected to the first compressed air After being supplied to the connecting line 900 through the pipe 420, and supplied to one end of the pipe 10 to be washed, the second, third, fourth, fifth pigs (22, 23, 24, 25) And the first washing fluid 30 moves from one end of the washing target pipe 10 to the other end again to the launch pad 220 of the pig injection unit 200. As such, when the second, third, fourth, fifth piglets 22, 23, 24, 25 and the first washing fluid 30 are positioned on the launching unit 220 of the pig injection unit 200, more preferably, When the fifth pig 25 reaches the other end of the launch pad 220, the first washing fluid 30 is moved to the second fluid storage unit 700 is stored. That is, as the fifth opening / closing valve 730 is opened, the first washing fluid 30 inside the launch pad 220 passes through the second fluid connecting tube 720 to the second fluid storage tank 710. Are stored on the go.

As such, when the inside of the washing target pipe 10 by the first washing fluid 30 is completed, the inside of the washing target pipe 10 by the second washing fluid 31 is washed. That is, after the pig 20 and the second washing fluid 31 are introduced into the launching unit 220 of the pig feeding unit 200, the second compressed air supply unit 500 and the first compressed air The cleaning operation is performed while the reciprocating movement of the pipe 10 to be cleaned by the supply unit 400. Here, the second washing fluid 31 is a fluid in which degreaser is mixed with seawater. 15 to 18, first, as shown in FIG. 15, the sixth pig 26 is introduced into the launch pad 220 of the pig-inserting unit 200 and the second compression as described above. The compressed air is supplied from the air supply unit 500 into the launch pad 220 of the pig input unit 200, and the sixth pig 26 is disposed inside the pig input unit 200. Allow a certain distance to move in the direction. Thereafter, as shown in FIG. 16, the seventh pig 27 is introduced into the launch pad 220 of the pig feeder 200, and the compressed air is supplied from the second compressed air supply unit 500 as described above. It is supplied into the launch pad 220 of the input unit 200, so that the seventh pig 27 is moved a predetermined distance in the direction of the cleaning target pipe 10 in the pig input unit 200. In this case, the seventh pig 27 moves to be spaced apart from the rear of the sixth pig 26 in the pig feeding part 200.

Thereafter, as shown in FIG. 17, in the washing fluid supply unit 300, the second washing fluid 31 is positioned between the sixth pig 26 and the seventh pig 27 and the pig feeding part 200. Supply to the launch pad 220 of. That is, the first cleaning valve 330 connected to the washing fluid storage tank 310 in which the second washing fluid 31 is stored opens the second washing fluid 31 to the sixth pig 26. It is to be supplied into the launch pad 220 of the pig injection portion 200 to be located between the seventh pig (27). Then, the second compressed air supply unit 500 supplies the compressed air into the launch pad 220 of the pig injection unit 200, so that the sixth pig 26, the seventh pig 27 and the fifth The two-washing fluid 31 is moved to one end of the pipe 10 to be cleaned.

As such, when the sixth pig 26 reaches one end of the pipe 10 to be cleaned, as shown in FIG. 18, the second open / close valve 430 of the first compressed air supply unit 400 is opened. By operating the first compressor 410, the generated compressed air is supplied to the connection line 900 through the first compressed air connecting pipe 420, and then to one end of the pipe 10 to be cleaned. The sixth and seventh pigs 26 and 27 and the second washing fluid 31 move from one end to the other end of the pipe 10 to be cleaned, and again the launch pad of the pig feeding part 200. 220 is located. As such, when the sixth and seventh pigs 26 and 27 and the second washing fluid 31 are positioned on the launching unit 220 of the pig feeder 200, the seventh pig 27 is more preferable. When the other end of the launch pad 220 is reached, the second washing fluid 31 is stored and moved to the second fluid storage unit 700. That is, as the fifth opening / closing valve 730 is opened, the second washing fluid 31 inside the launch pad 220 passes through the second fluid connecting pipe 720 to the second fluid storage tank 710. Are stored on the go.

When the inside of the washing target pipe 10 by the second washing fluid 31 is completed, the inside of the washing target pipe 10 by the third washing fluid 32 is washed. That is, after the pig 20 and the third washing fluid 32 are introduced into the launching unit 220 of the pig feeder 200, the second compressed air supply unit 500 and the first compressed air The cleaning operation is performed while the reciprocating movement of the pipe 10 to be cleaned by the supply unit 400. 19 to 22, first, as shown in FIG. 19, the eighth pig 28 is introduced into the launch pad 220 of the pig feeder 200, and the second compression as described above. The compressed air is supplied from the air supply unit 500 into the launch pad 220 of the pig input unit 200, and the eighth pig 28 is disposed within the pig input unit 200. Allow a certain distance to move in the direction. Thereafter, as shown in FIG. 20, the ninth pig 29 is introduced into the launch pad 220 of the pig feeder 200, and the compressed air is supplied from the second compressed air supply unit 500 as described above. The inside of the launch unit 220 of the input unit 200 is supplied to allow the ninth pig 29 to be moved a predetermined distance from the inside of the pig input unit 200 toward the washing target pipe 10. In this case, the ninth pig 29 moves to be spaced apart from the rear of the eighth pig 28 in the pig feeding part 200.

Thereafter, as shown in FIG. 21, in the washing fluid supply unit 300, the third washing fluid 32 is positioned between the eighth pig 28 and the ninth pig 29. Supply to the launch pad 220 of. That is, by opening the first opening and closing valve 330 connected to the washing fluid storage tank 310 in which the third washing fluid 32 is stored, the third washing fluid 32 is connected to the eighth pig 28. It is to be supplied to the launch pad 220 of the pig injection portion 200 to be located between the ninth pig 29. Then, the second compressed air supply unit 500 supplies the compressed air into the launch pad 220 of the pig injection unit 200, so that the eighth pig 28, the ninth pig 29 and the fifth Three washing fluid 32 is moved to one end of the pipe 10 to be washed.

As such, when the eighth pig 28 reaches one end of the pipe 10 to be cleaned, as shown in FIG. 22, the second open / close valve 430 of the first compressed air supply unit 400 is opened. By operating the first compressor 410, the generated compressed air is supplied to the connection line 900 through the first compressed air connecting pipe 420, and then to one end of the pipe 10 to be cleaned. The eighth, ninth pigs 28 and 29 and the third washing fluid 32 are supplied from one end to the other end of the pipe 10 to be cleaned, and again the launch pad of the pig feeding part 200 is supplied. 220 is located. As such, when the eighth and ninth pigs 28 and 29 and the third washing fluid 32 are positioned on the launching unit 220 of the pig injection unit 200, the ninth pig 29 is more preferable. When the other end of the launch pad 220 is reached, the third washing fluid 32 is moved to the second fluid storage unit 700 and stored. That is, as the fifth opening / closing valve 730 is opened, the third washing fluid 32 inside the launch pad 220 passes through the second fluid connecting pipe 720 to the second fluid storage tank 710. Are stored on the go.

When the washing of the pipe 10 to be cleaned by the third washing fluid 32 is completed, a step of removing residual fluid inside the pipe 10 to be cleaned is performed. That is, after the pig 20 is re-inserted into the pig feeder 200, the pig 20 is washed by the second compressed air supplier 500 and the first compressed air supplier 400. The pipe 10 and the pig input part 200 are allowed to reciprocate. Referring to FIGS. 23 and 24, the tenth pig 40 is introduced into the launch pad 220 of the pig feeder 200. Thereafter, the second compressor 510 is operated while the third open / close valve 530 of the second compressed air supply unit 500 is opened, so that the generated compressed air is a launch pad 220 of the pig input unit 200. ), The tenth pig 40 is moved from one end to the other end of the pipe 10 to be washed while pushing the fluid inside the pipe 10 to be cleaned to the connection line 900. Let it drain.

Thereafter, the first compressor 410 is operated while the second opening / closing valve 430 of the first compressed air supply unit 400 is opened, so that the generated compressed air is connected to the first compressed air connection pipe 420. After being supplied to the connection line 900 through, and supplied to one end of the washing target pipe 10, the tenth pig 40 is moved from one end of the washing target pipe 10 to the other end While pushing the fluid inside the washing target pipe 10 again, it is moved to the launch pad 220 of the pig injection unit 200.

When the discharge of the residual fluid in the washing target pipe 10 is completed, the inside of the washing target pipe 10 is dried and ventilated. Referring to FIG. 25, after the seventh open / close valve 920 of the gas discharge unit 800 is opened, dry air is supplied to the inside through the other end of the pipe 10 to be cleaned, and then the gas is discharged. The drying air is discharged to the outside while passing through the inside of the washing target pipe 10 by the unit 800. Referring to FIG. 24, the air dryer 840 generates a dry body in a heated state and supplies it to the inside through the other end of the pipe 10 to be cleaned, and the blower 810 of the gas discharge unit 800. By the suction force generated in the dry matter passes through the inside of the pipe 10 to be cleaned. Thereafter, the dry gas passing through the pipe 10 to be washed is discharged to the outside by the blower 810 while being guided by the marine connecting pipe 910 through the connecting line 900.

As such, the washing method using the subsea pipe cleaning apparatus according to an embodiment, by the reciprocating movement of the pig 20 by the first compressed air supply unit 400 and the second compressed air supply unit 500. After removing the fluid, the pig 20 and the washing fluid (30, 31, 32) is sequentially washed while reciprocating the inside of the pipe 10 to be washed, and then ventilated and dried by dry air In the state of being installed on the seabed, the long length of pipe can be easily washed.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

10: pipe to be cleaned 20: pig
100: buoyancy portion 200: pig injection portion
210: temporary piping 220: launch pad
230: pig sensor 300: cleaning fluid supply unit
310: washing fluid storage tank 320: washing fluid connector
330: first open and close valve 400: first compressed air supply unit
410: first compressor 420: first compressed air connector
430: second open and close valve 500: second compressed air supply unit
510: second compressor 520: second compressed air connector
530: the third open and close valve 600: the first fluid storage unit
610: first fluid reservoir 620: first fluid connector
630: fourth open and close valve 700: second fluid storage unit
710: second fluid reservoir 720: second fluid connector
730: fifth opening and closing valve 800: gas discharge portion
810: blower 820: exhaust gas connector
830: sixth opening and closing valve 840: air dryer

Claims

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In the state that one end is located on the sea floor, the other end in the washing method using a subsea pipe washing device for washing the pipe to be washed connected to the land,
The first compressed air supply unit and the gas discharge unit and the first fluid storage unit on the buoyancy floating on the sea is connected to one end of the pipe to be cleaned by a connecting line, and the other end of the pipe to be washed with the pig input connected Connecting and installing a washing fluid supply part, a second compressed air supply part, and a second fluid storage part to the pig input part;
After the pig is introduced into the pig input unit, the second compressed air supply unit and the first compressed air supply unit reciprocate the cleaning pipe and the pig injection unit by the second reciprocating movement of the fluid inside the cleaning target pipe while the first Discharging and removing the first fluid storage unit and the second fluid storage unit;
After the pig, the first washing fluid and the third washing fluid are put into the pig feeding portion, the first washing fluid reciprocates the pipe to be cleaned by the second compressed air supply part and the first compressed air supply part. Washing;
Injecting the pig and the second washing fluid into the pig feeding unit, and then washing the second washing fluid by reciprocating the cleaning target pipe by the second compressed air supply unit and the first compressed air supply unit;
Injecting the pig and the third washing fluid into the pig feeding part, and then washing the third washing fluid by reciprocating the washing target pipe by the second compressed air supply unit and the first compressed air supply unit;
After the pig is introduced into the pig input unit, the second compressed air supply unit and the first compressed air supply unit reciprocate the washing pipe and the pig injection unit by the second compressed air supply unit, and the remaining fluid inside the pipe to be cleaned Discharging and removing the first fluid storage unit and the second fluid storage unit; And,
After supplying dry air to the inside through the other end of the pipe to be cleaned, the dry air is discharged to the outside while passing through the inside of the pipe to be washed by the gas discharge, the drying and ventilation inside the pipe to be cleaned Washing method using a subsea pipe washing device comprising the step of.

The method according to claim 14,
The first washing fluid is a mixture of kerosene and cocosol, the second washing fluid is a fluid mixed with a degreasing agent in sea water, and the third washing fluid is an industrial water cleaning method using a subsea pipe cleaning device.

The method according to claim 14,
The pig feeder, and has a temporary pipe and the launch pad of the tubular shape is provided with a feed hole for the pig to feed,
Coupling the pig input unit to the other end of the pipe to be washed,
Connecting and coupling one end of the hypothesis pipe to the other end of the pipe to be cleaned;
Washing method using a subsea pipe cleaning device comprising the step of coupling the launch pad to the other end of the temporary pipe.

The method according to claim 14,
Discharging and removing the fluid inside the pipe to be washed to the first fluid storage unit and the second fluid storage unit,
Injecting a first pig into the pig feeder;
Supplying compressed air from the second compressed air supply unit to the pig input unit, and discharging the fluid inside the pipe to be cleaned to the connection line while moving the first pig to the other end of the pipe to be cleaned; Wow,
Moving the fluid discharged through the connection line to the first fluid storage part;
The compressed air supply unit supplies compressed air to the washing target pipe, and discharges the fluid inside the washing target pipe to the pig input part while moving the first pig from one end of the washing target pipe to the other end. Steps,
The fluid discharged to the pig injection unit is a cleaning method using a subsea pipe cleaning device comprising the step of moving to the second fluid storage.

The method according to claim 14 or 15,
Washing the first washing fluid while reciprocating the pipe to be washed,
Injecting a second pig into the pig feeder;
Supplying compressed air from the second compressed air supply unit to the pig feeding unit to move the second pig in the pig feeding unit in a predetermined distance in the direction of the pipe to be cleaned;
Injecting a third pig into the pig feeder;
Supplying compressed air from the second compressed air supply unit to the pig input unit to move the third pig in a direction of the pipe to be cleaned so as to be spaced apart from the second pig in the pig input unit; ,
Supplying the third washing fluid to the pig feeding part so that the third washing fluid is located between the second and third pigs in the washing fluid supplying part;
Supplying compressed air from the second compressed air supply unit to the pig input unit to move the second pig, the third pig and the third washing fluid to the pipe to be cleaned;
Injecting a fourth pig into the pig feeder;
Supplying compressed air from the second compressed air supply unit to the pig feeding unit to move the fourth pig in the pig feeding unit to be spaced apart from the third pig in a predetermined distance in the direction of the pipe to be cleaned; ,
Supplying the first washing fluid to the pig feeding part so that the first washing fluid is positioned between the third and fourth pigs in the washing fluid supplying part;
Supplying compressed air from the second compressed air supply unit to the pig feeding unit to move the fourth and first washing fluids in the direction of the pipe to be washed adjacent to the third pig;
Injecting a fifth pig into the pig feeder;
Supplying compressed air from the second compressed air supply unit to the pig input unit to move the fifth pig body a predetermined distance in the direction of the pipe to be cleaned so as to be spaced apart from the fourth pig in the pig input unit; ,
Supplying the first washing fluid to the pig feeding part so that the third washing fluid is located between the fourth and fifth pigs in the washing fluid supplying part;
Supplying compressed air from the second compressed air supply unit to the pig input unit, and moving the second to fifth pigs and the third and first washing fluids to one end of the pipe to be cleaned;
When the second pig reaches one end of the pipe to be cleaned, the third washing fluid is discharged and stored to the first fluid storage unit through the connection line by the compressed air applied from the second compressed air supply unit. Wow,
Supplying compressed air from the first compressed air supply unit to the pipe to be cleaned and moving the second to fifth and first washing fluids to the pig input unit;
And the first washing fluid is discharged and stored in the second fluid storage part when the fifth pig reaches the end of the pig feeding part.

The method according to claim 14 or 15,
Washing the second washing fluid while reciprocating the pipe to be washed,
Injecting a sixth pig into the pig feeder;
Supplying compressed air from the second compressed air supply unit to the pig feeding unit to move the sixth pig in the pig feeding unit a predetermined distance in the direction of the pipe to be cleaned;
Injecting a seventh pig into the pig feeding portion;
Supplying compressed air from the second compressed air supply unit to the pig input unit, and moving the seventh pig in the pig input unit to be spaced apart from the sixth pig in the pig input unit by a predetermined distance; ,
Supplying the second washing fluid to the pig feeding part so that the second washing fluid is located between the sixth and seventh pigs in the washing fluid supplying part;
Supplying compressed air from the second compressed air supply unit to the pig input unit to move the sixth pig, the seventh pig and the second washing fluid to one end of the pipe to be cleaned;
When the sixth pig reaches the end of the pipe to be cleaned, the first compressed air supply unit supplies compressed air to the pipe to be cleaned, thereby supplying the sixth pig, the seventh pig and the second washing fluid. Moving to the pig injection section;
And when the seventh pig reaches the end of the pig feeder, the second washing fluid is discharged and stored into the second fluid storage unit.

The method according to claim 14 or 15,
Washing the third washing fluid while reciprocating the pipe to be washed,
Injecting an eighth pig into the pig feeder;
Supplying compressed air from the second compressed air supply unit to the pig input unit to move the eighth pig in the pig input unit within a certain distance in the direction of the pipe to be cleaned;
Injecting a ninth pig into the pig feeding portion;
Supplying compressed air from the second compressed air supply unit to the pig feeding unit to move the ninth pig in the pig feeding unit at a predetermined distance in the direction of the pipe to be cleaned so as to be spaced apart from the eighth pig; ,
Supplying the third washing fluid to the pig feeding part so that the second washing fluid is positioned between the eighth and ninth pigs in the washing fluid supplying part;
Supplying compressed air from the second compressed air supply unit to the pig feeding unit to move the eighth pig, the ninth pig and the third washing fluid to one end of the pipe to be cleaned;
When the eighth pig reaches one end of the pipe to be cleaned, the first compressed air supply unit supplies compressed air to the pipe to be cleaned, thereby providing the eighth pig, the ninth pig, and the third washing fluid. Moving to the pig injection section;
And when the ninth pig reaches the end of the pig feeder, the third washing fluid is discharged and stored into the second fluid storage unit.

The method according to claim 14,
Discharging and removing the residual fluid in the washing target pipe to the first fluid storage unit and the second fluid storage unit,
Injecting a tenth pig into the pig feeding portion;
Supplying compressed air from the second compressed air supply unit to the pig input unit, and discharging the fluid inside the washing target pipe to the connection line while moving the tenth pig to the other end of the washing target pipe; Wow,
Moving the fluid discharged through the connection line to the first fluid storage part;
The compressed air supply unit supplies the compressed air to the pipe to be cleaned, and discharges the fluid inside the pipe to be cleaned to the pig input while moving the tenth pig to the other end of the pipe to be cleaned. Steps,
The fluid discharged to the pig injection unit is a cleaning method using a subsea pipe cleaning device comprising the step of moving to the second fluid storage.

The method according to claim 14,
The gas discharge unit is provided with a blower connected to the pipe to be cleaned in the state installed in the buoyancy, and an air dryer connected to the other end of the pipe to be cleaned in the state installed on the land,
Drying and ventilating the inside of the pipe to be cleaned includes:
Generating a dry body in the air dryer and supplying the inside of the pipe to be cleaned;
Generating a suction force in the blower, the washing method using a subsea pipe cleaning device comprising the step of sucking and discharging the gas inside the washing target pipe.