Water supply pipe internal cleaning system and pipe internal cleaning method using the same

Abstract

The present invention relates to a water supply pipe internal cleaning system and a water supply pipe internal cleaning method utilizing the system. The water supply pipe internal cleaning system of the present invention comprises: a shut-off valve installed in a supplier-side pipeline and a consumer-side pipeline, respectively; a supplier-side saddle fountain mounted on the outer circumference of the supplier-side pipeline and having one or more branch pipes formed therein; a pulsating flow generator that forcibly transfers supplied water to a high-pressure water discharge port using high-pressure air; a high-pressure water transfer hose, one end of which is connected to the branch pipe of the supplier-side saddle fountain and the other end of which is connected to the high-pressure water discharge port of the pulsating flow generator; a consumer-side saddle fountain mounted on the outer circumference of the consumer-side pipeline and having one or more branch pipes formed therein; and a sediment pipe, one end of which is connected to the branch pipe of the consumer-side saddle fountain and discharges sediment collected inside the water supply pipe together with water. Meanwhile, the cleaning method utilizing the water supply pipe internal cleaning system of the present invention comprises the step of closing all valves of the shut-off valves installed in the supplier-side pipeline and the consumer-side pipeline; The method comprises the steps of: installing a supplier-side saddle fountain and a consumer-side saddle fountain, respectively; connecting the pneumatic water discharge port of a pulsating flow generator to the branch pipe of the supplier-side saddle fountain using a high-pressure water transfer hose; connecting a drain pipe to the branch pipe of the consumer-side saddle fountain; opening a shut-off valve by opening the valve of the supplier-side pipeline; and operating the pulsating flow generator.

Description

Technology Field

[0001] The present invention relates to a water supply pipe internal cleaning system and a water supply pipe internal cleaning method utilizing the system. More specifically, the invention relates to a water supply pipe internal cleaning system and a water supply pipe internal cleaning method utilizing the system, which minimizes damage to the inner walls of the pipes during the cleaning process while enabling cleaning to be carried out entirely using water and air, which are environmentally friendly elements. Background Technology

[0002] While the internal cleaning methods for water supply pipes currently in use are gradually evolving, there are various underlying problems. Among these, issues such as oxidation or damage to the inner walls of water supply pipes and deterioration of water quality are particularly emerging.

[0003] Therefore, due to the aforementioned problems, methods have been proposed such as introducing a high-pressure Polly-Pig into the pipe to remove scale attached to the inner surface, or using a scraper to descale aging pipes.

[0004] First, regarding the prior art related to the cleaning method using a pig, if we examine the technical gist of the ‘method for cleaning a pipeline using a pig’ disclosed in Registered Patent No. 10-0847514, it is characterized by inserting a pig into the interior of the first ductile and sealing the flange, then installing a magnetic material on the other ductile to open and close the first and second shut-off valves installed in the water supply pipe, thereby cleaning the pipeline using internal water pressure.

[0005] In addition, regarding prior art related to a cleaning method using a scraper, the technical gist of the 'Aging Pipe Scaling Scraper and Aging Pipe Cleaning Method' disclosed in Registered Patent No. 10-1323158 is characterized by providing a scraper that enables fast and accurate cleaning by providing a rotary cut configured to have a plurality of blades configured to be in close contact with the inner surface of the aging pipe and configured to rotate the plurality of blades around a rotating shaft positioned at the center of the cross-section of the aging pipe, and a sealed motor configured to provide power to the rotating shaft and a housing configured to surround the motor.

[0006] However, among the conventional water supply pipe cleaning methods described above, the cleaning method using a pig was extremely limited in its scope of application because it could only clean water pipes located at a fixed distance, and there was a very high possibility that the compressed air and increased water pressure used to advance the pig would cause strong vibrations or shocks inside the pipes.

[0007] Furthermore, among conventional water supply pipe cleaning methods, the scraper cleaning method, like the aforementioned pig cleaning method, could only clean water pipes located at a fixed distance. In addition, not only did it require the long experience and technical skills of experienced workers to precisely adjust the scraper, but it also had potential problems, such as severe damage to the inner walls of the water pipes if the adjustment process deviated from the allowable error range. Prior art literature

[0008] Korean Registered Patent Publication No. 10-0847614 (Device and method for cleaning the internal conduit of a water supply pipe, published July 21, 2008) Korean Registered Patent Publication No. 10-1323158 (Scaling scraper for aging pipes and method for cleaning aging pipes, published October 30, 2013) Korean Registered Patent Publication No. 10-2062809 (Pipe cleaning device and method for cleaning pipes using the same, published January 6, 2020) The problem to be solved

[0009] The present invention was conceived for the purpose of improving the conventional problems described in the background technology above. The objective of the present invention is to provide a water supply pipe internal cleaning system and a water supply pipe internal cleaning method utilizing this system, which minimizes damage to the inner walls of pipes and the like during the cleaning process, while enabling cleaning to be carried out entirely using water and air, which are environmentally friendly elements.

[0010] In addition to the clear problems described above, the present invention may aim to achieve other problems that can be easily derived by a person skilled in the art from the overall description in this specification. means of solving the problem

[0011] A water supply pipe internal cleaning system according to a first embodiment of the present invention for achieving the above-mentioned problem comprises: a shut-off valve (110, 120) installed in the supplier-side pipe and the consumer-side pipe of the water supply pipe (10); a supplier-side saddle fountain (130) mounted on the outer circumference of the supplier-side pipe and having at least one branch pipe formed therein for coupling with the following high-pressure water transfer hose; a pulsating flow generator (140) that forcibly transfers water supplied through a water inlet (141a) to a high-pressure water discharge port (141c) formed on the other side of the water inlet (141a) using high-pressure air; and a high-pressure water transfer hose (150) having one end connected to the branch pipe of the supplier-side saddle fountain (130) and the other end connected to the high-pressure water discharge port (141c) of the pulsating flow generator (140). It is configured to include: a saddle-type water pipe (160) mounted on the outer circumference of the resident-type pipe and having at least one branch pipe formed therein for connecting to the effluent pipe below; and an effluent pipe (170) having one end connected to the branch pipe of the resident-type water pipe (160) to discharge various sediments collected inside the water supply pipe (10) into a river along with water.

[0012] According to a water pipe internal cleaning system according to a second embodiment of the present invention for achieving the above-mentioned problem, the pulsation flow generating device (140) comprises: a housing (141) having a water inlet (141a) and an air inlet (141b) formed on one side, respectively, and a high-pressure water discharge port (141c) formed on the other side; a pneumatic water generating member (142) mounted inside the housing (141), with its front end connected to the water inlet (141a) and its rear end connected to the high-pressure water discharge port (141c); a water supply pump (143) installed on the outer surface of the front end of the pneumatic water generating member (142) to pump water provided from the water inlet (141a) so as to be forcibly transferred to the other side; and a central outer surface located between the front end and the rear end of the pneumatic water generating member (142), with one side being the air It includes an air supply pump (144) that is connected to the injection port (141b) via a pipe and, on the other side, is connected to the outer surface of the rear end of the pneumatic water generating member (142) via a pipe.

[0013] According to the third embodiment of the present invention for achieving the above-mentioned problem, the water supply pipe internal cleaning system comprises: a water quality sensor module installed on the inner circumference of the consumer-side pipe of the water supply pipe (10) to collect water quality data of water transferred from the supplier-side pipe, and quantifying the collected various water quality data into binary numbers and transmitting them to a control module in the form of a signal; and a control module that, when the signal value received from the water quality sensor module is less than a preset value, opens the valve of the consumer-side pipe to open the shut-off valve (120), and when the signal value received from the water quality sensor module exceeds the preset value, closes the valve of the consumer-side pipe to close the shut-off valve (120) and simultaneously generates a control command signal to operate the pulsation flow generating device (140).

[0014] In the context of the third embodiment above, the water quality data may be one or more selected from color, turbidity, pH concentration, iron (Fe) concentration, lead (Pb) concentration, copper (Cu) concentration, and zinc (Zn) concentration.

[0015] Meanwhile, a method for cleaning the inside of a water pipe using a water pipe internal cleaning system according to the first embodiment of the present invention for achieving the above-mentioned problem comprises: a step of closing all valves of the shut-off valves (110, 120) installed in the supplier-side pipeline and the consumer-side pipeline of the water pipe (10); a step of installing a supplier-side saddle fountain (130) and a consumer-side saddle fountain (160) respectively on the outer circumference of the supplier-side pipeline and the outer circumference of the consumer-side pipeline; a step of connecting the pneumatic water discharge port (141c) of the pulsation flow generating device (140) to the branch pipe of the supplier-side saddle fountain (130) using a high-pressure water transfer hose (150); a step of connecting an effluent pipe (170) to the branch pipe of the consumer-side saddle fountain (160); and a step of opening the shut-off valve (110) by opening the valve of the supplier-side pipeline. and the step of operating the above-mentioned pulsation generating device (140); is performed.

[0016] According to the water supply pipe internal cleaning method utilizing the water supply pipe internal cleaning system according to the second embodiment of the present invention for achieving the above-mentioned problem, the step of additionally installing a water quality sensor module that communicates via wired or wireless communication with a manager terminal and a control module on the inner circumference of the conduit on the consumer side may be further included.

[0017] In the context of the second embodiment above, the control module operates to open the valve of the consumer-side pipeline so that the shut-off valve (120) is opened when the signal value received from the water quality sensor module is less than the preset value, and generates a control command signal to close the valve of the consumer-side pipeline so that the shut-off valve (120) is closed and the pulsating flow generating device (140) is operated at the same time when the signal value received from the water quality sensor module exceeds the preset value.

[0018] Meanwhile, according to the water supply pipe internal cleaning method utilizing the water supply pipe internal cleaning system according to the third embodiment of the present invention for achieving the above-mentioned problem, the step of operating the pulsation flow generating device (140) may include a step in which an administrator directly inserts an endoscope camera into the water supply pipe (10) to observe and diagnose the condition inside the water supply pipe (10).

[0019] Specific details of other embodiments are included in specific details for implementing the invention, etc. Effects of the invention

[0020] According to the water supply pipe internal cleaning system of the present invention and the water supply pipe internal cleaning method utilizing this system, damage to the inner walls of the pipes is minimized during the process of cleaning the inside of the pipes, while cleaning is carried out using only water and air, which are environmentally friendly elements, throughout the entire cleaning process, thereby having the effect of significantly contributing to the carbon neutrality policy being promoted by the government.

[0021] The effects of the present invention are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art from the description in the claims. Brief explanation of the drawing

[0022] FIG. 1 is a schematic diagram showing the configuration of a water supply pipe internal cleaning system according to an embodiment of the present invention. FIG. 2 is an operating state diagram of a water supply pipe internal cleaning system according to an embodiment of the present invention, FIG. 3 is a perspective view showing the pulsation flow generating device of FIG. 1. FIG. 4 is a flowchart for a water supply pipe internal cleaning system according to an embodiment of the present invention, FIG. 5 is a block diagram showing the sequence of a water pipe internal cleaning method using a water pipe internal cleaning system according to an embodiment of the present invention. Specific details for implementing the invention

[0023] Hereinafter, an internal cleaning system for water pipes according to an embodiment of the present invention will be described in detail with reference to the attached drawings.

[0024] For reference, the attached drawings are merely reference drawings for explaining the configuration of the present invention, and it is understood that the size or shape, etc., may be changed depending on the installation location and environment, etc., without departing from the essence of the present invention. Furthermore, the terms used in this specification are for describing the embodiments and are not intended to limit the present invention.

[0025] FIG. 1 is a schematic diagram showing the configuration of a water supply pipe internal cleaning system according to an embodiment of the present invention.

[0026] Referring to FIG. 1, the internal cleaning system of a water supply pipe according to the present invention comprises a shut-off valve (110, 120), a supplier-side saddle fountain (130), a pulsating flow generator (140), a high-pressure water transfer hose (150), a consumer-side saddle fountain (160), and an effluent pipe (170).

[0027] The above-mentioned water valves (110, 120) are installed in the supplier-side pipeline and the consumer-side pipeline of the water supply pipe (10), respectively, and function to control the inflow or outflow of water into the water supply pipe (10) according to the opening or closing operation of the valves. At this time, the opening or closing operation of the valves may be configured so that a worker can operate them directly, or a separate control module may be provided so that they can be operated automatically under the control of the control module.

[0028] Additionally, the supplier-side saddle fountain (130) is mounted on the outer periphery of the supplier-side pipeline, and at least one branch pipe is formed to be combined with the high-pressure water transfer hose (150) to be described later.

[0029] Meanwhile, the above-mentioned pulsation flow generating device (140) functions to forcibly transfer water supplied through the water inlet (141a) to the high-pressure water discharge port (141c) formed on the other side (opposite direction) of the water inlet (141a) using high-pressure air.

[0030] FIG. 3 is a perspective view showing the pulsation flow generating device (140) of FIG. 1. Referring to FIG. 3, the pulsation flow generating device (140) will be described in detail. First, the pulsation flow generating device (140) may be configured to include a housing (141), a pneumatic water generating member (142), a water supply pump (143), and an air supply pump (144).

[0031] The housing (141) constituting the above-mentioned pulsation flow generating device (140) has a water inlet (141a) and an air inlet (141b) formed on one side, respectively, and a high-pressure water discharge port (141c) formed on the other side.

[0032] At this time, although not shown in the drawing, the water inlet (141a) is configured to be connected to a separate water supply means, etc., for receiving external water so as to be provided with external water.

[0033] The pneumatic water generating member (142) constituting the above-mentioned pulsating flow generating device (140) is mounted inside the housing (141), and as shown in FIG. 3, the front end is connected to the water inlet (141a) and the rear end is connected to the high-pressure water discharge port (141c).

[0034] The water supply pump (143) constituting the above-mentioned pulsation flow generating device (140) is installed on the outer surface of the front end of the pneumatic water generating member (142) and operates to pump so that water provided from the water inlet (141a) is forcibly transferred to the other side.

[0035] The air supply pump (144) constituting the above-mentioned pulsation flow generating device (140) is installed on the outer surface of the central portion located between the front and rear portions of the pneumatic water generating member (142), and is connected to the air inlet (141b) via a pipe, and the other side is connected to the outer surface of the rear portion of the pneumatic water generating member (142) via a pipe.

[0036] At this time, it is preferable that the air supply pump (144) be configured as an air compressor that inhales air from the atmosphere and compresses it to a certain pressure or higher to produce compressed air, thereby producing compressed air and supplying it to the high-pressure water discharge port (141c).

[0037] As a variation of the above pulsation flow generating device (140), a filter section may be provided at the location where high-pressure water is discharged.

[0038] It is preferable that the filter unit comprises a pre-filter that primarily filters relatively large particles contained in compressed air and water compressed at high pressure, and a HEPA filter that secondarily filters fine particles of compressed air and water that have passed through the pre-filter.

[0039] In addition, the pulsation flow generating device (140) of the present invention may further be equipped with a pressure regulating means for automatically regulating internal pressure in order to automatically regulate the discharge pressure of high-pressure water.

[0040] The above pressure regulating means may be configured to include one or more selected from a safety valve, a pressure reducing valve, a pressure regulating valve, and a venting valve, and as the function or operation of each valve is well known, a detailed description thereof is omitted.

[0041] Meanwhile, one end of the high-pressure water transfer hose (150) is connected to the branch pipe of the supplier-side saddle fountain (130), and the other end is connected to the high-pressure water discharge port (141c) of the pulsation flow generator (140).

[0042] In addition, the above-mentioned saddle-shaped fountain (160) on the consumer side is mounted on the outer periphery of the consumer side pipe, and at least one branch pipe is formed to be combined with the saddle pipe (170) to be described later.

[0043] Finally, the above-mentioned slate pipe (170) is connected at one end to the branch pipe of the saddle fountain (160) on the consumer side to discharge various sediments collected inside the above-mentioned water pipe (10) along with water into a river or the like.

[0044] As shown in FIG. 2, the water supply pipe internal cleaning system according to the present invention, which is composed of the above-described configurations, when the pulsating flow generating device (140) is activated when the water shut-off valve (120) on the consumer side is in a closed state, the pulsating flow generating device (140) generates high-pressure water, and the generated high-pressure water passes through the branch pipe of the saddle fountain (130) on the supplier side via the high-pressure water transfer hose (150) and enters the interior of the water supply pipe (10).

[0045] As described above, the high-pressure water that enters the interior of the water supply pipe (10) collects sediment and other materials inside the pipe (10) during the process of being forcibly transported toward the consumer side. The collected sediment and other materials are then discharged into the sewage, etc., along with the water through the effluent pipe (170) connected to the branch pipe of the consumer-side saddle fountain (160).

[0046] In addition, the present invention may further include a water quality sensor module installed on the inner circumference of the consumer-side pipeline of the water supply pipe (10) to collect water quality data of water transferred from the supplier-side pipeline, quantify the collected various water quality data into binary numbers, and transmit the data as a signal to a control module; and a control module that, when the signal value received from the water quality sensor module is less than a preset value, opens the valve of the consumer-side pipeline to open the shut-off valve (120), and when the signal value received from the water quality sensor module exceeds the preset value, closes the valve of the consumer-side pipeline to close the shut-off valve (120) and simultaneously generates a control command signal to operate the pulsation flow generating device (140).

[0047] At this time, the above water quality data may be one or more selected from color, turbidity, pH concentration, iron (Fe) concentration, lead (Pb) concentration, copper (Cu) concentration, and zinc (Zn) concentration, which are items corresponding to water quality items.

[0048] Hereinafter, a method for cleaning the inside of a water pipe using a water pipe internal cleaning system according to an embodiment of the present invention will be described in detail.

[0049] FIG. 5 is a block diagram showing the sequence of a water pipe internal cleaning method using a water pipe internal cleaning system according to an embodiment of the present invention.

[0050] Referring to FIG. 5, the water supply pipe internal cleaning method using the water supply pipe internal cleaning system according to the present invention comprises the steps of: closing all valves of the shut-off valves (110, 120) installed in the supplier-side pipe and the consumer-side pipe of the water supply pipe (10); installing the supplier-side saddle fountain (130) and the consumer-side saddle fountain (160) respectively on the outer circumference of the supplier-side pipe and the outer circumference of the consumer-side pipe; connecting the pneumatic water discharge port (141c) of the pulsation flow generating device (140) to the branch pipe of the supplier-side saddle fountain (130) using a high-pressure water transfer hose (150); connecting the drain pipe (170) to the branch pipe of the consumer-side saddle fountain (160); opening the valve of the supplier-side pipe to open the shut-off valve (110); and operating the pulsation flow generating device (140).

[0051] According to an embodiment of the present invention, the step of additionally installing a water quality sensor module that communicates wired or wirelessly with a manager terminal and a control module on the inner circumference of the conduit on the consumer side may be further included.

[0052] Meanwhile, FIG. 4 is a flowchart for a water supply pipe internal cleaning system according to an embodiment of the present invention.

[0053] Referring to FIG. 4, the control module can be configured to operate by opening the valve of the consumer-side pipeline to open the shut-off valve (120) when the signal value received from the water quality sensor module is less than a preset value, and to generate a control command signal to close the valve of the consumer-side pipeline to close the shut-off valve (120) and simultaneously operate the pulsation flow generating device (140) when the signal value received from the water quality sensor module exceeds the preset value.

[0054] According to an embodiment of the present invention, in order to visually determine the internal condition of the water supply pipe (10), an endoscope camera (not shown in the drawing) capable of wired or wireless communication with a manager terminal can be directly inserted into the water supply pipe (10). By directly inserting the endoscope camera into the water supply pipe (10) in this manner, the internal condition of the water supply pipe (10) can be observed and diagnosed more precisely through the manager terminal that communicates via wired or wireless communication.

[0055] That is, before cleaning foreign substances such as corrosion, scale, and sludge that may occur inside the water supply pipe (10), the manager can observe and inspect the condition inside the water supply pipe (10) to set the rotational speed and discharge pressure of the water supply pump (143) and air supply pump (144) of the pulsation flow generating device (140) to conditions that match the condition inside the water supply pipe (10), and as a result, the overall operation of the system can be operated efficiently.

[0056] As described above, when inspecting or diagnosing the internal condition of a water supply pipe (10) using an endoscope camera, the endoscope camera may be connected to a terminal equipped with a display via a wired or wireless communication method, and may include a separate communication module for this purpose.

[0057] Although embodiments of the water supply pipe internal cleaning system and the water supply pipe internal cleaning method utilizing the system according to the present invention have been described above, this is merely an illustrative description of preferred embodiments of the present invention and does not limit the invention. Furthermore, it is obvious to those skilled in the art that various modifications and imitations are possible within the scope of the technical spirit of the present invention without departing from it. Explanation of the symbols

[0058] 10 : Water supply pipes 110, 120 : Shut-off valves 130: Supplier-side saddle fountain 140: Pulsating flow generator 141: Housing 141a: Water inlet 141b: Air inlet 141c: High-pressure water outlet 142: Pneumatic water generating component 143: Water supply pump 144 : Air supply pump 150 : High-pressure water transfer hose 160: Consumer-side Saedeul Fountain 170: Ito-kan

Claims

Claim 1 Water shut-off valves (110, 120) installed in the supplier-side pipeline and the consumer-side pipeline of the water supply pipeline (10); a supplier-side saddle fountain (130) mounted on the outer circumference of the supplier-side pipeline and having at least one branch pipe formed therein for connection with the high-pressure water transfer hose below; a pulsating flow generator (140) that forcibly transfers water supplied through a water inlet (141a) to a high-pressure water discharge port (141c) formed on the other side of the water inlet (141a) using high-pressure air; a high-pressure water transfer hose (150) with one end connected to the branch pipe of the supplier-side saddle fountain (130) and the other end connected to the high-pressure water discharge port (141c) of the pulsating flow generator (140); and a consumer-side saddle fountain (160) mounted on the outer circumference of the consumer-side pipeline and having at least one branch pipe formed therein for connection with the saddle pipe below. and a sludge pipe (170) having one end connected to a branch pipe of the saddle fountain (160) on the consumer side to discharge various sediments collected inside the water supply pipe (10) into a river together with water; and the pulsation flow generating device (140) comprises: a housing (141) having a water inlet (141a) and an air inlet (141b) formed on one side respectively, and a high-pressure water discharge port (141c) formed on the other side; a pneumatic water generating member (142) mounted inside the housing (141), with its front end connected to the water inlet (141a) and its rear end connected to the high-pressure water discharge port (141c); a water supply pump (143) installed on the outer surface of the front end of the pneumatic water generating member (142) to pump water provided from the water inlet (141a) so as to be forcibly transported to the other side; and the An air supply pump (144) installed on the outer surface of the central portion located between the front and rear portions of the pneumatic water generating member (142), with one side connected to the air inlet (141b) via piping and the other side connected to the outer surface of the rear portion of the pneumatic water generating member (142) via piping;The apparatus further comprises: a water quality sensor module installed on the inner circumference of the consumer-side pipeline of the water supply pipe (10) to collect water quality data of water transported from the supplier-side pipeline, quantify the collected various water quality data into binary numbers, and transmit this as a signal to a control module; and a control module that, when the signal value received from the water quality sensor module is less than a preset value, opens the valve of the consumer-side pipeline to open the shut-off valve (120), and when the signal value received from the water quality sensor module exceeds the preset value, closes the valve of the consumer-side pipeline to close the shut-off valve (120) and simultaneously generates a control command signal to operate the pulsation flow generator (140); wherein the pulsation flow generator (140) is provided with a filter unit at a location where high-pressure water is discharged, and the filter unit includes a pre-filter that primarily filters compressed air compressed to high pressure and relatively large particles contained in water, and a filter that passes through the pre-filter The pulsation flow generator (140) is composed of a HEPA filter that secondarily filters fine particles of compressed air and water, and the pulsation flow generator (140) is further equipped with a pressure regulating means that automatically regulates internal pressure to automatically regulate the discharge pressure of high-pressure water, and the pressure regulating means includes one or more selected from a safety valve, a pressure reducing valve, a pressure regulating valve, and a venting valve, and in order to visually determine the internal condition of the water supply pipe (10), an endoscope camera capable of wired or wireless communication with a manager terminal is inserted into the water supply pipe (10) to observe and inspect the internal condition of the water supply pipe (10), and the rotational speed and discharge pressure of the water supply pump (143) and air supply pump (144) of the pulsation flow generator (140) are set to conditions that correspond to the internal condition of the water supply pipe (10), and the endoscope camera can be connected to a terminal equipped with a display via a wired or wireless communication method and includes a communication module for this purpose, characterized by cleaning the inside of the water supply pipe. System.; Claim 2 delete Claim 3 delete Claim 4 A water supply pipe internal cleaning system according to claim 1, characterized in that the water quality data is one or more selected from color, turbidity, pH concentration, iron (Fe) concentration, lead (Pb) concentration, copper (Cu) concentration, and zinc (Zn) concentration. Claim 5 A method for cleaning the internal structure of a water supply pipe using the internal cleaning system of the first claim. Claim 6 delete Claim 7 delete Claim 8 delete

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