KR20090115561A - Chemical Cleaning Method in Water Distribution Pipes - Google Patents

Abstract

PURPOSE: A chemistry rinse method of a drainpipe is provided to remove the residual scales and incrustation and to prevent rust stain of tap water. CONSTITUTION: Blocking cocks(21,22) are installed in a drainpipe(1). Saddles(3,4) are mounted on back and forth of the blocking cocks. A float(51) hanged on a pulling string(5) is inserted into one side of the saddle. A first traction line sends the float to an outlet saddle with water. A second traction line is connected to the first traction line when the first traction line reaches the outlet saddle. An absorbing tube is pulled with the second traction line to reach the outlet saddle and pulled to an inlet saddle by discharging the residual water. The residual is drained out by a weight of the end part of the absorbing tube. The detergent is sprinkled into the drainpipe inner wall.

Description

 Chemical Cleaning Method in Water Distribution Pipes

The present invention relates to a chemical cleaning method of a drain pipe, and the chemical cleaning agent of an eco-friendly material is injected into the drain pipe through a nozzle and reacted for 10 to 120 minutes depending on the scale, deposition foreign matter, scale and the like inside the drain pipe and neutralizing agent. The present invention relates to a method for cleaning a drain pipe, which neutralizes the cleaning agent sprayed and injected into the drain pipe, and finally washes the water.

The water supply pipe is a water pipe for the transfer of raw water from the raw water to the water purification plant, a water pipe for transferring the purified tap water from the water purification plant to the sump, a drain pipe for transferring the tap water from the reservoir to the home meter, a water supply pipe for transferring the tap water from the tap to the faucet, and It is classified as indoor water supply pipe.

Recently, the interest in the washing of water supply pipes is rapidly increasing to ensure the safety of tap water. In the case of water pipes and water pipes, which are large pipes, the washing of the water supply pipes is very difficult. The cleaning of indoor water supply pipes was carried out in accordance with the revised water law on December 30, 2006. According to this, water quality test results showed turbidity (less than 1 NTU), hydrogen ion concentration (5.8 to 8.5), and chromaticity (5 degrees) in multi-use facilities of a certain size or more. Water supply pipe should be washed when the inspection standard for iron or less (0.3 mg / L or less) is exceeded, and the owner, etc., reports the result to the general water supply company when measures such as washing, rehabilitation and replacement are performed. Various techniques have been provided regarding the cleaning of indoor water supply pipes. That is, as a method for washing indoor water supply pipes, a number of technologies include 'Pipe cleaning method using ozone water and air bubbles (Patent No. 00408383)' and 'Chemical cleaning method for indoor water supply pipes' (Patent Application No. 10-2007-0107677). It has been provided.

However, there is a limit to the safe supply of tap water by washing only the indoor water supply pipe, and a more thorough cleaning method of the drainage pipe before the indoor water supply pipe must be devised. The washing method of the drain pipe has been largely used, such as a flushing method, a poly pig method, a scraper method. However, in Korea, the flushing method has been used locally for multi-community areas within the drainage area, which is a simple solution to temporarily solve the occurrence of rust. The polypig method and the scraper method remove the scale of the hard iron oxide inside the cast iron pipe and then premise the lining, which is excessively disadvantageous to be performed by the simple cleaning method inside the drain pipe.

 More specifically, flushing is a method that has been generally used in advanced countries by draining and washing stagnant water in water pipes by opening a hydrant valve. First, the conventional drainage washing method, in which one or more fire hydrants are opened and cleaned by the hydraulic force of the fluid flowing in the drain pipe, and second, the one-way drainage washing method, which separates a specific section into a water pipe. It is a method of washing at a sufficient flow rate by allowing water to flow in one direction. In other words, by closing the valve of a specific pipeline section and opening the fire hydrant of the section to be washed sequentially, it takes about 2 ~ 3 days to be washed sequentially from the water purification plant to the entire distribution system. Third, there is a continuous drainage washing method, which is a method of flowing low-flow water in a small area of the distribution system in a region with a large number of end areas or severe water circulation problems. It must be discharged continuously to prevent the stagnation of water and the concentration of disinfectant should be maintained at an appropriate level. In conclusion, because the drainage washing method is a method of washing by hydraulic force due to the flow rate of water in the drainage pipe, there is a limit to maximize the washing effect. In connection with such drainage washing method of 'washing water pipes (Patent Application No. 10-2007-0047063)' has been provided. This is done by inserting aggregates with a specific gravity less than 1 in the ground and underground fire hydrants on the water supply line and injecting air using an air compressor to mix the tap water and the aggregates in the pipeline and generate turbulence, which leads to deposits and deposits on the inner wall of the pipeline. It is a drainage washing method of water pipes, which removes substances, biofilm on the surface of the tube, and the injected aggregate has a specific gravity less than 1 so that it is completely discharged by final water washing and does not settle inside the tube. It is difficult to remove the scale or water inside the drainage pipe, but it is difficult to expect a complete cleaning effect.

The method of washing the drain pipe by poly pig is already commercialized in Korea and advanced foreign countries, and as a domestic patent, the 'complex washing method of water pipe furnace' (Patent Application No. 10-2007-0032373) using poly pig is known. This is a complex washing method for regular maintenance of water pipes, which includes water pipe investigation and recording, cleaning preparation, excavation, pipe cutting and removal, pig plunger and receiver installation, poly pig installation, primary poly Pigment washing step, acid washing agent input step and second poly pig cleaning step for corrosion softening of the inner wall scale, corrosion inhibitor and chlorine input step, characterized in that consisting of the washing water treatment step. This method uses all possible methods for cleaning pipes and the procedure is very complicated and the detailed method of each step is ambiguous, so there are many limitations in actual application. The other scraper method is used to remove the hard scale by inserting the scraper into the drain pipe in a conventional manner, which is difficult to implement, which is not suitable for the perfect cleaning of scales, scales and the like.

Therefore, at the present time when people's expectations for tap water are rising, it is urgently needed to develop a drain pipe cleaning method that can be easily applied to remove scales, deposits, and scales remaining inside the drain pipe.

The present invention is a chemical cleaning method for removing the scale, deposition foreign matters, scales, etc. generated in the interior due to the corrosion of the drain pipe by putting a chemical cleaner of the environmentally friendly material in the drain pipe, it can pull the nozzle for spraying the chemical cleaner Method, the method of discharging remaining tap water inside the pipe for cleaning, proper nozzle spraying of chemical cleaner, neutralizing acid condition by spraying detergent inside the pipe, etc.

The effect that can be obtained through the present invention is to remove foreign substances and scales in the drain pipe and to remove the scales strongly adhered to it is possible to eliminate the distrust of tap water by removing the rust and odor of tap water.

The present invention relates to a chemical cleaning method that allows the removal of scale, deposited substances and scales generated in the pipe due to corrosion by putting a chemical cleaning agent of an environmentally friendly material in the drain pipe, Process is a factor.

 1. Blocking cock and saddle installation steps

The present invention, as shown in the accompanying drawings, Figure 1, to install the blocking cock (21, 22; cock) on the basis of the length that can be washed in the long drain pipe 1, the cock (21, 22) The process of installing the saddles 3 and 4 after the transfer is the first element.

As shown above, the cocks 21 and 22 and the saddles 3 and 4, which are to be installed at certain lengths, are not provided in the water supply drainage pipes, so that the water supply drainage pipes are not easy to clean. Accordingly, the present invention provides a first element by dividing the drain pipe into washable unit lengths and providing blocking cocks 21 and 22 for each unit distance, and providing saddles 3 and 4 on both sides thereof.

The washable length should be such a distance that a washing hose to be described later can be put in and taken out. Therefore, as for the distance of the cocks 21 and 22, the maximum distance in the range which a hose pulled can bear is preferable. This distance may increase the installation distance when the drainage pipe is installed in a straight state, that is, on a flat surface, but the installation distance should be made as short as possible in a curved or inclined place.

2. Towing Line Installation Steps

The present invention includes a drawbar installation step in the area to be cleaned, and in the present invention provides a special technique for the drawstring installation process. That is, in installing the tow line in the tube, it is common to install the tow line by forcibly pushing a large strength wire through one side of the tube and pulling it out to the other side. Very difficult, in the present invention, as shown in Figure 1 of the accompanying drawings, the first primary slender line (such as a fishing line connected to the trellis through the one (mouth) side saddle 3 of the drain pipe 1) 5) Insert the hanging ball 51 and open the mouth cock 21 to direct the water to the open birds 4 on the other (out) side so that the flowing water attracts the ball 51 to the exit birds 4. The second characteristic element is to provide a process for installing the primary tow line 5. The tow line lubrication for supplying the primary tow line 5 should be provided with a packed stopper perforated enough to pass only the primary tow line 5. When the primary tow line 5 reaches the exit saddle 4, the secondary tow line 6, which is stronger, is connected to the primary tow line 5 and drawn out to the entry saddle 3, thereby removing the second car. It is possible to connect the washing hose to be described later to the tow line (6).

3. Drainage stage of residual water in drain pipe

In order to clean the drain pipe, it is necessary to drain the residual water in the drain pipe. Thus, the present invention includes a process for evacuating the residual water in the drain pipe, and the present invention provides a special process that allows the drain pipe to be discharged to the residual water at the bottom of the drain pipe even though the drain pipe is bent and inclined in various places. To provide.

That is, according to the present invention, as shown in FIG. 2, the weight 71 is installed at the end of the absorption pipe 7 connected to the suction pump, and the absorption pipe 7 is connected to the secondary traction line 6. After pulling to reach the exit saddle (4), the suction tube (7) is pulled toward the entrance saddle (3) while suctioning and discharging residual water by the suction pump, the end of the absorption tube (7) is drained by the weight (71) Provide a process of allowing suction to bottom water of (1).

4. Spraying step of drain pipe of eco-friendly chemical cleaner

The present invention includes spraying an environmentally friendly chemical cleaner in the drain pipe, and washing the scale, the scale and other foreign matter deposited in the drain pipe. Such a cleaning agent is preferably Patent No. 10-0808373 “Cleaning composition for indoor water supply pipe cleaning” provided by the present inventors.

In spraying the cleaner into the drain pipe, as shown in FIG. 3, the cleaning hose 8 provided with the cleaning nozzle 81 is connected to the second tow line 6, and the cleaning hose 8 is connected. Pull towards the exit saddle 4 and evenly spread the cleaning agent from the exit saddle 4 side to the entrance saddle 3. The cleaning agent is preferably sprayed at a pressure of 20 to 80 bar.

It is preferable to allow the cleaning agent to react for about 10 to 120 minutes depending on the degree of contamination inside the drain pipe so that the detergent can sufficiently react with scale, scale or sediment foreign matter in the drain pipe.

5. Neutralization and first water washing step in the drain pipe

After the application of the cleaning agent and the time required for the reaction of the cleaning agent to elapse, it may be necessary to neutralize the cleaning agent in the drain pipe and discharge the remaining treated water. If the detergent is a neutral detergent, a neutralization process may not be necessary. However, in order to obtain a descaling effect in the drain pipe, the use of an acidic cleaner is essential, so that the neutralization process is necessary.

In the neutralization process, as shown in FIG. 4, the cleaning nozzle 81 is moved while winding the second tow line 6 with a towing winch, and the above-described patent 10-0808373 “for washing indoor water supply pipes. Detergent composition ”, for example, a reciprocating spray of a neutralizing agent diluted with NaCl to about 15 to 25% of tap water is reciprocated several times in a drain pipe, and after 10 to 20 minutes, a high pressure primary water is used at a pressure of 100 to 200 bar through a washing nozzle. Repeat the wash several times.

6. Final water washing and wastewater treatment steps

Final water washing and wastewater treatment process, as shown in the accompanying drawings, Figure 5, to mount the cap 31 in the saddle of the drain pipe inlet to close the inlet, and is connected to the wastewater treatment device in the saddle of the drain pipe end. Open the valve at the inlet to perform the final water washing, measure the pH of the wastewater from the wastewater treatment system, and drain the wastewater at the same time as the water wash and discharge the sewage pipe until it meets the pH 5.8 ~ 8.5.

7. Final corner stage

After completing the second water wash, both saddles 3 and 4 are closed and both cocks 21 and 22 are opened for final watering.

1 is an explanatory view showing a step of preparing a wash by installing a blocking cock and saddle according to the present invention;

2 is an explanatory diagram showing the step of draining residual water in a drain pipe according to the present invention;

Figure 3 is an explanatory view showing the step of spraying in the drain pipe of the environmentally friendly material chemical cleaner according to the present invention

Figure 4 is an explanatory diagram showing the neutralization treatment and the first water washing step in the drain pipe according to the present invention

5 is an explanatory view showing the final water washing and wastewater treatment step according to the present invention

<Explanation of symbols for the main parts of the drawings>

  1.drain pipe

   21, 22. Blocking Cock

  3, 4. Saddle

   31. Saddle Cap

  5. Primary towing line

   51.

  6. Second tow line

  7. Absorption tube

   71.

  8. Cleaning Hose

   81. Cleaning nozzle

Claims (3)

Installing a blocking cock (21, 22; cock) for each washable length in the drain pipe (1), and installing the blocking cock and saddle for installing the saddle (3, 4) before and after the cock (21, 22); Through the saddle (3) of one side of the drain pipe (1), the hanging outlet (51) is inserted into the primary tow line (5), the mouth cock (21) is opened, and the water is sent to the open saddle (4) on the other side. Install the primary tow line 5 by dragging 51 and directing it to the exiting saddle 4, and when the first tow line 5 reaches the exiting saddle 4, a second to the first tow line 5 Tow line installation steps connecting the car tow line (6): A weight 71 is installed at the end of the absorption pipe 7 connected to the suction pump, and the absorption pipe 7 is pulled by the second tow line 6 to reach the exit saddle 4 area, and then the residual water is sucked by the suction pump. A suction step of pulling the absorption tube 7 toward the entrance saddle 3 while suctioning and discharging the suction tube 7 so that the end of the absorption tube 7 withdraws the residual water in the drain pipe by the weight 71; Connect the cleaning hose (8) provided with the cleaning nozzle (81) to the secondary tow line (6), and pull the cleaning hose (8) toward the exit saddle (4) from the exit saddle (4) side to the entrance saddle (3). Spraying the cleaning agent on the inner wall of the drain pipe; A washing step of washing the inside of the drain pipe after spraying the cleaning agent; After completing the water washing, closing both saddles 3 and 4 and opening both cocks 21 and 22 for final water flow; Chemical cleaning method of the drain pipe, characterized in that consisting of. The method of claim 1, wherein the cleaning step of spraying the chemical cleaning method of the drain pipe, characterized in that the spraying of the cleaning agent at a pressure of 20 to 80 bar. The method according to claim 1 or 2, wherein the washing step comprises a process for neutralizing the residual cleaning agent in addition to the water washing.

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