KR20130026470A - Temporary piping system for the selected range flow from the whole piping system - Google Patents

Abstract

PURPOSE: A temporary piping system for a selected section in a whole piping system is provided to form a temporary fluid passage which allows the free access of fluid and blocking the fluid to flow in the random position of a large diameter pipe by supplying air into an air bag. CONSTITUTION: A temporary piping system for a selected section in a whole piping system comprises an air bag(10), a temporary expansion pipe(30), a pulling wire(20), a wire fixing device(60), a temporary valve(40) and a pipe sealing device(50). The air bag is composed of a vinyl bag and the center wire which is equipped with an air supplying passage. The temporary expansion pipe is connected to the free end of a branching device. The pulling wire is connected with one end of the air bag and is equipped with an air supplying passage by passing through the branching device. The wire fixing device is connected with the free end of the branching device in order to fix the position of the pulling wire. The temporary valve is branched from the center of the temporary extension pipe. The pipe sealing device is positioned in an area in which the pulling wire and a small pipe penetrate the temporary expansion pipe. [Reference numerals] (10) Air bag; (100) Large-diameter pipe; (110) Manhole; (120) Small pipe; (130) Cut-off valve; (20) Pulling wire; (30) Temporary expansion pipe; (40) Temporary pipe; (50) Pipe sealing device; (60) Wire fixing device

Description

Temporary Piping System for the Selected Range Flow from the Whole Piping System}

The present invention relates to an apparatus and method for temporarily blocking some sections of a complex piping system to temporarily form a flow path that was not originally present, dividing the pipe into partial sections, and changing the flow path for this purpose.

In some places, such as power plants and heavy chemical plants, temporary piping of the same size and strength as the original piping system is used to temporarily block some sections of a complex piping system. However, these facilities, which have been invested at a large cost, have to minimize the construction period and operate the facilities to improve the management. In many cases, they do not have enough space and time to construct these temporary facilities at the original scale. In order to temporarily use a part of a complicated piping system, as shown in FIG. 6, a plugging device for temporarily blocking the pipe may be used for a pipe of the same size as the original piping system, or additionally, a valve similar to the original size may be additionally constructed. Are coming to use.

As a prior art in this field, US Patent 4398565 (Aug. 16, 1983) "Pipe Plugging Apparatus" discloses a technique for blocking the inside of a pipeline using an air bag. However, this technique has a disadvantage in that a separate device must be provided to fix the air bag after the pipe is blocked using the air bag. Therefore, in the present invention, when the air bag is blocked by the air bag, but the air bag is not a problem in the flow rate without being pushed by the pressure of the fluid such as hydraulic pressure, hydraulic pressure, air pressure, the flow path using the existing vent or drain line It relates to a technique for forming a.

In large-scale piping systems, such as power plants and petrochemical plants, the method and order of operation of the associated equipment is determined so that the fluid flows in a constant direction. However, it is necessary to temporarily change the flow path, such as plant cleaning work, and for some sections of the complex piping system where the operation method and the order of the piping system valves and pumps need to be changed, a piping system having a strength similar to that of the original piping system is required. In order to block the flow path in a simple way without additional construction, we have developed an alternative means that can function as a valve, and plan to establish a new flow path while minimizing additional piping work.

In order to shut off the flow path in a simple way and to minimize additional plumbing work, the flow path blocking method allows the air bag to function as a valve by inflating the air bag into the pipe and inflating the air bag. It is kept in tension by a string so that it is not pushed out. If possible, use a vent or drain line of the pipe, but if necessary, connect it to a manhole. It can withstand the axial thrust applied to the pipe. This line must pass through the pipe so that it can be secured to the outside.

Implement the same function through air bags, vents, and drain lines without building large-scale temporary piping work in constructing lines for cleaning or other purposes, such as power plants or heavy chemical facilities, which are composed of complex piping systems. This allows for a short period of time and can be restored to its original state, making a significant contribution to the cleaning of piping systems and the construction of temporary pipelines.

1 is a view illustrating an embodiment of cleaning and flow path changing apparatus for each partial section of a pipe according to the present invention;
Figure 2 is an embodiment of the cleaning and flow path changing apparatus for each section of the pipe according to the present invention
Figure 3 is an embodiment of the air bag and pull string according to the present invention
Figure 4 is an embodiment of an air bag according to the present invention
Figure 5 is an embodiment of the temporary flow path for cleaning the power plant according to the present invention
Figure 6 is an embodiment of the temporary flow path for cleaning according to the prior art

During the operation of plant piping facilities, it is difficult to make a predetermined flow path due to the failure of some facilities, improvement of equipment, chemical cleaning and steam cleaning, air cleaning, etc. If you want to open a conventional plumbing fittings work is often difficult or enormously cumbersome. Particularly, at the end of the construction of the pipeline, in order to remove foreign substances in the piping, it is necessary to adjust some lines or modify the construction progress plan to form a flow path unlike existing piping when performing steam blowing or acid cleaning. In order to effectively do this, there is a need for a method that can change the flow path in a simple manner while using the existing plumbing facilities.

Accordingly, the present invention is a pipe having a branching device such as a manhole 110 or a small pipe 120 is connected to the large diameter pipe 100, the center bag 12 having a plastic bag 11 and the air supply flow path The air bag 10, a temporary extension pipe 30 connected to the free end of the branching device, a pull line 20 connected to one end of the air bag, and having an air supply passage while penetrating the branching device, the branch A string fixing device 60 connected to the free end of the device and fixing the position of the pulling string, a temporary valve 40 branching out of the middle of the temporary extending pipe, the pulling string and the small pipe connect the temporary extending pipe. Including a pipe sealing device 50 provided in the penetrating place, supplying air to the air bag to block the flow path at any position in the large diameter pipe, and the position of the place where the flow path is blocked The length of the pull string connected between the bag and the string holding device is determined, and the axial thrust caused by the pressure exerted on the air bag is held by the tension of the pull string based on the string holding device. Forming, and relates to the cleaning and flow path changing device for each section of the pipe, characterized in that for supplying a fluid through the temporary valve.

The large-diameter pipe 100 is all pipes installed in an industrial facility such as a power generation pipe or an oil refinery chemical plant to make fluid flow into the pipe, and refer to all pipes related to the process as shown in FIG. 5. Therefore, in the present invention, the large diameter pipe refers to all industrial piping systems through which fluid flows to perform a certain purpose rather than a large size pipe, but in the present invention, a small pipe such as a pipe made for a vent or a drain is usually used. It is referred to as a large diameter pipe in the sense of a pipe forming a main flow passage relatively larger in size than the pipe 20.

The manhole 110 is a manhole of a conventional meaning made for inspection of a pipe, a header, a tank, and the like.

The small pipe 120 is a pipe made of a short line made for venting or draining as described above so that the shutoff valve 130 is connected and one end of the pipe 120 is not necessarily a closed loop.

A branching device is a facility provided such that a manhole or a small pipe is connected at one end to a large diameter pipe to be separated, and the other end is opened. In the present invention, the shutoff valve 130 and the manhole 110 correspond.

Vinyl Bag (11, Vinyl Bag) is the same as a conventional rubber tube is an elastic material having a low elastic modulus, such as rubber or vinyl reinforced with high-strength fibers to prevent bursting at high pressure reflecting the high pressure of the industrial piping Refers to a balloon-like form.

An air supply flow path means supplying air using a conventional hose.

The center strap 12 is to use a high strength rope or wire in the center of the plastic bag so that the plastic bag does not extend beyond the length of this center end in the axial direction of the large diameter pipe, and the center strap is both ends Since it should be firmly bonded to the body of this plastic bag, where both ends of the center strap meet the vinyl of the vinyl bag, it must be joined with fiber reinforced ones so that the axial thrust of the large diameter pipe of the plastic bag is not damaged.

The air bag 10 is composed of a central string 12 having an air supply flow path using a hose or the like in the above-described plastic bag 11 as shown in FIG. In particular, when the pressure of the fluid is high, as illustrated in FIG. 4, a plurality of air bags may be disposed in a direct line, and spaces may be provided between the bags to be labyrinth seals. In this case, it is possible to give the airbag a rough and thick fiber such as a bead of the tire.

The free end is a place in which one end of the pipe is in contact with air in an expression corresponding to a fixed end of a portion where one end of the pipe is joined to the large-diameter pipe having a long length.

The free end of the branching device means that the branching device is not a part joined to the large-diameter pipe, but the end of the branching device is exposed to the atmosphere. In FIG. 1, the free end of the branching device is connected to the valve below the shutoff valve 130. Since the pipe is no longer connected to other pipes in a short length state, it is called a free end, and the small pipe 120 of FIG. 1 is a branched pipe because it is separated from a large diameter pipe.

Temporary extension pipe 30 means a pipe temporarily connected to the free end of the branching device is a pipe to be dismantled when the temporary work is completed, which is the purpose of the present invention. Therefore, in order to facilitate dismantling after temporary work, the method of connecting with the free end of the branching device is preferably connected to the free end of the branching device by using a pipe having a larger inner diameter than the free end of the branching device. Seal the gap in the seal with a seal, etc. to prevent the fluid from leaking out. The method of connecting the pipe and the pipe using the packing or the like without welding the pipe may be a commercial method used in the pipe connecting technology, and thus, the present invention will not be described in detail any further.

The pull string 20 should be a member having an air supply flow path such as an air supply hose while having good bending characteristics with a string, a rope or a wire connected to one end of the air bag. Therefore, a hose reinforced with high tension fibers may be used, or a conventional high tension hose and a conventional air supply hose may be used. The pull string is connected to one end of the air bag in the large diameter pipe and passes through the manhole or small pipe branched from the large diameter pipe, and also through the temporary extension pipe, and secured by a string fixing device connected to the outside of the temporary connection pipe. do. Therefore, when the fluid flows or fills the large diameter pipe, the air bag is pushed in the axial direction of the large diameter pipe under the pressure of the fluid. To prevent the bag from slipping in the large life pipe, the string fixing device should hold the pull string tightly. Therefore, adjusting the length of the pulling line should ensure that the pulling line between the position of the air bag and the line holding device is kept at a constant distance with tension.

The string holding device 60 is connected to the free end of the branching device, and typically uses a rope fixing device to fix the position of the pulling string, and the rope fixing device is well known commercially and is not described herein any further.

Temporary valve 40 is a valve which is mounted on a pipe having a small diameter typically branched from the middle of the temporary extension pipe as shown in FIG. 1 to additionally connect a fluid supply line to the valve to perform necessary temporary work.

The pipe sealing device 50 is provided where the pulling line and the small pipe pass through the temporary extension pipe so that there is no leakage of fluid between the temporary extension pipe and the pulling line. Since the technique of the sealing device may be applied, it is not mentioned anymore in the present invention. It is easy to implement a sealing device composed of the stem and the packing of the valve.

When one end of the large diameter pipe 100 is open in forming a new flow path, the temporary blocking plate 70 and the plate fastener 71 are installed in an open position as illustrated in FIG. You can prevent it from flowing out. This can be applied to the plant under construction or maintenance, and during construction, select only a part of the section and install the air bag at the end of the opening as shown in FIG. 3 and blow air to block the end of the large diameter pipe, and the thrust generated therein Fixing to large diameter pipe through the plate fastener using a temporary blocking plate 70 as a device to receive. Here, too, the air bag is fastened to the line fixing device attached to the temporary blocking plate through the pulling line. Plate fasteners use fasteners in the same way as C clamps.

When air is supplied to the air bag, the air bag will inflate, and the air bag will no longer expand due to the center end in the axial direction of the large diameter pipe, so it expands in the radial direction of the large diameter pipe and the plastic bag compresses the inner surface of the large diameter pipe. In this case, the fluid can no longer leak along the circumference of the airbag. When air is supplied to the air bag and inflated in the radial direction of the large diameter pipe, the air bag inflated with air at an arbitrary position in the large diameter pipe blocks the flow path. However, the air bag inflated with air can be axially slid by the pressure of the fluid in the large diameter pipe, so that the air bag can be fixed to a fixed place without slipping the position where the flow path is blocked at any place in the large diameter pipe. The length of the pull string connected between the bag and the rope fixing device is adjusted before the bag is fully inflated, and the axial thrust caused by the pressure applied to the air bag is held by the tension of the pulling wire based on the rope fixing device. . In this way, the inflated air bag acts as a valve to block the flow path in the large-diameter pipe, and the fluid through the temporary valve enters or exits the large-diameter pipe to allow the flow path to flow in a constant direction. This free temporary flow path is formed.

5 is a flow diagram of a piping fluid of a combined cycle power plant disclosed at www.netl.doe.gov. In FIG. 5, a pipe for cleaning some sections of the power plant is illustrated, in which case, an air bag (10C) is installed at an HP Economizer inlet, and an air bag (10A) is installed at an HP Superheater outlet pipe entering a turbine. , A cleaning system in which an air bag (10B) is installed at a branch from the outlet pipe of the feed water pump (HP / IP BFP), the 10A and 10C are connected to the temporary cleaning pipe 200, and the temporary cleaning pump 210 is operated and circulated. Can be configured. In this case, the cleaning water entering the HP Economizer passes through the HP Evaporator, through the three HP Superheaters, through the HP Steam pipe to the turbine, and then through the high pressure temporary cleaning pipe, the temporary cleaning pump, and the low pressure temporary cleaning pipe. To build. Here, in the case of air blowing using air instead of the water washing line, only one of the high pressure side cleaning pipe or the low pressure side cleaning pipe is used, and the cleaning pump 210 does not necessarily mean only the pump but uses air. In this case, the air is blown from one side of some of the pipes to be cleaned by using a cleaning air compressor, and the air mixed with the foreign material is blown out.

In order to apply this to the plant piping through the above devices, it can be applied in the following way.

In a pipe in which a branch device such as a manhole 110 or a small pipe 120 is connected to a large diameter pipe 100, fastening a temporary extension pipe 30 equipped with a temporary valve 40 to the branch device, Inserting the air bag (10) and the pull cord (20) having a guide rod into the temporary extension pipe through the temporary extension pipe and the branching device into the large diameter pipe (100), and Installing a pipe sealing device (50) provided at a place where a small pipe passes through the temporary extension pipe, and connected to the free end of the branch device, and using the wire holding device (60) to fix the position of the pulling line; Setting a position of the bag, blowing air into the air bag to block the flow path by pushing the large diameter pipe 100, and supplying fluid through the temporary valve Apply sequentially.

With this apparatus and method, the air bag 10 shuts off the flow path as if the conventional valves were installed in any section of the pipe, and the thrust pulling rope 20 to bear the new flow path was generated. To reduce the construction of new pipelines by using lines such as vents and drains in existing pipes by breaking the conventional method of cutting the main pipe and welding new pipes to form. You can work on it.

10: air bag
20: pulling string
30: temporary extension pipe
40: temporary valve
50: pipe sealing device
60: line anchor

Claims (2)

In the pipe where the branching device such as the manhole 110 or the small pipe 120 is connected to the large-diameter pipe 100,

An air bag 10 composed of a plastic bag 11 and a central string 12 having an air supply flow path;
A temporary extension pipe (30) connected to the free end of the branch device;
A pull string 20 connected to one end of the air bag and having an air supply passage while penetrating the branch device;
A string fixing device (60) connected to the free end of the branching device and fixing the position of the pulling string;
A temporary valve 40 branched out of the middle of the temporary extension pipe;
And a pipe sealing device (50) provided at the place where the pulling line and the small pipe pass through the temporary extension pipe.

Supplying air to the air bag to block the flow path at an arbitrary position in the large-diameter pipe, and determine the position of the place where the flow path is blocked by adjusting the length of the pulling string connected between the air bag and the string fixing device, Characterized in that the axial thrust due to the pressure applied to the air bag is sustained by the tensile force of the pull string based on the string holding device to form a temporary flow path, and supply the fluid through the temporary valve And channel changing device for each section In the pipe where the branching device such as the manhole 110 or the small pipe 120 is connected to the large-diameter pipe 100,

Fastening the temporary extension pipe 30 with the temporary valve 40 to the branch device;
Inserting a deflected air bag (10) and a pull string (20) provided with a guide rod into the temporary extension pipe through the temporary extension pipe and the branching device into the large diameter pipe (100);
Installing a pipe sealing device (50) provided at a place where a pull line and a small pipe pass through the temporary extension pipe;
Setting the position of the air bag with a string fixing device (60) connected to the free end of the branching device to fix the position of the pulling string;
Blowing air into the air bag so that the air bag pushes the large diameter pipe 100 to block a flow path;
Supplying a fluid through the temporary valve;

Method for cleaning and changing the flow path for each section of the pipe, characterized in that it comprises

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