KR101750045B1 - The Method for tracking pig using pressure and flow rate of sending fluid - Google Patents

The Method for tracking pig using pressure and flow rate of sending fluid Download PDF

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KR101750045B1
KR101750045B1 KR1020150138162A KR20150138162A KR101750045B1 KR 101750045 B1 KR101750045 B1 KR 101750045B1 KR 1020150138162 A KR1020150138162 A KR 1020150138162A KR 20150138162 A KR20150138162 A KR 20150138162A KR 101750045 B1 KR101750045 B1 KR 101750045B1
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South Korea
Prior art keywords
pig
flow rate
pipe
pressure
bend
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KR1020150138162A
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Korean (ko)
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KR20170038574A (en
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김기성
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전남대학교산학협력단
주식회사 코인즈
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/26—Pigs or moles, i.e. devices movable in a pipe or conduit with or without self-contained propulsion means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/26—Pigs or moles, i.e. devices movable in a pipe or conduit with or without self-contained propulsion means
    • F16L55/28—Constructional aspects
    • F16L55/30—Constructional aspects of the propulsion means, e.g. towed by cables
    • F16L55/38—Constructional aspects of the propulsion means, e.g. towed by cables driven by fluid pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/26—Pigs or moles, i.e. devices movable in a pipe or conduit with or without self-contained propulsion means
    • F16L55/48—Indicating the position of the pig or mole in the pipe or conduit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L2101/00—Uses or applications of pigs or moles
    • F16L2101/10—Treating the inside of pipes
    • F16L2101/12—Cleaning
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L2101/00—Uses or applications of pigs or moles
    • F16L2101/30—Inspecting, measuring or testing

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Pipeline Systems (AREA)
  • Cleaning In General (AREA)

Abstract

TECHNICAL FIELD The present invention relates to a technique for locating a pig using pressure and flow rate of a pressurized fluid, and more particularly, to a method of locating a pig by moving along the inside of a pipe having a plurality of bend portions, such as a heating furnace of a petrochemical plant, And the piping position is calculated based on the flow rate and the pressure of the pip feeding fluid in order to track the position of the piping to be diagnosed. To a device capable of accurately tracking the position of the object in real time.

Description

BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to a method for tracking a pig's position using pressure and flow rate of a pressurized fluid,

TECHNICAL FIELD The present invention relates to a technique for locating a pig using pressure and flow rate of a pressurized fluid, and more particularly, to a method of locating a pig by moving along the inside of a pipe having a plurality of bend portions, such as a heating furnace of a petrochemical plant, And the piping position is calculated based on the flow rate and the pressure of the pip feeding fluid in order to track the position of the piping to be diagnosed. To a device capable of accurately tracking the position of the object in real time.

Pig means a device for cleaning or diagnosing the inside of a pipe or a pipe in a facility such as a petrochemical plant, a gas and a crude oil transfer line, and is also called a diagnostic device, an inspection device, or a probe device.

Depending on the purpose of use, the pig can be used for cleaning the pipe during construction, cleaning pigments to remove rust, residual foreign matter (welding rod, sand, mud, etc.) Descaling pig which removes the scale generated inside the piping and restores the flow and pressure to the design value at the time of construction, discharging the product inside the piping to facilitate piping work and replacement work evacuation pigs, heating pipes, and decoking pigs to prevent the loss of heat due to the removal of coke of iron and iron, which is formed on the inner wall of pipe, and energy loss due to pressure rise. And the shape and the material thereof are also varied as shown in Fig.

On the other hand, these pigs are mainly used for the maintenance and repair of pipelines constituting the decomposition furnace, heating furnace, reforming furnace, etc. of petrochemical plants. Especially, the technology of using pigs for cleaning or diagnosing heating furnace piping is attracting attention have.

The heating furnace is a facility for heating and supplying crude oil, naphtha, and natural gas for refining and reaction processes at refinery and petrochemical plants. It is composed of pipes having diameters of 2.5 to 6 inches depending on the type and processing capacity.

However, since crude oil, naphtha, and the like are transferred to the inside of the heating furnace while being in contact with the combustion gas and heat transfer is caused by radiation or convection, coke is likely to be generated on the inner wall of the pipe as shown in FIG. Etc., which may cause the productivity to deteriorate. In severe cases, the heat may be disturbed and the heat may be concentrated, causing the piping to be destroyed.

In order to prevent such a problem, it is necessary to diagnose the inside of the pipe and remove the coke by using a device such as the above-mentioned cleaning pig. The piping of the heating furnace described above mainly has a structure in which a plurality of U- And the coke is firmly attached to the inner wall. Therefore, it is necessary to use a method of changing the forward direction of the pig from the forward direction to the reverse direction depending on the situation.

Therefore, it is not easy to predict the position of the piping in the piping. However, in order to efficiently perform the cleaning or diagnosis, it is important to accurately track the position of the pig. In the prior art for tracking the position of the pig, (Magnetic Pig Detector) which detects a magnet by attaching a magnet to the pig, and when the pressure of the fluid for feeding the pig is relatively increased, the pig is regarded as passing through the U-shaped bend portion And a method of roughly grasping the position of the pig.

However, as described above, the method of detecting the position of the pig by using an electric signal or a magnet can not be used in a pipe which is inaccessible because the tube is closely arranged like a heating furnace.

In addition, the conventional technique of grasping the position of the pigs by the pressure of the fluid that pressurizes the pigs has a limitation in accurately grasping the position of the pigs in real time in the piping of the heating furnace in which many U-shaped bend portions exist.

Therefore, there is a need for a technique capable of accurately tracking the position of a pig in real time even in a pipe having a plurality of curved portions and a tube closely arranged.

Patent No. 1,424,070 (Jul. 22, 2014)

In order to solve the above-mentioned problems of the prior art, the present invention relates to a method of cleaning a piping inside a pipe having a plurality of bending parts, such as a heating furnace of a petrochemical plant, It is possible to accurately track the position of the pig in a narrow or high temperature pipeline by measuring the flow rate and pressure of the fluid and calculating the positional distance of the pig based on the formula.

In order to solve the above-described problems of the prior art, the present invention is directed to a method of cleaning a pipe (1) having at least one bending portion (l) and cleaning or diagnosing the inside of the pipe (1) 2 is moved from the at least one end of the pipe 1 to the inside of the pipe 1 in order to move the pig 2 inside the pipe 1, A flow rate sensor (5) installed at at least one end of the discharge port (4) of the pump (3) and / or the pipe (1) (7) for calculating the positional distance (S) of the pig (2) based on the measured values of the flow sensor (5) and the pressure sensor (6) And an output section (8) for outputting the position of the pig (2) based on the position distance (S) It provides a location tracking device of pigs and using the flow rate.

The pig position tracking apparatus of the present invention further comprises a control valve 9 for controlling the flow rate of the pressurized fluid injected into the pipe 1 and a control valve 9 for controlling the flow rate of the pressurized fluid, And a control unit 10 for controlling the movement of the pig 2 by controlling the opening and closing of the control valve 9. [

Or an engine 11 for controlling the power supplied to the pump 3 and an output of the engine 11 based on data on the position of the pig 2, And a control unit 10 for controlling the apparatus.

At this time, the output unit 8 is preferably a device for displaying the position of the pig 2 on the three-dimensional design diagram of the pipe 1.

According to another embodiment of the present invention, the position of the pig 2 moving along the inside of the pipe 1 having at least one bending portion 1 and cleaning or diagnosing the inside of the pipe 1 Specifically measuring the flow rate and pressure of the pressurized fluid for moving the pig (2) within the pipe (1), measuring the flow rate and pressure of the pig (2) on the basis of the measured flow rate and pressure, And a step of outputting the position of the pig (2) based on the calculated position distance (S), and a method for tracking the position of the pig using the pressure and flow rate of the pressurized fluid Can be provided.

The data processing step may include obtaining a measured pressure and a flow rate, and determining whether the measured pressure is a maximum value (M), and when the measured pressure is a maximum value (M) (S) of the pig (2) by calculating a curved tube part function based on the length of the tube (1) from the starting point (A) of the tub (2) to the curved tube part Calculating a flow rate utilization coefficient based on a flow rate utilization factor correction function based on the flow rate utilization factor correction function, and storing and updating the flow rate utilization factor, and when the measured pressure is not the maximum value (M) Calculating the positional distance S of the pig 2 by calculating the straight pipe function based on the measured flow rate and the stored flow rate utilization coefficient.

The curvature function can be expressed by the following equation (1), and the flow rate coefficient correction function can be expressed by the following equation (2), and the intrinsic function can be expressed by the following equation (3).

[Equation 1]

Figure 112015094910216-pat00001

(S: position distance of the pig, D n : length of piping from the starting point to the nth bend, Ⅰ: when the pig moved in the forward direction from the n-1 th bend, Ⅱ: When moving in the reverse direction)

[Equation 2]

Figure 112015094910216-pat00002

(C n: n-1-th track tube and the n-th track the flow rate using the coefficient of the tube between the section, D n: pipe length from the starting point to the n-th track tube, t n: the time over parts of Pigment an n-th bend time, Q: The momentary flow at time t, A: The cross-sectional area of the pipe, I: The pig moved in the forward direction from the n-1 th bend, II: The pig moved in the reverse direction from the n-1 th bend )

[Equation 3]

Figure 112015094910216-pat00003

(S (t): t time position distance pig in, D n: pipe length of the n-th song tube from the starting point, t n: time when the pig has passed parts of n-th bend, C n: n-1-th track (T): Flow rate at time t, A: Cross-sectional area of pipe, Ⅰ: When the pig moved in the forward direction from the n-1 th bend, Ⅱ: Is moved in the reverse direction from the (n-1) th bending portion)

On the other hand, it is preferable that the flow rate coefficient C 0 of the section between the starting point A and the first bending section has a value based on the shape of the pig 2.

The data processing step of the present invention may also be designed to additionally calculate the speed of the pig 2 according to Equation 4 below.

[Equation 4]

Figure 112015094910216-pat00004

(v (t): n- 1 -th track tube and the n-th song speeds, C n at t the time of the pig to move between the section tube: n-1 flow rate using coefficient between the second track tube and the n-th song tube section , Q (t): instantaneous flow rate at time t, A: cross-sectional area of piping)

According to an embodiment of the present invention, there is provided an apparatus for tracking the position of a pig moving along the inside of a pipe having a plurality of bending portions such as a heating furnace of a petrochemical plant and cleaning or diagnosing the inside of the pipe, And the pressure is measured. Based on this, the positional distance of the pig is calculated according to a specific formula, so that the position of the pig can be accurately tracked in real time even in a pipe having a plurality of curved portions and a tightly arranged tube.

In addition, a control valve for controlling the flow rate of the pressurized fluid or an engine for controlling the power supplied to the pump and a control unit for controlling the engine are additionally provided, so that the movement of the pig can be effectively controlled based on the data of the position of the pig.

Fig. 1 shows a pig's body having various types of materials and shapes.
Fig. 2 shows a state in which coke is accumulated inside the heating furnace pipe.
Fig. 3 is a view of a heating furnace pipe having a structure in which a plurality of U-shaped bending parts are repeated.
FIG. 4 schematically shows an apparatus for tracking a position of a pig 2 using a pressure and a flow rate of a pressurized fluid according to an embodiment of the present invention.
5 shows a flowchart used to calculate the positional distance S of the pig 2 in the data processing unit 7 according to an embodiment of the present invention.
Fig. 6 schematically shows a plurality of bending portions (l) in the piping 1 in order.
Fig. 7 is a schematic view showing how the pig 2 is deformed when it passes through the bending portion (l) of the pipe 1. Fig.
8 is a graph showing pressure and flow rate changes over time based on the values measured by the pressure sensor 6 and the flow sensor 5 according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. Prior to the description, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary meanings and should be construed in accordance with the technical concept of the present invention.

Throughout this specification, when an element is referred to as "including" an element, it is understood that it may include other elements as well, without departing from the other elements unless specifically stated otherwise.

Each step may be performed differently than the order specified unless explicitly stated in the context of the specific order. That is, each of the steps may be performed in the same order as described, or may be performed substantially concurrently or in the reverse order.

It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the difference that the embodiments of the present invention are not conclusive.

In describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements.

When a component is described as being "connected", "coupled", "installed", or "connected" to another component, the component may be directly connected or connected to the other component, It is to be understood that other components may be "connected,""coupled,""installed," or "connected."

FIG. 4 schematically shows an apparatus for tracking a position of a pig 2 using a pressure and a flow rate of a pressurized fluid according to an embodiment of the present invention.

The apparatus for tracking a position of a pig using a pressure and a flow rate of a pressurized fluid according to the present invention includes a pip (1) A pump for injecting a pressurized fluid from at least one end of a pipe to the inside of the pipe (1) for moving the pig (2) inside the pipe (1) A flow sensor 5 provided on at least one end of the discharge part 4 of the pump 3 and / or the pipe 1 for measuring the flow rate of the fluid to be fed and a pressure sensor 6 for measuring the pressure, (S), which is the distance from the starting point (A) of the pig (2) to the point (C) where the pig (2) is located, based on the measured values of the flow sensor (5) A data processing section 7 for calculating the position of the pig 2 and an output section 8 for outputting the position of the pig 2 on the basis of the calculated position distance S .

The pigs 2 are transported to the inside of the pipe 1 and move along the inside of the pipe 1 to perform cleaning of pipes for removing foreign matter such as coke formed inside the pipe 1, The state is diagnosed.

At this time, the above-described cleaning pig, descaling pig, evacuation pig, decoking pig and the like may be used as the pig 2 without limitation, and in particular, Intelligent pigs specialized in the diagnosis of defects inside the piping may also be used.

In addition, as the material of the pig (2), a polyurethane resin suitable for removing water, dust or small debris from the inside of the pipe, Urethane foaming resin suitable for removing dust, debris, rust, iron oxide or highly- Urethane (polyurethane) coating resin can be used. In addition, materials such as carbon steel and bronze can be used without limitation.

The apparatus for locating the pig 2 of the present invention is suitable for cleaning and diagnosing a pipe 1 having at least one bending part l and the bending part l is a bending part bent in a U- However, the angle is not particularly limited. In particular, the pipe 1 is preferably a pipe constituting a heating furnace of a petrochemical plant, but is not limited thereto.

In order to move the pig (2) in the pipe (1), a pressurized fluid such as water should be injected into the pipe (1) into which the pig (2) is injected. The pump 3 may include a pump 3 for injecting a pressurized fluid from the starting point A of the pig 2 to the inside of the pipe 1 at both ends of the pipe 1, The pressurized fluid can be injected also at the end point B which is the opposite end of the pipe 1.

At this time, when the pressure at the starting point A is higher, the pig 2 moves in the forward direction, which is the direction of the arrival point B. When the pressure at the arrival point B is higher, the pig 2 moves in the reverse direction .

On the other hand, a flow rate sensor 5 is provided in the discharge part 4 of the pump 3 to measure the flow rate of the pressurized fluid. The flow rate of the pressurized fluid is measured at the end (start point A or end point B) A pressure sensor 6 is provided to measure the pressure of the pressurized fluid. In this case, the measured flow rate includes both the average flow rate and the instantaneous flow rate. The pressure sensor 6 can be installed at both ends of the pipe 1, It is more preferable because it can measure accurately. Optionally, the flow sensor 5 may be installed at at least one end of the pipe 1, and the pressure sensor 6 may also be installed in the discharge part 4. [

The data on the flow rate and the pressure value measured by the flow sensor 5 and the pressure sensor 6 are transmitted to the data processing unit 7. The data processing unit 7 inputs the data to the set function, And calculates the positional distance (S) of the object (2).

In this specification, the position distance S of the pig 2 refers to the length of the pipe 1 from the starting point A to the point where the pig 2 is located, as shown in Fig.

The calculated data of the positional distance S is transmitted to the output unit 8 and the position of the pig 2 is output based on the data. Software for displaying the position of the pig 2 on the three-dimensional design diagram of the pipe 2, a display device, and the like may be included in the pipeline 2, But is not limited thereto.

The apparatus for tracing the pig position according to the present invention includes a control valve 9 for controlling the flow rate of the pressurized fluid injected into the pipe 1 or a control valve 9 for controlling the power supplied to the pump 3 (2) by controlling the opening and closing of the control valve (9) or the output of the engine (11) based on information on the position of the engine (11) and the pig And a control unit 10 for controlling the display unit.

That is, when the pig 2 is moving in the forward direction and is not cleaned or diagnosed while it is blocked by an obstacle such as coke or the like, the control unit 10 transmits the data to the data processing unit 7 or the output unit 8 And controls the opening and closing of the control valve 9 to adjust the flow rate of the pressurized fluid injected toward the start point A or the destination point B to move the pig 2 in the reverse direction.

Alternatively, the control unit 10 may control the movement of the pig 2 by adjusting the flow rate and pressure of the pressurized fluid discharged from the pump 3 by adjusting the output of the engine 11, The movement of the pig (2) can be operated more efficiently by simultaneously controlling the valve (9) and the engine (11).

5 shows a flowchart used to calculate the positional distance S of the pig 2 in the data processing unit 7 according to an embodiment of the present invention and FIG. And the bending portion (l) is schematically shown in order.

The present invention can include a method of tracking the position of a pig by using the pressure and flow rate of the pressurized fluid in addition to the above-described apparatus for tracking a position of the pig. Specifically, Measuring the flow rate and pressure of the pressurized fluid for moving the pig (2) inside the pipe (1) in a method of tracing the position of the pig (2) moving or diagnosing the inside of the pipe (1) A data processing step of obtaining the positional distance S of the pig 2 based on the measured flow rate and pressure and a step of outputting the position of the pig 2 based on the calculated positional distance S .

Data processing step of the present invention The steps that can be taken in the data processing part 7 described above include obtaining the measured pressure and flow rate as shown in FIG. 5 and determining whether the measured pressure is a minimum value M And calculates a tug section function based on the length of the pipe 1 from the starting point A of the pig 2 to the bending section 1 when the measured pressure is the maximum value M, Calculating a flow rate utilization factor correction function based on the measured flow rate to obtain a flow rate utilization factor, and storing and updating the flow rate utilization factor, wherein the measured pressure is a maximum value (S) of the pig (2) by calculating an introductory part function based on the measured flow rate and the stored flow rate utilization coefficient when the flow rate is not the predetermined value (M) Calculable .

Since the pig 2 travels through the pipe 1 due to the pressure of the pressurized fluid and then passes through the bending portion 1 as shown in Fig. 7, the pig 2 must be deformed, The fluid pressure must be increased.

Therefore, it is possible to know whether or not the pig 2 is passing through the bending portion (l) from the measured data of the pressure in the pipe 1, and it is possible to determine whether or not the pressure sensor 6 of the above- It can be seen that when the pressure reaches the maximum point of the peak in the graph showing the pressure change with time based on the value obtained when the pig (2) passes through the bending part (1).

Or the flow rate measured at the end point of the arrival point B has an extreme value m as a result of the deformation of the pig 2 reaching the bending portion l, It is possible to grasp when the curved portion passes through the curved portion.

After the data on the measured pressure and the flow rate are obtained, it is determined whether the pressure has the maximum value M and the next step is performed. First, when the pressure has the maximum value M, The positional distance S of the pig 2 is calculated according to the curved tube portion function since it means that it is located in the curved tube portion l.

Here, the curvature function can be expressed by the following equation (1).

[Equation 1]

Figure 112015094910216-pat00005

(S: position distance of the pig, D n : length of piping from the starting point to the nth bend, Ⅰ: when the pig moved in the forward direction from the n-1 th bend, Ⅱ: When moving in the reverse direction)

That is, since the position distance S of the pig 2 is equal to the distance from the starting point A to the bending portion l, the pig 2 is in a state where it has already passed the n-1th bending portion The positional distance S p of the ram nose 2 is equal to the distance to the n-th curvature portion l.

Similarly, in the reverse direction, since the pig 2 having already passed through the (n-1) th curved portion is located at the (n-2) th curved portion (l), the positional distance S can be obtained through Equation (1).

Meanwhile, in the data processing step or the data processing unit 7, the flow rate utilization coefficient is calculated by calculating the flow rate utilization factor correction function together with the calculation of the position distance S of the pig 2 as described above.

The flow rate utilization coefficient is a value required to calculate the position distance S in the straight pipe section, which will be described later, as a variable meaning a ratio actually used for feeding the pig 2 out of the flow rate fed into the pipe 1, May vary depending on the position of the pipe 1, but can be regarded as a constant constant in the section of the straight pipe between the adjacent bending portions (1).

The flow rate utilization factor correction function can be expressed by the following equation (2).

[Equation 2]

Figure 112015094910216-pat00006

(C n: n-1-th track tube and the n-th track the flow rate using the coefficient of the tube between the section, D n: pipe length from the starting point to the n-th track tube, t n: the time over parts of Pigment an n-th bend time, Q: The momentary flow at time t, A: The cross-sectional area of the pipe, I: The pig moved in the forward direction from the n-1 th bend, II: The pig moved in the reverse direction from the n-1 th bend )

That is, when water as an incompressible fluid is used as the pressurized fluid, the volume of the pig 2 per unit time is equal to C n * Q (t), and a part of the pressurized fluid is transferred to the pig 2 The flow rate utilization factor can be obtained as shown in Equation (2).

On the other hand, the flow rate utilization coefficient C 0 of the section between the starting point A and the first bending section 1 may have a value based on the shape of the pig 2.

The flow rate utilization coefficient calculated when the pig 2 passes the bending portion 1 is stored in the storage device included in the data processing section 7 and can be used for calculation of the straight pipe function by being corrected or updated to a new value.

Next, if the pressure does not have the maximum value M, it means that the pig 2 is passing through the straight pipe section between the adjacent bending parts L. Therefore, the position distance S ).

Here, the straight pipe function can be expressed by the following equation (3).

[Equation 3]

Figure 112015094910216-pat00007

(S (t): t time position distance pig in, D n: pipe length of the n-th song tube from the starting point, t n: time when the pig has passed parts of n-th bend, C n: n-1-th track (T): Flow rate at time t, A: Cross-sectional area of pipe, Ⅰ: When the pig moved in the forward direction from the n-1 th bend, Ⅱ: Is moved in the reverse direction from the (n-1) th bending portion)

That is, the distance at which the pig 2 moves through the straight pipe section is obtained by using the flow rate coefficient C n -1 obtained at the immediately preceding bending section (l), and the distance to the bending section (l) It is possible to obtain the current position distance S of the pig 2, and when the pig 2 travels in the reverse direction, it can be obtained in the same manner.

In the data processing step or the data processing unit 7, the above steps may be repeated, and the data on the position distance S and the flow rate utilization coefficient may be stored or transmitted to the output unit 8. [ Thus, the position of the pig 2 can be accurately updated and tracked in real time.

The data processing unit or the data processing unit 7 of the present invention may calculate the velocity of the pig 2 in the straight pipe portion according to Equation 4 using the flow rate coefficient obtained by the above method, Can be utilized to predict the pig (2) position.

[Equation 4]

Figure 112015094910216-pat00008

(v (t): n- 1 -th track tube and the n-th song speeds, C n at t the time of the pig to move between the section tube: n-1 flow rate using coefficient between the second track tube and the n-th song tube section , Q (t): instantaneous flow rate at time t, A: cross-sectional area of piping)

The present invention is not limited to the above-described specific embodiment and description, and various changes and modifications may be made by those skilled in the art without departing from the scope of the present invention as claimed in the claims. And such modifications are within the scope of protection of the present invention.

1: piping 2: pig
3: pump 4:
5: Flow sensor 6: Pressure sensor
7: Data processing unit 8: Output unit
9: Control valve 10: Control part
11: Engine A: Starting point
B: Destination C: Point where the pig is located
S: Position distance ℓ: Tube section
M: maximum value m: extreme value

Claims (11)

delete delete delete delete A method of tracking the position of a pig (2) moving along the interior of a pipe (1) having at least one bend (1) and cleaning or diagnosing the interior of the pipe (1)
Measuring the flow rate and pressure of the pressurized fluid for moving the pig (2) within the pipe (1);
A data processing step of obtaining a positional distance (S) of the pig (2) based on the measured flow rate and pressure; And
And outputting the position of the pig 2 based on the calculated position distance S,
The data processing step may include: obtaining a measured pressure and a flow rate; And
And determining whether the measured pressure is a maximum value (M)
If the measured pressure is the maximum value M,
Calculating a curvature part function based on the length of the pipe 1 from the starting point A of the pig 2 to the curved part 1 to obtain the position distance S of the pig 2, Calculating a flow rate utilization factor correction function based on the flow rate utilization factor; And storing and updating the flow rate utilization factor,
If the measured pressure is not the maximum value M,
Calculating a positional distance (S) of the pig (2) based on the measured flow rate and the stored flow rate utilization coefficient to calculate a position of the pig using the pressure and flow rate of the pressurized fluid Way. delete The method of claim 5,
Wherein the bending part function is expressed by the following equation (1).
[Equation 1]
Figure 112017004424815-pat00009

(S: position distance of the pig, D n : length of piping from the starting point to the nth bend, Ⅰ: when the pig moved in the forward direction from the n-1 th bend, Ⅱ: When moving in the reverse direction) The method of claim 5,
Wherein the flow rate utilization factor correction function is expressed by the following equation (2).
[Equation 2]
Figure 112017004424815-pat00010

(C n: n-1-th track tube and the n-th track the flow rate using the coefficient of the tube between the section, D n: pipe length from the starting point to the n-th track tube, t n: the time over parts of Pigment an n-th bend time, Q: The momentary flow at time t, A: The cross-sectional area of the pipe, I: The pig moved in the forward direction from the n-1 th bend, II: The pig moved in the reverse direction from the n-1 th bend ) The method of claim 8,
Characterized in that the flow utilization coefficient (C 0 ) of the section between the starting point (A) and the first bending section has a value based on the shape of the pig (2). Location tracking method. The method of claim 5,
Wherein the straight pipe section function is expressed by the following equation (3).
[Equation 3]
Figure 112017004424815-pat00011

(S (t): t time position distance pig in, D n: pipe length of the n-th song tube from the starting point, t n: time when the pig has passed parts of n-th bend, C n: n-1-th track (T): Flow rate at time t, A: Cross-sectional area of pipe, Ⅰ: When the pig moved in the forward direction from the n-1 th bend, Ⅱ: Is moved in the reverse direction from the (n-1) th bending portion) The method of claim 5,
The data processing step includes:
Wherein the speed of the pig (2) is additionally calculated according to the following equation (4).
[Equation 4]
Figure 112017004424815-pat00012

(v (t): n- 1 -th track tube and the n-th song speeds, C n at t the time of the pig to move between the section tube: n-1 flow rate using coefficient between the second track tube and the n-th song tube section , Q (t): instantaneous flow rate at time t, A: cross-sectional area of piping)
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