JP2010060515A - Leakage checking device for movable storage tank - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a leakage checking device for a movable storage tank, checking leakage of a movable storage tank by mounting sensor units on hatches partitioned in the movable storage tank, and improved in working efficiency of a worker. <P>SOLUTION: The leakage checking device 1 for a movable storage tank includes: temperature sensors 21a, 21b required for checking leakage in a tank; a pressure sensor 22; a monitor 25 for displaying measured values by the temperature sensors 21a, 21b or the pressure sensor 22; and a pressure port 23 for fitting piping 30, which are integrally provided. Therefore, the worker can easily assemble and carry the leakage checking device 1 for the movable storage tank. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an apparatus for inspecting mobile storage tanks for leaks.

  Conventionally, an example of a mobile storage tank (hereinafter referred to as a mobile storage tank) mounted on a tank truck that conveys oil or the like is shown in FIG. The tank 110 is divided into a plurality of hatches 101 for loading oil. A hatch port 102 serving as a loading port for oils is provided on the upper part of the hatch 101. When the oils are loaded, the inside of the hatch 101 is predetermined. A safety valve mounting portion 103 is provided which is opened when the pressure is reached and a safety valve for releasing oil vapor in the hatch 101 is attached.

  In recent years, there is a potential danger that the hatch 101 of the tank 110 will crack due to an increase in the size of the tank lorry vehicle, a long distance of oil delivery, and the like. Therefore, in order to prevent such accidents, the Fire and Disaster Management Agency has reviewed the inspection method of the tank 100 of the tank lorry vehicle, and some of the regulations concerning the regulation of dangerous goods have been inspected for leakage related to the tank 110. Revised and reviewed related regulations. Along with this, “Guidelines on Operation for Leakage Inspection of Mobile Storage Tank” shown in Non-Patent Document 1 (Notification of Fire Safety Danger No. 33, Fire and Disaster Management Agency, Dangerous Goods Safety Office Director, March 18, 2004) was notified.

  The guideline describes how to check leakage of the tank 110 of the tank lorry vehicle, and a gas pressurization method is defined as a method of checking the tank 110. In this gas pressurization method, in the state where the hatch 101 is emptied, nitrogen gas is sealed in the hatch 101, the test pressure (20 kPa) is maintained, and the pressure fluctuation within a certain time is measured, so that there is no leakage. This is an inspection method to confirm.

  As an apparatus for performing the above-described inspection, there is a “tank lorry vehicle leakage inspection system (Japanese Patent No. 3338072)” disclosed in Patent Document 1. In this tank lorry vehicle leakage inspection system 100, as shown in FIG. 7, a temperature sensor cable 120 having a temperature sensor (not shown) at the tip and a pressure sensor having a pressure sensor (not shown) at the tip. A cable 121 is attached so as to close the safety valve mounting portion 103, and data detected by the temperature sensor cable 120 and the pressure sensor cable 121 is transmitted to the control device 140 through the temperature sensor cable 120 and the pressure sensor cable 121. Sent to.

  Further, a piping 130 for supplying nitrogen gas into the hatch 101 is attached to the safety valve mounting location 103 so as to close the safety valve mounting location 103, and the hatch 101 is pressurized in the middle of each piping 130. A pressure adjusting valve 131 for adjusting the pressure is provided. Further, a distributor 132 is disposed on the upstream side of each pipe. The distributor 132 is connected to an on-off valve 133 for supplying and shutting off nitrogen gas, a hose 134 for supplying nitrogen gas, and a distributor 132. A nitrogen cylinder gas 136 is connected via a pressure adjusting device 135 that adjusts the pressure of the nitrogen gas to be supplied. In addition, a keyboard 141 for inputting various data, a display 142 for displaying various monitor screens at the time of inspection, and a printer 143 for printing out inspection execution data are connected to the control device 140.

Japanese Patent No. 3333872 "Operational guidelines for leak inspection of mobile storage tanks"

  However, since the temperature sensor cable 120 and the pressure sensor cable 121 are separate in the tank lorry vehicle leakage inspection system 100, the conveyance and installation work efficiency is lowered, and the occurrence of poor bonding is caused. In addition, when a check operation for confirming whether the temperature sensor cable 120, the pressure sensor cable 121, and the pipe 130 are correctly attached to the safety valve mounting portion 103 occurs, the operator refers to the pressure value displayed on the display 142. Then, the correctness of the wearing is judged. In this case, since the worker needs to repeatedly move up and down to the tank 110, the work efficiency is lowered.

  The mobile storage tank leakage inspection device of the present invention is attached to a sensor unit that is attached to a plurality of hatch attachment ports divided in the mobile storage tank and can detect the pressure and temperature inside the hatch, and is arranged in the sensor unit. A pipe for injecting fluid into the hatch, an on-off valve interposed on the path of the pipe, and a command signal is issued to the sensor unit to control the sensor unit in response to the command and to the sensor unit. A mobile storage tank leakage inspection device comprising a control unit that receives detection data and that opens and closes the on-off valve as needed. The sensor unit includes a temperature sensor, a pressure sensor, and the temperature sensor or The monitor that displays the measured value by the pressure sensor and the pressurization port to which the pipe is attached are equipped as a single unit. And features.

  Further, the sensor unit is provided with a decompression port for decompressing the inside of the hatch, while the control unit operates the decompression port as needed.

  Furthermore, the plurality of sensor units are connected in a daisy chain manner.

  In the present invention, since the sensor unit is provided with a temperature sensor, a pressure sensor, and a monitor for displaying a measurement value by the temperature sensor or the pressure sensor, which are necessary for the leakage inspection, the assembly work of the inspection apparatus In addition, the conveyance efficiency is improved. Further, as compared with a device in which the temperature sensor, the pressure sensor, and the monitor are separate from each other, the assembly failure of the part (for example, poor connection) does not occur, and therefore, no fluid leaks from the defective portion.

  In addition, since a pressure reducing port that operates in response to a command from the control unit is provided, a plurality of hatches can be depressurized at the same time without the operator manually performing valve opening work or the like.

  In addition, since the plurality of sensor units are connected in a daisy chain system, it is not necessary to add an input terminal for connecting the sensor unit to the control unit when the sensor unit is added.

  In addition, since the sensor unit is connected in the daisy chain method, the sensor unit can be easily added without adding a terminal for connecting the sensor unit to the control unit.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes a mobile storage tank leakage inspection device that inspects leakage of a mobile storage tank 10 (hereinafter, this mobile storage tank is referred to as a tank) mounted on a tank truck that conveys oil and the like. The tank 10 is divided into a plurality of hatches 11 for loading oil. A hatch port 12 serving as a loading port for oils is provided on the top of the hatch 11 and the inside of the hatch 11 is predetermined when loading the oils. A safety valve mounting portion 13 is provided which is opened when the pressure is reached and a safety valve for releasing oil vapor in the hatch 11 is attached.

  The mobile storage tank leakage inspection device 1 is mounted so as to close the safety valve attachment points 13 of the plurality of hatches 12 and detects a temperature and pressure in the hatches 11, and the sensor unit 20. And a pipe 30 for injecting nitrogen gas into the hatch 12, and an on-off valve according to the claims, and the supply of the nitrogen gas interposed on the path of the pipe 30 and An energy-saving valve 40 that shuts off, and a control unit 50 that issues various command signals to the sensor unit 20 and the energy-saving valve 40 and receives detection data from the sensor unit 20 are provided.

  In the leak inspection using the mobile storage tank leak inspection apparatus 1, nitrogen gas flows into the plurality of hatches 11 from the nitrogen gas bonnet 90 disposed in the uppermost stream of the pipe 30 and is pressurized to a test pressure (20 kPa). A pressurizing step, a standing step in which the hatch 11 is allowed to stand for 20 minutes in the state of the test pressure, a temperature and pressure in the hatch 11 at the end of the standing step, and after 40 minutes from the end of the standing step A measurement process for measuring the temperature and pressure in the hatch 11, a determination process for determining the presence or absence of leakage in the hatch 11 based on these measurement values, and a depressurization process for depressurizing the hatch 11 after the determination is completed. Is called.

  As shown in FIG. 2, the sensor unit 20 includes a first temperature sensor 21 a that detects the temperature of the upper layer in the hatch 11 and a second temperature sensor that detects the temperature of the lower layer in the hatch 11. 21b, a pressure sensor 22 for detecting the pressure in the hatch 11, a pressurizing port 23 to which the pipe 30 is connected, a decompression port 24 for discharging nitrogen gas sealed in the hatch 11, and the hatch 11 is provided with a digital monitor 25 for digitally displaying the pressure and temperature in the terminal 11, an input terminal 26 to which a connection cable 80, which will be described in detail later, and an output terminal 27 are connected. The decompression port 24 has a built-in solenoid valve (not shown) that opens and closes in response to a command from the control unit 50, and the amount of nitrogen gas discharged from the decompression port 24 can be freely adjusted. It is configured.

  The control unit 50 displays the detection data from the sensor unit 20 on the touch panel 62 and accumulates the detection data. When the operator operates the touch panel 62, various work commands are input. And a slave unit 70 that issues a command signal to the sensor unit 20 and the energy saving valve 40 based on various commands from the master unit 60. The master unit 60 and the slave unit 70 are provided with wireless antennas 61 and 71, respectively. The master unit 60 and the slave unit 70 are configured to wirelessly transmit various command signals and detection data. .

  Further, as shown in FIG. 2, the sensor unit 20 includes an input side terminal 26 and an output side terminal 27, and the slave unit 70 of the control unit 50 and the input side terminal 26 of one sensor unit 20 Are connected by a connection cable 80. The output side terminal 27 of the sensor unit 20 and the input side terminal 26 of another sensor unit are also connected by a connection cable 80, that is, the plurality of sensor units 20 are connected by the connection cable 80 by a daisy chain method. Yes. This daisy chain method is a connection method in which a plurality of peripheral devices are generally connected in a daisy chain. In the mobile storage tank leakage inspection apparatus 1 of the present invention, one sensor unit 20 is connected by an individual connection cable 80. In this connection configuration, the plurality of sensor units 20 are connected by the connection cable 80 one after another in a daisy chain manner. And the said subunit | mobile_unit 70 is connected to one sensor unit 20 among these several sensor units 20, and a command signal is sent to all the sensor units 20. FIG. With this configuration, the sensor unit 20 can be easily added.

  FIG. 3 shows the connection between the slave unit 70 of the control unit 50 and one of the sensor units 20 and the connection concept of the other sensor units 20. In FIG. 3, for convenience of explanation, the connection cable 80 that connects the slave unit 70 and one sensor unit 25 and the individual connection cables 80 that connect each sensor unit 20 are referred to as one connection cable 80. Represents. As shown in FIG. 3, the slave unit 70 of the control unit 50 incorporates an overall module 79 that controls the sensor unit 20 collectively. On the other hand, the sensor unit 20 has a built-in sub-module 29 that receives various command signals from the overall module 79 or transmits a test data return request from the overall module 79. Specifically, the sub-module 29 is connected to the first temperature sensor 21a, the second temperature sensor 21b, the pressure sensor 22, and the decompression port 25, which are components of the sensor unit 20, from the overall module 79. A command signal for the component is generated. On the other hand, when there is a request for returning inspection data from the overall module 79, detection data from the first temperature sensor 21a, the second temperature sensor 21b, and the pressure sensor 22 are returned to the overall module 79 via the submodule 29. .

  As shown in FIGS. 1 and 5, the pipe 30 extends from a nitrogen gas cylinder 90 as a gas supply source via a regulator 45. Further, the pipe 30 is branched downstream from the regulator 45 so as to correspond to the number of the sensor units 20, and is disposed in the sensor unit 20 via the energy saving valve 40. The regulator 45 reduces and stabilizes the pressure in the pipe 30 through which the fluid flows, and the pressure in the pipe 30 is 100 kPa to 200 ka upstream from the regulator, but downstream from the regulator. Then, the pressure in the pipe 30 is 30 kPa to 50 kPa, which is close to the test pressure.

  As shown in FIG. 5, the energy saving valve 40 is an operation valve 41 and an air-driven control valve that controls the operation and non-operation of the operation valve 41 and supplies and shuts off the fluid flowing through the operation valve 41. 42. The operation valve 41 is interposed on a pipe 30 route branched into a plurality on the downstream side of the regulator 45. On the other hand, the control valve 42 is provided with a plurality of pipes 30 branched upstream from the regulator 45, and the control valve 42 is connected to a nitrogen gas cylinder 90 disposed in the uppermost stream of the pipe 30. It is comprised so that it may drive with the nitrogen gas which flows out. Further, the control valve 42 is connected to the slave unit 70 of the control unit 50 by a connection cable 80 and operates based on a command signal from the slave unit 70.

  The connection cable 80 includes two power lines (not shown) and two communication lines. The communication lines include a transmission communication line 81 and a reception line as shown in FIG. And a communication line 82. With this configuration, various signals are transmitted and received between the slave unit 70 and each sensor unit 50 of the control unit 50 and the slave unit 70 and the energy saving valve 40. The slave unit 70 of the control unit 50 is connected with a DC battery battery 72 as a power source as a power source, and power is supplied to the energy saving valve 40 and the sensor unit 20 through a connection cable 80.

  Hereinafter, the flow of inspection work using the mobile storage tank leakage inspection apparatus of the present invention will be described with reference to the chart shown in FIG. The leak inspection of the tank 10 is performed in the order of a pressurization process, a stationary process, a measurement process, a determination process, and a decompression process.

  In the pressurization process, the operator operates the touch panel 62 of the master unit 60 of the control unit 50 to wirelessly transmit a pressurization start command signal from the master unit 60 to the slave unit 70 (step S1). When the handset 70 receives this pressurization command signal, the handset 70 issues an opening command signal to the control valve 42 of the energy saving valve 40 to open the operation valve 41 (step S2). As a result, nitrogen gas flows into the hatch 11 until all of the hatches 11 reach the test pressure evenly. Thereafter, when the inside of the hatch 11 reaches the test pressure (step S3), a closing command signal is issued to the control valve 42 to close the operating valve 41 (step S4). Here, the pressurizing step is finished, and the process proceeds to the next standing step.

  In the standing step, a standing time of 20 minutes is set after the end of pressurization (step S5). And when stationary for 20 minutes is complete | finished, it transfers to the following measurement process.

In the measurement step, the pressure (P ₂₀ ) at the end of the standing step, the temperature of the upper layer portion of the hatch 11 and the average temperature (T ₂₀ ) at the end of the standing step are measured (step S6), and The pressure (P ₆₀ ) 40 minutes after the end of the stationary process, the temperature of the upper layer of the hatch 11 and the average temperature (T ₆₀ ) of the lower layer are measured (step S7), and the temperature correction pressure is based on the following calculation formula: A descending amount (ΔP ₄₀ ) is calculated (step S8). And it transfers to the determination process which determines the test result in the hatch 11 based on this result.

In the determination step, when the ΔP ₄₀ is 0.20 kPa or less (step S9: YES), “no abnormality” is displayed on the touch panel 62 (step S10), and the process proceeds to the pressure reduction step (step 14). Further, when the ΔP ₄₀ exceeds 0.20 kPa (step S9: NO) and is 0.40 kPa or less (step S11: YES), “retest” is displayed on the touch panel 62 (step S12), and the pressure reducing process. (Step S14). Furthermore, when the ΔP40 exceeds 0.40 kPa (step S11: NO), “abnormal” is displayed on the touch panel 62 (step S13), and the process proceeds to the pressure reducing process (step S14).

  In the decompression step, when a decompression command signal is issued from the master unit 60 of the control unit 50 through the slave unit 70, the decompression port 24 of the sensor unit 20 is opened, and the nitrogen gas in the hatch 11 is exhausted. The inside is depressurized. At this time, the control unit 50 monitors the pressure values in all the hatches 11 and controls the electromagnetic valves built in the decompression port 24 so that all the hatches 11 are uniformly decompressed. This completes the leakage inspection.

  Hereinafter, the operation and effect of the mobile storage tank leakage inspection apparatus 1 of the present invention will be described. In the mobile storage tank leakage inspection apparatus 1 of the present invention, each sensor unit 20 is connected in a daisy chain manner. Therefore, when the sensor unit 20 is added, it is not particularly necessary to add a terminal or the like for connecting the sensor unit 20 to the slave unit 70 of the control unit 50. Therefore, the sensor unit 20 can be easily added.

  Since the master unit 60 and the slave unit 70 of the control unit 50 transmit the command signal to the sensor unit 20 and receive the detection data by the sensor unit 20 by wireless transmission, the operator sends the command at an arbitrary place. be able to. In addition, when a joint failure occurs in the piping 30 or the like, the operator carries the master unit 60 to the joint failure location and moves to check the joint failure while referring to the detection data displayed on the master unit 60. Can be done.

  The control unit 50 is configured to control the control valve 42 of the energy saving valve 40 to open the operation valve 41 during the pressurization process, and to control the decompression port 24 to depressurize the hatch 11 during the decompression process. ing. This eliminates the need for the operator to manually open and close the valve. In addition, the control unit 50 controls the opening and closing of the plurality of energy saving valves 40 during the pressurization process to pressurize the plurality of hatches 11 uniformly, while controlling the opening and closing of the plurality of decompression ports 24 during the decompression process. It is also possible to decompress the plurality of hatches 11 evenly. By this uniform pressurization and uniform depressurization, there is no pressure difference between the adjacent hatches 11, and there is no occurrence of cracks in the walls forming the hatches 11.

  The control valve 42 of the energy saving valve 40 is connected to a pipe 30 branched upstream from the operation valve 41, and the control valve is configured to be driven by a gas flowing through the pipe 30. Therefore, it is not necessary to provide a separate drive source for driving the control valve 41.

  The sensor unit 20 is provided with a temperature sensor 21a, 21b, a pressure sensor 22, and a monitor 25 for displaying a measurement value obtained by the temperature sensor 21a, 21b or the pressure sensor 22, which are necessary for a leak test. As a result, the assembly work of the inspection apparatus and the efficiency of conveyance are improved. In addition, this integrated configuration does not cause defective bonding of the temperature sensors 21a and 21b, the pressure sensor 22, and the monitor 25, and can prevent leakage of nitrogen gas from the defective bonding portion.

  Hereinafter, another embodiment of the present invention will be described with reference to FIG. The mobile storage tank leak inspection apparatus 1 ′ shown in FIG. 6 connects the slave unit 70 of the control unit 50, the connection cable 80 connected to the sensor unit 20, and each sensor unit 20 in the mobile storage tank leak inspection apparatus 1 described above. The sensor unit 20 is equipped with a wireless antenna 20a capable of wireless communication with the slave unit 70, instead of the connection cables 80. The slave unit 70 and the master unit 80 can individually control the plurality of sensor units 20. With this configuration, the connection cable 80 is not required for the connection of the sensor unit 20, so that assembly work and the addition of the sensor unit 20 are easy.

It is a figure which shows the structure of this invention. It is a figure which shows the structure of a sensor unit. It is a conceptual diagram which shows the connection method of each sensor unit. It is a flowchart figure of the leakage inspection using this invention. It is a simplified diagram showing the configuration of the present invention. It is a figure which shows the other Example of this invention. It is a figure which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mobile storage tank leak test | inspection apparatus 10 Mobile storage tank 11 Hatch 12 Hatch port 13 Safety valve attachment location 20 Sensor unit 20a Wireless antenna 21a First temperature sensor 21b Second temperature sensor 22 Pressure sensor 23 Pressurization port 24 Decompression port 25 Digital Monitor 26 Input side terminal 27 Output side terminal 29 Sub module 30 Piping 40 Energy saving valve 41 Actuating valve 42 Control valve 45 Regulator 50 Control unit 60 Master unit 61 Wireless antenna 62 Touch panel 70 Slave unit 71 Wireless antenna 72 Battery 79 General module 80 Connection cable 81 Transmission communication line 82 Reception communication line 90 Nitrogen gas cylinder

100 Tank Lorry Car Leakage Inspection System 101 Hatch 102 Hatch Port 103 Safety Valve Attached Point 110 Tank 120 Temperature Sensor Cable 121 Pressure Sensor Cable 130 Pipe 131 Pressure Adjustment Valve 132 Distributor 133 On-off Valve 134 Hose 135 Pressure Adjustment Device 136 Nitrogen Gas Cylinder 140 Control Device 141 Keyboard 142 Display 143 Printer

Claims (3)

A sensor unit that is attached to a plurality of hatch attachment ports in the mobile storage tank and that can detect the pressure and temperature inside the hatch, and a pipe that is disposed in the sensor unit and injects fluid into the hatch. An on-off valve interposed on the piping path, and a command signal is issued to the sensor unit to control the sensor unit in response to the command and receive detection data from the sensor unit, while the on-off valve A mobile storage tank leakage inspection device comprising a control unit that opens and closes as necessary,
The sensor unit is integrally provided with a temperature sensor, a pressure sensor, a monitor for displaying a measured value by the temperature sensor or the pressure sensor, and a pressurizing port to which the pipe is attached. Mobile storage tank leak inspection device.   2. The mobile storage tank leakage inspection apparatus according to claim 1, wherein the sensor unit is provided with a pressure reducing port for reducing the pressure inside the hatch, while the control unit operates the pressure reducing port as required. .   The mobile storage tank leakage inspection device according to claim 1 or 2, wherein the plurality of sensor units are connected in a daisy chain manner.

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