A remote monitoring system and method for pressure vessel and pressure test thereof

Abstract

The present invention discloses a remote monitoring system and method for a pressure vessel and its pressure test. The system includes: a temperature sensor, a pressure sensor, a data acquisition module, and a local industrial computer; the temperature sensor and the pressure sensor are arranged on the pressure vessel; the temperature sensor and the pressure sensor are respectively connected to the data acquisition module; the local industrial computer is connected to the data acquisition module; the temperature sensor and the pressure sensor respectively collect temperature information and pressure data during the pressure test and send the temperature information and pressure data to the data acquisition module; the data acquisition module sends the temperature information and pressure data to the local industrial computer. The present invention uses the local industrial computer to judge whether the pressure vessel is qualified according to the temperature information and pressure data, solves the problem that the pressure of the pressure vessel is easily misjudged and misjudged when the traditional naked eye observation method is used to check the pressure of the pressure vessel, and causes a large workload for special inspection personnel, and has the characteristics of high detection accuracy and high efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of pressure monitoring of pressure vessels, and in particular to a remote monitoring system and method for a pressure vessel and a pressure test thereof. Background Art

[0002] Each pressure vessel needs to undergo a pressure test before leaving the factory. The purpose of the pressure test is to test the strength and tightness of the pressure-bearing parts of the pressure vessel. During the test, by observing whether the pressure-bearing parts have obvious deformation or rupture, it is verified whether the pressure vessel has the necessary pressure-bearing strength for safe operation under the design pressure. At the same time, by observing whether there is leakage at the welds, flanges and other joints, the tightness of the pressure vessel is tested.

[0003] It can be seen that the traditional naked eye observation method requires special inspectors to be present on site for supervision and observe whether there is a pressure drop in the pressure vessel during the test and pressure maintenance period. However, when using naked eye observation, it is strongly influenced by the subjective consciousness of the special inspectors, making it easy for the inspection of pressure vessels to be misjudged and misjudged, and also greatly increasing the workload of special inspectors. Summary of the invention

[0004] The purpose of the present invention is to provide a remote monitoring system and method for a pressure vessel and its pressure test, so as to solve the problem that when the pressure of the pressure vessel is inspected by the traditional naked eye observation method, it is easy to make a wrong judgment and misjudgment, which leads to a heavy workload for special inspectors.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] A remote monitoring system for a pressure vessel and its pressure test, comprising: a temperature sensor, a pressure sensor, a data acquisition module, and a local industrial computer;

[0007] The temperature sensor and the pressure sensor are arranged on the pressure vessel; the temperature sensor and the pressure sensor are connected to the data acquisition module respectively; the local industrial computer is connected to the data acquisition module;

[0008] The temperature sensor and the pressure sensor respectively collect temperature information and pressure data during the pressure test and pressure maintenance period, and send the temperature information and pressure data to the data acquisition module;

[0009] The data acquisition module sends the temperature information and the pressure data to the local industrial computer.

[0010] Optionally, the system further includes: an RFID tag, a handheld antenna and an RFID reader / writer; the RFID tag is arranged on a supporting leg of the pressure vessel; and the RFID reader / writer is respectively connected to the handheld antenna and the local industrial computer.

[0011] Optionally, the system also includes: a video camera; the video camera is connected to the local industrial computer; the video camera is used to capture image data of the pressure test site and transmit the image data to the local industrial computer; the local industrial computer stores the image data in a local database.

[0012] Optionally, the data acquisition module includes: a single-chip microcomputer, an analog-to-digital conversion module and a power supply module; the single-chip microcomputer is respectively connected to the analog-to-digital conversion module, the power supply module and the local industrial computer; the temperature sensor and the pressure sensor are respectively connected to the analog-to-digital conversion module; the temperature information and the pressure data are converted into digital form by the analog-to-digital conversion module and then sent to the local industrial computer via the single-chip microcomputer.

[0013] A remote monitoring method for a pressure vessel and a pressure test thereof, the method comprising:

[0014] Obtain pressure data collected by the pressure sensor during the pressure test;

[0015] Calculate a process average and an average range based on the pressure data;

[0016] Establish a process mean control chart and a range control chart according to the process mean and the mean range;

[0017] Whether the pressure vessel is qualified is determined based on the process mean value control chart and the range control chart.

[0018] Optionally, the calculating the process average and the average range according to the pressure data specifically includes:

[0019] Dividing the pressure data into M subgroups according to the holding time, each subgroup includes N data;

[0020] Using formula Calculate the mean for each subgroup; where X ij is the jth data in the i-th subgroup, is the mean of the ith subgroup; N is the number of data in the subgroup;

[0021] Using formula R i =X i中最大值 -X i中最小值 Calculate the range of each subgroup; where R i is the range of the ith subgroup, X i中最大值 is the maximum value in the i-th subgroup, X i中最小值 is the minimum value in the i-th subgroup;

[0022] Based on the mean of each subgroup Using formula Calculate the process average Where M is the number of subgroups;

[0023] According to the range R of each subgroup i , using the formula Calculate the average range

[0024] Optionally, establishing a process mean control chart and a range control chart according to the process mean and the mean range specifically includes:

[0025] A process mean control chart is established according to the process mean and the average range; the process mean control chart includes a center line, an upper control limit and a lower control limit; the center line of the process mean control chart is the process mean

[0026] According to the process average and the average range Using formula Determine the upper control limit for the process mean control chart Where A2 is the measurement value control chart coefficient;

[0027] According to the process average and the average range Using formula Determine the lower control limit of the process mean control chart

[0028] A range control chart is established based on the average range; the range control chart includes a center line, an upper control limit, and a lower control limit; the center line of the range control chart is the average range

[0029] According to the average range Using formula Determine the upper control limit UCL of the range control chart R ; Where D4 is the measurement value control chart coefficient;

[0030] According to the average range Using formula Determine the lower control limit LCL of the range control chart R ; Where D3 is the measurement value control chart coefficient.

[0031] Optionally, judging whether the pressure vessel is qualified according to the process mean value control chart and the range control chart specifically includes:

[0032] Determine whether the pressure holding time during the pressure test is equal to or greater than a preset time, and generate a first determination result;

[0033] If the first judgment result is that the pressure holding time is equal to the preset time, a first mean value and a first range value are calculated according to the pressure data and a first process mean value control chart and a first range control chart are established;

[0034] According to the positions of the first mean and the first range in the first process mean value control chart and the first range control chart respectively, judging whether the pressure test is qualified, and generating a second judgment result;

[0035] If the second judgment result is that the pressure test is qualified, then the pressure vessel is determined to be qualified;

[0036] If the second judgment result is that the pressure test is unqualified, then the pressure vessel is determined to be unqualified;

[0037] If the first judgment result is that the pressure holding time is greater than the preset time, extracting the standard pressure data before the preset time during the pressure holding period;

[0038] Calculate the standard mean and standard range according to the standard pressure data and establish a second process mean value control chart and a second range control chart;

[0039] According to the positions of the standard mean and the standard range in the second process mean value control chart and the second range control chart respectively, judging whether the pressure test is qualified, and generating a third judgment result;

[0040] If the third judgment result is that the pressure test is unqualified, then determining that the pressure vessel is unqualified;

[0041] If the third judgment result is that the pressure test is qualified, extracting the current pressure data after the preset time during the pressure holding period, and calculating the current mean and current range of the current pressure data;

[0042] According to the positions of the current mean and the current range in the second process mean value control chart and the second range control chart respectively, judging whether the pressure test is qualified, and generating a fourth judgment result;

[0043] If the fourth judgment result is that the pressure test is qualified, then the pressure vessel is determined to be qualified;

[0044] If the fourth judgment result is that the pressure test fails, it is determined that the pressure vessel fails.

[0045] Optionally, the determining whether the pressure holding time during the pressure test is equal to or greater than a preset time further includes:

[0046] Calculating an average value of the pressure data;

[0047] determining whether the average value of the pressure data is within a preset pressure range, and generating a fifth determination result;

[0048] If the fifth judgment result is that the average value of the pressure data is not within the preset pressure range, the pressure test is unqualified, and the pressure vessel is determined to be unqualified;

[0049] If the fifth judgment result is that the average value of the pressure data is within the preset pressure range, the step of judging whether the pressure holding time during the pressure test is equal to or greater than the preset time is performed.

[0050] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0051] The present invention discloses a remote monitoring system and method for a pressure vessel and its pressure test, the system comprising: a temperature sensor, a pressure sensor, a data acquisition module, and a local industrial computer; the temperature sensor and the pressure sensor are arranged on the pressure vessel; the temperature sensor and the pressure sensor are respectively connected to the data acquisition module; the local industrial computer is connected to the data acquisition module; the temperature sensor and the pressure sensor respectively collect temperature information and pressure data during the pressure test, and send the temperature information and pressure data to the data acquisition module; the data acquisition module sends the temperature information and the pressure data to the local industrial computer. The present invention uses the local industrial computer to judge whether the pressure vessel and its pressure test are qualified according to the temperature information and the pressure data, solves the problem that the pressure of the pressure vessel is easily misjudged and misjudged when the traditional naked eye observation method is used to check the pressure of the pressure vessel, and causes a large workload for special inspection personnel, and has the characteristics of high detection accuracy and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0053] Figure 1 A schematic diagram of the structure of a remote monitoring system for a pressure vessel and a pressure test thereof provided by the present invention;

[0054] Figure 2 A schematic diagram of the pressure detection principle of the pressure vessel provided by the present invention;

[0055] Figure 3A pressure detection flow chart of the pressure vessel provided by the present invention.

[0056] Explanation of symbols:

[0057] 1RFID tag, 2handheld antenna, 3RFID reader / writer, 4temperature sensor, 5pressure sensor, 6data acquisition module, 7local industrial computer, 8video camera, 9cloud server, 10remote App. DETAILED DESCRIPTION

[0058] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0059] The purpose of the present invention is to provide a remote monitoring system and method for a pressure vessel and its pressure test, so as to solve the problem that when the pressure of the pressure vessel is inspected by the traditional naked eye observation method, it is easy to make a wrong judgment and misjudgment, which leads to a heavy workload for special inspectors.

[0060] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0061] Figure 1 The schematic diagram of the structure of the remote monitoring system for the pressure vessel and its pressure test provided by the present invention. Figure 1 As shown, a remote monitoring system for a pressure vessel and a pressure test thereof includes: a temperature sensor 4, a pressure sensor 5, a data acquisition module 6, and a local industrial computer 7.

[0062] The temperature sensor 4 and the pressure sensor 5 are arranged on the pressure vessel; the temperature sensor 4 and the pressure sensor 5 are respectively connected to the data acquisition module 6; the local industrial computer 7 is connected to the data acquisition module 6. In the embodiment of the present invention, the temperature sensor 4 is preferably a PT100 temperature sensor, and the pressure sensor 5 is preferably a 2088 pressure transmitter.

[0063] The temperature sensor 4 and the pressure sensor 5 respectively collect temperature information and pressure data during the pressure test and pressure maintenance period, and send the temperature information and pressure data to the data acquisition module 6 .

[0064] The data acquisition module 6 sends the temperature information and the pressure data to the local industrial computer 7; the local industrial computer 7 includes a local database; the local industrial computer 7 determines whether the pressure vessel is qualified based on the temperature information and the pressure data, and generates a judgment result; the local database is used to store the temperature information, the pressure data and the judgment result.

[0065] The system also includes: an RFID tag 1, a handheld antenna 2, and an RFID reader / writer 3. The RFID tag 1 is set on the support foot of the pressure vessel; the RFID reader / writer 3 is connected to the handheld antenna 2 and the local industrial computer 7 respectively. Specifically, the RFID tag 1 is embedded in the support foot position of the pressure vessel with an anti-metal property design, the pressure sensor 5 and the temperature controller 4 are placed on the pressure vessel and connected to the data acquisition module 6, and the data acquisition module 6 establishes communication with the local industrial computer 7 through the serial port. The video camera 8 and the RFID reader / writer 3 are directly connected to the local industrial computer 7, the local database in the local industrial computer 7 and the cloud database of the cloud server 9 establish a synchronization relationship, the remote end App 10 is connected to the cloud server 9, and the RFID reader / writer 3 and the handheld antenna 2 are used to complete the reading and writing of the RFID tag 1. The RFID tag 1 is an anti-metal tag, which can eliminate the interference of metal on the reading and writing of the RFID tag 1, and realize stable reading and writing in metal and humid environments. The preferred RFID reader / writer 3 of the present invention is an impinj revolutionr420 fixed RFID UHF reader / writer.

[0066] The local industrial computer 7 stores the basic information of the pressure vessel and the basic information of the pressure test in the local database, and writes them into the RFID tag 1 through the transmission of the handheld antenna 2 by the RFID reader 3. The basic information of the pressure test includes: test time, test personnel, the pressure data, the temperature information, the pressure holding time and the judgment result; the basic information of the pressure vessel includes: 1. Product name, 2. Manufacturer name, 3. Manufacturer license number\level, 4. Product standard, 5. Main material, 6. Medium name, 7. Design temperature, 8. Design pressure or maximum allowable working pressure (if necessary), 9. Pressure test pressure, 10. Product number, 11. Equipment code, 12. Manufacturing date, 13. Pressure vessel category, 14. Volume (heat exchange area).

[0067] The video camera 8 is used to capture image data of the pressure test site and transmit the image data to the local industrial computer 7; the local industrial computer 7 stores the image data in a local database. Specifically, the video camera 8 is directly connected to the local industrial computer 7. When the pressure test starts, video monitoring is turned on. The local industrial computer 7 processes each frame of the acquired image and converts it into a string by Base64 encoding and saves it in the local database. The local database synchronizes data to the cloud server 9. When the cloud server 9 pushes a message that a pressure test is being conducted to the remote end, the remote end obtains the Base64-encoded string from the cloud server 9, decodes the string and restores it into an image of each frame, and displays it on the remote end, thereby achieving the purpose of video monitoring.

[0068] The local industrial computer 7 stores the temperature information, pressure data and video information collected from the data acquisition module 6 in a local database. The local database is synchronized with the database arranged on the cloud server 9. When the local database is updated, the cloud database is also updated synchronously.

[0069] The data acquisition module 6 includes a single-chip microcomputer, an analog-to-digital conversion module and a power module. The single-chip microcomputer is connected to the analog-to-digital conversion module, the power module and the local industrial computer 7 respectively; the temperature sensor 4 and the pressure sensor 5 are connected to the analog-to-digital conversion module respectively; the temperature information and the pressure data are converted by the analog-to-digital conversion module and then sent to the local industrial computer 7 through the serial port by the single-chip microcomputer. The pressure data is mainly used for the qualification judgment of the pressure test, and the temperature information is used to monitor whether the water temperature meets the requirements of the pressure test during the pressure test.

[0070] The remote end is a mobile phone App, which has login and registration functions, real-time data viewing functions, historical data browsing functions and pressure test query and tracing functions. After ordinary users register, they only have the pressure test query and tracing function. By entering the pressure vessel number or the ID of the RFID tag 1, they can query the basic information of the pressure vessel and the relevant information of the pressure test. The basic information of the pressure test includes the test time, test personnel, test pressure, medium temperature, pressure holding time and test results. After special inspection personnel register and log in, they have the real-time data viewing function, historical data browsing function and pressure test query and tracing function. When the cloud server 9 pushes a message that a pressure test is being conducted to App10, App10 obtains the real-time data updated by the cloud server 9, that is, the temperature, pressure and the encoded video image data, and displays the temperature and pressure data in the form of a line chart. After decoding, the string information is restored to each frame of the image for dynamic display, so as to achieve the purpose of real-time data viewing and remote monitoring. The historical data browsing function is that the App obtains the historical pressure test data saved in the cloud server 9. The pressure test query and tracing function of special inspection personnel is the same as that of ordinary users.

[0071] The working process of the system of the present invention is as follows: when the pressure vessel is cast, an RFID tag 1 is embedded in the pressure vessel, the basic information of the pressure vessel is written into the RFID tag 1, and the ID of the RFID tag 1 and the basic information of the pressure vessel are associated and written into the local database of the local industrial computer 7. Before the pressure test begins, the tester writes the pressure test information into the local database in the local industrial computer 7, and writes the information into the RFID tag 1. When the pressure vessel is subjected to the pressure test, the temperature sensor 4 and the pressure sensor 5 in the data acquisition module 6 collect the temperature and pressure data in the pressure test of the pressure vessel, and the temperature and pressure data are uploaded to the local industrial computer 7 through the serial port through the acquisition module 6. The video camera 8 is responsible for shooting the pressure test site and transmitting the image data to the local industrial computer 7, and the local industrial computer 7 writes the image data into the local database. When the pressure test is completed, the local industrial computer 7 uses the mean range control chart method to determine whether the pressure test is qualified, and writes the judgment result into the RFID tag 1 and the local database. Since the local database and the cloud database in the cloud server 9 are in a synchronous relationship, the relevant information is also written into the cloud database in real time. When the cloud server 9 detects that pressure test data is written into the cloud database, it automatically pushes a pressure test message to the remote end, which can then view the real-time temperature and pressure data of the pressure test and remotely monitor the entire process of the pressure test through on-site video.

[0072] Figure 2 This is a schematic diagram of the pressure detection principle of the pressure vessel provided by the present invention. Figure 3 The pressure detection flow chart of the pressure vessel provided by the present invention. Figure 2 , 3 As shown, based on the remote monitoring system for the pressure vessel and the pressure test thereof, the present invention also provides a remote monitoring method for the pressure vessel and the pressure test thereof. The remote monitoring method determines whether the pressure test is qualified by the mean range control chart method. The specific steps are as follows:

[0073] The temperature information collected by the temperature sensor 4 during the pressure test is obtained, and the temperature of the pressure test is preferably controlled at 20 degrees Celsius.

[0074] Step 1: Obtain the pressure data collected by the pressure sensor during the pressure test.

[0075] Step 2: Calculate the process mean and average range based on the pressure data.

[0076] The step 2 specifically includes:

[0077] Step 201: Divide the pressure data into M subgroups according to the pressure holding time, and each subgroup includes N data.

[0078] Step 202: Use the formula Calculate the mean for each subgroup; where X ij is the jth data in the i-th subgroup, is the mean of the i-th subgroup; N is the number of data in the subgroup; 1≤i≤M, 1≤j≤N.

[0079] Step 203: Use formula R i =X i中最大值 -X i中最小值 Calculate the range of each subgroup; where R i is the range of the ith subgroup, X i中最大值 is the maximum value in the i-th subgroup, X i中最小值 is the minimum value in the i-th subgroup.

[0080] Step 204: Based on the mean of each subgroup Using formula Calculate the process average Where M is the number of subgroups.

[0081] Step 205: According to the range R of each subgroup i , using the formula Calculate the average range

[0082] Step 3: Establish a process mean control chart and a range control chart based on the process mean and the mean range.

[0083] The step 3 specifically includes:

[0084] Step 301: Establish a process mean control chart based on the process mean and the average range; the process mean control chart includes a center line, an upper control limit and a lower control limit; the center line of the process mean control chart is the process mean

[0085] Step 302: According to the process average and the average range Using formula Determine the upper control limit for the process mean control chart Where A2 is the measurement value control chart coefficient;

[0086] Step 303: According to the process average and the average range Using formula Determine the lower control limit of the process mean control chart

[0087] Step 304: Establish a range control chart based on the average range; the range control chart includes a center line, an upper control limit, and a lower control limit; the center line of the range control chart is the average range.

[0088] Step 305: According to the average range Using formula Determine the upper control limit UCL of the range control chart R ; Where D4 is the measurement value control chart coefficient;

[0089] Step 306: According to the average range Using formula Determine the lower control limit LCL of the range control chart R ; Where D3 is the measurement value control chart coefficient.

[0090] Step 4: Determine whether the pressure vessel is qualified based on the process mean control chart and the range control chart.

[0091] The step 4 specifically includes:

[0092] Step 401: Calculate the average value of the pressure data;

[0093] Step 402: Determine whether the average value of the pressure data is within a preset pressure range;

[0094] Step 403: If the average value of the pressure data is not within the preset pressure range, the pressure test is unqualified, and the pressure vessel is determined to be unqualified;

[0095] Step 404: If the average value of the pressure data is within the preset pressure range, determine whether the pressure holding time during the pressure test is equal to or greater than the preset time, and generate a first determination result;

[0096] According to the provisions of "NB_T 47012-2010 Pressure Vessels for Refrigeration Devices", the pressure test of the pressure vessel should be maintained for at least 10 minutes. The pressure sensor 5 collects data once every 1 second, extracts a total of 600 data in the first 10 minutes of the pressure maintenance period, and groups the 600 data into 20 data as one subgroup, that is, the data collected in 20 seconds is one subgroup, and a total of 30 subgroups are divided, that is, preferably M=30, N=20. The preset time of the preferred pressure maintenance time is 10 minutes.

[0097] Step 405: If the first judgment result is that the pressure holding time is equal to the preset time, a first mean value and a first range value are calculated according to the pressure data and a first process mean value control chart and a first range control chart are established;

[0098] The control limits are calculated in the present invention to show the change and range of the mean and range of the subgroup when only common causes of variation exist. The control limits are determined by the sample size of the subgroup and the amount of variation within the subgroup reflected in the range. The control chart established in the embodiment of the present invention is as follows:

[0099] Control chart:

[0100] Center Line (CL):

[0101] Upper Control Limit:

[0102] Lower Control Limit:

[0103] R control chart:

[0104] Center Line (CL):

[0105] Upper Control Limit:

[0106] Lower Control Limit:

[0107] A2, D3, and D4 are all metering value control chart coefficients, and A2, D3, and D4 are determined by the subgroup capacity N, which can be obtained by looking up the metering value control chart coefficient table. In the embodiment of the present invention, preferably: A2 = 0.18, D3 = 0.415, D4 = 1.585.

[0108] Step 406: judging whether the pressure test is qualified according to the positions of the first mean value and the first range in the first process mean value control chart and the first range control chart respectively, and generating a second judgment result;

[0109] Specifically, the present invention determines whether the control chart is stable according to the control chart abnormality judgment criteria to verify whether the pressure test is qualified. The abnormality judgment criteria of the present invention are as follows:

[0110] The present invention uses the principle of mean range control chart to check whether the pressure data is out of control during the pressure maintenance period, so as to determine the qualification of the pressure vessel. Specifically, a control chart is drawn, and the first mean point is substituted into the first process mean control chart, and the first range point is substituted into the first range control chart. According to the first process mean control chart and the first range control chart, the judgment criteria for judging whether the process is stable and whether the control chart is controlled are as follows:

[0111] a. The point (mean point or extreme point) is outside the control limit or just on the control limit. When this happens, it is judged that the data in the pressure test is abnormal and the pressure test is judged to be unqualified.

[0112] b. 9 consecutive points (mean points or extreme points) fall on the same side of the center line. When this happens, it is judged that the specified pressure holding pressure or overpressure has not been reached during the pressure test, and the pressure test is judged to be unqualified.

[0113] c. Six points increase or decrease in a row, that is, they are connected in a series. When this happens, it is judged that the pressure test is abnormal, and overpressure or leakage may occur. The pressure test is judged to be unqualified.

[0114] d. 14 consecutive adjacent points alternate up and down. When this happens, it is determined that the pressure during the pressure holding period is unstable and the pressure test is deemed unqualified.

[0115] Step 407: If the second judgment result is that the pressure test is qualified, then the pressure vessel is determined to be qualified;

[0116] Step 408: If the second judgment result is that the pressure test is unqualified, then the pressure vessel is determined to be unqualified;

[0117] Step 409: if the first judgment result is that the pressure holding time is greater than the preset time, then extract the standard pressure data before the preset time (10 minutes) during the pressure holding period;

[0118] Step 410: Calculate the standard mean and standard range according to the standard pressure data and establish a second process mean control chart and a second range control chart;

[0119] Step 411: judging whether the pressure test is qualified according to the positions of the standard mean and the standard range in the second process mean value control chart and the second range control chart, respectively, and generating a third judgment result;

[0120] Step 412: If the third judgment result is that the pressure test is unqualified, then determine that the pressure vessel is unqualified;

[0121] Step 413: If the third judgment result is that the pressure test is qualified, then extract the current pressure data after the preset time (10 minutes) during the pressure holding period, and calculate the current mean and current range of the current pressure data;

[0122] Step 414: judging whether the pressure test is qualified according to the positions of the current mean and the current range in the second process mean value control chart and the second range control chart, respectively, and generating a fourth judgment result;

[0123] Step 415: If the fourth judgment result is that the pressure test is qualified, then the pressure vessel is determined to be qualified;

[0124] Step 416: If the fourth judgment result is that the pressure test fails, the pressure vessel is determined to be unqualified.

[0125] The present invention discloses a remote monitoring system and method for a pressure vessel and its pressure test. The present invention first binds the pressure vessel through an RFID tag to make the pressure vessel pressure test traceable, collects the data of the whole process of the pressure test through a temperature and pressure sensor and a video camera, and sends the data to a local industrial computer, which receives, saves and uploads the data. The local industrial computer judges the qualification of the pressure test according to the mean range control chart method on the local industrial computer. The mean range control chart method is to extract the pressure data of the first 10 minutes during the pressure holding period, draw the mean range control chart for analysis, judge whether the pressure test is qualified, and then determine whether the pressure vessel is qualified. In addition, the data uploaded by the local industrial computer can be uploaded to the cloud server, and the special inspection personnel can view the pressure test process data in real time through the remote terminal, monitor the pressure test site situation, and achieve the purpose of remote supervision of the pressure test.

[0126] The present invention proposes a remote monitoring system and method for a pressure vessel and its pressure test, which helps special inspectors to remotely observe the process data and results of the pressure test through a cloud platform, and objectively evaluates the pressure test of the pressure vessel through a mean range control chart based on the collected pressure data, thereby achieving the purpose of accurately determining the qualification of the pressure test and helping special inspectors to remotely monitor and evaluate the pressure test, and has the following advantages:

[0127] 1. The present invention uses the principle of the mean range control chart to determine the qualification of the pressure vessel, which can accurately determine whether the pressure test is qualified, avoid misjudgment and misjudgment, improve the accuracy of pressure test judgment, and achieve the purpose of scientifically evaluating the pressure test.

[0128] 2. The present invention can realize remote supervision through cloud service technology. Special inspection personnel can remotely view the pressure test temperature and pressure data, and can monitor the pressure test site in real time through video cameras, thereby achieving the purpose of remote supervision of the entire pressure test process.

[0129] 3. Ordinary users can log in to the remote App and enter the pressure vessel number or RFID tag ID to query the basic information of the pressure vessel and the test data of the entire pressure test process, making the pressure test of the pressure vessel traceable.

[0130] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0131] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A remote monitoring method for a pressure vessel and a pressure test thereof, characterized in that: include: Obtain pressure data collected by the pressure sensor during the pressure test; Calculate a process average and an average range based on the pressure data; Establish a process mean control chart and a range control chart according to the process mean and the mean range; Judging whether the pressure vessel is qualified according to the process mean value control chart and the range control chart specifically includes: Determine whether the pressure holding time during the pressure test is equal to or greater than a preset time, and generate a first determination result; If the first judgment result is that the pressure holding time is equal to the preset time, a first mean value and a first range value are calculated according to the pressure data and a first process mean value control chart and a first range control chart are established; According to the positions of the first mean and the first range in the first process mean value control chart and the first range control chart respectively, judging whether the pressure test is qualified, and generating a second judgment result; If the second judgment result is that the pressure test is qualified, the pressure vessel is determined to be qualified; If the second judgment result is that the pressure test is unqualified, the pressure vessel is determined to be unqualified; If the first judgment result is that the pressure holding time is greater than the preset time, extracting the standard pressure data before the preset time during the pressure holding period; Calculate the standard mean and standard range according to the standard pressure data and establish a second process mean value control chart and a second range control chart; According to the positions of the standard mean and the standard range in the second process mean value control chart and the second range control chart respectively, judging whether the pressure test is qualified, and generating a third judgment result; If the third judgment result is that the pressure test is unqualified, then determining that the pressure vessel is unqualified; If the third judgment result is that the pressure test is qualified, extracting the current pressure data after the preset time during the pressure holding period, and calculating the current mean and current range of the current pressure data; According to the positions of the current mean and the current range in the second process mean value control chart and the second range control chart respectively, judging whether the pressure test is qualified, and generating a fourth judgment result; If the fourth judgment result is that the pressure test is qualified, then the pressure vessel is determined to be qualified; If the fourth judgment result is that the pressure test is unqualified, then the pressure vessel is determined to be unqualified; The step of judging whether the pressure holding time during the pressure test is equal to or greater than the preset time also includes: Calculating an average value of the pressure data; determining whether the average value of the pressure data is within a preset pressure range, and generating a fifth determination result; If the fifth judgment result is that the average value of the pressure data is not within the preset pressure range, the pressure test is unqualified, and the pressure vessel is determined to be unqualified; If the fifth judgment result is that the average value of the pressure data is within the preset pressure range, the step of judging whether the pressure holding time during the pressure test is equal to or greater than the preset time is performed.

2. The remote monitoring method for a pressure vessel and a pressure test thereof according to claim 1, characterized in that: The calculating of the process average value and the average range according to the pressure data specifically includes: Dividing the pressure data into M subgroups according to the holding time, each subgroup includes N data; Using formula Calculate the mean for each subgroup; where is the jth data in the i-th subgroup, is the mean of the ith subgroup; N is the number of data in the subgroup; Using formula Calculates the range for each subgroup; where is the range of the ith subgroup, is the maximum value in the i-th subgroup, is the minimum value in the i-th subgroup; Based on the mean of each subgroup , using the formula Calculate the process average ; Where M is the number of subgroups; According to the range of each subgroup , using the formula Calculate the average range .

3. The remote monitoring method for a pressure vessel and a pressure test thereof according to claim 2, characterized in that: The process mean value control chart and the range control chart are established according to the process mean value and the mean range, specifically comprising: A process mean control chart is established according to the process mean and the average range; the process mean control chart includes a center line, an upper control limit and a lower control limit; the center line of the process mean control chart is the process mean ; According to the process average and the average range , using the formula Determine the upper control limit for the process mean control chart ; Where A2 is the measurement value control chart coefficient; According to the process average and the average range , using the formula Determine the lower control limit of the process mean control chart ; A range control chart is established based on the average range; the range control chart includes a center line, an upper control limit, and a lower control limit; the center line of the range control chart is the average range ; According to the average range , using the formula Determine the upper control limit of the range control chart ; Where D4 is the measurement value control chart coefficient; According to the average range , using the formula Determine the lower control limit of the range control chart ; Where D3 is the measurement value control chart coefficient.

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