An intelligent pressure maintaining instrument for gas pipeline pressure test and its test method

Abstract

The present invention discloses an intelligent pressure maintaining instrument for gas pipeline pressure test and its test method. The intelligent pressure maintaining instrument includes: a metal shell with a main circuit board inside; an atmospheric pressure sensor and a temperature and pressure integrated sensor, both arranged on the metal shell; a detection circuit arranged on the main circuit board for detecting natural gas pressure, temperature and atmospheric pressure; a control screen arranged on the metal shell for switching interfaces, monitoring the operation status of the device and setting parameters. The test method includes: S1. After the pipeline is pre-treated and installed, start the intelligent pressure maintaining instrument device; S2. Ensure that the range and accuracy of the pressure maintaining instrument device meet the test requirements; S3. The intelligent pressure maintaining instrument is internally provided with a sampling program for sampling and testing; S4. End the test; S5. Record the measured data in the database. The present invention has high measurement accuracy and low power consumption, can collect data according to the test type, and automatically calculate and correct the pressure drop, so as to automatically judge whether the pipeline meets the preset standard.

Description

Technical Field

[0001] The present invention relates to the technical field of gas pipeline quality detection, and particularly relates to an intelligent pressure maintaining instrument for gas pipeline pressure test and its test method. Background Art

[0002] With the wide use of natural gas as a clean energy source, pipeline transportation has become an efficient and economical way and is widely applied to urban gas transmission. To ensure the safe operation of gas pipelines, a tightness test must be carried out before formal production to verify whether the sealing performance of the pipeline system meets safety standards.

[0003] Under normal circumstances, this kind of detection work relies on testers to manually record various pressure parameters involved in the pressure test process for monitoring. When using gas to conduct airtightness tests on specific components or equipment, it is necessary to connect the gas source and the object to be tested through pipelines. During this process, the leakage problem at the joints is an important factor affecting the accuracy of the final test results. Therefore, high standards for the tightness of pipe joints and convenient and quick completion of pipeline connection become particularly important.

[0004] According to traditional test methods, when conducting gas pipeline detection, it usually includes two stages: strength test and tightness test; the former aims to evaluate the ability of the pipeline to withstand 1.5 times the maximum design pressure, and after reaching this pressure, it is maintained in a stable state for one hour to check for any leakage points; the latter is implemented after confirming that all interfaces are leak-free. The specific method is to backfill the entire pipeline and then apply a certain pressure (depending on the specific value of the designed gas transmission pressure P) and maintain it for at least 24 hours.

[0005] These traditional test steps mainly rely on different types of sensors to measure the internal pressure, temperature and external atmospheric pressure of the pipeline respectively, and the staff handwrites and records various data and their changes. After that, it is judged whether it is qualified according to the corresponding standards and the results are filed and saved. Therefore, the existing gas pipeline pressure test methods have various problems:

[0006] (1) Low data acquisition accuracy: Three different types of instruments are used to collect pipeline pressure, pipeline temperature and atmospheric pressure. Due to the different installation positions of the instruments and the uneven distribution of pressure and temperature, there may be large deviations in information such as pressure and temperature. Coupled with the inconsistent time nodes of manual transcription and visual errors, the reliability of the data is further reduced;

[0007] (2) High cost and low efficiency: During the process of engineers conducting strength and tightness tests on long-distance pipelines, it is often necessary to carry out measurement work at multiple measurement points. However, the excessive number of measurement instruments used will lead to a large amount of engineering work and poor economy;

[0008] (3) Obvious safety hazards: The minimum safety distance for the pressure test pipeline is 6 meters. However, during the actual operation process, since manual recording is required during the test process, the safety distance often fails to meet the requirements. Therefore, if an accident occurs during the test process, it will cause harm to the personnel within the safety distance;

[0009] (4) Low level of intelligence: Existing market instruments lack functions for abnormal alarm during the strength / leak tightness test process, such as abnormal pressure rise, abnormal pressure relief, and lack of judgment on test results;

[0010] (5) On-site data collection uses manual recording, which has subjective factors, and the handwritten ledger is inconvenient to store and query. If it needs to be entered into the system for future reference, additional labor costs are required.

[0011] Therefore, this application specifically proposes an intelligent pressure maintaining instrument for gas pipeline pressure test to solve the above technical problems. Summary of the Invention

[0012] The main purpose of the present invention is to provide an intelligent pressure maintaining instrument for gas pipeline pressure test to solve the technical problems proposed in the background technology.

[0013] The present invention adopts the following technical solutions to solve the above technical problems:

[0014] An intelligent pressure maintaining instrument for gas pipeline pressure test, comprising:

[0015] A metal shell with a main circuit board inside, and the metal shell is grounded for shielding electromagnetic interference;

[0016] An atmospheric pressure sensor and a temperature and pressure integrated sensor, both arranged on the metal shell;

[0017] A detection circuit, arranged on the main circuit board, for detecting natural gas pressure, temperature, and atmospheric pressure;

[0018] A battery compartment, arranged inside the metal shell, for installing and fixing the battery and optimizing the wiring;

[0019] A control screen, arranged on the metal shell, composed of a membrane switch and a liquid crystal screen. The membrane switch and the liquid crystal screen are used in cooperation to switch interfaces, monitor the operation status of the device, and set parameters;

[0020] An external antenna, arranged on the metal shell, for enhancing the Internet of Things communication signal.

[0021] Preferably, a group of ultra-low-power MCUs based on the ARM architecture for logical operations and program control, and a group of NB-IOT communication modules communicatively connected to the ultra-low-power MCUs via USART. The detection circuit uploads the data collected during the test to the cloud platform through the NB-IOT module;

[0022] Preferably, the ultra-low-power MCU is electrically connected to a control screen for corresponding setting and control of the pressure recorder;

[0023] Preferably, the battery inside the battery compartment is connected to the ultra-low-power MCU through an LDO voltage stabilizing circuit and an undervoltage detection circuit. The LDO voltage stabilizing circuit is used to stabilize the battery voltage to 3V;

[0024] Preferably, an analog switch is connected to the connection circuit between the undervoltage detection circuit and the ultra-low-power MCU. The analog switch is connected to an atmospheric pressure sensor and a temperature and pressure integrated sensor for turning off the specified circuit to reduce system power consumption.

[0025] Preferably, an amplification circuit connected to the analog switch is further provided on the main circuit board. The amplification circuit is connected to an atmospheric pressure sensor and a temperature and pressure integrated sensor for amplifying the voltage signal generated by the sensor in the detection circuit.

[0026] Preferably, the metal shell is composed of a front cover, a rear cover and an instrument shell made of aluminum alloy. The front cover, the rear cover and the instrument shell are all connected by threads, and the gaps between the front cover, the rear cover and the instrument shell are filled with sealing rubber to block external impurities.

[0027] A test method for an intelligent pressure maintaining instrument, using the intelligent pressure maintaining instrument for gas pipeline pressure test described in any one of the above, the specific steps include:

[0028] S1. Register the information of the pressure maintaining instrument with metrological certification into the database, lay the pipeline, install the mechanical spring pressure gauge, use the air compressor to pressurize to the test pressure, wait for the pressure in the pipeline to stabilize, close the instrument valve of the mechanical spring pressure gauge, replace the mechanical spring pressure gauge with the instrument of the pressure maintaining instrument, and open the valve to start the intelligent pressure maintaining instrument device;

[0029] S2. Create an electronic test work order, fill in the information of the intelligent pressure maintaining instrument device and the pipeline information. Based on the test work order, compare the range and accuracy of the intelligent pressure maintaining instrument. If the range and accuracy do not meet the preset test requirements, prompt the violation information and stop the work order;

[0030] S3. Upload information including the device connection status and the test pressure value. The peripheral ERP system issues an instruction to the current test instrument through the IOT platform. The intelligent pressure maintaining instrument is equipped with a sampling program. The instrument performs sampling operations through the intelligent pressure maintaining instrument, starts sampling at regular intervals and waits for the test to end. During the test, the sampling program is used to monitor real-time test data, data change trends, and the calculated real-time corrected pressure drop value as sampling parameters. If data anomalies occur during the test, the system will automatically alarm and record it through the peripheral ERP system. The alarm message is sent to the specified terminal for determining whether to terminate the test in advance or continue the test operation;

[0031] S4. After the test ends, send an end message to the specified terminal. After uploading the information including the device connection status and the test pressure value again, the test ends. The peripheral ERP system issues an instruction to the instrument end through the IOT platform. The instrument stops sampling and data uploading. The peripheral ERP system collects the data and calculates the test results through a standard formula to generate an engineering report;

[0032] S5. After the engineering report is manually confirmed, the peripheral ERP system files all the measured data and relevant reports during the test in the database.

[0033] Preferably, the specific steps of data sampling by the sampling program in step S3 include:

[0034] L1. Mean value processing: Collect n groups of data within a specified time t seconds, and perform mean value processing on the n groups of data. The processing result is regarded as the sampling value at this moment:

[0035]

[0036] Where is the sampling value, x i is the i-th group of data, and n is the total number of collected groups;

[0037] L2. Automatic correction of the qualified standard: Automatically modify the qualified standard [ΔP] according to the different lengths, materials, and diameters of the pipelines laid during the test;

[0038] L3. Determine whether the actual allowable pressure drop ΔP′ meets the standard based on the corrected qualified standard [ΔP]:

[0039]

[0040] Where H1 is the pipeline pressure before the test, B1 is the atmospheric pressure before the test, H2 is the pipeline pressure after the test, B2 is the atmospheric pressure after the test, t2 is the temperature of the medium in the pipeline before the test, and t1 is the temperature of the medium in the pipeline before the test.

[0041] Preferably, the specific operation steps of automatic correction of the qualified standard in step L2 include:

[0042] When the pipeline laid during the test is made of steel pipe or plastic, and the design pressure P ≤ 5 Kpa, there is:

[0043]

[0044] When the pipeline laid during the test is made of steel pipe, and the design pressure P > 5 Kpa, there is:

[0045]

[0046] When the pipeline laid during the test is made of plastic, and the design pressure P > 5 Kpa, there is:

[0047]

[0048] Where ΔP is the initial allowable pressure drop, T is the test duration, d n is the inner diameter of the nth pipeline, and l n is the length of the nth pipeline.

[0049] Preferably, the data abnormality in the step S3 is determined by a preset abnormal pressure rise and pressure relief determination formula, and the pressure relief determination formula is:

[0050] |x n - x1| ≥ 5%R

[0051] Where x n is the nth sampled pressure value, n is the number of acquisition groups, and R is the preset test pressure standard.

[0052] On the other hand, the present invention also discloses a computer-readable storage medium storing a computer program, and when the computer program is executed by a processor, the processor is caused to execute the steps of the above method.

[0053] On yet another aspect, the present invention also discloses a computer device including a memory and a processor, where the memory stores a computer program, and when the computer program is executed by the processor, the processor is caused to execute the steps of the above method.

[0054] As can be seen from the above technical solutions, the present invention provides an intelligent pressure maintaining instrument for gas pipeline pressure tests. Compared with the prior art, the present invention has the following advantages:

[0055] 1. The structure of the present invention is compact, delicate and reliable. It is an instrument integrating pipeline pressure, pipeline temperature and atmospheric pressure, with high measurement accuracy and low power consumption. It can automatically collect data according to the test type in accordance with the specification requirements, and automatically calculate and correct the pressure drop. The judgment of the qualified standard takes into account factors such as pipeline material, diameter, length and test duration, and can automatically judge whether the pipeline meets the actual application standard more.

[0056] 2. The present invention can simultaneously measure the atmospheric pressure, the gas pressure inside the pipeline, and the temperature inside the pipeline, and is portable. It can automatically sample multiple data simultaneously, reducing the measurement error and the workload of engineering personnel.

[0057] 3. The present invention can monitor the abnormal pressure increase and abnormal pressure relief moments inside the pipeline during the test process, avoiding illegal behaviors such as intermediate pressure boosting by engineering personnel to pass the test, and early warning of leakage points inside the pipeline.

[0058] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present invention, nor is it used to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. Of course, any product implementing the present invention does not necessarily need to achieve all the above-mentioned advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] The schematic diagrams of the drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0060] Figure 1 is the overall structural schematic diagram of the pressure maintaining instrument of the present invention;

[0061] Figure 2 is the schematic diagram of the structural disassembly of the pressure maintaining instrument of the present invention;

[0062] Figure 3 is the schematic diagram of the circuit hardware framework of the pressure maintaining instrument of the present invention;

[0063] Figure 4 is the schematic diagram of the test operation process of the pressure maintaining instrument of the present invention.

[0064] In the figure:

[0065] 1. Membrane switch; 2. Front cover; 3. LCD screen; 4. Main circuit board; 5. Sealing rubber; 6. Instrument case; 7. Atmospheric pressure sensor; 8. Antenna; 9. Battery compartment; 10. Rear cover; 11. Temperature and pressure integrated sensor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0066] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Without conflict, the embodiments and the features in the embodiments in this application can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0067] In the embodiments, please refer in detail to Figures 1 to 4 .

[0068] As Figure 1 and Figure 2 shown, an intelligent pressure maintaining instrument for gas pipeline pressure test proposed in the embodiments of the present invention includes:

[0069] A metal shell, inside which there is a main circuit board 4, and the metal shell is grounded for shielding electromagnetic interference;

[0070] An atmospheric pressure sensor 7 and a temperature and pressure integrated sensor 11, both of which are arranged on the metal shell;

[0071] A detection circuit, arranged on the main circuit board 4, for detecting natural gas pressure, temperature and atmospheric pressure;

[0072] A battery compartment 9, arranged inside the metal shell, for installing and fixing batteries and optimizing wire routing;

[0073] A control screen, arranged on the metal shell, composed of a membrane switch 1 and a liquid crystal screen 3. The membrane switch 1 and the liquid crystal screen 3 are used in cooperation for switching interfaces, monitoring the operation status of the device and setting parameters;

[0074] An external antenna 8, arranged on the metal shell, for enhancing the Internet of Things communication signal.

[0075] Furthermore, as Figure 3 shown, the detection circuit includes a group of ultra-low power consumption MCUs based on the ARM architecture for logic operation and program control and a group of NB-IOT communication modules communicatively connected to the ultra-low power consumption MCUs through USART. The detection circuit uploads the data collected during the test to the cloud platform through the NB-IOT module;

[0076] The ultra-low power consumption MCU is electrically connected to the control screen for making corresponding settings and controls on the pressure recorder;

[0077] The battery inside the battery compartment 9 is connected to the low power consumption MCU through an LDO voltage stabilizing circuit and an undervoltage detection circuit. The LDO voltage stabilizing circuit is used to stabilize the battery voltage to 3V;

[0078] An analog switch is connected to the connection circuit between the undervoltage detection circuit and the low power consumption MCU. The analog switch is connected to the atmospheric pressure sensor 7 and the temperature and pressure integrated sensor 11 for turning off the specified circuit to reduce the system power consumption.

[0079] In addition, referring to Figure 3 , in a specific implementation process, an amplification circuit connected to the analog switch is further arranged on the main circuit board 4. The amplification circuit is connected to the atmospheric pressure sensor 7 and the temperature and pressure integrated sensor 11 for amplifying the voltage signals generated by the sensors in the detection circuit.

[0080] It can also be supplemented that the metal shell is composed of the front cover 2, the rear cover 10 and the instrument shell 6 made of aluminum alloy. Threaded connections are used between the front cover 2, the rear cover 10 and the instrument shell 6, and the sealing rubber 5 is used to fill the gaps between the front cover 2, the rear cover 10 and the instrument shell 6 to block external impurities.

[0081] At this time, since the intelligent pressure maintaining instrument is connected to a high-precision instrument and the gas pipeline, the pressure test operation of the gas pipeline can be carried out.

[0082] On the other hand, the present invention also discloses a test method for an intelligent pressure maintaining instrument, using the intelligent pressure maintaining instrument specifically used for the gas pipeline pressure test in the above embodiment to specify the corresponding test operation, such as Figure 4 As shown, the specific steps include:

[0083] (1) Preset the test standards for pipeline strength and tightness:

[0084] (a) Strength test standard:

[0085] a1. Test medium: Generally, clean water is used as the test medium. When the pipeline design pressure is less than or equal to 0.8 MPa, gas can also be used for the test, but effective safety measures must be taken;

[0086] a2. Test pressure:

[0087] When water is used as the test medium, the test pressure should be 1.5 times the design pressure, but not less than 0.6 MPa;

[0088] When gas is used as the test medium, the test pressure should be 1.15 times the design pressure, but not less than 0.1 MPa;

[0089] a3. Pressure stabilization time: After reaching the test pressure, the pressure stabilization time should be determined according to the pipeline material and diameter. Generally, the pressure stabilization time is not less than 10 min (the specific time may vary due to factors such as region and specific engineering requirements);

[0090] a4. Qualification standard: During the pressure stabilization time, if there is no obvious deformation, no leakage, and no pressure drop (based on the pressure gauge reading) in the pipeline, the strength test is qualified;

[0091] (b) Tightness test standard:

[0092] b1. Test medium: Generally, air is used as the test medium, but in special cases, other gases can also be used according to the design requirements;

[0093] b2. Test pressure: It should be the design pressure and not less than 0.1 MPa;

[0094] b3. Stabilization time: The stabilization time shall be not less than 24 hours. For pipelines with special requirements, the stabilization time may be longer.

[0095] b4. Passing criteria: During the stabilization time, the pressure value shall be recorded not less than once per hour. When the corrected pressure drop is less than 133 Pa, it is considered qualified.

[0096] (2) Engineering personnel shall register the information of the pressure-holding instrument with metrological certification into the database in advance. The registered information includes: the SN code of the pressure-holding instrument, IMEI number, instrument range, instrument accuracy, instrument certification number, effective date and expiration date of the certification.

[0097] (3) Engineering personnel shall lay the pipeline, install the mechanical spring pressure gauge, and use the air compressor to pressurize to the test pressure until the pressure in the pipeline is stable.

[0098] (4) Close the instrument valve of the mechanical spring pressure gauge, connect the intelligent pressure-holding instrument device provided in the above embodiment to the pipeline, replace the mechanical spring pressure gauge with the instrument of the pressure-holding instrument, and press the device power button to open the valve to start the intelligent pressure-holding instrument device.

[0099] It should be noted at this time that the replaced test instrument needs to be registered and filed on the engineering management platform before being put into use to prevent some instruments without metrological certification and explosion-proof certification from being put into use, ensuring the authenticity of the data and the reliability of the test results.

[0100] (5) The intelligent terminal (such as a mobile phone) shall open the engineering management software APP, create an electronic test work order, and fill in the information of the intelligent pressure-holding instrument device and the engineering information including test type, test duration, pipeline design pressure, pipeline material, pipeline inner diameter, and pipeline length.

[0101] (6) After creating the test work order, the intelligent terminal (such as a mobile phone) shall scan the QR code on the instrument, and compare the range and accuracy of the intelligent pressure-holding instrument based on the test work order. If the instrument has metrological certification and is within the validity period, and the range and accuracy meet the test requirements, the next step can be continued. If it does not meet the preset test requirements, illegal information shall be prompted and the work order shall be stopped.

[0102] (7) Engineering personnel shall take on-site photos, which include key information such as the equipment connection situation and the value of the test pressure, and only then can they press the test start button after uploading.

[0103] (8) The peripheral ERP system shall send instructions to the current test instrument through the IOT platform. The intelligent pressure-holding instrument is equipped with a sampling program, and the instrument shall perform sampling operations according to the regulations through the intelligent pressure-holding instrument and start sampling at the specified time. At this time, engineering personnel shall retreat to the safe distance specified in the specification and wait for the test to end.

[0104] The instrument here can measure the atmospheric pressure, the gas pressure inside the pipeline, and the temperature inside the pipeline simultaneously, and it is portable. It can automatically sample multiple data at the same time, reducing measurement errors, reducing the workload of engineering personnel, having a high cost performance, and ensuring the authenticity of data, etc.;

[0105] (9) During the test, engineering personnel can use the engineering management software APP to view and monitor real-time test data, the trend of data changes, and sampling parameters such as the real-time corrected pressure drop value calculated through the sampling program;

[0106] The data processing flow steps of the sampling program for data sampling at this time include:

[0107] L1. Mean value processing: Collect n groups of data within a specified time t seconds, and perform mean value processing on the n groups of data. The processing result is used as the sampling value at this moment:

[0108]

[0109] Among them is the sampling value, x i is the i-th group of data, and n is the total number of collected groups;

[0110] L2. Automatic correction of the qualified standard: Automatically modify the qualified standard [ΔP] according to the length, material, and diameter of the pipeline laid during the test. Specifically:

[0111] If the pipeline laid during the test is made of steel or plastic, and the design pressure P ≤ 5Kpa, there is:

[0112]

[0113] If the pipeline laid during the test is made of steel, and the design pressure P > 5Kpa, there is:

[0114]

[0115] If the pipeline laid during the test is made of plastic, and the design pressure P > 5Kpa, there is:

[0116]

[0117] Among them, ΔP is the initial allowable pressure drop, T is the test duration, d n is the inner diameter of the n-th pipeline, l n is the length of the n-th pipeline;

[0118] L3. Based on the corrected qualified standard [ΔP], determine whether the actual allowable pressure drop ΔP′ meets the standard:

[0119]

[0120] Where H1 is the pipeline pressure before the test, B1 is the atmospheric pressure before the test, H2 is the pipeline pressure after the test, B2 is the atmospheric pressure after the test, t2 is the medium temperature in the pipeline before the test, and t1 is the medium temperature in the pipeline before the test;

[0121] (10) If data anomalies occur during the process, the system will automatically alarm and record them through the peripheral ERP system. The alarm message will be sent to the terminals of relevant engineering personnel (such as mobile phones); the engineering personnel will determine whether to terminate the test in advance or continue the test operation according to the actual situation;

[0122] At this time, data anomalies are determined through a preset abnormal pressure rise and pressure relief determination formula. The pressure relief determination formula is:

[0123] |x n -x1|≥5%R

[0124] Where x n is the nth sampled pressure value, n is the number of sampling groups, and R is the preset test pressure standard, generally the initial sampled pressure value x1;

[0125] At this time, since the instrument can monitor the abnormal pressure rise and abnormal pressure relief moments in the pipeline during the test through an intelligent pressure maintaining instrument and a sampling program, it can prevent engineering personnel from engaging in illegal behaviors such as boosting pressure midway to pass the test and can give early warnings about leakage points in the pipeline;

[0126] (11) When the test ends, an end message will be pushed to the terminals of relevant engineering personnel (such as mobile phones);

[0127] It should be noted here that the above instrument uses automatic data collection and remote data upload. Engineering personnel do not have to stay on site to record data all the time, and can also achieve the safe distance required in the specification during the test, improving the safety during the test and the stability and reliability of the data;

[0128] (12) The engineering personnel take on-site photos. The on-site photos include key information such as the equipment connection situation and the test pressure value, and then press the test end button after uploading;

[0129] (13) The peripheral ERP system issues an instruction to the instrument end through the IOT platform, and the instrument stops sampling and data uploading;

[0130] (14) The peripheral ERP system collects the data, calculates the test results through a standard formula to generate an engineering report. After the on-site test personnel confirm that it is correct, they press the submission button, and the engineering report will be pushed to the supervision end;

[0131] At this time, the ERP system can automatically give the test results for the uploaded test data, avoiding the heavy calculation workload of engineering personnel, making the data intuitive and reliable, and improving the efficiency;

[0132] (15) The supervision side reviews the test project reports and on-site photos. After confirming that there are no errors, the submission button can be pressed to end the engineering test;

[0133] (16) Throughout the process, the peripheral ERP system files all the measured data and relevant reports during the test in the database. Since all test data will be recorded and filed on the ERP platform, it is convenient for future traceability and query.

[0134] It should be noted that engineering personnel must operate step by step according to the procedures specified by the engineering management platform, reducing the illegal operation behaviors of engineering personnel and improving the reliability of test results.

[0135] At the same time, it should also be noted that the above operation steps all comply with the preset pipeline strength and tightness test standards.

[0136] In summary, the intelligent pressure maintaining instrument proposed by the present invention has a compact, delicate and reliable structure. It is an instrument that integrates pipeline pressure, pipeline temperature and atmospheric pressure, with high measurement accuracy and low power consumption. It can automatically collect data according to the test type in accordance with the specification requirements, automatically calculate and correct the pressure drop, and judge the qualification standard considering factors such as pipeline material, diameter, length and test duration. It can automatically judge whether the pipeline more meets the actual application standards;

[0137] At the same time, during the pressure test process, the supporting ERP system is used to manage and monitor whether the instrument is compliant, whether the test procedures are compliant, and whether the test process is compliant. Therefore, the entire test process can be digitized, the efficiency of intelligence can be improved, and all files can be quickly traced.

[0138] Test example.

[0139] Based on the above embodiments, the present invention can also provide specific test examples to prove the effectiveness of the technical solution in actual use: In the project A of newly laid medium-pressure class B gas steel pipes with the same diameter, the pipe diameter is Φ518*8mm and the length is 400 meters:

[0140] After the strength test is qualified, a 24-hour tightness test is carried out (from 14:00 at noon to 14:00 the next day), recorded once every 5 minutes and sampled once every 1 hour. The sampling parameters of the pressure maintaining instrument are shown in the following table:

[0141]

[0142]

[0143] At this time, the inner diameter of the steel pipe: D = 0.518 - 0.008 * 2 = 0.502M

[0144] Substitute into the allowable pressure drop formula, we get:

[0145]

[0146] Therefore, the actual pressure drop is as follows:

[0147]

[0148] Since ΔP′ < [ΔP], the tightness test of the newly built medium-pressure Class B gas steel pipe project with the same diameter is qualified and can be put into production and use;

[0149] In addition, if the engineering team pressurizes during the process or there is a leakage in the pipeline, the obvious pressure drop can be detected through:

[0150] |x n - x1| ≥ 5%R

[0151] Taking the test at the 17th hour as an example:

[0152] |466.12 - 467.13| = 1.01 < 5% * 467.13 = 23.3565

[0153] So it is not currently within the alarm range.

[0154] In another embodiment provided by the present application, a computer program product including a sampling instruction is also provided. When it runs on a computer, it enables the computer to execute the same sampling method during the test process of the above-mentioned embodiment.

[0155] It can be understood that the system provided by the embodiments of the present invention corresponds to the method provided by the embodiments of the present invention. For the explanations, examples and beneficial effects of the relevant content, reference can be made to the corresponding parts in the above method.

[0156] It should also be supplemented that the above terminal device can also be referred to as a terminal, user equipment, mobile station, mobile terminal, etc. The terminal device can be a mobile phone, smart TV, wearable device, tablet computer, computer with wireless transceiver function, virtual reality terminal device, augmented reality terminal device, wireless terminal in industrial control, wireless terminal in unmanned driving, wireless terminal in transportation safety, wireless terminal in smart city, wireless terminal in smart home, etc. The specific technologies and specific device forms adopted by the terminal device in the embodiments of the present application are not limited.

[0157] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from a website, computer, server, or data center to another website, computer, server, or data center by wire (such as coaxial cable, optical fiber, digital subscriber line) or wirelessly (such as infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer, or a data storage device such as a server or data center that includes one or more integrated available media. The available medium can be a magnetic medium (such as a floppy disk, hard disk, magnetic tape), an optical medium, or a semiconductor medium (such as a solid-state drive), etc.

[0158] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

[0159] In addition, it should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0160] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" can explicitly or implicitly include at least one such feature. In addition, the meaning of "and / or" appearing throughout the text includes three parallel scenarios. Taking "A and / or B" as an example, it includes scenario A, scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, in the embodiments of the present invention, "a plurality" means two or more. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those skilled in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

Claims

1. An intelligent pressure maintaining instrument for gas pipeline pressure test, characterized in that, Including: A metal housing with a main circuit board (4) inside, and the metal housing is grounded for shielding electromagnetic interference; An atmospheric pressure sensor (7) and a temperature and pressure integrated sensor (11), both arranged on the metal housing; A detection circuit, arranged on the main circuit board (4), for detecting natural gas pressure, temperature, and atmospheric pressure; A battery compartment (9), arranged inside the metal housing, for installing and fixing the battery and optimizing the wiring; A control screen, arranged on the metal housing, composed of a membrane switch (1) and a liquid crystal display screen (3), and the membrane switch (1) and the liquid crystal display screen (3) are used in cooperation for switching interfaces, monitoring the operation status of the device, and setting parameters; An external antenna (8), arranged on the metal housing, for enhancing the Internet of Things communication signal; The detection circuit includes: a group of ultra-low power consumption MCUs based on the ARM architecture for logic operation and program control, and a group of NB-IOT communication modules communicatively connected to the ultra-low power consumption MCU through USART. The detection circuit uploads the data collected during the test to the cloud platform through the NB-IOT module; The ultra-low power consumption MCU is electrically connected to the control screen for performing corresponding settings and controls on the pressure maintaining instrument; The battery inside the battery compartment (9) is connected to the ultra-low power consumption MCU through an LDO voltage stabilizing circuit and an undervoltage detection circuit, and the LDO voltage stabilizing circuit is used to stabilize the battery voltage to 3V; An analog switch is connected to the connection circuit between the undervoltage detection circuit and the ultra-low power consumption MCU, and the analog switch is connected to the atmospheric pressure sensor (7) and the temperature and pressure integrated sensor (11) for turning off the specified circuit to reduce the system power consumption; 2. The intelligent pressure-holding instrument for gas pipeline pressure test according to claim 1, wherein An amplification circuit connected to the analog switch is also arranged on the main circuit board (4), and the amplification circuit is connected to the atmospheric pressure sensor (7) and the temperature and pressure integrated sensor (11) for amplifying the voltage signals generated by the sensors in the detection circuit; 3. The intelligent pressure maintaining instrument for gas pipeline pressure test according to claim 1, characterized in that, The metal housing is composed of a front cover (2), a rear cover (10), and an instrument housing (6) made of aluminum alloy. The front cover (2), the rear cover (10), and the instrument housing (6) are all connected by threads, and a sealing rubber (5) is used to fill the gaps between the front cover (2), the rear cover (10), and the instrument housing (6) for blocking external impurities; 4. A test method for an intelligent pressure maintaining instrument, characterized in that, When using the intelligent pressure maintaining instrument for gas pipeline pressure test described in any one of the above claims 1-3, the specific steps include: S1. Register the information of the pressure maintaining instrument with metrological certification into the database, lay the pipeline, install a mechanical spring pressure gauge, use an air compressor to pressurize to the test pressure, wait for the pressure in the pipeline to stabilize, close the instrument valve of the mechanical spring pressure gauge, replace the mechanical spring pressure gauge with the instrument of the pressure maintaining instrument, and open the valve to start the intelligent pressure maintaining instrument device; S2. Create an electronic test work order, fill in the information of the intelligent pressure maintaining instrument device and the pipeline information, and compare the range and accuracy of the intelligent pressure maintaining instrument based on the test work order. If the range and accuracy do not meet the preset test requirements, prompt violation information and stop the work order; S3. Upload information including the connection status of the device and the test pressure value. The peripheral ERP system issues an instruction to the current test instrument through the IOT platform. The intelligent pressure-holding instrument is equipped with a sampling program. The instrument performs sampling operations through the intelligent pressure-holding instrument, starts sampling at regular intervals and waits for the test to end. During the test, the sampling program is used to monitor real-time test data, data change trends, and the calculated real-time corrected pressure drop value as sampling parameters. If data anomalies occur during the test, the system automatically alarms and records them through the peripheral ERP system. The alarm message is sent to the designated terminal for determining whether to terminate the test in advance or continue the test operation; S4. After the test ends, send an end message to the designated terminal, upload the information including the connection status of the device and the test pressure value again, and then end the test. The peripheral ERP system issues an instruction to the instrument end through the IOT platform. The instrument stops sampling and data uploading. The peripheral ERP system collects data and calculates the test results through a standard formula to generate an engineering report; S5. After the engineering report is manually confirmed, the peripheral ERP system files all the measured data and relevant reports during the test in the database; The specific steps for data sampling by the sampling program in step S3 are as follows: L1. Mean value processing: Collect n groups of data within a specified time t seconds, and perform mean value processing on the n groups of data. The processing result is regarded as the sampling value at this moment: wherein is the sampled value, is the th group of data, is the total number of acquisition groups; L2.Automatic correction of acceptance criteria: Automatically modify the acceptance criteria according to the length, material, and diameter of the pipeline laid during the test ; L3. Based on the revised passing criteria Determine the actual allowable pressure drop Whether it meets the standard: wherein is the pipeline pressure before the test, is the atmospheric pressure before the test, is the pipeline pressure after the test, is the atmospheric pressure after the test, is the medium temperature in the pipeline before the test, is the medium temperature in the pipeline before the test; The specific operation steps for automatically correcting the passing standard in step L2 are as follows: If the pipeline laid during the test is made of steel pipe or plastic, and the design pressure P ≤ 5Kpa, there is: If the pipeline laid during the test is made of steel pipe, and the design pressure P > 5Kpa, there is: If the pipeline laid during the test is made of plastic, and the design pressure P > 5Kpa, there is: in is the initial allowable pressure drop, is the duration of the trial, For the The inner diameter of the root pipe, For the The length of the root pipe.

5. The test method of the intelligent pressure maintaining instrument according to claim 4, characterized in that, The data anomalies in step S3 are determined through a preset abnormal pressure rise and pressure relief determination formula. The pressure relief determination formula is: Among them, is the th sampling pressure value, is the number of acquisition groups, is the preset test pressure standard.

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