CN116007840A - Online comparison method of absolute pressure transmitter - Google Patents
Online comparison method of absolute pressure transmitter Download PDFInfo
- Publication number
- CN116007840A CN116007840A CN202211682237.3A CN202211682237A CN116007840A CN 116007840 A CN116007840 A CN 116007840A CN 202211682237 A CN202211682237 A CN 202211682237A CN 116007840 A CN116007840 A CN 116007840A
- Authority
- CN
- China
- Prior art keywords
- instrument
- comparison
- line
- pressure
- pipeline
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Landscapes
- Measuring Fluid Pressure (AREA)
Abstract
The invention belongs to the technical field of centrifugal isotope separation, and particularly relates to an online comparison method of an absolute pressure transmitter. The invention comprises the following steps: step 1: statistics and instrument classification; step 2: freely adjusting the pressure in the pipeline; step 3: process shielding; step 4: and (5) on-line comparison. The invention is suitable for carrying out on-line measurement record data and analysis comparison on absolute pressure transmitters inconvenient to disassemble and assemble of a centrifugal cascade process system, realizes the consistency of the same-quantity measurement of the process system under the same condition, meets the specified metering requirement, ensures that the measurement error or the uncertainty of the instrument is kept within the specified limit, and ensures the accuracy and the reliability of the measurement instrument.
Description
Technical Field
The invention belongs to the technical field of centrifugal isotope separation, and particularly relates to an online comparison method of an absolute pressure transmitter.
Background
The absolute pressure meter plays a vital role in the stable and safe operation of the production line process system. However, the problems of signal drift, precision reduction and the like exist when the instrument is used for a certain time on line, and verification and calibration work must be carried out regularly. At present, an instrument is mainly detached from a pipeline, and the instrument is verified in an off-line verification mode. However, for a continuous process line, the following difficulties exist in meter disassembly:
1) The production line needs to run continuously, can not be stopped, and the instrument disassembly conditions are difficult to meet;
2) In the process of disassembling and assembling the instrument, the leakage of working materials in a process pipeline on a production line is easy to cause, and the safety risk exists;
3) In the disassembly and verification process, the instrument is switched between air and working substances, and the working substances are condensed to cause the blockage of the pipeline.
The current method of calibrating absolute pressure transmitters in a process cascade can only be disassembled for inspection. The disassembly and inspection method has the following defects:
the method has the following defects: because the pressure accident protection sensor must be connected to work when the process cascade is normally operated, a standby instrument is required to be installed during the disassembly and inspection of each accident protection instrument to ensure the normal work of accident protection, a large number of standby absolute pressure transmitters are required, and the cost of instrument spare parts is increased.
And the second disadvantage is that: the absolute pressure transmitter not only increases the packaging and transportation cost in the process of inspection, but also reduces the precision of the instrument and even damages the instrument due to jolt of a road in the transportation process.
And the third disadvantage is: in the process of disassembling and installing the standby instrument and installing the original working point after the verification instrument returns, the working procedures of installing the purging trolley, filling liquid nitrogen for freezing, purging and evacuating the connecting pipeline are added, the working strength of the replacement personnel is high, 3-4 persons are required to cooperate for operation, the average time is 60-80 min, the replacement efficiency is low, the workload is high, and the manpower and material resources are consumed; and frequent replacement operations can increase environmental pollution and the dose of radiation received by the operator.
Fourth disadvantage: the absolute pressure transmitter which is frequently disassembled and assembled on line and used for accident protection is easy to cause process accidents due to human factors during the protection period of shielding pressure accidents and the disassembly and assembly operation process, and the occurrence rate of the process cascade safety risk is increased.
Disclosure of Invention
The invention provides an on-line comparison method of absolute pressure transmitters, which is suitable for on-line measurement record data and analysis comparison of absolute pressure transmitters inconvenient to disassemble and assemble of a centrifugal cascade process system, realizes the consistency of the same-quantity measurement of the process system under the same condition, meets the specified metering requirement, ensures that the measurement error or the uncertainty of the instrument is kept within the specified limit, and ensures the accuracy and the reliability of the measurement instrument.
The invention adopts the technical scheme that:
an absolute pressure transmitter on-line comparison method comprises the following steps:
step 1: statistics and instrument classification; step 2: freely adjusting the pressure in the pipeline; step 3: process shielding; step 4: and (5) on-line comparison.
In the step 1, the installation environment and structure type characteristics of the production line instruments are counted, wherein the installation environment and structure type characteristics comprise operation parameters, precision requirements, installation points and interlocking protection of the instruments, and the instruments to be compared are classified.
The classification includes the following aspects: interoperability of instrument mounting pipelines; the instrument pressure guiding pipe is connected with a valve type; whether the system pipeline has a purging function or not; instrument model, accuracy, range.
In the step 2, according to the trend and classification of the process pipelines, the pipelines between the double valves are selected as pressure balance cavities, and pressure balance comparison is carried out. Using a mobile alignment device as an evacuation purge device when aligning CPCA meters; pressure adjustments are made using the system purge means when comparing the JHC meters.
In the step 3, after the pressure in the pipeline can be freely regulated, the protection of the related pipeline is interlocked and is in a shielding state, meanwhile, the process control level equipment is cut into an on-site mode, and hot standby is carried out by adopting a mode of manual on-site operation, so that the influence of misoperation signals on the system is avoided.
The step 4 specifically includes the following steps: the corrected measurement result of the standard table is used as a comparison reference value; and measuring and recording data of the reference pressure gauge and the standard gauge, and comparing, wherein the error obtained by the comparison is not larger than the maximum allowable error of the working measuring instrument, and the standard gauge is qualified.
The error calculation formula is shown in formula (1):
error = measurement value (X measured) -measurement true value (Xc) (1)
After the error of the working measuring instrument is smaller than a specified value, performing an on-line stability test to show that the short-time drift characteristic of the working measuring instrument is qualified when the measured value is within an error interval;
and instrument drift test is carried out within 5min, after the pressure energy in the process pipeline is kept basically close to the static pressure state, the measured value of the reference meter is not changed more than the maximum allowable error of the instrument within 5min, and the process is qualified,
the calculation formula is shown in formula (2):
X5min＝|X1- X2|≤MPEV (2)
wherein: a change amount of X5min-5 min; x1-5min pre-measurement; measuring after X2-5 min; MPEV-maximum allowable error absolute value.
Compared with the prior art, the invention has the beneficial effects that:
(1) The on-line comparison method of the absolute pressure transmitter provided by the invention reduces the workload of detaching and inspecting the instrument, reduces the safety operation risk of detaching and inspecting the on-line use instrument on the process system, saves the verification cost and the production cost, reduces the operation times, shortens the operation time, obviously reduces the radiation dose received by operators, and protects the production environment.
(2) The absolute pressure transmitter on-line comparison method provided by the invention can be used for directly carrying out on-line comparison on the process pipeline instrument, so that the number of times of instrument disassembly and assembly is reduced, and the stable operation of a process system is ensured.
(3) The on-line comparison method of the absolute pressure transmitter provided by the invention has the advantages that the comparison process system is safe and stable, the magnitude transmission is accurate, the absolute pressure transmitter with inaccurate magnitude is found out in time and replaced, the accurate measurement is ensured, and the measurement guarantee is provided for the efficient and stable operation of a process loop.
(4) The online comparison method of the absolute pressure transmitter provided by the invention provides a new way for judging the magnitude accuracy of the metering device of the continuous operation system, is simple and convenient to operate and high in safety, saves a large amount of production cost, and reduces the pollution of radioactive substances to the environment.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides an on-line comparison method of an absolute pressure transmitter, which comprises the following steps:
step 1: statistics and meter classification
The installation environment and structure type characteristics of the production line instrument are counted, and the production line instrument comprises the characteristics of operation parameters, precision requirements, installation points, interlocking protection and the like of the instrument. The instrument to be compared is classified, and mainly comprises the following aspects:
1) Interoperability of instrument mounting pipelines;
2) The instrument pressure guiding pipe is connected with a valve type;
3) Whether the system pipeline has a purging function or not;
4) Instrument model, accuracy, range.
Step 2: freely adjusting pressure in pipeline
An important function in the instrument comparison process is that the pressure in the pipeline can be freely adjusted, and the requirement of comparison work is met. According to the trend and classification of the process pipelines, the pipelines between the double valves are selected as pressure balance cavities, and pressure balance comparison is carried out. Using a mobile alignment device as an evacuation purge device when aligning CPCA meters; pressure adjustments are made using the system purge means when comparing the JHC meters.
Step 3: process shield
The purpose of on-line comparison is to reduce the disassembly and assembly of pipeline meters and ensure the stable operation of a main process system. Therefore, after the pressure in the pipeline can be freely regulated, the protection of the related pipeline is interlocked and is in a shielding state, meanwhile, the process control level equipment is cut into an on-site mode, and hot standby is carried out by adopting a manual on-site operation mode, so that the influence of a misoperation signal on the system is avoided.
Step 4: on-line comparison
And selecting an instrument which is good in stability and acceptable in error and is calibrated by an upper standard as a comparison standard meter, wherein the measuring range can cover the measuring range of the working measuring instrument, and the accuracy grade is not lower than that of the working measuring instrument. The corrected measurement result of the standard table is used as a comparison reference value; and measuring and recording data of the reference pressure gauge and the standard gauge, and comparing, wherein the error obtained by the comparison is not larger than the maximum allowable error of the working measuring instrument, and the standard gauge is qualified.
The error calculation formula is shown in formula (1):
error = measurement value (X measured) -measurement true value (Xc) (1)
And after the error of the working measuring instrument is smaller than a specified value, performing an on-line stability test to show that the short-time drift characteristic of the working measuring instrument, wherein the measured value is qualified in an error interval range.
And (3) instrument drift test within 5min, wherein after the pressure energy in the process pipeline is kept basically close to the static pressure state, the measured value of the reference meter is changed within 5min and is not more than the maximum allowable error of the instrument, and the instrument drift test is qualified.
The calculation formula is shown in formula (2):
X5min＝|X1- X2|≤MPEV (2)
wherein: a change amount of X5min-5 min; x1-5min pre-measurement; measuring after X2-5 min; MPEV-maximum allowable error absolute value.
After instrument drift test is completed within 5min, process safety measures are taken by process personnel, after the comparison device is subjected to air breaking and purging for 5 times, the operation line is recovered after monitoring and rechecking, the normal operation is observed, the accident protection shielding is relieved, and the comparison of the online absolute pressure transmitter is completed.
When the comparison device is used for on-line comparison, the CPCA instrument measuring range section is divided into five points, and the five points are respectively subjected to pressure verification. The comparison device adjusts the pressure in the balance cavity to meet the comparison requirement, and the unqualified comparison instrument is disassembled on site and verified.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (7)
1. An absolute pressure transmitter on-line comparison method, comprising the steps of:
step 1: statistics and instrument classification; step 2: freely adjusting the pressure in the pipeline; step 3: process shielding; step 4: and (5) on-line comparison.
2. The on-line comparison method of absolute pressure transmitters according to claim 1, wherein in step 1, the installation environment and the structural type characteristics of the production line meters are counted, and the meters to be compared are classified according to the operation parameters, the precision requirements, the installation points and the interlocking protection of the meters.
3. The absolute pressure transmitter online comparison method of claim 2, wherein the classification comprises: interoperability of instrument mounting pipelines; the instrument pressure guiding pipe is connected with a valve type; whether the system pipeline has a purging function or not; instrument model, accuracy, range.
4. The on-line comparison method of absolute pressure transmitters according to claim 3, wherein in step 2, a pipeline between two valves is selected as a pressure balance cavity according to the trend and classification of the process pipeline, and the pressure balance comparison is performed. Using a mobile alignment device as an evacuation purge device when aligning CPCA meters; pressure adjustments are made using the system purge means when comparing the JHC meters.
5. The on-line comparison method of absolute pressure transmitters of claim 4, wherein in step 3, after the pressure in the pipeline is ensured to be freely adjustable, the related pipeline is protected and interlocked and is in a shielding state, and meanwhile, the process control level equipment is cut into an on-site mode, and hot standby is performed in a manual on-site operation mode, so that the influence of a false operation signal on the system is avoided.
6. The on-line absolute pressure transmitter comparison method of claim 5, wherein in step 4, the method specifically comprises the steps of: the corrected measurement result of the standard table is used as a comparison reference value; and measuring and recording data of the reference pressure gauge and the standard gauge, and comparing, wherein the error obtained by the comparison is not larger than the maximum allowable error of the working measuring instrument, and the standard gauge is qualified.
7. The on-line absolute pressure transmitter comparison of claim 6, wherein,
the error calculation formula is shown in formula (1):
error = measurement value (X measured) -measurement true value (Xc) (1)
After the error of the working measuring instrument is smaller than a specified value, performing an on-line stability test to show that the short-time drift characteristic of the working measuring instrument is qualified when the measured value is within an error interval;
and instrument drift test is carried out within 5min, after the pressure energy in the process pipeline is kept basically close to the static pressure state, the measured value of the reference meter is not changed more than the maximum allowable error of the instrument within 5min, and the process is qualified,
the calculation formula is shown in formula (2):
X5min＝|X1- X2|≤MPEV (2)
wherein: a change amount of X5min-5 min; x1-5min pre-measurement; measuring after X2-5 min; MPEV-maximum allowable error absolute value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211682237.3A CN116007840A (en) | 2022-12-27 | 2022-12-27 | Online comparison method of absolute pressure transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211682237.3A CN116007840A (en) | 2022-12-27 | 2022-12-27 | Online comparison method of absolute pressure transmitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116007840A true CN116007840A (en) | 2023-04-25 |
Family
ID=86036682
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211682237.3A Pending CN116007840A (en) | 2022-12-27 | 2022-12-27 | Online comparison method of absolute pressure transmitter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116007840A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116448314A (en) * | 2023-06-12 | 2023-07-18 | 乐山市计量测试所 | Independent pressure source and pressure gauge online detection method |
| CN116448315A (en) * | 2023-06-12 | 2023-07-18 | 乐山市计量测试所 | Online detection method for pressure gauge |
-
2022
- 2022-12-27 CN CN202211682237.3A patent/CN116007840A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116448314A (en) * | 2023-06-12 | 2023-07-18 | 乐山市计量测试所 | Independent pressure source and pressure gauge online detection method |
| CN116448315A (en) * | 2023-06-12 | 2023-07-18 | 乐山市计量测试所 | Online detection method for pressure gauge |
| CN116448315B (en) * | 2023-06-12 | 2023-08-29 | 乐山市计量测试所 | Online detection method for pressure gauge |
| CN116448314B (en) * | 2023-06-12 | 2023-08-29 | 乐山市计量测试所 | Independent pressure source and pressure gauge online detection method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN116007840A (en) | Online comparison method of absolute pressure transmitter | |
| CN101255947B (en) | Metered system for automatically capturing fluid flux | |
| US20170089753A1 (en) | Calibration device | |
| CN106919127B (en) | Material level detection method based on software virtual technology | |
| CN203490209U (en) | Calibrating device for harmful gas detection alarm of coal mine | |
| CN113375760B (en) | Ship lock operation dynamic water level monitoring method based on single-point multiple sensors | |
| CN106594525B (en) | Gas pipeline pressure flow hybrid control system integration sledge fills method | |
| CN103063120B (en) | Flange coaxiality detection measuring tool | |
| KR20130010290A (en) | Digital excore nuclear instrumentation system having thermal power automatic amending function | |
| CN105823532A (en) | Mobile flow online calibrating system | |
| CN111982555A (en) | Hydrogenation machine test platform | |
| CN205642568U (en) | Online calibration system of portable flow | |
| CN105203190A (en) | Calibration method for mass flowmeter and gas flowmeter using calibration method | |
| CN108490870A (en) | A kind of method of Intelligent fire-fighting test run platform and its implementing monitoring | |
| CN208654615U (en) | A kind of Intelligent fire-fighting test run platform | |
| CN114812651A (en) | Intelligent monitoring and early warning system for operation safety of instrument and meter based on sensor technology | |
| CN117521436A (en) | Dynamic risk assessment method and system for gas gathering station | |
| CN113571215A (en) | Heat exchange water tank liquid level measurement system and method and nuclear power plant PCS system | |
| CN106959194A (en) | Leakage monitoring method for bolted flange joints | |
| CN203745049U (en) | Calibration device of gas precision flow meter | |
| CN220926856U (en) | Online carbon potential monitoring system with double-control instrument of dioxygen probe | |
| CN219347607U (en) | Special gauge for distance from circle center to end face | |
| CN206710035U (en) | Leakage monitor for bolted flange joints | |
| CN213984810U (en) | Installation and inspection tool for nuclear-grade rotating speed detector of main pump of nuclear power plant | |
| CN219273937U (en) | Mounting device for pipeline purging acceptance inspection equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |