CN116481712B - Method for detecting pressure source by using online pressure gauge - Google Patents
Method for detecting pressure source by using online pressure gauge Download PDFInfo
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- CN116481712B CN116481712B CN202310735939.1A CN202310735939A CN116481712B CN 116481712 B CN116481712 B CN 116481712B CN 202310735939 A CN202310735939 A CN 202310735939A CN 116481712 B CN116481712 B CN 116481712B
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- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000009434 installation Methods 0.000 claims abstract description 28
- 230000008439 repair process Effects 0.000 claims description 43
- 238000012937 correction Methods 0.000 claims description 36
- 238000004364 calculation method Methods 0.000 claims description 11
- 238000001514 detection method Methods 0.000 abstract description 4
- 238000004886 process control Methods 0.000 description 13
- 238000004519 manufacturing process Methods 0.000 description 12
- 230000006872 improvement Effects 0.000 description 9
- 238000012795 verification Methods 0.000 description 8
- 230000006978 adaptation Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L27/00—Testing or calibrating of apparatus for measuring fluid pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention discloses a method for detecting a pressure source by utilizing an online pressure gauge, which belongs to the technical field of instrument detection and is applied to a pressure gauge group under the same pressure source; the pressure gauge group comprises three or more pressure gauges; comprising the following steps: recording the pressure indication value of each pressure gauge in the pressure gauge group at the same time, and simultaneously recording the temperature at the time; judging whether all the pressure gauges in the pressure gauge group meet the use requirement or not through the pressure indication values, if so, judging whether the pressure indication values of all the pressure gauges in the pressure gauge group are within the pressure source allowable range of the pressure gauge installation part or not; and if the pressure indication value of the pressure gauge is out of the range, the pressure source is considered to be out of the service requirement. The invention judges whether the pressure source meets the use requirement on line through the pressure indication value of the pressure gauge group under the same pressure source, and can judge the conformity of the pressure source without closing the pressure source.
Description
Technical Field
The invention belongs to the field of instrument detection, and particularly relates to a method for detecting a pressure source by using an online pressure gauge.
Background
The pressure gauge is widely applied to aspects of production and life, technical research and development, safety protection and the like, and is a metering device for safety protection listed in the metering device catalogue of forced management, and the verification period of the pressure gauge is generally not more than 6 months according to the verification rule requirement. And the pressure gauge which is unqualified and continuously used can have adverse effects on various aspects such as enterprise production.
In order to facilitate detection on an online pressure gauge, the inventor finds out an online pressure gauge detection method, and can detect the effectiveness of a pressure gauge group under the same pressure source without disassembling the pressure gauge. However, in practical application, it has been found that the pressure indication value of the pressure gauge fluctuates due to errors of the pressure gauge, and the pressure source may also fluctuate. However, the pressure source cannot display the pressure value, in the prior art, whether the pressure source meets the use requirement is difficult to judge, and only after the non-meeting item appears, the pressure source is closed, and whether the pressure source meets the use requirement is judged by checking the non-meeting reason one by one.
Disclosure of Invention
In view of the above, the present invention provides a method for detecting a pressure source by using an online pressure gauge, and whether the pressure source meets the use requirement is determined online by an accessed pressure gauge group under the pressure source.
In order to solve the technical problems, the technical scheme of the invention is that a method for detecting a pressure source by utilizing an online pressure gauge is adopted and is applied to a pressure gauge group under the same pressure source; the pressure gauge group comprises three or more pressure gauges; the method is characterized by comprising the following steps:
recording the pressure indication value of each pressure gauge in the pressure gauge group at the same time, and simultaneously recording the temperature at the time;
judging whether all the pressure gauges in the pressure gauge group meet the use requirement or not through the pressure indication values, if so, judging whether the pressure indication values of all the pressure gauges in the pressure gauge group are within the pressure source allowable range of the pressure gauge installation part or not; and if the pressure indication value of the pressure gauge is out of the range, the pressure source is considered to be out of the service requirement.
As an improvement, the method for calculating the allowable range of the pressure source comprises the following steps:
using the formula
∆ YUpper limit value ＝y Repair tool ＋y Upper difference of ＋（|V Allow for |＋|V Warm temperature |）
Calculating the upper limit value of the allowable range of the pressure source at the pressure gauge,
using the formula
∆ YLower limit value ＝y Repair tool －y Lower difference －（|V Allow for |＋|V Warm temperature |）
Calculating a lower limit value of a pressure source allowable range at the pressure gauge, wherein∆ YUpper limit value Is the upper limit value of the pressure source,∆ Ylower limit value Is the lower limit value of the pressure source,y repair tool The corrected measured value of the pressure gauge is used,y upper difference of For an upper difference in the pressure value of the pressure source,y lower difference As the difference in the pressure value of the pressure source,V allow for As a basic allowable error value of the pressure gauge,V warm temperature The pressure indication error allowable value is introduced when the ambient temperature deviates from 20+/-5 ℃.
As a further improvement, the formula is used
V iWarm temperature ＝ F i ×L i
Calculating the allowable value of pressure indication value error introduced by the pressure gauge when the ambient temperature deviates from 20+/-5℃, whereinV iWarm temperature Is the allowable value of the error of the pressure indication value when the ambient temperature deviates from 20+/-5 ℃,F i the error allowance coefficient of the indication value of the pressure gauge when the ambient temperature deviates from 20+/-5 ℃;L i the measuring range of the pressure gauge;
using the formula
F ＝±K∆t
Calculating a pressure indication error allowance coefficient of the pressure gauge when the ambient temperature deviates from 20+/-5℃, whereinFThe error of the indication of the pressure allows for a coefficient,Kis a temperature influence coefficient; go (L)t=∣t 2 －t 1 ∣，∆tIs a degree deviated from 20+/-5 ℃;t 2 is at ambient temperature and whent 2 At a temperature of more than 25 deg.c,t 1 25 ℃; when (when)t 2 At a temperature of less than 15 deg.c,t 1 15 ℃;
using the formula
V iAllow for ＝v iAllow for ×L i
Calculating a pressure gauge base allowable error value, whereinV iAllow for In order to substantially allow for an error value,v iallow for As a basic coefficient of error that is allowed,L i is the measuring range of the pressure gauge;
using the formula
y i repair ＝y i shows +y i correction value
Calculating corrected measured values of the pressure gauge, wherein y i repair Corrected measured value for pressure gauge, y i shows For indicating the pressure of the pressure gauge, y i correction value And obtaining a correction value for the pressure gauge according to the corresponding tracing certificate, wherein the correction value is a negative indication error.
As another further improvement, if the pressure value of the pressure gauge under the pressure source is within the allowable range of the pressure source at the installation position of the pressure gauge, judging whether the pressure value of the pressure gauge is within the reliable fluctuation range; the upper limit of the reliable fluctuation range is the pressure of the pressure source when the pressure gauge is just installed plus the error allowable value of the pressure representation value, and the lower limit is the pressure source when the pressure gauge is just installed minus the error allowable value of the pressure representation value; the indication error allowable value is the superposition of the basic allowable error range of the pressure gauge and the pressure indication error range introduced when the ambient temperature deviates from 20+/-5 ℃;
if the judgment result is not in the reliable fluctuation range, verifying the judgment result, wherein the method for verifying the judgment result comprises the following steps:
replacing any pressure gauge in the pressure gauge group by using a qualified standby pressure gauge, wherein the qualified standby pressure gauge is consistent with the range, the precision grade and the graduation value of the replaced pressure gauge;
Calculating a pressure value of a pressure source at the installation position of the pressure gauge by using the sum of the pressure indication value of the qualified standby pressure gauge and the correction value of the standby pressure gauge;
judging whether the difference between the pressure indication value of the replaced pressure gauge and the pressure value of the pressure source at the installation position of the pressure gauge is within the allowable range of the indication value error; the indication error allowable value range is the superposition of a basic allowable error range and a pressure indication error range introduced when the ambient temperature deviates from 20+/-5 ℃;
if the pressure source pressure is within the range, calculating a pressure source pressure predicted value of the installation position of each pressure gauge according to the pressure source pressure of the installation position of the qualified standby pressure gauge and the pressure difference between the pressure source pressure and each pressure gauge;
comparing the pressure predicted value of the pressure source at the installation position of each pressure gauge with the pressure indication value of each pressure gauge, and if the difference between the pressure indication value and the pressure predicted value of the pressure source exceeds the allowable value range of the indication error, the pressure source does not meet the use requirement.
As an improvement, the pressure of the pressure source at the installation position of the pressure gauge is a corrected pressure indication value obtained when the pressure gauge is just installed, and the calculation method is the sum of the pressure indication value obtained when the pressure gauge is just installed and the correction value of the pressure gauge.
As an improvement, the method for judging whether all pressure gauges in the pressure gauge group meet the use requirement or not through the pressure indication value comprises the following steps:
Each pressure gauge in the pressure gauge group is connected with other pressure gauges in the same pressure gauge group in pairs, and two pressure gauges which are connected are established as a pressure gauge group;
judging whether the difference between the pressure indicating value of the pressure gauge and the corrected measured value obtained when the pressure gauge is just installed is within the range of an indicating value error allowable value; the indication error allowable value range is the superposition of a basic allowable error range and a pressure indication error range introduced when the ambient temperature deviates from 20+/-5 ℃;
if yes, judging whether the difference between the pressure indication values of two pressure gauges in the pressure gauge group exceeds the allowable fluctuation range, and if yes, at least one pressure gauge in the pressure gauge group does not meet the use requirement; the pressure indication value difference of the pressure gauge group is the pressure indication value difference of two pressure gauges in the pressure gauge group at the same time.
As an improvement, the calculation method of the allowable fluctuation range of the pressure indication value difference of the two pressure gauges in the pressure gauge group comprises the following steps:
using the formula
∆ I ＝∆ iRepair tool ±（V Allow and sum ＋V Mild ）
Calculating the upper limit and the lower limit of the fluctuation range allowed by the difference between the pressure indication values of two pressure gauges in the pressure gauge group, wherein∆ I An upper limit and a lower limit of fluctuation allowed for the difference of the pressure indication values of the pressure gauge group,∆ irepair tool For the difference between the corrected measured values of the two pressure gauges in the pressure gauge set, V Allow and sum The sum of absolute values of basic allowable errors of two pressure gauges in the pressure gauge group,V Mild the absolute value sum of pressure indication errors introduced when the ambient temperature deviates from 20+/-5 ℃ for two pressure gauges in the pressure gauge group;
using the formula
∆ i repair ＝y i repair －y i+n repair
Calculating the difference between the corrected measured values of the two pressure gauges, wherein father i repair For the difference between corrected measured values of two pressure gauges, y i repair For a corrected measured value, y, of one of the pressure gauges i+n And the corrected measured value of the other pressure gauge is corrected.
As an improvement, when the difference between the pressure indication values of the pressure gauge groups exceeds the allowable fluctuation range, the repeated pressure gauges in the pressure gauge groups are the pressure gauges which are suspected to be out of compliance with the use requirement.
As an improvement, the method for judging whether all pressure gauges in the pressure gauge group meet the use requirement or not through the pressure indication value further comprises a method for verifying the judgment result; the method for verifying the judgment result comprises the following steps:
replacing the pressure gauge which is suspected to be out of compliance with the use requirement by using a qualified standby pressure gauge, wherein the qualified standby pressure gauge is consistent with the measuring range, the precision grade and the graduation value of the pressure gauge which is suspected to be out of compliance with the use requirement;
Calculating a corrected measured value by using the sum of the pressure indication value of the qualified standby pressure gauge and the correction value obtained by the traceability certificate corresponding to the standby pressure gauge;
judging whether the difference between the qualified standby pressure gauge and the pressure indicating value of the pressure gauge connected with the standby pressure gauge exceeds the allowable fluctuation range, and if the difference does not exceed the allowable fluctuation range, indicating that the pressure gauge suspected of not meeting the use requirement cannot meet the use requirement.
As an improvement, after judging that the pressure gauge suspected of not meeting the use requirement cannot meet the use requirement, calculating the predicted value of each pressure gauge according to the corrected measured value of the qualified standby pressure gauge and the pressure difference between each pressure gauge;
and comparing the predicted value of each pressure gauge with the pressure indication value of each pressure gauge, and if the difference between the pressure indication value and the predicted value exceeds the allowable range of the indication error, failing to meet the use requirement of the pressure gauge.
The invention has the advantages that:
when judging that the pressure indication values of the pressure gauges in the pressure gauge group under the same pressure source meet the requirements of safety protection or process control, the invention knows whether the pressure value of the pressure source at the pressure gauge meets the requirements of safety protection or process control or not through the relation among the pressure indication values of the pressure gauges arranged at the corresponding positions of the pressure source. Because the pressure source cannot display the pressure value, the invention obtains the pressure value of the pressure source through the pressure indication value displayed by each pressure gauge arranged at each corresponding position of the pressure source.
By observing and recording the corrected measured value of each qualified pressure gauge of the pressure gauge group in the conventional production state, namelyy Repair tool Using corrected measured values of the pressure gauge onlyy Repair tool Pressure source in compliance with safety or process controly Upper difference of /y Lower difference Basic allowable error value with the pressure gaugeV Allow for Error of pressure indication value introduced when ambient temperature deviates from 20+/-5 DEG CV Warm temperature Is used for calculating the scope of the pressure source Y conforming to the safety protection or the process control Y Therefore, the effectiveness of the pressure source is judged online, and the pressure source does not need to be closed.
Drawings
FIG. 1 is a flow chart of the present invention.
Description of the embodiments
In order to make the technical scheme of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the following specific embodiments.
The qualified pressure gauge and the qualified standby pressure gauge refer to pressure gauges which are qualified by legal metering verification institutions with qualification and are stored completely in the effective period.
In addition, when the pressure gauge is just installed, the pressure indication value of the "qualified pressure gauge" or the "qualified standby pressure gauge" can be considered to be the closest to the actual pressure value after being corrected by the correction value, so that the pressure source value at one pressure gauge is considered to be the corrected pressure indication value obtained when the pressure gauge is just installed in the invention, and the calculation method is the sum of the pressure indication value obtained when the pressure gauge is just installed and the correction value of the pressure gauge. The correction value of the pressure gauge in the invention refers to the correction value obtained through the tracing certificate of the pressure gauge, the correction value is derived from the indication error on the tracing certificate, and the correction value is a negative indication error. The present invention, therefore, will be described in terms of the principles described above.
As shown in fig. 1, the present invention provides a method for detecting a pressure source by using an online pressure gauge, which is applied to a pressure gauge group under the same pressure source; the pressure gauge group comprises three or more pressure gauges; the method comprises the following specific steps:
s1, recording pressure indication values of each pressure gauge in the pressure gauge group at the same time, and simultaneously recording the temperature at the time.
And recording the pressure indication value and the current temperature of each pressure gauge at a certain moment in the conventional production state.
S2, judging whether all pressure gauges in the pressure gauge group meet the use requirement or not through the pressure indication values, and judging whether the pressure indication values of all the pressure gauges in the pressure gauge group are within the allowable range of a pressure source at the pressure gauge if the pressure indication values meet the use requirement; and if the pressure indication value of the pressure gauge is out of the range, the pressure source is considered to be out of the service requirement.
The method for judging whether all the pressure gauges in the pressure gauge group meet the use requirement through the pressure indication value is another set of content, and the invention will be described in detail later. Firstly, judging whether the pressure gauge meets the use requirement or not aims at avoiding misjudgment of a pressure source caused by the problem of the pressure gauge, so that interference of the pressure gauge is firstly eliminated.
After eliminating the interference caused by the pressure gauge problem, continuously judging whether the pressure indication values of all the pressure gauges in the pressure gauge group are within the allowable range of the pressure source pressure value at the pressure gauge, namelyy Showing the ＞∆ Y Upper limit or valuey Showing the ＜∆YAnd when the lower limit value is reached, the pressure source is not in accordance with the requirements of safety protection or process control.
The upper and lower limit calculation method of the pressure source pressure value allowable range is as follows:
using the formula
∆ Upper limit value of Y ＝y Repair tool ＋y Upper difference of ＋（|V Allow for |＋|V Warm temperature |）
Calculating the upper limit value of the allowable range of the pressure source at the pressure gauge,
using the formula
∆ Lower limit value of Y ＝y Repair tool －y Lower difference －（|V Allow for |＋|V Warm temperature |）
Calculating a lower limit value of a pressure source allowable range at the pressure gauge, wherein∆ YUpper limit value Is the upper limit value of the pressure source,∆ Ylower limit value Is the lower limit value of the pressure source,y repair tool The corrected measured value of the pressure gauge is used,y upper difference of For an upper difference in the pressure value of the pressure source,y lower difference As the difference in the pressure value of the pressure source,V allow for As a basic allowable error value of the pressure gauge,V warm temperature The pressure indication error allowable value is introduced when the ambient temperature deviates from 20+/-5 ℃.
Wherein the upper and lower differences of the pressure value of the pressure source are determined by pressureThe force source is provided by the user. Ideally, the pressure source meets the use requirement by eliminating the error of the pressure gauge and only by the difference between the pressure indication value of the pressure gauge and the pressure value of the pressure source at the position not exceeding the upper and lower differences of the pressure values of the pressure source, but the pressure indication value of the pressure gauge is actually biased, so the invention also introduces the basic allowable error value of the pressure gauge only V Allow for Error of pressure indication value introduced when ambient temperature deviates from 20+/-5 DEG CV Warm temperature Is used for calculating the safety protection or process control range of the pressure source Y according to the multiparty relation∆ Y 。
∆ Y The specific calculation steps of (a) are as follows:
first, using the formula
y i repair ＝y i shows +y i correction value
Calculating corrected measured values of the pressure gauge, wherein y i repair Corrected measured value for pressure gauge, y i shows For indicating the pressure of the pressure gauge, y i correction value The correction value obtained for the pressure gauge according to the corresponding tracing certificate is a negative indication error;
reuse formula
V iWarm temperature ＝ F i ×L i
Calculating the allowable value of pressure indication value error introduced by the pressure gauge when the ambient temperature deviates from 20+/-5 ℃, wherein V iWarm temperature Is the allowable value of the error of the pressure indication value when the ambient temperature deviates from 20+/-5 ℃,F i the error allowance coefficient of the indication value of the pressure gauge when the ambient temperature deviates from 20+/-5 ℃;L i the measuring range of the pressure gauge;
using the formula
F ＝±K∆t
Calculating a pressure indication error allowance coefficient of the pressure gauge when the ambient temperature deviates from 20+/-5℃, whereinFThe error of the indication of the pressure allows for a coefficient,Kis a temperature influence coefficient; go (L)t=∣t 2 －t 1 ∣，∆tIs a degree deviated from 20+/-5 ℃;t 2 is at ambient temperature and whent 2 At a temperature of more than 25 deg.c,t 1 25 ℃; when (when)t 2 At a temperature of less than 15 deg.c, t 1 15 ℃;
using the formula
V iAllow for ＝v iAllow for ×L i
Calculating a pressure gauge base allowable error value, whereinV iAllow for In order to substantially allow for an error value,v iallow for As a basic coefficient of error that is allowed,L i is the range of the pressure gauge.
And finally, the parameters are brought into an upper limit formula and a lower limit formula to obtain the pressure source pressure value of the pressure source pressure value allowable range.
S3, if the pressure value of the pressure gauge under the pressure source is within the allowable range of the pressure source at the installation position of the pressure gauge, judging whether the pressure value of the pressure gauge is within the reliable fluctuation range; the upper limit of the reliable fluctuation range is the pressure of the pressure source when the pressure gauge is just installed plus the error allowable value of the pressure representation value, and the lower limit is the pressure source when the pressure gauge is just installed minus the error allowable value of the pressure representation value; the indication error allowable value is the superposition of the basic allowable error range of the pressure gauge and the pressure indication error range introduced when the ambient temperature deviates from 20+/-5 ℃;
although it is already possible to determine whether the pressure source is within the allowable range according to the determination of step 2, so as to determine whether the pressure source meets the use requirement, for the purpose of stabilizing and reliability of the pressure source, the present invention can further determine the effectiveness of the pressure source by continuously determining whether the pressure indication value of the pressure gauge is within the reliable fluctuation range.
The reliable fluctuation range is the superposition of the basic allowable error range of the pressure source pressure + -the pressure gauge when the pressure gauge is just installed and the pressure indication error range introduced when the ambient temperature deviates from 20 ℃ + -5 ℃; the method can calculate the upper limit and the lower limit of the reliable fluctuation range.
According to the description, the pressure source value at the installation place of the pressure gauge is considered as a corrected pressure indication value obtained when the pressure gauge is just installed in the invention, and the calculation method is the sum of the pressure indication value obtained when the pressure gauge is just installed and the correction value of the pressure gauge.
Through the judgment, if the pressure indication value of the pressure gauge is in a reliable fluctuation range, the pressure source is considered to be stable and reliable.
And S4, if the judgment result is not in the reliable fluctuation range, verifying the judgment result. For the case that the judgment result is not within the reliable range, the invention can further verify to know whether the pressure gauge or the pressure source is in particular problematic.
The method for verifying the judgment result comprises the following steps:
s41, replacing any pressure gauge in the pressure gauge group by using a qualified standby pressure gauge, wherein the qualified standby pressure gauge is consistent with the range, the precision grade and the graduation value of the replaced pressure gauge;
S42, calculating the pressure value of the pressure source at the pressure gauge by using the sum of the pressure indication value of the qualified standby pressure gauge and the correction value of the standby pressure gauge. After the qualified standby pressure gauge is connected to a pressure source, a new pressure indication value is generated. The pressure indication value and the table correction value are used to calculate the pressure value of the pressure source at the pressure gauge again, and the specific calculation method is described in the above steps and is not repeated here.
S43, judging whether the difference between the pressure indication value of the replaced pressure gauge and the pressure value of the pressure source at the pressure gauge is within the allowable range of indication value error; the indication error allowable value range is the superposition of a basic allowable error range and a pressure indication error range introduced when the ambient temperature deviates from 20+/-5 ℃; if the error is not within the allowable range, the problem of the pressure gauge is also described.
S44, if the pressure is within the range, calculating a predicted value of each pressure gauge mounting position according to the pressure source pressure of the qualified standby pressure gauge and the pressure difference between each pressure gauge; after the qualified standby pressure gauge is replaced, the validity of the rest pressure gauges in the pressure gauge group can be verified.
The pressure difference between each pressure gauge can be considered constant in the same stable pressure source. After the corrected measured value of the new qualified pressure gauge is calculated, the pressure predicted value of the pressure source at the installation position of each pressure gauge can be calculated according to the pressure difference between the pressure gauges. The method is used for verifying the effectiveness of other pressure gauges by utilizing the principle.
S45, comparing the pressure predicted value of the pressure source at the installation position of each pressure gauge with the pressure indication value of each pressure gauge, and if the difference between the pressure indication value and the pressure predicted value of the pressure source exceeds the allowable value range of the indication value error, failing to meet the use requirement of the pressure source.
After the predicted value of the pressure source pressure at the installation position of each table is calculated, the predicted value is compared with the pressure indication value of each table, and if the pressure source pressure exceeds the allowable value range of the indication value error of the pressure table, the table is considered to be not in accordance with the use requirement.
The key point of the method is that the pressure source cannot display the pressure value, the pressure value of the pressure source can be obtained only through the pressure indication value displayed by each pressure gauge arranged at each corresponding position of the pressure source, the pressure source has slight fluctuation in the use process, and although customers have relevant records in the fluctuation range, when the pressure indication value of the pressure gauge is displayed inaccurately, enterprises cannot know whether the pressure value of the used pressure source meets the safety protection or process control requirements. The method can not only utilize corrected measured values of pressure gauges on the same pressure sourcey Repair tool Determining an upper limit value of a pressure source conforming to safety protection or process control according to the upper limit value y Upper difference of Lower limit valuey Lower difference Calculate the range of the pressure source Y∆ Y The pressure indication value of each pressure gauge can be usedy Showing the Range with pressure source Y∆ Y The relation between the pressure source and the pressure pipeline can judge whether the pressure source meets the requirements of safety protection or process control, so that the problem of whether the pressure source or the pressure meter is rapidly and effectively checked, the problem of checking the pressure source or the pressure meter one by one in various aspects such as pressure supply equipment, pressure pipelines and the like can be avoided, the time for checking faults is saved to a great extent, and powerful guarantee is provided for efficient production of enterprises.
In addition, the invention also relates to a method for judging whether all pressure gauges in the pressure gauge group accord with the use requirement or not through the pressure indication value, and the method comprises the following specific steps:
s11, carrying out two-by-two connection on each pressure gauge in the pressure gauge group under the same pressure source and other pressure gauges, and establishing two pressure gauges which are connected as a pressure gauge group.
The combination is a pressure gauge combination used for judging whether the difference between the pressure indication values of the two pressure gauges exceeds the allowable fluctuation range or not at a later stage. Each pressure gauge should be at least in tandem with two other pressure gauges within the cluster. For accurate results, each pressure gauge preferably establishes a simultaneous relationship with all other pressure gauges in the cluster. According to the invention, each pressure gauge in the pressure gauge group is numbered according to the principle of being convenient for observing and recording the pressure indication value of the pressure gauge, then the pressure gauges are connected with other pressure gauges one by one according to the number, and the repeated pressure gauge group is deleted.
S12, recording the pressure indication value of each pressure gauge in the pressure gauge group at the same time, and simultaneously recording the temperature at the time.
And recording the pressure indication value and the current temperature of each pressure gauge at a certain moment in the conventional production state.
S13, judging whether the difference between the pressure indication value of the pressure gauge and the corrected measured value obtained when the pressure gauge is just installed is within the allowable value range of the indication value error of the pressure gauge, if yes, continuously judging whether the difference between the pressure indication values of two pressure gauges in the pressure gauge group where the pressure gauge is located exceeds the allowable fluctuation range, and if yes, at least one pressure gauge in the pressure gauge group does not meet the use requirement; the pressure indication value difference of the pressure gauge group is the pressure indication value difference of two pressure gauges in the pressure gauge group at the same time. When the difference between the pressure indication values of the pressure gauge groups exceeds the allowable fluctuation range, the repeated pressure gauges in the pressure gauge groups are the pressure gauges which are suspected to be out of compliance with the use requirement.
It is determined whether the difference between the pressure indication value of the pressure gauge and the corrected measured value obtained at the time of the installation of the pressure gauge is within the allowable value range of the indication value error of the pressure gauge, and the purpose is to have a simple preliminary determination of the compliance of the pressure gauge. If the difference between the pressure indication value and the corrected measured value obtained at the time of the installation of the pressure gauge exceeds the allowable value range of the indication value error, the pressure gauge is highly likely to fail and not meet the use requirement.
The pressure gauge is considered to be closest to the actual pressure value when it is just installed, after the pressure indication value is corrected by the correction value. The result of the comparison of the pressure indication with the measured value that has just been corrected at the time of installation at the pressure gauge can thus be used as an indicator of the preliminary determination.
In addition, the indication error allowable value range is the superposition of the basic allowable error range and the pressure indication error range introduced when the ambient temperature deviates from 20+/-5 ℃.
In the invention, the method for acquiring the corrected measured value acquired during the just-installed state at the installation position of the pressure gauge comprises the following steps:
firstly, respectively installing qualified pressure gauges on corresponding positions of pressure sources, reading pressure indication values of the pressure gauges, and correcting the pressure indication values by utilizing the pressure indication values of the pressure gauges and correction values obtained by corresponding tracing certificates.
In the invention, the calculation method of the fluctuation range allowed by the difference between the pressure indication values of two pressure gauges in the pressure gauge group comprises the following steps:
using the formula
∆ I =∆ iRepair tool ±（V Allow and sum ＋V Mild ）
Calculating the upper limit and the lower limit of the fluctuation range allowed by the difference between the pressure indication values of two pressure gauges in the pressure gauge group, wherein∆ I An upper limit and a lower limit of fluctuation allowed for the difference of the pressure indication values of the pressure gauge group,∆ irepair tool For the difference between the corrected measured values of the two pressure gauges in the pressure gauge set, V Allow and sum The sum of absolute values of basic allowable errors of two pressure gauges in the pressure gauge group,V Mild the sum of absolute values of pressure indication errors introduced by two pressure gauges in the pressure gauge group when the ambient temperature deviates from 20+/-5 ℃.
First, it is necessary to use the formula
y i repair ＝y i shows ＋y i correction value
Calculating corrected measured values of the pressure gauge, wherein y i repair Corrected measured value for pressure gauge, y i shows For indicating the pressure of the pressure gauge, y i correction value And obtaining a correction value for the pressure gauge according to the corresponding tracing certificate, wherein the correction value is a negative indication error.
Further, the formula is utilized in the present invention
∆ i repair ＝y i repair －y i+n repair
Calculating the difference between the corrected measured values of the two pressure gauges, wherein father i repair For the difference between corrected measured values of two pressure gauges, y i repair For a corrected measured value, y, of one of the pressure gauges i+n repair A corrected measured value for the other pressure gauge;
reuse formula
V iWarm temperature ＝ F i ×L i
Calculating a pressure indication error allowable value introduced by the temperature of the pressure gauge when the ambient temperature deviates from 20+/-5 ℃, wherein V iWarm temperature Is the allowable value of the error of the pressure indication value when the ambient temperature deviates from 20+/-5 ℃,F i the error allowance coefficient of the indication value of the pressure gauge when the ambient temperature deviates from 20+/-5 ℃; L i The measuring range of the pressure gauge;
using the formula
F ＝±K∆t
Calculating the error allowance coefficient of the pressure indication value of the pressure gauge when the ambient temperature deviates from 20+/-5℃, wherein the error allowance coefficient isFThe error of the indication of the pressure allows for a coefficient,Kis a temperature influence coefficient; go (L)t＝∣t 2 －t 1 ∣，∆tIs a degree deviated from 20+/-5 ℃;t 2 is at ambient temperature and whent 2 At a temperature of more than 25 deg.c,t 1 25 ℃; when (when)t 2 At a temperature of less than 15 deg.c,t 1 15 ℃.
Using the formula
V iAllow for ＝v iAllow for ×L i
Calculating a pressure gauge base allowable error value, whereinV i allow In order to substantially allow for an error value,v iallow for As a basic coefficient of error that is allowed,L i is the range of the pressure gauge.
Because each pressure gauge is at least combined with two other pressure gauges to form a pressure gauge group, when a problem occurs in a certain pressure gauge, the difference between the pressure indication value of one pressure gauge and the pressure indication value of at least one pressure gauge group exceeds the allowable fluctuation range. In this case, it is first necessary to look at which pressure gauge in several pressure gauge groups is repeated, and then the pressure gauge is highly likely to be out of compliance with the use requirement.
S14, verifying a judging result.
The pressure indication value difference of a plurality of pressure gauge groups participated in by a certain pressure gauge exceeds the allowable fluctuation range, so the pressure gauge is regarded as the pressure gauge which is suspected to be out of compliance with the use requirement. Next, verification can also be performed by the following method.
S141, replacing a pressure gauge suspected of not meeting the use requirement by using a qualified standby pressure gauge, wherein the qualified pressure gauge is consistent with the measuring range, the precision grade and the graduation value of the pressure gauge suspected of not meeting the use requirement;
s142, calculating corrected measured values by using the sum of the pressure indication value of the qualified standby pressure gauge and the correction value obtained by the traceability certificate corresponding to the standby pressure gauge. After the qualified standby pressure gauge is connected to a pressure source, a new pressure indication value is generated. The corrected measured value of the table is calculated again by using the pressure indication value and the table correction value, and the specific calculation method is described in the above steps, and will not be described here again.
S143, judging whether the difference between the qualified standby pressure gauge and the pressure indication value of the pressure gauge connected with the standby pressure gauge exceeds the allowable fluctuation range, and if the difference does not exceed the allowable fluctuation range, indicating that the pressure gauge suspected of not meeting the use requirement cannot meet the use requirement.
And (3) recalculating the pressure indication value difference and the allowable fluctuation range of the pressure gauge group participated by the qualified standby pressure gauge, and judging whether the pressure indication value difference is within the allowable fluctuation range or not again, if so, indicating that the pressure gauge suspected to be out of compliance with the use requirement cannot meet the use requirement.
S144, calculating the predicted value of each pressure gauge according to the corrected measured value of the qualified standby pressure gauge and the pressure difference between each pressure gauge.
After the qualified standby pressure gauge is replaced, the validity of the rest pressure gauges in the pressure gauge group can be verified.
The pressure difference between each pressure gauge can be considered constant in the same stable pressure source. After the corrected measured value of the new qualified pressure gauge is calculated, the pressure predicted value of the pressure source at the installation position of each pressure gauge can be calculated according to the pressure difference between the pressure gauges. The method is used for verifying the effectiveness of other pressure gauges by utilizing the principle.
S145, comparing the pressure predicted value of the pressure source at the installation position of each pressure gauge with the pressure indication value of each pressure gauge, and if the difference between the pressure indication value and the pressure predicted value of the pressure source exceeds the allowable range of the indication value error, not conforming to the use requirement of the pressure gauge.
After the pressure of the pressure source at the installation position of each meter is calculated, the pressure source is compared with the pressure indication value of each meter, and if the pressure source exceeds the allowable value range of the indication value error of the pressure meter, the meter is considered to be not in accordance with the use requirement.
The invention is illustrated in detail below by way of examples.
Examples
The pressure gauges for safety protection and process control are installed on a certain production line of a certain enterprise, and have important indication and display functions, and whether the pressure indication values of the pressure gauges meet the requirements of the safety protection and process control of the enterprise or not has important functions for the enterprise. The pressure on the whole production line comes from the same relatively stable pressure source, the flow direction of the pressure source is single, firstly, the pressure supply equipment of the hydraulic station (the pressure gauge (1) is arranged on the hydraulic equipment), the pressure provided by the hydraulic equipment is conveyed to the filter (the pressure gauge (2) is arranged on the filter) through the pipeline, and the pressure is conveyed to the front section (the pressure gauge (3) is arranged on the front section) of the production line, the middle section (the pressure gauge (4) is arranged on the middle section) of the production line and the end section (the pressure gauge (5) is arranged on the end section) of the production line after the pressure is filtered. The measuring ranges of the tables (1) to (5) are (0-2.5) MPa, the precision grades are 1.6, and the graduation values are 0.05 MPa. The pressure gauge is used for safety protection 5. Measurement of the pressure of the sealed pressurized container, belongs to a pressure gauge for forced verification, and verification projects are executed according to rules.
As shown in the following table
The current temperature is: 17.3 ℃ and meets the requirement of the use environment temperature (20+/-5) DEG C of the pressure gauge. (note: when the ambient temperature of use of the pressure gauge is (20.+ -. 5) ℃ C.), V Warm temperature Is 0. )∆ Y An upper limit value of (2),∆ Y The lower limit value of (2) is set according to the upper limit value of the pressure source provided by the pressure source using the customery Upper difference of 0.09 MPa, lower limit valuey Lower difference 0.08 And calculating the pressure indication value of the MPa and the pressure gauge. Because the pressure indication value of the pressure gauge can change in use, according to the rule requirement, the indication value error of the pressure gauge can not exceed the basic allowable error value, so∆ Y Dividing the upper and lower values of (1) by the upper value of the considered pressure sourcey Upper difference of Lower limit valuey Lower difference The basic allowable error value of the pressure gauge pressure indication value should also be considered, and is + -0.04 MPa in combination with the requirements of the regulations. Therefore:
∆ upper limit value of Y Corrected measured value of the pressure gaugey Repair tool Upper limit value of +pressure sourcey Upper difference of ++ (absolute value of basic allowable error value of the pressure gauge)V Allow for + absolute value of pressure indication error allowable value introduced by pressure gauge when ambient temperature deviates from 20+/-5 DEG CValue ofV Warm temperature ）＝y Repair 1 ＋y Upper difference of ＋（∣V Allow for ∣＋∣V Warm temperature ∣）＝1.33 MPa＋0.09 MPa＋（0.04 MPa＋0.00 MPa）＝1.46 MPa
∆ Lower limit value of Y Corrected measured value of the pressure gaugey Repair tool Lower limit value of the pressure sourcey Lower difference Absolute value of basic allowable error value of the pressure gaugeV Allow for Absolute value of error allowance of pressure indication value introduced by the pressure gauge when ambient temperature deviates from 20+/-5 DEG C V Warm temperature ）＝［y Repair 1 －y Lower difference －（∣V Allow for ∣＋∣V Warm temperature ∣）］＝1.33 MPa－［0.08 MPa＋（0.04 MPa＋0.00 MPa）］＝1.21 MPa
∆ Y 1 Is defined in the following range: 1.21 MPa to 1.46 MPa
Calculated according to the method∆ Y2 ～∆ Y5 The results are as follows:
∆ Y 2 is defined in the following range: 1.20 MPa to 1.45 MPa
∆ Y 3 Is defined in the following range: 1.18 MPa to 1.43 MPa
∆ Y 4 Is defined in the following range: 1.16 MPa to 1.41 MPa
∆ Y 5 Is defined in the following range: 1.15 MPa to 1.40 MPa
The range of the pressure source meeting the production requirement is known from the pressure source usery Lower difference ＝0.08 MPa，y Upper difference of Because the pressure source cannot display the pressure value, the pressure value of the pressure source can be obtained only by the pressure indication value displayed by each pressure gauge arranged at each corresponding position of the pressure source, and the sum of the pressure indication values of the pressure gauges and the error allowable value of the pressure gauge is taken as the pressureReliable fluctuation range of the pressure value of the force source. It can be derived that:
the reliable fluctuation range of the pressure gauge value is the reliable fluctuation range of the pressure source= (the pressure gauge value just installed)y Showing the +correction value of the pressure gauge) ± allowable value of error of the pressure gauge
And because the pressure source pressure=the pressure value of the pressure gauge just installedy Showing the Correction value of the pressure gauge
Therefore: reliable fluctuation range of pressure gauge value = reliable fluctuation range of pressure source pressure = pressure source pressure ± allowable value of pressure gauge value error
Reliable fluctuation range of table (1) =reliable fluctuation range of pressure source pressure=1.33 mpa±0.04 MPa.
The reliable fluctuation range of the indication value of the table (1), namely, the reliable fluctuation range of the pressure source is: 1.29 MPa to 1.37 MPa
The range of reliable fluctuation of the values shown in table (2) to the range of reliable fluctuation of the values shown in table (5) was calculated as described above, and the results were as follows:
the reliable fluctuation range of the indication value of the table (2), namely the reliable fluctuation range of the pressure source pressure is:
1.28 MPa～1.36 MPa
the reliable fluctuation range of the indication value of the table (3), namely, the reliable fluctuation range of the pressure source is:
1.26 MPa～1.34 MPa
the reliable fluctuation range of the indication value of the table (4), namely the reliable fluctuation range of the pressure source pressure is:
1.24 MPa～1.32 MPa
the reliable fluctuation range of the indication value of the table (5), namely, the reliable fluctuation range of the pressure source is:
1.23 MPa～1.31 MPa。
as shown in the following table
When a certain inspection is performed, the pressure representation values in the pressure gauge group are changed, and the current temperature is as follows: 18.the temperature of 9 ℃ meets the requirement of the use environment temperature (20+/-5) DEG C of the pressure gauge, V Warm temperature Is 0. The pre-change and post-change pressure indications are shown in the following table:
firstly, judging whether all pressure gauges in a pressure gauge group meet the use requirement or not according to the pressure indication value, and obtaining each pressure gauge∆ iShowing the None of which exceeds its corresponding∆ I Range.
Continuously judging whether the pressure indication values of all the pressure gauges in the pressure gauge group are within the allowable range of the pressure source at the installation position of the pressure gauge, and obtaining each pressure gauge y Showing the None of which exceeds its corresponding∆ YLower limit value 。
Then judging whether the pressure indication value of the pressure gauge is in the reliable fluctuation range, and finding out that the pressure indication value is at the momenty Showing the The reliable fluctuation range of the pressure gauge value, namely the reliable fluctuation range of the pressure source pressure is exceeded, so that the pressure gauge pressure value or the pressure source pressure is not known to be problematic.
For further verification, the pressure control valve of the table (5) is closed, and the standby pressure gauge which is consistent with the measuring range, the precision grade and the graduation value of the table (5) and is qualified after verification and is stored completely in the effective period is replaced immediately at the position of the table (5), wherein the indication error on the tracing certificate is-0.01 MPa.
As shown in the following table
After the table (5) is replaced, the pressure control valve of the table (5) is opened, the indication value of the pressure is read again to be 1.22 MPa when the pressure source is stable, meanwhile, the prediction value of the pressure source at the position of the table (5) can be calculated according to the indication value error of the traceable certificate of the table (5) and the current indication value of the traceable certificate, wherein the prediction value of the pressure source is=1.22 MPa (-0.01 MPa) (=1.23 MPa), and further the indication value error of the table (5) before replacement=1.21 MPa-1.23 MPa= -0.02 MPa is calculated. It can be seen that the table (5) before being replaced does not have a situation that does not meet the use requirements.
The pressure source difference for each pressure gauge position is constant because the pressure source is constant. In order to further verify whether the pressure source has a problem, the pressure source is started, and after the pressure source is stable, the pressure values of the pressure sources at the positions of the tables (1) to (4) can be calculated according to the constant pressure difference value and the pressure value of the pressure source at the position of the table (5): table (1): 1.29 MPa; table (2): 1.28 MPa; table (3): 1.26 MPa; table (4): 1.24 And (5) MPa. From this, the error of the indication values of tables (1) to (5) before replacing table (5) can be calculated as: -0.02 MPa, -0.01 MPa. Before replacing the table (5), the tables (1) to (5) are not out of tolerance, and the displayed pressure indication value is reliable, so that the pressure source can be judged to be out of compliance with the requirements of safety protection or process control.
As shown in the following table
At this time, the pressure source should be readjusted, and after the pressure source is stable, the pressure indication values of the pressure gauges are read again, and the pressure indication values of the tables (1) to (5) are respectively: table (1): 1.32 MPa; table (2): 1.31 MPa; table (3): 1.29 MPa; table (4): 1.28 MPa; table (5): 1.27 And (5) MPa. The pressure indicating value of the pressure gauge after the pressure source is regulated and the pressure value of the pressure source meet the requirements of safety protection and process control, so that the enterprise can be ensured to normally develop related work.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that the above-mentioned preferred embodiment should not be construed as limiting the invention, and the scope of the invention should be defined by the appended claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and such modifications and adaptations are intended to be comprehended within the scope of the invention.
Claims (8)
1. A method for detecting a pressure source by using an online pressure gauge is applied to a pressure gauge group under the same pressure source; the pressure gauge group comprises three or more pressure gauges; the method is characterized by comprising the following steps:
recording the pressure indication value of each pressure gauge in the pressure gauge group at the same time, and simultaneously recording the temperature at the time;
judging whether all the pressure gauges in the pressure gauge group meet the use requirement or not through the pressure indication values, if so, judging whether the pressure indication values of all the pressure gauges in the pressure gauge group are within the pressure source allowable range of the pressure gauge installation part or not; if the pressure indication value of the pressure gauge is not in the range, the pressure source is considered to be inconsistent with the use requirement;
the method for calculating the allowable range of the pressure source comprises the following steps:
Using the formula
∆ Upper limit value of Y ＝y Repair tool ＋y Upper difference of ＋（|V Allow for |＋|V Warm temperature |）
Calculating the upper limit value of the allowable range of the pressure source at the pressure gauge,
using the formula
∆ Lower limit value of Y ＝y Repair tool －y Lower difference －（|V Allow for |＋|V Warm temperature |）
Calculating the lower limit value of the allowable range of the pressure source at the installation position of the pressure gauge, wherein the lower limit value is Upper limit value of Y Is the upper limit value of the pressure source pressure Lower limit value of Y Is the lower limit value of the pressure source pressure, y Repair tool Corrected measured value, y, for the pressure gauge Upper difference of Is the upper difference of the pressure value of the pressure source, y Lower difference Is the pressure value of the pressure source is lower than V Allow for V being the basic allowable error value of the pressure gauge Warm temperature The pressure indication error allowable value is introduced when the ambient temperature deviates from 20+/-5 ℃;
the method for calculating the allowable value of the pressure indication error introduced by the pressure gauge when the ambient temperature deviates from 20+/-5 ℃ comprises the following steps:
using the formula
V i temperature ＝ F i ×L i
Calculating the allowable value of pressure indication value error introduced by the pressure gauge when the ambient temperature deviates from 20+/-5 ℃, wherein V i temperature Is the allowable value of pressure indication error when the ambient temperature deviates from 20+/-5℃, F i Is deviated from the ambient temperature by 20+/-5 DEG CThe error allowance coefficient of the indicating value of the pressure gauge; l (L) i The measuring range of the pressure gauge;
the method for calculating the indication error allowance coefficient of the pressure gauge when the ambient temperature deviates from 20+/-5 ℃ comprises the following steps:
Using the formula
F ＝±K∆t
Calculating a pressure indication error allowance coefficient of the pressure gauge when the ambient temperature deviates from 20+/-5 ℃, wherein F is the pressure indication error allowance coefficient and K is the temperature influence coefficient; t= |t 2 －t 1 And, fatt is the degree deviating from 20+/-5 ℃; t is t 2 Is at ambient temperature, and when t 2 Above 25 ℃, t 1 25 ℃; when t 2 Below 15 ℃, t 1 15 ℃;
the method for calculating the basic allowable error value of the pressure gauge comprises the following steps:
using the formula
V i allow ＝v i allow ×L i
Calculating a pressure gauge base allowable error value, wherein V i allow To substantially allow error values, v i allow To be a basic allowable error coefficient, L i Is the measuring range of the pressure gauge;
the method for calculating the corrected measured value of the pressure gauge by using a formula comprises the following steps:
y i repair ＝y i shows ＋y i correction value
Calculating corrected measured values of the pressure gauge, wherein y i repair Corrected measured value for pressure gauge, y i shows For indicating the pressure of the pressure gauge, y i correction value And obtaining a correction value for the pressure gauge according to the corresponding traceability certificate, wherein the correction value is a negative indication error.
2. A method of detecting a pressure source using an on-line pressure gauge as claimed in claim 1, wherein:
if the pressure value of the pressure gauge under the pressure source is within the allowable range of the pressure source at the installation position of the pressure gauge, judging whether the pressure value of the pressure gauge is within the reliable fluctuation range; the upper limit of the reliable fluctuation range is the pressure of the pressure source when the pressure gauge is just installed plus the error allowable value of the pressure representation value, and the lower limit is the pressure source when the pressure gauge is just installed minus the error allowable value of the pressure representation value; the indication error allowable value is the superposition of the basic allowable error range of the pressure gauge and the pressure indication error range introduced when the ambient temperature deviates from 20+/-5 ℃;
If the judgment result is not in the reliable fluctuation range, verifying the judgment result, wherein the method for verifying the judgment result comprises the following steps:
replacing any pressure gauge in the pressure gauge group by using a qualified standby pressure gauge, wherein the qualified standby pressure gauge is consistent with the range, the precision grade and the graduation value of the replaced pressure gauge;
calculating a pressure value of a pressure source at the installation position of the pressure gauge by using the sum of the pressure indication value of the qualified standby pressure gauge and the correction value of the standby pressure gauge;
judging whether the difference between the pressure indication value of the replaced pressure gauge and the pressure value of the pressure source at the pressure gauge is within the allowable range of the indication value error;
if the pressure source pressure is within the range, calculating a pressure source pressure predicted value of each pressure gauge mounting position according to the pressure source pressure of the qualified standby pressure gauge and the pressure difference between the pressure source pressure and each pressure gauge;
comparing the pressure predicted value of the pressure source at the installation position of each pressure gauge with the pressure indication value of each pressure gauge, and if the difference between the pressure indication value and the pressure predicted value of the pressure source exceeds the allowable value range of the indication error, the pressure source does not meet the use requirement.
3. A method of detecting a pressure source using an on-line pressure gauge as claimed in claim 2, wherein:
the predicted value of the pressure source at the installation position of the pressure gauge is a corrected pressure indication value obtained when the pressure gauge is just installed, and the calculation method is the sum of the pressure indication value obtained when the pressure gauge is just installed and the correction value of the pressure gauge.
4. The method for detecting a pressure source by using an online pressure gauge according to claim 1, wherein the method for judging whether all pressure gauges in the pressure gauge group meet the use requirement by using the pressure indication value comprises the following steps:
each pressure gauge in the pressure gauge group is connected with other pressure gauges in the same pressure gauge group in pairs, and two pressure gauges which are connected are established as a pressure gauge group;
judging whether the difference between the pressure indicating value of the pressure gauge and the corrected measured value obtained when the pressure gauge is just installed is within the range of an indicating value error allowable value;
if yes, judging whether the difference between the pressure indication values of two pressure gauges in the pressure gauge group exceeds the allowable fluctuation range, and if yes, at least one pressure gauge in the pressure gauge group does not meet the use requirement; the pressure indication value difference of the pressure gauge group is the pressure indication value difference of two pressure gauges in the pressure gauge group at the same time.
5. The method for detecting a pressure source by using an online pressure gauge according to claim 4, wherein the calculation method for the allowable fluctuation range of the difference between the pressure indication values of the two pressure gauges in the pressure gauge group is as follows:
using the formula
∆ I =∆ i repair ±（V Allow and sum ＋V Mild ）
Calculating the upper limit and the lower limit of the fluctuation range allowed by the difference between the pressure indication values of two pressure gauges in the pressure gauge group, wherein father I Upper and lower limits of fluctuation allowed for pressure indication difference of pressure gauge set i repair For the difference between corrected measured values of two pressure gauges in a pressure gauge set, V Allow and sum V is the sum of absolute values of basic allowable errors of two pressure gauges in the pressure gauge group Mild The absolute value sum of pressure indication errors introduced when the ambient temperature deviates from 20+/-5 ℃ for two pressure gauges in the pressure gauge group;
using the formula
∆ i repair ＝y i repair －y i+n repair
Calculating the difference between the corrected measured values of the two pressure gauges, wherein father i repair Is of two pressuresThe difference between the corrected measured values of the table, y i repair For a corrected measured value, y, of one of the pressure gauges i+n repair For the other pressure gauge.
6. A method of detecting a pressure source using an on-line pressure gauge as defined in claim 4, wherein: when the difference between the pressure indication values of the pressure gauge groups exceeds the allowable fluctuation range, the repeated pressure gauges in the pressure gauge groups are the pressure gauges which are suspected to be out of compliance with the use requirement.
7. The method for detecting a pressure source by using an on-line pressure gauge according to claim 6, wherein the judgment result is verified after judging whether the difference between the pressure indication values of two pressure gauges in the pressure gauge group exceeds the allowable fluctuation range; the method for verifying the judgment result comprises the following steps:
Replacing the pressure gauge which is suspected to be out of compliance with the use requirement by using a qualified standby pressure gauge, wherein the qualified standby pressure gauge is consistent with the measuring range, the precision grade and the graduation value of the pressure gauge which is suspected to be out of compliance with the use requirement;
calculating a corrected measured value by using the sum of the pressure indication value of the qualified standby pressure gauge and the correction value obtained by the traceability certificate corresponding to the standby pressure gauge;
judging whether the difference between the qualified standby pressure gauge and the pressure indicating value of the pressure gauge connected with the standby pressure gauge exceeds the allowable fluctuation range, and if the difference does not exceed the allowable fluctuation range, indicating that the pressure gauge suspected of not meeting the use requirement cannot meet the use requirement.
8. A method of detecting a pressure source using an on-line pressure gauge as claimed in claim 7, wherein:
if the pressure gauge which is suspected to be not in accordance with the use requirement cannot meet the use requirement, calculating a predicted value at each pressure gauge according to the corrected measured value of the qualified standby pressure gauge and the pressure difference between each pressure gauge;
and comparing the predicted value of each pressure gauge with the pressure indication value of each pressure gauge, and if the difference between the pressure indication value and the predicted value exceeds the allowable range of the indication error, failing to meet the use requirement of the pressure gauge.
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