CN1470858A - Pipeline pressure meter - Google Patents
Pipeline pressure meter Download PDFInfo
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- CN1470858A CN1470858A CNA021270325A CN02127032A CN1470858A CN 1470858 A CN1470858 A CN 1470858A CN A021270325 A CNA021270325 A CN A021270325A CN 02127032 A CN02127032 A CN 02127032A CN 1470858 A CN1470858 A CN 1470858A
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Abstract
The pressure meter comprises a pressure detection part, a storage unit, a display unit, a printer, a keyboard and a control unit. The pressure detection part comprises cells for measuring high, medium and low pressures. The storage unit stores pressure value measured by the detection part. The display and the printer can show and print out the pressure value. Users can input commands by using the keyboard. According to the command input from the keyboard, the control unit controls the storage unit, the display and the printer. Data stored in the storage unit through a communication part can be transmitted to peripheral equipment. It is easy to carry out leakage test for pipeline by using the pressure meter. Moreover, the testing time is reduced. Users can obtain data from leakage tests so as to help to manage pipeline accurately.
Description
Technical field
The present invention relates to the instrument of gaging pressure, particularly, relate to the pressure gauge that detects all pipe leakages in the domestic gas piping system, wherein the gas pipeline system comprises pressure piping, middle pressure pipe road and low pressure pipeline.
Background technology
Rock gas does not produce the characteristic of polluter when having burning.Because the rock gas lta, so rock gas is easy to be diffused in the air.In addition, because be non-damp, rock gas is not dangerous.Because these rock gases will be by pipeline supply to the consumer dwelling, for example the conveying equipment in consumer dwelling just not only will be prepared natural gas transport is arrived in dwelling house, office building and apartment therefore, also needs the memory device of rock gas simultaneously.So rock gas b referred to as domestic gas.
Rock gas, promptly domestic gas arrives consumer dwelling, for example dwelling house, office building and apartment by pipeline supply.Pipeline is divided into three kinds, for example can bear every square centimeter ten kilogram (10kgf/cm
2) with the pressure piping of upward pressure, bear every square centimeter one kilogram to ten kilogram (10kgf/cm
2＞P 〉=1kgf/cm
2) between pressure middle pressure pipe road and can bear every square centimeter one kilogram (P＜1kgf/cm
2) following low pressure pipeline.
When pipeline be installed in underground after, will detect ducted gas and whether leak.This detection is called Leak Off Test (LOT).Leak Off Test (LOT) is in the ticket reserving time, with duct cap the closed at both ends of pipeline is lived, according to the volume of pipeline, by pressure-measuring instrument as mercury slug meter, water column meter or original pressure measured by the magnetic recording instrument and resulting pressure is finished.
Original pressure and resulting pressure are mainly measured by the magnetic recording instrument.Yet, because the pressure of magnetic recording apparatus measures can change with temperature, the therefore accurate interior pressure of measuring tube.
Also use the pressure-measuring instrument that has adopted pressure transducer to come the pressure of measuring tube.Because this instrument is divided into high-tension measuring instrument, middle pressure surveying instrument and low pressure measurement instrument, therefore need change surveying instrument according to the difference of institute's survey pipeline.
In addition, because above-mentioned traditional pressure-measuring instrument is exported institute's measuring pressure with graphics mode, the user can not accurately detect the variation of institute's measuring pressure.
Summary of the invention
Therefore, the present invention is with solving these shortcomings of technology formerly.A target of the present invention just provides a kind of pressure gauge, is used for detecting the pressure leakage of all pipelines in the piping system, and no matter the force value in the pipe is much.
Another target of the present invention provides a kind of pressure gauge, can by printable media for example paper print the force value of measurement.
The further target of the present invention provides a kind of pressure gauge, is used for detecting the leakage of pipeline in a short time.
Another target of the present invention provides a kind of pressure gauge, is used for storing the measured pressure value of pipeline, and the force value of storage is transferred on the peripherals.
In order to reach target of the present invention, the invention provides a kind of pressure gauge, comprise a pressure detecting part, produce pressure signal by measuring first pressure, second pressure and the 3rd pressure; A storer is used for storing the force value that pressure detecting part is measured; A display is used for showing the force value of mensuration; With a control assembly, be used for the processing pressure signal so that the force value of measuring is stored in the storer, and the control display is to show institute's measuring pressure value.
According to a kind of feature of the present invention, pressure detecting part has a first sensor that is used to detect first pressure; Second sensor that is used to detect second pressure, the 3rd sensor that is used to detect the 3rd pressure.
According to another kind of characteristic of the present invention, pressure gauge of the present invention further comprises a printer of printing institute's measuring pressure value.By printer institute's measuring pressure value is printed on the print media.
According to an aspect of the present invention, pressure gauge of the present invention further comprises a keyboard, and keyboard has the pressure options button, is used to select first pressure, second pressure and the 3rd pressure; Also have one measuring period key, be used to be provided with the measuring period of measuring first pressure, second pressure and the 3rd pressure.
Control assembly is handled institute's measuring pressure value in each of measuring period measured at interval, so that it is stored in the storer, controls the institute's measuring pressure value after the display display process, and force value is outputed to printer.Measuring is the portion of ten moieties measuring period at interval.
Keyboard further comprises adjusts key a zero point.When control assembly receives when adjusting signal that key sends zero point, the atmospheric pressure that control assembly is measured pressure detecting part is set at an atmospheric pressure, and institute's measuring pressure value is handled as the atmospheric relative pressure that sets.
Keyboard also comprises a current date/time key, is used for being provided with the current date and time when detecting first pressure, second pressure and the 3rd pressure; With a pressure unit key, be used for selecting the unit of institute's measuring pressure value.Control assembly is stored current date and time that is provided with by current date/time key and the pressure unit of being selected by the pressure unit key in storer, show and the current date and time and the selected pressure unit of print setting, and it is exported by display and printer.
Keyboard further comprises an original pressure-resulting pressure key, is used for exporting the original pressure value and the resulting pressure value of institute's measuring pressure in measuring period.When original pressure-when the resulting pressure key received signal, control assembly showed and print the original pressure value and the resulting pressure value of institute's measuring pressure by display and printer by pressing.
Keyboard further comprises an instantaneous pressure key.When pressing the instantaneous pressure key and receive signal, control assembly is by display and printer shows and output is measured instantaneous pressure value.
According to a further aspect in the invention, display comprises a LCD.
According to another kind of feature of the present invention, pressure gauge of the present invention further comprises a communication component, is used for communicating with external unit.The data that communication component will be stored in the storer send external unit to, and comprise a RS232C or USB (universal serial bus).
The accompanying drawing summary
Fig. 1 is a schematic block diagram, and the pressure gauge of a preferred embodiment of the invention is shown;
Fig. 2 is the view of a manometric example of the preferred embodiment of the present invention;
Fig. 3 A is the view that date and time is set in the pressure gauge of the preferred embodiment of the present invention;
Fig. 3 B is a view of selection pressure unit in the pressure gauge of the preferred embodiment of the present invention;
Fig. 3 C is the view that data capacity is set in the pressure gauge of the preferred embodiment of the present invention; And
Fig. 3 D measures the view that is presented at the data on the display in the press process at the pressure gauge that uses the preferred embodiment of the present invention.
Embodiment
Fig. 1 is a schematic block diagram, and the pressure gauge of a kind of preferred embodiment of the present invention is shown; Fig. 2 is the view of a manometric example of the preferred embodiment of the present invention.
As shown in the figure, the pressure gauge of a kind of preferred embodiment of the present invention comprises a pressure detecting part 10, produces a pressure signal by measuring first pressure, second pressure and the 3rd pressure; A storer 50 is used for storing the force value that pressure detecting part 10 is measured; A display 80 is used for showing the force value of mensuration; With a control assembly 40, be used for the processing pressure signal so that the force value of measuring is stored in the storer 50, and control display 80 is measured force value to show.
In this embodiment, first pressure is identical with lower pressure in the aforementioned technology formerly, and second pressure is identical with intermediate pressure in the technology formerly, and the 3rd pressure is identical with elevated pressures in the technology formerly.Yet according to the difference in deviser and the manometric province of use the present invention, the scope of from first to the 3rd pressure can change.In the present embodiment, only use with the scope that formerly technical scope is identical as an example.
When pipeline is connected some go up in first to the 3rd sensor 11,13 and 15, ducted fluid, promptly ducted combustion gas is by among one in the flow sensor 11,13 and 15 in pipeline and breakout box 12,14 and 16.Like this, in the sensor 11,13 and 15 has just measured ducted pressure.
By the pressure of measuring channel, sensor 11,13 and 15 produces a pressure signal.This pressure signal is exaggerated device 20 and amplifies.The pressure signal that has amplified converts digital signal to by analog/digital converter 30.Digital pressure signal after the conversion is stored in the storer 50, and is presented on the display 80 through the processing of control assembly 40.Display comprises LCD (LCD).
The pressure gauge of the preferred embodiment of the present invention comprises a printer 60, is used for the force value that the force of impression detection part is measured; With a keyboard 90, be used for to the specific order of control assembly 40 inputs.
If pressure options button 92 is pressed, will detect a force value, that is, a force value in first pressure, second pressure and the 3rd pressure will be presented on the display 80 subsequently.At this moment, press carriage return (ENTER) key 93, a force value that is presented on the display 80 just is stored in the storer 50.
Measuring period, key 94 was keys that are used for the cycle that is provided with when measuring pressure, was divided into one minute, two minutes, five minutes, ten minutes, 30 minutes and one hour (60 minutes).Press key 94 measuring period, just on display 80, show measuring period subsequently, and after pressing enter key 93, be stored in the storer 50 the selected measuring period of demonstration with regard to Be Controlled parts 40.
In each measurement at interval of measuring period, first, second and the 3rd pressure all Be Controlled parts 40 are handled and are stored in the storer 50, and are presented on the display 80.Be divided into ten parts time measuring period when measuring at interval.For example, if be one minute measuring period, measure be exactly at interval 1 minute by 10 times of removing, promptly 6 seconds.If be 5 minutes (300 seconds) measuring period, measure be exactly at interval 300 seconds by 10 times of removing, promptly 30 seconds.Therefore, 40 pairs of per 6 seconds (or per 30 seconds) control assemblies are measured force value and are handled once, are stored in the storer 50 and are presented on the display 80, and be printed on printable measurement such as the paper by printer 60.
Current date/time key is a key that is used for being provided with the current date and time when detecting first pressure, second pressure and the 3rd pressure.By pressing the pressure unit key, can input pressure unit, for example, be one of following unit in the present embodiment: kPa (Kpa), the millimeter of water (mmH
2O), kilogram/square centimeter (kgf/cm
2), pounds per square foot (PSI), the millibar (mbar) and mm Hg (mmHg).The data storage capacity key is the key that is used for selecting to be stored in the data capacity in the storer 50.To be stored in the pressure type that force value, current date, current unit, pressure detecting part 10 that one group of data in the storer 50 comprise that pressure detecting part 10 is measured measure (in first pressure, second pressure and the 3rd pressure a kind of) and be defined as the data capacity of data number.
In a preferred embodiment of the invention, current date/time key, pressure unit key and data storage capacity key are made of a mode key 98 and many arrow key 98A, 98B, 98C and 98D.When mode key 98 is pressed once, mode key 98 is carried out current date/time key functions.At this moment, as shown in Figure 3A, control assembly 40 is presented at " change date " information on the display 80, and current date and time is shown as the form of " YYYY/MM/DD HH:MM ", and cursor is positioned under first " Y ".In order to change the current date and time on the display 80, can press upwards (UP) arrow key 98A, first " Y " just increases by 1 then.On the contrary, press (DOWN) arrow key 98B downwards, first " Y " just reduces 1.Press (LEFT) arrow key 98C left, cursor is moved to the left, and presses to the right (RIGHT) arrow key 98D, and cursor moves on to the right.
When changed year, month, day, the time and branch after, press enter key 93, control assembly 40 just will be arranged to current date and time with the date and time of mode key 98 and arrow key 98A, 98B, 98C and 98D change.
When mode key 98 is pressed twice, mode key 98 is just as the pressure unit key.In other words, if mode key 98 is pressed twice, shown in Fig. 3 B, control assembly 40 control display 80 display message " change pressure unit ", and under information, show pressure unit.First unit that shows on display 80 is kPa.If press to Right Arrow 98D, the millimeter of water, kilogram/square centimeter, pounds per square foot, millibar and mm Hg are presented on the display 80 in order.When pressing to left arrow 98C, the pressure unit that is presented on the display 80 shows by opposite order.If supress enter key 93 when the pressure unit that explicit user is wished, control assembly 40 just is stored in selected pressure unit in the storer 50, and control display 80 shows selected pressure unit.Shown in Fig. 3 D, selected pressure unit is displayed on the display 80, and and the pressure measured and current date and time together, the machine of being printed is printed on the printable material.
If mode key 98 is pressed three times, shown in Fig. 3 C, under the control of control assembly 40, on display 80, show the information of " data storage capacity is set ", and below the information that shows on the display 80, demonstrate the number of the data of storage in storer 50.In order to change the number of data, need to use arrow key 98A, 98B, 98C and 98D.
In this embodiment of the present invention, 200 data are stored in the storer 50.The capacity of data can change according to the capacity of storer 50, and the capacity of storer can be revised by the deviser.
When the user presses original pressure-resulting pressure key 95, control assembly 40 control displays are presented at the original pressure value and the resulting pressure value of the pressure of internal pressure detection part 10 mensuration measuring period, and control printer 60 is printed original pressure value and resulting pressure values.
In addition, when the user pressed instantaneous pressure key 93, control assembly 40 control displays 80 showed an instantaneous pressure value of being measured by pressure detecting part 10 when the moment that instantaneous pressure key 93 is pressed, and control printer 60 is printed the instantaneous pressure value.
The data that are stored in the storer 50 comprise the mensuration pressure that is transmitted to the peripherals (not shown) by communication component 70, are used for communicating by letter with peripherals.Communication component 70 comprises a RS232C or USB (universal serial bus) (USB), and some equipment of communicating by letter with peripherals, for example is used as the computing machine of communication component 70.
The user can be sent to the storage data in the storer 50 in the peripherals by communication component 70, can be installed in the details of the data of the parser analysis storage in the peripherals by utilization with the form output channel of chart, in addition, can also accurately detect and manage pipeline.
To the manometric operation of the preferred embodiment of the present invention be described in detail below.
At first, if the power key 91 on the ammonium lower keyboard 90, the pressure gauge energising of the preferred embodiment of the present invention, pressure gauge can detect pipeline.Adjust key zero point and adjust 96 pairs of manometric zero points by pressing, pipeline is connected on first, second and one of the 3rd breakout box 12,14 and 16 then.
By working pressure options button 92 and measuring period key 94, select one and measuring period in first, second and the 3rd pressure.Operator scheme key 98, a plurality of arrow key 98A, 98B, 98C and 98D, and enter key 93, thus set current date and time, pressure unit and the data capacity that is stored in the storer 50.If original pressure-resulting pressure key 95 is pressed, in each all period interval of measuring period, the pressure that control assembly 40 is measured pressure detecting part 10 is stored in the storer 50, and the force value of control display 80 demonstration mensuration, control printer 60 is printed and is comprised the data of measuring pressure.At this moment, print data comprises kind, mensuration force value and the pressure unit of current date, current time, mensuration pressure.Along with the end of measuring period, measuring period, the original pressure and the resulting pressure of interior conduit were displayed on the display 80, and data were exported with printer 60 by the control of control assembly 40.
As mentioned above, manometric according to the preferred embodiment of the invention feature, all pipeline pressures of pressure piping, middle pressure pipe road and low pressure pipeline can use single pressure gauge to measure, and need not change.
Pipeline pressure is printed on the printable material with digital form, can shorten the measuring period of pipeline like this.
Because the unit of time during measuring channel pressure and mensuration pressure is printed together, can guarantee the reliability of pipe leakage test.
In addition, because testing result and the Accurate Analysis testing result that may store the pipeline with change pressure make it possible to pipeline is managed fully.
More than the present invention is described in detail, yet be to be understood that, more than describe in detail and concrete example, although preferred embodiments of the present invention have been disclosed for illustrative, it also is the mode of signal, those skilled in the art can find out from describe in detail, within the spirit and scope of the invention, can carry out various changes and correction to it.
Claims (29)
1. pressure gauge comprises:
A pressure detecting part produces pressure signal by measuring first pressure, second pressure and the 3rd pressure;
A storer is used for storing the force value that pressure detecting part is measured;
A display is used for showing the force value of mensuration;
A control assembly is used for the processing pressure signal so that the force value of measuring is stored in the storer, and the control display is measured force value to show.
2. the pressure gauge described in the claim 1 is characterized in that, pressure detecting part comprises:
A first sensor that is used to detect first pressure;
Second sensor that is used to detect second pressure; With
The 3rd sensor that is used to detect the 3rd pressure.
3. the pressure gauge described in the claim 2 is characterized in that, pressure detecting part further comprises:
One first breakout box is used for first sensor is connected first pipeline with first pressure;
One second breakout box is used for second sensor is connected second pipeline with second pressure; With
One the 3rd breakout box is used for the 3rd sensor is connected the 3rd pipeline with the 3rd pressure.
4. the pressure gauge described in the claim 1 comprises that further is used for printing a printer of measuring pressure.
5. the pressure gauge described in the claim 4 further comprises:
A keyboard comprises a pressure options button, is used to select first pressure, second pressure and the 3rd pressure; With one measuring period key, be used to be provided with the measuring period when measuring first pressure, second pressure and the 3rd pressure.
6. the pressure gauge described in the claim 5 is characterized in that, control assembly is handled the mensuration force value that is stored in the storer in each measurement at interval of measuring period, and the control display shows the mensuration force value, and the control printer prints is measured force value.
7. the pressure gauge described in the claim 6 is characterized in that, measuring is 1/10th of measuring period at interval.
8. the pressure gauge described in the claim 5, it is characterized in that keyboard further comprises adjusts key a zero point, is used to adjust manometric zero point, when receiving when adjusting the signal of key zero point, the atmospheric pressure that control assembly is measured pressure detecting part is set at an atmospheric pressure.
9. the pressure gauge described in the claim 8 is characterized in that, when receiving when adjusting the signal that key sends zero point, control assembly is handled the pressure of being surveyed as the atmospheric relative pressure of adjusting zero point.
10. the pressure gauge described in the claim 9 is characterized in that, keyboard further comprises:
A current date/time key, the current date and time when being used for that pressure detecting part is set and detecting first pressure, second pressure and the 3rd pressure.
11. the pressure gauge described in the claim 10, it is characterized in that, the current time that current date, measurement are increased at interval, mensuration force value, and in selected first pressure, second pressure and the 3rd pressure of pressure options button one, all be stored in the storer, be presented on the display, and come out by printer prints.
12. the pressure gauge described in the claim 10 is characterized in that, keyboard further comprises a pressure unit key, is used for selecting the unit of tested force value, and selected pressure unit is stored in the storer, is presented on the display, and comes out by printer prints.
13. the pressure gauge described in the claim 5, it is characterized in that, keyboard further comprises an original pressure-resulting pressure key, be used for exporting original pressure value and the resulting pressure value of measuring pressure in measuring period, when from signal of original pressure-resulting pressure key input, measure the original pressure value of pressure and the resulting pressure value shows and the machine that is printed prints on display.
14. the pressure gauge described in the claim 5, it is characterized in that keyboard further comprises an instantaneous pressure key, when the time from signal of instantaneous pressure key input, the instantaneous pressure that pressure detecting part is measured is presented on the display, and the machine that is printed prints.
15. the pressure gauge described in the claim 1 is characterized in that, display comprises a LCD.
16. the pressure gauge described in the claim 1 comprises that further is used for a communication component of communicating by letter with peripherals.
17. the pressure gauge described in the claim 16 is characterized in that, control assembly will be measured pressure by communication component and send peripherals to.
18. the pressure gauge described in the claim 16 is characterized in that, communication facilities comprises a RS232C.
19. the pressure gauge described in the claim 16 is characterized in that, communication component comprises a USB (universal serial bus).
20. a pressure gauge comprises:
A pressure detecting part comprises a first sensor that is used to detect first pressure, second sensor that is used to detect second force value, and the 3rd sensor that is used to detect the 3rd force value, and produce pressure signal;
A storer is used to store the force value that pressure detecting part is measured;
One is used to show the display of measuring force value;
One is used to print the printer of measuring force value; And
A control assembly will be measured force value by the processing pressure signal and deposit in the storer, and the control display shows measures pressure, and the control printer.
21. the pressure gauge described in the claim 20 is characterized in that, pressure detecting part comprises:
One first breakout box is used for first sensor is connected first pipeline with first pressure;
One second breakout box is used for second sensor is connected second pipeline with second pressure; And
One the 3rd breakout box is used for the 3rd sensor is connected the 3rd pipeline with the 3rd pressure.
22. the pressure gauge described in the claim 20 further comprises a keyboard, keyboard comprises a pressure options button, is used to select first pressure, second pressure and the 3rd pressure; Also have one measuring period key, be used to select to measure the measuring period of first pressure, second pressure and the 3rd pressure, it is characterized in that, control assembly is handled measuring force value in each measurement at interval of measuring period, mensuration force value after the processing shows on display, and is come out by printer prints.
23. the pressure gauge described in the claim 22 is characterized in that, measuring is 1/10th of measuring period at interval.
24. the pressure gauge described in the claim 22, it is characterized in that keyboard further comprises adjusts key a zero point, is used to adjust the zero point of pressure detecting part, when adjusting signal of key input zero point, the atmospheric pressure that control assembly is measured pressure detecting part is set at an atmospheric pressure.
25. the pressure gauge described in the claim 22 is characterized in that, keyboard further comprises a current date/time key, the current date and time when being used for that pressure detecting part is set and detecting first pressure, second pressure and the 3rd pressure; And current time that current date, measurement are increased at interval and mensuration force value all are stored in the storer, are presented on the display, and come out by printer prints.
26. the pressure gauge described in the claim 22, it is characterized in that, keyboard further comprises an original pressure-resulting pressure key, be used for exporting original pressure value and the resulting pressure value of measuring pressure in measuring period, when from signal of original pressure-resulting pressure key input, measure the original pressure value of pressure and the resulting pressure value shows and the machine that is printed prints on display.
27. the pressure gauge described in the claim 20 further comprises a communication component, is used for communicating with peripherals.
28. the pressure gauge described in the claim 27 is characterized in that, communication component comprises a RS232C.
29. the pressure gauge described in the claim 27 is characterized in that, communication component comprises a USB (universal serial bus).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021270325A CN1470858A (en) | 2002-07-26 | 2002-07-26 | Pipeline pressure meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021270325A CN1470858A (en) | 2002-07-26 | 2002-07-26 | Pipeline pressure meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1470858A true CN1470858A (en) | 2004-01-28 |
Family
ID=34143452
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA021270325A Pending CN1470858A (en) | 2002-07-26 | 2002-07-26 | Pipeline pressure meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1470858A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101832787A (en) * | 2010-04-19 | 2010-09-15 | 哈尔滨工程大学 | Pipeline pressure real-time monitoring device |
| CN102410911A (en) * | 2011-07-29 | 2012-04-11 | 四川省特种设备检验研究院 | Detection method of gas tightness of CNG fuel system and detection apparatus thereof |
| CN102650374A (en) * | 2012-05-10 | 2012-08-29 | 昆山市恒安工业气体有限公司 | Gas transmission pipeline capable of being remotely controlled |
| CN105486447A (en) * | 2015-12-29 | 2016-04-13 | 常熟市上海飞奥压力容器制造有限公司 | Pipeline pressure detection device |
-
2002
- 2002-07-26 CN CNA021270325A patent/CN1470858A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101832787A (en) * | 2010-04-19 | 2010-09-15 | 哈尔滨工程大学 | Pipeline pressure real-time monitoring device |
| CN101832787B (en) * | 2010-04-19 | 2012-05-23 | 哈尔滨工程大学 | Pipeline pressure real-time monitoring device |
| CN102410911A (en) * | 2011-07-29 | 2012-04-11 | 四川省特种设备检验研究院 | Detection method of gas tightness of CNG fuel system and detection apparatus thereof |
| CN102410911B (en) * | 2011-07-29 | 2014-04-09 | 四川省特种设备检验研究院 | Detection method of gas tightness of CNG fuel system and detection apparatus thereof |
| CN102650374A (en) * | 2012-05-10 | 2012-08-29 | 昆山市恒安工业气体有限公司 | Gas transmission pipeline capable of being remotely controlled |
| CN105486447A (en) * | 2015-12-29 | 2016-04-13 | 常熟市上海飞奥压力容器制造有限公司 | Pipeline pressure detection device |
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