CN108195445B - Natural gas high-flow real-flow verification secondary standard device and method - Google Patents
Natural gas high-flow real-flow verification secondary standard device and method Download PDFInfo
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- CN108195445B CN108195445B CN201711491270.7A CN201711491270A CN108195445B CN 108195445 B CN108195445 B CN 108195445B CN 201711491270 A CN201711491270 A CN 201711491270A CN 108195445 B CN108195445 B CN 108195445B
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 72
- 238000012795 verification Methods 0.000 title claims abstract description 64
- 239000003345 natural gas Substances 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims description 15
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 100
- 238000007789 sealing Methods 0.000 claims abstract description 43
- 239000007789 gas Substances 0.000 claims description 16
- 238000010561 standard procedure Methods 0.000 claims description 8
- 238000012360 testing method Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 abstract description 20
- 238000005259 measurement Methods 0.000 abstract description 8
- 238000012423 maintenance Methods 0.000 abstract description 7
- 239000003209 petroleum derivative Substances 0.000 abstract description 4
- 238000012938 design process Methods 0.000 abstract description 3
- 238000005457 optimization Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
- 102220068554 rs201088893 Human genes 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
- G01F25/15—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters specially adapted for gas meters
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Abstract
The invention provides a natural gas high-flow real-flow verification secondary standard device, which comprises an upstream manifold, a downstream manifold and fifteen paths of critical flow nozzles which are arranged in parallel; the lower end of each critical flow nozzle is communicated with a downstream collecting pipe, and the upper end of each critical flow nozzle is communicated with an upstream collecting pipe; and a rectifier is arranged at the upstream of each critical flow nozzle, and a telescopic device is arranged at the downstream of each critical flow nozzle. In the design process of the elm checking point of the national petroleum and natural gas large-flow metering station, the device is adopted to realize the verification of the working level standard flowmeter and other high-precision flowmeters. The tube capacity of the small flow detection is reduced by 1.3m 3, and the uncertainty of system measurement in the detection is improved. The number of the zero-leakage forced sealing ball valves is reduced, and the investment cost of the device is reduced by about 50 ten thousand dollars and the maintenance cost of the valve is reduced by 20 ten thousand/year.
Description
Technical Field
The invention belongs to the field of natural gas metering, and particularly relates to a secondary standard device and method for natural gas high-flow real-flow verification.
Background
1. Domestic real flow verification value transmission system condition
At present, large and medium caliber (DN 200 and above) natural gas metering flowmeters for domestic trade handover, such as ultrasonic flowmeters, turbine flowmeters and the like (detected flowmeters) are subjected to actual flow forced verification and calibration by adopting a standard meter method (working standard), the uncertainty of a system of the working standard can reach 0.33%, and a standard meter generally adopts a 0.25-level high-precision gas turbine flowmeter. The real-flow forced verification and calibration of the standard table are carried out, and the natural gas metering verification site in China mainly adopts a secondary device consisting of parallel critical flow nozzles for real-flow verification because the critical flow nozzles have stable critical flow characteristics and very high uncertainty of outflow coefficients, and the uncertainty of the system of the secondary device can reach 0.25%. The critical flow nozzle of the secondary device performs real-flow forced verification by an mt method primary standard (the uncertainty of the system can reach 0.1% -0.05%), so that a perfect magnitude transmission system is formed:
2. Domestic secondary verification device condition
The secondary standard of the domestic natural gas metering verification station consists of a group of parallel critical flow nozzles, wherein the upper and lower streams of the nozzles are respectively provided with 1 air inlet manifold and air outlet manifold with DN350, and the upper and lower streams of each nozzle are provided with a cut-off valve for realizing the combination selection of different flow rates.
According to the measuring range of the standard flow meter to be tested and the maximum testing capability of the primary standard (domestic maximum 400m 3/h), the secondary device needs to select the measuring range of a single nozzle and determine the number of nozzles in each measuring range. At present, the working condition flow of the largest single secondary device in China is 3100m 3/h, the uncertainty of the system is 0.25%, the number of the nozzles is 12 at most, the typical range of the nozzles is 10m3/h、20m3/h、40m3/h、80m3/h、160m3/h、320m3/h、400m3/h, full range, DN 50-DN 250 (10-2500 m 3/h) can be verified, and the high-precision turbine works as a standard flowmeter.
3. Flow of domestic secondary standard verification work standard flowmeter
When the secondary standard is used for verifying the working level standard, the verification gas flow is as follows: verification of incoming gas, working level standard upstream manifold, tested working level standard flowmeter pipeline, working level standard downstream manifold, bypass over verification station pipeline, secondary standard upstream manifold, required nozzle combination pipeline, secondary standard upstream manifold and exhaust; and selecting a plurality of flow points to be verified according to the flow range of the detected working level flowmeter and the requirements of verification rules, and correspondingly opening a secondary standard nozzle combination pipeline.
The process has the following problems:
1) The pipe capacity (pipeline volume) between the upstream of the nozzle and the calibrated working standard flowmeter of the calibrating process system is large, so that when the calibrating process system is used for calibrating, natural gas flowing through the calibrated flowmeter and the nozzle is easy to change in volume due to the fact that the pipe capacity is too large and is influenced by system pressure and ambient temperature, the natural gas flow flowing through the calibrated working standard flowmeter and the nozzle at the same time scale is changed, and the uncertainty of the calibrating system is increased.
2) Particularly, when a small flow section (< 150m 3/h) is detected, the mode of arranging a large-caliber collecting pipe at the upstream of the secondary device inevitably leads to the operation of a small flow nozzle, the influence of the pipe capacity is increased, and the uncertainty of the system is increased;
3) For the check of large flow section (> 1000m 3/h), the upstream and downstream of each nozzle are provided with cut-off valves, for the nozzle combination which is selected to be opened and closed simultaneously, a large number of cut-off valves do not realize the function of the nozzle flow combination, but rather increase investment and maintenance.
Disclosure of Invention
In order to solve the problems of low accuracy and high cost investment in the existing verification, the invention provides a secondary standard device and a method for natural gas high-flow real-flow verification, and the invention optimizes the group sledge form of the secondary standard device, reduces the pipe capacity of an upstream pipe header during low-flow detection, and improves the verification accuracy; the number of the shut-off valves is reduced, and investment and maintenance are reduced to a certain extent. The invention is applied to the elm forest detection point of a national petroleum and natural gas high-flow metering station, the device detection range (10 m 3/h~4230m3/h), the uncertainty of the system is 0.22%, and the high-precision working standard flowmeter of DN 50-DN 300 (10-4000 m 3/h) can be detected in a full-range.
A natural gas high-flow real-flow verification secondary standard device comprises an upstream collecting pipe, a downstream collecting pipe and fifteen paths of critical flow nozzles which are arranged in parallel; the lower end of each critical flow nozzle is communicated with a downstream collecting pipe, and the upper end of each critical flow nozzle is communicated with an upstream collecting pipe; and a rectifier is arranged at the upstream of each critical flow nozzle, and a telescopic device is arranged at the downstream of each critical flow nozzle.
The upstream collecting pipe comprises a first upstream collecting pipe, a second upstream collecting pipe and a third upstream collecting pipe, wherein the first upstream collecting pipe is connected with the second upstream collecting pipe through a first collecting pipe forced sealing ball valve, and the second upstream collecting pipe is connected with the third upstream collecting pipe through a second collecting pipe forced sealing ball valve; the first upstream manifold is provided with two inlets, a first inlet and a second inlet, wherein the first inlet pipeline is DN250, and the second inlet pipeline is DN100; a third inlet is provided in the second upstream manifold, and the third inlet line is DN150.
The first upstream manifold is connected with four critical flow nozzles, the four critical flow nozzles are DN50 nozzles, and the flow rates are 10m 3/h、20 m3/h、40 m3/h and 80m 3/h respectively; the first upstream manifold is DN250.
The second upstream manifold is connected with six paths of critical flow nozzles, the six paths of critical flow nozzles are DN100 nozzles, the flow rates of two critical flow nozzles are 160 m 3/h and 320 m 3/h respectively, the flow rates of the other four critical flow nozzles are 400 m 3/h, and the second upstream manifold is DN300.
The third upstream manifold is connected with five paths of critical flow nozzles, the five paths of critical flow nozzles are DN100 nozzles, and the flow rates are 400m 3/h; the third upstream manifold is DN300.
The lower forced sealing ball valve is arranged at the downstream of the telescopic device.
The upper end of the rectifier is provided with an upper forced sealing ball valve.
A natural gas high-flow real-flow verification secondary standard method comprises the following specific steps:
When the standard flow meter group is tested or DN250-DN300 high-precision flow meters are tested, test gas enters the first upstream collecting pipe through the first inlet, and is discharged to the downstream from the outlet through the opened critical flow nozzles with different paths;
A. when the verification flow point is less than or equal to 150 m 3/h, closing the first manifold forced sealing ball valve, and simultaneously opening four paths of critical flow nozzles arranged at the lower end of the first upstream manifold;
B. when the flow point is detected to be 150 m 3/h—2000 m3/h, opening the first manifold forced sealing ball valve, closing the second manifold forced sealing ball valve, and simultaneously;
C. when the verification flow point is more than 2000 m 3/h, opening the second manifold forced sealing ball valve;
When the DN50-DN100 high-precision flowmeter is detected, the first inlet is closed, the detected gas enters the first upstream collecting pipe through the second inlet, and is discharged to the downstream from the outlet through the opened critical flow nozzles 3 with different paths;
A. When the verification flow point is less than or equal to 150 m 3/h, closing the first manifold forced sealing ball valve;
B. when the verification flow point is greater than 150 m 3/h, opening the first manifold forced sealing ball valve, and closing the second manifold forced sealing ball valve;
When the DN150 high-precision flowmeter is detected, the first inlet, the second inlet and the second manifold forced sealing ball valve are closed, the detected gas enters the third upstream manifold through the third inlet, and is discharged from the outlet to the downstream through the opened critical flow nozzles with different paths.
The beneficial effects of the invention are as follows:
In the design process of the elm checking point of the national petroleum and natural gas large-flow metering station, the device is adopted to realize the verification of the working level standard flowmeter and other high-precision flowmeters.
1. The tube capacity of the small flow detection is reduced by 1.3m 3, and the uncertainty of system measurement in the detection is improved. According to the verification specification, the pressure fluctuation is ensured not to exceed 0.5%, and under the condition that the temperature is kept unchanged, the volume change quantity DeltaV= (V1-V2) ×0.5% = 0.28m 3 of the standard working condition of the pipe capacity natural gas storage quantity influences the maximum uncertainty of the flow measurement value to be uq= (DeltaV/V2) 1/2 =0.2. ' s of
2. The number of the zero-leakage forced sealing ball valves is reduced, and the investment cost of the device is reduced by about 50 ten thousand dollars and the maintenance cost of the valve is reduced by 20 ten thousand/year.
Further description will be made below with reference to the accompanying drawings.
Drawing and description
Fig. 1 is a schematic diagram of a secondary standard apparatus for natural gas mass flow real-flow verification.
In the drawings, reference numerals are: 1. an upstream manifold; 101. a first upstream manifold; 102. a second upstream manifold; 103. a third upstream manifold; 104. a first inlet; 105. a second inlet; 106. a third inlet; 107. the first manifold force seals the ball valve; 108. the second manifold forcibly seals the ball valve; 2. a downstream header; 3. a critical flow nozzle; 4. a rectifier; 5. a telescopic device; 6. the ball valve is forcedly sealed; 7. and a lower forced sealing ball valve.
Detailed Description
Example 1:
In order to solve the problems of low accuracy and high cost investment in the existing verification, the invention provides a secondary standard device and a method for natural gas high-flow real-flow verification, as shown in figure 1, and the invention optimizes the group sledge form of the secondary standard device, reduces the pipe capacity of an upstream pipe header during low-flow detection, and improves the verification accuracy; the number of the shut-off valves is reduced, and investment and maintenance are reduced to a certain extent.
A natural gas high-flow real-flow verification secondary standard device comprises an upstream collecting pipe 1, a downstream collecting pipe 2 and fifteen paths of critical flow nozzles 3 which are arranged in parallel; the lower end of each critical flow nozzle 3 is communicated with the downstream collecting pipe 2, and the upper end of each critical flow nozzle 3 is communicated with the upstream collecting pipe 1; a rectifier 4 is arranged at the upstream of each critical flow nozzle 3, and a telescopic device 5 is arranged at the downstream of each critical flow nozzle 3.
The verification gas to be detected in the invention enters the device through the upstream collecting pipe 1, and is discharged from the outlet to the downstream through the opened critical flow nozzles 3 with different paths.
The invention reduces the pipe capacity by 1.3m 3 in small flow detection and improves the uncertainty of system measurement in detection. The calculation process comprises the following steps:
Calculation Guan Rong v1=1.457 m 3 of device non-optimization, and natural gas stock standard working condition volume v10=43×v1= 62.65m 3 when detected at 4.2 MPa;
and calculating Guan Rong V2=0.162 m 3 after device optimization, and carrying out natural gas storage standard working condition volume V20=43×V2=6.97 m 3 in the process of 4.2MPa detection.
According to the verification specification, the pressure fluctuation is ensured not to exceed 0.5%, and under the condition that the temperature is kept unchanged, the volume change quantity DeltaV= (V1-V2) ×0.5% = 0.28m 3 of the standard working condition of the pipe capacity natural gas storage quantity influences the maximum uncertainty of the flow measurement value to be uq= (DeltaV/V2) 1/2 =0.2.
Example 2:
Based on the above embodiment, in this embodiment, the upstream manifold 1 includes a first upstream manifold 101, a second upstream manifold 102, and a third upstream manifold 103, where the first upstream manifold 1 is connected to the second upstream manifold 2 through a first manifold forced seal ball valve 107, and the second upstream manifold 2 is connected to the third upstream manifold 3 through a second manifold forced seal ball valve 108; the first upstream manifold 101 is provided with two inlets, a first inlet 104 and a second inlet 105, the pipeline of the first inlet 104 is DN250, and the pipeline of the second inlet 105 is DN100; a third inlet 106 is provided in the second upstream manifold 102, and the third inlet 106 is connected to DN150.
The first upstream manifold 101 is connected with four critical flow nozzles 3, the four critical flow nozzles 3 are DN50 nozzles, and the flow rates are 10m 3/h、20 m3/h、40 m3/h and 80m 3/h respectively; the first upstream manifold 101 is DN250.
The second upstream manifold 102 is connected with six paths of critical flow nozzles 3, the six paths of critical flow nozzles 3 are DN100 nozzles, wherein the flow rates of two critical flow nozzles 3 are 160 m 3/h and 320 m 3/h respectively, the flow rates of the other four critical flow nozzles 3 are 400m 3/h respectively, and the second upstream manifold 102 is DN300.
The third upstream manifold 103 is connected with five paths of critical flow nozzles 3, the five paths of critical flow nozzles 3 are DN100 nozzles, and the flow rates are 400 m 3/h; the third upstream manifold 103 is DN300.
The lower forced sealing ball valve 7 is arranged at the downstream of the telescopic device 5.
The upper end of the rectifier 4 is provided with an upper forced sealing ball valve 6.
The invention simplifies the number of zero-leakage forced sealing ball valves, reduces the investment cost of the device by about 50 ten thousand dollars and the maintenance cost of the valve by 20 ten thousand/year. The invention reduces the pipe capacity by 1.3m 3 in small flow detection and improves the uncertainty of system measurement in detection.
A natural gas high-flow real-flow verification secondary standard method comprises the following specific steps:
When the standard flow meter group is tested or DN250-DN300 high-precision flow meters are tested, test gas enters the first upstream collecting pipe 101 through the first inlet 104, and is discharged to the downstream from the outlet through the opened critical flow nozzles 3 with different paths;
A. When the verification flow point is less than or equal to 150m 3/h, closing the first manifold forced sealing ball valve 107, and simultaneously opening a four-way critical flow nozzle 3 arranged at the lower end of the first upstream manifold 101;
B. When the flow point is detected to be 150m 3/h—2000 m3/h, opening the first manifold forced sealing ball valve 107, closing the second manifold forced sealing ball valve 108, and simultaneously;
C. when the verification flow point is more than 2000 m 3/h, opening the second manifold forced seal ball valve 108;
When the high-precision flow meter of DN50-DN100 is detected, the first inlet 104 is closed, the detected gas enters the first upstream collecting pipe 101 through the second inlet 105, and is discharged from the outlet to the downstream through the opened critical flow nozzles 3 with different paths.
A. when the verification flow point is less than or equal to 150 m 3/h, closing the first manifold forced seal ball valve 107;
B. when the verification flow point is greater than 150m 3/h, opening the first manifold forced sealing ball valve 107, and closing the second manifold forced sealing ball valve 108;
when the DN150 high-precision flowmeter is detected, the first inlet 104, the second inlet 105 and the second manifold forced sealing ball valve 108 are closed, the detected gas enters the third upstream manifold 103 through the third inlet 107, and is discharged to the downstream from the outlet through the opened critical flow nozzles 3 with different paths;
When calibrating a working standard flowmeter set or a high-precision flowmeter of DN250-DN300, calibration gas enters the device through the first inlet 104, and is discharged downstream from the outlet through the opened nozzles with different paths. When the verification flow point is less than or equal to 150 m 3/h, the first upstream manifold forced sealing ball valve 107 is closed, and the verification can be realized by only using four paths of nozzles connected with the lower end of the first upstream manifold 101, so that the pipe capacity is reduced, and the verification accuracy is improved; when the verification flow point is less than or equal to 2000 m 3/h, the second upstream manifold forced sealing ball valve 108 is not opened, and the influence of the pipe capacity in the five-way nozzle connected with the lower end of the third upstream manifold 103 during detection is reduced; when the detected flow rate point is more than 2000 m 3/h, the second upstream manifold forced sealing ball valve 108 is opened, and meanwhile, five paths of nozzles connected with the lower end of the third upstream manifold 103 are opened, so that the flow rate range of the device meets the detected flow rate point.
When the high-precision flow meter of DN50-DN100 is detected, the first inlet 104 is closed, the detection gas enters the device through the second inlet 105, and is discharged from the outlet to the downstream through the opened nozzles with different paths. When the verification flow rate point is less than or equal to 150m 3/h, the first upstream manifold forced sealing ball valve 107 is closed, and the four-way nozzle connected with the lower end of the first upstream manifold 101 can realize verification, so that the pipe capacity is reduced, and the verification accuracy is improved; when the verification flow point is greater than 150m 3/h, the first upstream manifold forced sealing ball valve 107 is opened, and the second upstream manifold forced sealing ball valve 108 is closed, so that the influence of the pipe capacity on the right side in the detection is reduced. The maximum range of DN100 turbine flowmeter is not more than 1000m 3/h, so that the second upstream manifold forced sealing ball valve 108 is not required to be opened; when the DN150 high-precision flowmeter is verified, the first inlet 104 and the first upstream manifold forced sealing valve 107 are closed, verification gas enters the device through the third inlet 106, and is discharged from the outlet to the downstream through the opened nozzles with different paths. The maximum range of DN150 turbine flowmeter is not more than 2000 m 3/h, the second upstream manifold forced sealing ball valve 108 is not required to be opened, and the influence of the pipe capacity in five nozzles connected with the lower end of the third upstream manifold 103 during detection is reduced.
In the design process of the elm checking point of the national petroleum and natural gas large-flow metering station, the device is adopted to realize the verification of the working level standard flowmeter and other high-precision flowmeters. The tube capacity of the small flow detection is reduced by 1.3m 3, and the uncertainty of system measurement in the detection is improved. Calculation process:
1) Calculation Guan Rong v1=1.457 m 3 of device non-optimization, and natural gas stock standard working condition volume v10=43×v1= 62.65m 3 when detected at 4.2 MPa;
2) And calculating Guan Rong V2=0.162 m 3 after device optimization, and carrying out natural gas storage standard working condition volume V20=43×V2=6.97 m 3 in the process of 4.2MPa detection.
According to the verification specification, the pressure fluctuation is ensured not to exceed 0.5%, and under the condition that the temperature is kept unchanged, the volume change quantity DeltaV= (V1-V2) ×0.5% = 0.28m 3 of the standard working condition of the pipe capacity natural gas storage quantity influences the maximum uncertainty of the flow measurement value to be uq= (DeltaV/V2) 1/2 =0.2. The invention simplifies the number of zero-leakage forced seal ball valves, reduces the investment cost of the device by about 50 ten thousand dollars and the maintenance cost of the valve by 20 ten thousand/year. The parts of the device related to the invention are all existing devices and can be directly purchased in the market.
The foregoing examples are merely illustrative of the present invention and are not intended to limit the scope of the present invention, and all designs that are the same or similar to the present invention are within the scope of the present invention. Devices and structures not described in detail in the present invention are all prior art, and will not be described in detail.
Claims (6)
1. A natural gas high-flow real-flow verification secondary standard method is characterized in that: the natural gas high-flow real-flow verification secondary standard device is adopted, and comprises an upstream collecting pipe (1), a downstream collecting pipe (2) and fifteen paths of critical flow nozzles (3) which are arranged in parallel; the lower end of each critical flow nozzle (3) is communicated with the downstream collecting pipe (2), and the upper end of each critical flow nozzle (3) is communicated with the upstream collecting pipe (1); a rectifier (4) is arranged at the upstream of each critical flow nozzle (3), and a telescopic device (5) is arranged at the downstream of each critical flow nozzle (3); the upstream collecting pipe (1) comprises a first upstream collecting pipe (101), a second upstream collecting pipe (102) and a third upstream collecting pipe (103), wherein the first upstream collecting pipe (1) is connected with the second upstream collecting pipe (2) through a first collecting pipe forced sealing ball valve (107), and the second upstream collecting pipe (2) is connected with the third upstream collecting pipe (3) through a second collecting pipe forced sealing ball valve (108); two inlets are arranged on the first upstream collecting pipe (101), a first inlet (104) and a second inlet (105), a pipeline of the first inlet (104) is DN250, and a pipeline of the second inlet (105) is DN100; a third inlet (106) is arranged on the second upstream collecting pipe (102), and the pipeline of the third inlet (106) is DN150;
the method for verifying the secondary standard of the natural gas high-flow real-flow comprises the following specific steps of:
1. When the standard flow meter group is tested or DN250-DN300 high-precision flow meters are tested, test gas enters the first upstream collecting pipe (101) through the first inlet (104), and is discharged to the downstream from the outlet through the opened critical flow nozzles (3) with different paths;
A. When the verification flow point is less than or equal to 150 m 3/h, closing the first manifold forced sealing ball valve (107), and simultaneously opening a four-way critical flow nozzle (3) arranged at the lower end of the first upstream manifold (101);
B. When the verification flow point is 150m 3/h—2000 m3/h, opening the first manifold forced sealing ball valve (107), closing the second manifold forced sealing ball valve (108), and simultaneously opening a nozzle connected with the lower end of the second upstream manifold (102);
C. When the verification flow point is more than 2000 m 3/h, opening a second manifold forced seal ball valve (108);
2. when the DN50-DN100 high-precision flowmeter is detected, the first inlet (104) is closed, the detected gas enters the first upstream collecting pipe (101) through the second inlet (105), and is discharged to the downstream from the outlet through the opened critical flow nozzles (3) with different paths;
A. Closing the first manifold positive seal ball valve (107) when the verification flow point is less than or equal to 150 m 3/h;
B. When the verification flow point is greater than 150 m 3/h, opening the first manifold forced sealing ball valve (107) and closing the second manifold forced sealing ball valve (108);
3. When the DN150 high-precision flowmeter is detected, the first inlet (104), the second inlet (105) and the first manifold forced sealing ball valve (107) are closed, the detected gas enters the third upstream manifold (103) through the third inlet (106), and is discharged from the outlet to the downstream through the opened critical flow nozzles (3) with different paths.
2. A natural gas high flow real flow verification secondary standard method as claimed in claim 1, wherein: the first upstream manifold (101) is connected with four critical flow nozzles (3), the four critical flow nozzles (3) are DN50 nozzles, and the flow rates are 10m 3/h、20 m3/h、40 m3/h and 80m 3/h respectively; the first upstream header (101) is DN250.
3. A natural gas high flow real flow verification secondary standard method as claimed in claim 1, wherein: the second upstream manifold (102) is connected with six paths of critical flow nozzles (3), the six paths of critical flow nozzles (3) are DN100 nozzles, wherein the flow rates of two critical flow nozzles (3) are 160 m 3/h and 320 m 3/h respectively, the flow rates of the other four critical flow nozzles (3) are 400 m 3/h respectively, and the second upstream manifold (102) is DN300.
4. A natural gas high flow real flow verification secondary standard method as claimed in claim 1, wherein: the third upstream manifold (103) is connected with five paths of critical flow nozzles (3), the five paths of critical flow nozzles (3) are DN100 nozzles, and the flow rates are 400 m 3/h; the third upstream manifold (103) is DN300.
5. A natural gas high flow real flow verification secondary standard method as claimed in claim 1, wherein: the lower forced sealing ball valve (7) is arranged at the downstream of the telescopic device (5).
6. A natural gas high flow real flow verification secondary standard method as claimed in claim 1, wherein: the upper end of the rectifier (4) is provided with an upper forced sealing ball valve (6).
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103837215A (en) * | 2014-03-25 | 2014-06-04 | 重庆市计量质量检测研究院 | Reversing valve type pVTt-method gas flow device |
| CN206387479U (en) * | 2017-01-24 | 2017-08-08 | 中国石油化工股份有限公司天然气分公司计量研究中心 | It is a kind of to reduce the Natural gas flow meter verification apparatus that tube capacity improves the calibrating degree of accuracy |
| CN207908020U (en) * | 2017-12-30 | 2018-09-25 | 西安长庆科技工程有限责任公司 | A kind of natural gas big flow reality stream calibrating secondary standard device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107300404A (en) * | 2017-06-07 | 2017-10-27 | 北京东方华智石油工程有限公司 | Natural gas flowmeter verification system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103837215A (en) * | 2014-03-25 | 2014-06-04 | 重庆市计量质量检测研究院 | Reversing valve type pVTt-method gas flow device |
| CN206387479U (en) * | 2017-01-24 | 2017-08-08 | 中国石油化工股份有限公司天然气分公司计量研究中心 | It is a kind of to reduce the Natural gas flow meter verification apparatus that tube capacity improves the calibrating degree of accuracy |
| CN207908020U (en) * | 2017-12-30 | 2018-09-25 | 西安长庆科技工程有限责任公司 | A kind of natural gas big flow reality stream calibrating secondary standard device |
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