H. Hu, Z. Cheng, P. Gruber, Z. Wang
Ultrasonic Transit-time method is a good choice to measure the open channel discharge. To investigate its performance in the rectangular open channels, a 26 m long, 2 m wide, 1.2 m deep open channel facility was built with an over-fall head tank providing a very stable flowrate of 1.5 m³/s in maximum and 39 typical cases were tested. The tested results verified that ultrasonic transit-time method can be well used to measure the discharge in rectangular open channels. However, due to unavoidably disturbing the flow patterns and introducing some errors, thus the transducers should be made as...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.087
· Download
Dannal Cheng, Feng Gao, Junfeng Mao, Shi Wu, Xinli Dong, Han Zhang, Qian Zhang
At present, the way to check the flowmeter accuracy is disassemble them and send to flow lab and verify it. But customer don’t like it, because it will affect or stop their production. What the customer really need is toknow the meter accuracy but non-disassemble flowmeters. It is not an easy way, this paper describes a feasible solution about inline comparison of gas flowmeter by inline drilling, inline installation, power supplyand data recording & analysis. In the end, cited a field case about comparison of gas flowmeter.
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.086
· Download
Wang Lei, Zhang Yinan, Liu Yuan, Meng Tao
In recent years, calibration demands of automatic monitoring stations for atmospheric radiation environment inChina are increasing. However, large flow samplers in monitoring stations are relatively large, so dismountingand transportation will result in significant cost. While the monitoring stations may be dozens or evenhundreds of kilometers apart and the cost of field testing is too high, so the values couldn’t be guaranteed. Inthis paper, a set of remote calibration device for large flow samplers based on master meter method is developed, which is a fully automated calibration system....
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.085
· Download
Han Xu, Zheng Hongwei, Song Chaofan, Zhou Lei, Wu Yan, Hong Bingyuan, Wen Kai
With the rapid development of the natural gas industry, the natural gas measurement handover volume is increasing year by year, and the calibration of natural gas flowmeter is becoming more and more important. This paper defines and demonstrates the framework of a fully automated controller for natural gas flowmeter calibration stations, from conceptualization to field test. When the calibrated flowmeter is installed on bench, the controller will identify the corresponding process by success tree algorithm. It checks whether the current process is appropriate, and automatically switch the...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.084
· Download
Wei Han, Can Li, Nan Sun, Chuanbo Zheng, Guanwen Huang, Chaofan Song, Chunhui Li
MT primary standard facility is the highest standard of natural gas metering field in China. In order to improvethe capability level of the facility, the station took a series of measures. By adding a spherical tank insulation layer, changing the sampling position of the chromatograph and so on. After that, a new method was used to re-evaluate the uncertainty of the facility. At the same time, two nozzles were selected to carry out therepeatability and stability test, and the test results met the requirements of uncertainty. Afterall, the uncertaintylevel of the facility is increased from...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.083
· Download
L. Cordova, I. Marfenko, A. Pfau, L. Shen
Given their simplicity, flow calibration facilities using flowmeters as reference standards are very common. The present paper introduces a method to estimate calibration facility uncertainty considering empirically determined correlation effects under working conditions. This improvement strongly increases the confidence in flowmeter-based calibration facilities of the particular type used, making third-party recognition of calibration services more reliable and transparent. A special type of calibration facility having multiple reference flowmeters installed both in-series and in-parallel,...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.082
· Download
Tao Meng, Lei Wang, Zhou Chang, Chao Xing,Huichao Shi
Extra uncertainty is introduced to the result of flowmeter calibration by flow fluctuations in the flow standard facility. Identifying sources of fluctuations is important for the location and elimination of the fluctuation sources in the flow standard facility, however it is difficult to diagnose the direction of fluctuation source when multiple sources exist. A correlation analysis method based on Empirical Mode Decomposition (EMD) utilizing the signals of pressure sensor and flowmeter is proposed to diagnose the directions of different fluctuation sources. The proposed method could...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.081
· Download
Chaojian Tao, Jiaodan Chen, Liqiong Huang, Shuqiang Chen, Shuxi Lin, Qiang Lin, Zeng Hong
The high-pressure loop gas flow standard facility (hereinafter referred to as the facility) is a working measurement standard [1] for gas flowmeters to perform measurement performance tests under different pressures. It can study and improve the measurement performance of flowmeters under different pressures and different gas media, which is of great significance to the research of flow measurement technology. This paper studies the temperature control technology of the facility, the purpose is to make the temperature meet the working requirements of the facility and as close as possible to...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.080
· Download
Wanli Yang, Xingen Wang, Yujie Chen, Yuming Shen
The function expression of the flow characteristics of rotary flow diverters was deduced. It can be seen from the expression that when the splitter plate of the diverter moves at a constant speed through the nozzle slot,the optimal flow characteristic curve with an approximately linear relationship is obtained. A flaw of the “Biryukov curves” was pointed out. It is also proposed that the essence of the flow diverter timing error Δt isthe error caused by the installation asymmetry and the flow characteristic asymmetry, not the travel difference. The tow computational equations of timing error...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.079
· Download
Liu Wei, Li Li, Chen Wei, Zhan Jiao, Liu Yahui
In this paper, the flow measurement performance of the ambient air sampler is studied, which is widely used in environmental monitoring, health care and mining enterprises. The paper develops the flow rate performance test device of ambient air sampler, which consists of the high-low temperature test device, the load performance test device, the flow standard device and the pressure measurement device. For various types of ambient air samplers and its calibrators, the device can carry out flow performance tests with the flow range of 10 mL/min ~ 265 L/min, with flow indication error no more...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.078
· Download