New Development of International Gas Flow Measurement Technology

【Key words】 gas flow measurement device system, the development of the total flow meter technology [Abstract] article from the following six aspects reviewed the current international gas flow measurement technology, the latest advances; (1) in Canada TCC high pressure natural gas large Flow standard device, which is currently the world's most accurate high-pressure gas flow calibration station; (2) the new high-flow gas flow transfer standard ----- the world's first large-scale industrial rotating piston ; (3) a new generation of gas ultrasonic flowmeter; (4) a new gas waist wheel flowmeter; (5) for the international trade of natural gas delivery measurement system; (6) for a small amount of points of the new natural gas distribution metering system . The world's most accurate high pressure gas flow calibration station The world's only rotary piston (waist wheel) calibrator with calibration station "watch dog" WATCH BOG) ability. Use it to enable a more direct connection (traceability) from the primary gauge to the master datum, as detailed in the IRPP below. This traceability chain is secured and certified by NMI and is installed at WINNIPEG in Canada. The total uncertainty of TCC traffic calibration stations installed at WINNIPEG in Canada will reach 0.15% by the end of 2000. (Currently recognized as 0.2%). The IRPP Calibrator uses the latest ISS Supervisory Suite Software from the modern Instromet for all measurements, providing a fast, accurate and user-friendly interface. The ability to take full advantage of the full flow of information for all signals, including fast sampling of flow rates (only 3 seconds), to optimize measurement continuations (duration) is the basis for obtaining an objective result of the uncertainty. The system has been optimized to ensure perfect measurement results. It can make rapid error detection. The first IRPP for industrial use After extensive research and numerous experiments, Instromet's unique rotary piston (waist wheel) calibrator is now installed in Canada's TCC Flow Calibrator. The calibrator is based on a series of pulsation-free gas waist-wheel flow meters that provide highly accurate flow measurement over a wide range of pressures and flow rates. Its accuracy and repeatability, which are only achievable in the lab, make it quite possible to reduce the overall uncertainty of a flow calibration device. Figure 1 High pressure gas flow calibration station Industrial rotary piston calibrator (IRPP) of the main features; (1) high accuracy; (2) excellent repeatability; (3) calibration station installation has nothing to do; 4) Independent of gas temperature, pressure and composition; (5) Very wide range ratio; (6) Scalable; The IRPP system can be installed at a gas trading delivery metering station or at a flow test facility Where IRPP can be used as a backup delivery standard for routine, routine verification of other flowmeters. Its measurement core package (cassette core) is portable, making it easy to transport the core assembly to a traceable master (advanced verification laboratory). Dedicated software system can output fast response signal and reduce unnecessary data, so as to make the IRPP standard calibration meter for a realistic flowmeter. The latest generation of ultrasonic flowmeter ----- "sports car" the latest generation of gas ultrasonic flowmeter has emerged. The ultrasound transducer (sensor) of this outstanding flowmeter is vertically oriented with respect to the meter body, unlike conventional sensors that are inserted at an inclination. Designed for 4 "(100 mm) to 8" (200 mm) pipes, this new Q Sonic ---- 3 gas ultrasonic flowmeter is extremely compact and is designed for commercial gas delivery. The channel configuration is still based on a proven and patented double reflection principle, combined with a single reflection channel through the middle of the pipe. At present, the Q series ultrasonic flowmeter that has been produced is also the principle of combining the dual reflection channel and the single reflection channel. Mounting the sensor on the top half of the measuring tube is done on the one hand for ease of maintenance and on the other hand to prevent the build-up of liquid at the sensor cells (pockets, cavities). So this new generation of ultrasonic flowmeters can be better suited for wet gas applications. Another feature of the structural design of the new generation of ultrasonic flowmeters is that the option of replacing the sensor online with pressure is still a user-selectable option. There are tools specifically developed for this purpose. With this extraction tool, it is possible to change the sensor in just a few minutes without reducing the pressure in the pipe. For a new generation of ultrasonic flowmeter, the ultrasonic frequency has been increased to 200KHZ, the result is to improve the signal to noise ratio. This makes the new generation of ultrasonic flowmeters less sensitive to the noise generated by regulators or regulating valves. New Products for Gas Roots Flow Meters Technology As a replacement for the commonly used cartridge components in lumbar flowmeters, Instromet's engineers developed the IRM --- Type 3 with extremely compact metrology Gas waist wheel flow meter. It minimizes the amount of gas leaked through the measuring chamber while maximizing the volume (volume) of gas delivered by the pulley. The body of IRM ---- 3 is very strong and it is impossible to deform the body due to the misalignment in the installation. General conventional gas waist wheel flow meter installation, often due to the axis of the pipe and the axis of the flowmeter and the shell deformation, prone to waist stuck and stop the failure. IRM --- 3 will not happen such a stuck problem. In line with Instromet's tradition of expanding its precision measurement front, Instromet has developed the patented IRM DUO Gas Roots Flowmeter. It eliminates the main pulsations inherent in a common rover flow meter (essentially pulsations of gas flow). By finely mounting the coupled two pairs of pulleys in a watch body, the pulsations generated by each pair of pulleys are arranged just opposite each other to obtain a smooth (pulseless) flow of the air stream. This DUO principle has now been successfully applied to the larger diameter gas waist wheel flow meters of the IRM-1 series and to the IRM-3 gas waist wheel flow meters of 4 in. (100 mm) to 6 in. (150 mm) diameter. All of these new waist wheel flowmeter work, there is unparalleled silence and stability. IRM --- 3 Series gas waist wheel flow meter diameter of supply: 1.5 inches (40mm) - 6 inches (150mm), its corresponding flow measurement range is; 0.6 ---- 100m3 / h -38M, that is, G25-G650), the working pressure of gas up to 1.6MPa. The accuracy of this type of flowmeter is better than 1%, the repeatability is better than 0.1% and the turndown ratio is more than 1: 100. Gas operating temperature range: -300 ℃ --- 600 ℃. IRM --- 3 series of wheel flow meter has been approved by several of the world's leading authoritative measurement institutions can be used for the measurement of trade transportation. International Metrological Frontier Metering System The total energy system with 100% redundancy with 99.99% utilization has been achieved due to the use of Instromet's ISS monitoring sequence software package. ISS's advanced color graphics display has historical trends, alarms and extensive maintenance features. This makes the system very easy to run. Advanced computing includes both volume and quality measurements for the process and a complete flow library that supports redundancy. The metering system can be fully self-contained via the ISS system or a central computer. Various reports can be completely restructured according to specifications. There are available in-tranet support software. Instromet has been providing turnkey projects for a complete high-level border gas measurement system. Several projects have been completed: (1) Transitbus, WaIIbach, Switzerland: 1990 680 m3 / h at 6.75 MPa, 4 x 24 "Q. Shic and SM-RI-X turbines with analyzer chamber, (2) Turki BoIocIar station; at 7.5MPa, 120 × 104m3 / n, 4 × 24 "orifice plate, with the analyzer room, redundant PLC Redundant ISS system. (3) Masera Station, Italy; 230 x 104 m3 / h, 6 x 20 "Q.Sonic and SM-RI-X turbines at 6 MPa, with analyzer chamber, redundant PLCs, redundant ISS system. 4) Austria OMV Arnoldstein and Baumgarten station 1990 680 m3 / h at 6.75 MPa 4 x 24 "Q.Soh-ic and SM-RI-X turbines with analyzer chamber, redundant PLC, redundant ISS system. Natural gas distribution metrology systems provide a variety of conveniences and are easy to automate for smaller metering points. Instromet offers a cost-effective solution. The industrial-strength ISS supervisory (control) system used at the border metrology provides functions such as calculation, complex piping switching, energy calculation and completion of reporting. Mimic color images display makes the operation very easy. Any problems should be reported to the police to ensure that the operator to obtain the relevant information. Measurement results, archives and trends in the system make troubleshooting simple. The feature is that the connection to the central system, completed by Instromet, and the support through the modem are standard. Some examples of such systems that have been provided to users are as follows; (1) South Korea, South Korea Gas; 11 stations, 3 or 4 parallel metering ducts; 47 x 6 ", 8", 10 ", 12" and 16 "SM -RI --- X Turbine flowmeter, PLC for station control, ISS software for monitoring and management Automatic metering and automatic switching and reporting (2) Kiadan Station in Sarajevogas, Bosnia; 2 × 16 " 1 × 18 "SM-RI-X Turbine Meters, EncaI2000 Chromatograph, ISS for Supervision, Pipeline Switching and Reporting (3) GeIugor Station in Petronas, Malaysia; 6.9 MPa, 213 750 m3 / h, 3 × 8 "SM-RI-X Turbine Flowmeter, EncaI 2000 Chromatograph; for station-controlled PLC, automatic switching of metering lines, ISS for regulatory and reporting purposes. South Station, 7.5MPa, 500 × 144m3 / h and 1000 × 104m3 / h, 4 and 8 × 24 "Q.Sonic Flowmeters, PLC and ISS Surveillance Computers. (5) 22 metering stations in Greece and Depa Pressure station 5 × 104 --- 50 × 104m3 / h flow rate, SM-RI-X turbine flowmeter, pressure regulator. EncaI 2000 chromatograph, for telemetry and monitoring of P LC.

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