1. APMP TCFF Country Report CMS/ITRI, Chinese Taipei Chun-Min Su, Ph.D. Dec. 5, 2011 Kobe, Japan

2. Copyright 2010 ITRI 工業技術研究院 2 Contents Stabilization of Gas Temperature for Low Pressure Gas Flow Facilities – Bell Provers Study on the Method of Calibration for the High Pressure Gas Flow Facility (with Sonic Nozzle as the Working Standard)

3. Copyright 2010 ITRI 工業技術研究院 3 Low P. Gas Flow Facility - Bell Prover 60 L Bell (4-100) L/min U = 0.15 % 600 L Bell (20-1000) L/min U = 0.11 %

4. Copyright 2010 ITRI 工業技術研究院 Comparison between the Bell Provers: Before

5. Copyright 2010 ITRI 工業技術研究院 Measures for Gas Temp. Stabilization 5 Water Bath Heat Exchanger Airflow Shield Thermal Isolation Cloth

6. Copyright 2010 ITRI 工業技術研究院 V pr 1 V B1 PmPm TmTm Nozzle Water Bath Heat Exchanger Air Tank P M Heat Exchanger Diverter Valve Schematic of the Bell Prover

7. Copyright 2010 ITRI 工業技術研究院 Comparison between the Bell Provers: After

8. Copyright 2010 ITRI 工業技術研究院 8 Contents Stabilization of Gas Temperature for Low Pressure Gas Flow Facilities – Bell Provers Study on the Method of Calibration for the High Pressure Gas Flow Facility (with Sonic Nozzle as the Working Standard)

9. Copyright 2010 ITRI 工業技術研究院 9 Weighing + Nozzle (15 to 18000) m 3 /h U = 0.18 % High Pressure Air Flow Facility @ CMS

10. MUT Acoustic filter 600 cm ( ~ 40D) 95 cm 110 cm downstream compact nozzle bank - for back pressure adjustment MUT The nozzle bank is firstly calibrated by gravimetric method with a gyroscope weighing system. Another compact nozzle bank is installed at the downstream of the pipeline for calibration flow and pressure adjustment. In our high pressure air flow facility, an upstream compact nozzle bank is used to calibrate meters from customers.

11. Copyright 2010 ITRI 工業技術研究院 Test Results The calibration curve appears to be inclined. The temp. drop during calibration increased with the increasing flowrate. At max. flowrate of 1000 m 3 /h, the temp. drop even close to 3.0 ℃ /min. Response time of the temp. sensor might be an issue and we are conducting some test about this. 11 of a SICK ultrasonic flow meter (USM) installed downstream of the upstream nozzles and calibrated by the upstream nozzles Actual

12. SICK USM installed upstream of the upstream compact nozzle bank. upstream Compact nozzle bank

13. Copyright 2010 ITRI 工業技術研究院 Test Results With similar flowrate at standard condition, the temp. drops during calibration were significantly lower than those when meter was installed downstream of the upstream nozzles. The calibration curve appears to be horizontal. 13 of the USM installed upstream of the upstream nozzles and calibrated by the upstream nozzles Actual

14. Copyright 2010 ITRI 工業技術研究院 Test Results The calibration curve appears to be horizontal. The discharge coefficient (C d ) of the sonic nozzles were based on the empirical data given in ISO 9300. Each nozzle will be calibrated by the upstream nozzles in the future. 14 P = 10 bar of the USM installed upstream of the upstream nozzles and calibrated by the downstream nozzles

15. Copyright 2010 ITRI 工業技術研究院 Concluding Remarks For blow-down type gas flow facility, the continuously decreasing temp. of the gas while performing meter calibration is unavoidable. Therefore, to reduce the effect of unstable gas temp. on the calibration results is important. To reduce the temp. drop during calibration, we will expand the volume of the gas storage tank. Meanwhile, the USM will be installed upstream of the compact nozzle bank while being calibrated. We are now conducting some tests of calibrating the USM using the downstream compact nozzle bank. We are also investigating the response time of the temperature sensor and how it can be improved. 15 for the Study on H.P. Gas Flow Facility

16. Copyright 2010 ITRI 工業技術研究院 16 Thanks for your attention! Contact: Chun-Min Su, Ph.D. TEL: +886-3-5741205 FAX: +886-3-5710335 email: CMSu@itri.org.twCMSu@itri.org.tw