High pressure gas flow calibration facility at CMS

High pressure gas flow calibration facility at CMS Jiunn-Haur Shaw Center for Measurement Standards/ITRI, Taiwan 2013 APMP TCFF Workshop, Taipei, Taiwan November 22 -23, 2013

Outline • • Natural Gas Calibration Infrastructure Calibration Facilities at CMS Thermal effect and

Transmission and Distribution Pipeline LNG import 20% Household 80% 12 Power. Gen -Total Pipe Length: 1, 892 KM -Natural Gas 2. 5 folds increase in 10 years -Total of 12 TP & IPP power plants -Total NG usage over 15 BM 3 custody transfer meters (DN 250 to DN 600) Copyright 2013 ITRI 業技術研究院 3

Establishment of a National High-Pressure Natural Gas Flow Measurement Infrastructure • • • Needs: On-site metrological control of large capacity NG measurement instruments in a Power Plant Approach: (1) Establish QS & physical traceability chain with national standard through transfer standards (TS) calibrated in CMS to attain global equivalence under CIPM MRA scheme (2) Combine 2 -3 standard meters to cascade up flow capacity through un-broken chain of calibration (3) On-site comparison and control check of 600 mm ultrasonic custody transfer meters (USM) Benefits: (1) Assure quality control and measurement accuracy for energy transaction between Chinese Petroleum Corp (CPC) and Taiwan Power Company (Tai Power); (53 bars operation pressure, 1. 65 MM tons/yr) (2) Through the dissemination of national standard to on-site calibration with proper QS implementation, NML contributes to the reduction of global warming equivalent to CO 2 emission of 4 MM tons/yr Weighing + Nozzle (15 -18000) m 3/h U = 0. 18 %, 60 bars Re-circulating HP system 4000 m 3/h @(10 to 60) bar U = 0. 45 % CMS High Pressure Air Flow Facility, participated CIPM. FF-K 5 b Copyright 2013 ITRI 業技術研究院 CPC High Pressure Air Flow Facility (a Partner Laboratory of NML) On-site practice @ Taiwan Power metering station Four 300 mm USM TS in parallel

Establishment of a National High-Pressure Natural Gas Flow Measurement Infrastructure Calibration on Standard Meters in NML + "USM 6 + Standard Pressure Gauge Standard Temperature Gauge High pressure Air flow Calibration System NMLTemperature Calibration System Pressure Calibration System Calibration on Standard Meters in CPC Secondary Facility "USM 12 CPC Secondary High pressure Air flow Calibration System NML Temperature Calibration System + + NML Pressure Calibration System Pressure Gauge Temperature Gauge Calibration & Correction on Meters in Taiwan. Power LNG Station + " CPC 12"USM NML Temperature Calibration System NML Pressure Calibration System + Pressure Gauge Copyright 24 2013 ITRI 業技術研究院 USM Temperature Gauge

• Calibration Facilities at CMS Copyright 2013 ITRI 業技術研究院 6

CMS High Pressure Air Flow Calibration Facility gyroscopic weighing scale • • • 160 kg measurement capacity with 2 -gram resolution • 0. 013% measurement uncertainty with collecting weight ≧ 20 kg 7 SN 1 -50 bar 15 -18000 Nm 3/h Gravimetric method – Gyroscopic scale Reference standard – Compact sonic nozzle array (CSNA) – Uncertainty: 0. 18% Copyright 2013 ITRI 業技術研究院 7

Primary Standard ØCMC maintained through CCM-KC 5 b § Global Key Comparison organized by BIPM-CCMWorking group Fluid Flow § Measurement Capability Harmonized with PTB/Germany, LNE/France, NEL/UK and KRISS/Korea indicated by En<0. 5 Copyright 2013 ITRI 業技術研究院

Some features of HP system • HP system ~30 s calibration time @Max flow • Temp drops ~3 degree C @Max flow • @Max Pressure, flow rate ~200 Am 3/h • Time of flight USM, time difference matter • 1 -4 time pressure range claimed by manufacturer, No Temperature dependent Copyright 2013 ITRI 業技術研究院 9

Calibration of Working Standards of CPC’s High Pressure Air Flow Facility CPC’s WS: Four DN 150 USM (Elster-Instromet Q. Sonic-4 Series-IV QL) 0. 4 % 0. 5 % • Issues Concerned p thermal effect due to storage capacity limitation and Joule-Thomson effect p short calibration time (50 s@1000 m 3/h) 0. 4 % 0. 5 % of temperature measurement p possible time-delay 0. 4 % • All had been calibrated at SWRI in 2008 with meter factor adjusted to nearly 1 Copyright 2013 ITRI 業技術研究院 10

Calibration of 12” USM at four different years Copyright 2013 ITRI 業技術研究院

Improvements on Primary Facility • Expanding air storage tank from 19 m 3 to 34 m 3 – completed in 2012 • Use downstream CSNA to calibrate USMs： new CSNA installed downstream of MUT, (totally 1000 m 3/h @ 1 atm) – completed in 2012 Copyright 2013 ITRI 業技術研究院 12

CMS’s Re-Circulating Loop • • • Working standard: two DN 100 IRPP meters Checking standard: DN 150 SICK USM (FLOWSIC 600) Maximum operating flowrate： 700 Am 3/h Operating pressure range: 1 bar to 50 bar Temperature variation : < 0. 2 ℃/min U ≈ 0. 25 % (k = 2) MUT SICK USM Copyright 2013 ITRI 業技術研究院 IRPP 13

Thermal Effect & Some Test Results Copyright 2013 ITRI 業技術研究院 14

(1)Study Thermal Effect Response time of temperature measurement – Comparing temperature measurements by PRT sensor and SOS data PRT sensor part (d = 1. 58 mm) gas composition Pmeasured Iteration by REFPROP (v. 9. 0) until SOStheo = SOSdiag Tacoustic Tmeasured = Ti Thermal Symmetry Indicator (TSI) Radial positions of the four acoustic paths Copyright 2013 ITRI 業技術研究院 no stratification severer stratification 15

Results and Discussion - Response time of temperature measurements blow down type facility upstream CSNA as WS 80 m 3/h@10 bar (2) (1) MEPAFLOW 600 with burst mode, record cycle rate increased to 10 records/s (3) (4) Formal calibration begins (1) pressurizing the upstream CSNA (2) pressure adjustment of the upstream CSNA (3) waiting for stability of flow (4) Formal calibration begins Copyright 2013 ITRI 業技術研究院 16

Response time of temperature measurements - different flowrate conditions blow down type facility, upstream CSNA as WS TSI < 1 80 m 3/h@10 bar 1000 m 3/h@10 bar • SOS, PRT temperature gradient appeared the same • temperature gradient increases with increasing flowrates • severer thermal stratification effect at higher flowrate Copyright 2013 ITRI 業技術研究院 17

Response time of temperature measurements - before and after improvements blow down type facility, upstream CSNA as WS, 1000 m 3/h@10 bar before after • lower temperature gradient after expanding the capacity of the upstream air storage tank Copyright 2013 ITRI 業技術研究院 18

Response time of temperature measurements - upstream/downstream CSNA blow down type facility, 1000 m 3/h@10 bar TSI → 1 upstream CSNA downstream CSNA • DN CSNA has lower air temperature gradient (eliminate Joule-Thomson effect at the MUT) • thermal stratification effect has also been reduced Copyright 2013 ITRI 業技術研究院 19

(2)Calibration of USM 1. Two-USM package test at blow-down type facility with upstream CSNA (four E-I USM against the same SICK USM) 2. Two-USM package test at blow-down type facility with downstream CSNA (one E-I USM against the SICK USM) 3. Calibration of SICK USM at blow down type facility and recirculating loop under the same operating conditions 4. CEESI calibration DN 150 SICK USM (FLOWSIC 600) DN 150 Elster-Instromet USM (Q. Sonic-4 Series-IV QL) SN: 0118, 0119, 0120 & 0121 Copyright 2013 ITRI 業技術研究院 Two-USM package 20

Calibration of two-USM package blow down type facility, upstream CSNA as WS, (80 -1000) m 3/h@10 bar DN 150 SICK USM (FLOWSIC 600) DN 150 Elster-Instromet USM (Q. Sonic-4 Series-IV QL) SN: 0118, 0119, 0120 & 0121 CPC’s working standards Two-USM package SICK USM • the meter error of the SICK USM was consistent within a deviation of ± 0. 2 %, suggesting stable operating conditions during calibration of both meters Copyright 2013 ITRI 業技術研究院 21

Calibration of two-USM package - upstream/downstream CSNA blow down type facility, (80 -1000) m 3/h@10 bar DN 150 SICK USM (FLOWSIC 600) obvious DN 150 Elster-Instromet USM inconsistent (Q. Sonic-4 Series-IV QL) SN: 0120 CPC’s working standard Two-USM package SICK USM • a deviation within ± 0. 2 % except for the maximum flowrate condition Copyright 2013 ITRI 業技術研究院 22

Calibration of SICK USM 1. (20 -1600) Nm 3/h at SICK and CMS/blow down type facility 2. (80 -1000) m 3/h@10 bar at CMS atmospheric conditions • results agreed well between SICK and CMS Copyright 2013 ITRI 業技術研究院 10 bar • repeatability was improved at higher flowrates • results were consistent with flowrate < 400 m 3/h • need further test at higher flowrate 23

Calibration SICK USM@CEESI Pressure effect? Copyright 2013 ITRI 業技術研究院 24

Observation FOR Experience on USM calibration • SHOULD be no Temperature and little Pressure effects on USM. Manufacturer info and basic principle of USM • Year to year variation in 6” USM Transfer standards • SICK meter appeared consistent, @atm, @blowdown/re-circulating • Additional tests at CEESI gave different perspectives and need further investigation on SICK meter • Need more tests on both 6”TS and SICK USM FOR High Pressure System • Increase upstream air storage capacity, reduces pressure and temperature drops and thus, the time-delay problem of PRT measurement has been alleviated • Re-circulating loop a good tool to save calibration time and high pressure calibration Copyright 2013 ITRI 業技術研究院 25

Current Progress • Studying pressure effect on the calibration of an USM by re-circulating loop – Replacing working standard for CMS’s re-circulating loop from two DN 100 IRPPs to five DN 50 Itron rotary meters: – Check pressure effect of USMs with re-circulating loop at 10 bar and 50 bar MUT SICK Rotary Meter USM Copyright 2013 ITRI 業技術研究院 26