COLORADO ENGINEERING. CERTIFICATE OF CALIBRATION Traceable to the NATIONAL INSTITUTE OF STANDARDS AND TECHNOLOGY

Transcription

1 CERTIFICATE OF CALIBRATION Traceable to the NATIONAL INSTITUTE OF STANDARDS AND TECHNOLOGY Customer: Item Calibrated: Ultrasonic Flowmeter Address: Model: CEESI Data File(s): Serial Number: Test Date: Job Number: Order: The uncertainty in flowrate indicated by CEESI standards is estimated to be +/- 0.23% of reading to 95% confidence. The calibration identified by the above CEESI DATA FILE was performed in accordance with the American Gas Association Transmission Committee Report Number 9 using calibration standards that are traceable to the National Institute of Standards and Technology. All natural gas properties were calculated in compliance with American Gas Association Report Number 8. Calibration Performed at: CEESI Iowa High Flow Natural Gas Facility th Street Garner, IA Calibration Performed by: Allan Luppen Bryan Trostel Measurement Assurance Bill Johansen On behalf of Colorado Engineering Experiment Station, Inc. NOTE: This Certificate and accompanying documentation shall not be reproduced, except in full, without the written consent of Colorado Engineering Experiment Station Inc.

2 Uni-Directional Calibration Configuration Details Figure 1: Piping Configuration Tube Identification: Identifier Length Serial Number B - Upstream Tube 40.0 Inches D - Inlet Tube 80.0 Inches E - Exit Tube 40.0 Inches Flow Conditioner Identification: Identifier Installed Manufacturer Serial Number Flow Arrow C - Upstream Flow Conditioner No NA NA NA NA Top Dead Center Thermowell Identification: Identifier Distance to Closest Flange Face Quantity F - Exit Thermowell 24.0 Inches 2 Fitting Identification: Identifier A - Entrance Fitting G - Exit Fitting Type Straight Pipe Straight Pipe installed with CEESI flow tubes and manually aligned. Page 2 of 9

3 and Calibration Parameters: Calibration of a Ultrasonic Flowmeter Model: Bore Diameter: Output: Modbus Test Medium: Natural Gas Serial Number: Electronics Serial Number: SPU Revision Number: Test Date: CEESI Data File(s): Gas Composition During Test: Component Calibration Beginning Normalized Mole Percent Calibration Ending Normalized Mole Percent Verification Beginning Normalized Mole Percent Verification Ending Normalized Mole Percent Methane Nitrogen Carbon Dioxide Ethane Propane Hydrogen Iso-Butane Normal-Butane Iso-Pentane Normal-Pentane C Helium Heating Value (BTU/ft³) Total Un-Normalized Table 1: Gas Composition Page 3 of 9

4 Calibration Results The calibration results are summarized in the table below. The column labeled 'Calibration Factor' is the value by which the volume flowrate is multiplied to achieve the corrected value. CEESI Flowrate Flowrate Velocity Calibration Factor Percent Error[%] Table 2: Calibration Results The uncertainty due to systematic effects present in the calibration facility is estimated to be ±0.23% at a 95% level of confidence. Upon Completion of the calibration the coefficients listed below were input into the meter and then the meter was put into a Read Only mode. Register Name Value Register Name Value 328 FwdFlwRt FwdMtrFctr FwdFlwRt FwdMtrFctr FwdFlwRt FwdMtrFctr FwdFlwRt FwdMtrFctr FwdFlwRt FwdMtrFctr FwdFlwRt FwdMtrFctr FwdFlwRt FwdMtrFctr FwdFlwRt FwdMtrFctr FwdFlwRt FwdMtrFctr FwdFlwRt FwdMtrFctr FwdFlwRt FwdMtrFctr FwdFlwRt FwdMtrFctr12 1 Table 3: Coefficient Inputs Page 4 of 9

5 Calibration Results Ultrasonic Flowmeter S/N: CEESI Iowa Calibration Curve Error (%) Velocity (ft/sec) Figure 2: Calibration Results Page 5 of 9

6 Calibration Results Table of Calibration Data: Press. (psia) Temp. ( R) Density [lbm/ft³] Lab. Error [%] Calc. Error [%] Table 4: Calibration Results Page 6 of 9

7 Verification Results The Verification results are summarized in the table below. The column labeled 'Calibration Factor' is the value by which the volume flowrate is multiplied to achieve the corrected value. CEESI Flowrate Flowrate Velocity Calibration Factor Percent Error[%] Table 5: Verification Results The uncertainty due to systematic effects present in the calibration facility is estimated to be ±0.23% at a 95% level of confidence. Ultrasonic Flowmeter Data File S/N: CEESI Iowa Calibration Curve Error (%) Velocity (ft/sec) Figure 3: Verification Results Page 7 of 9

8 Verification Results Table of Verification Data: Press. (Psia) Temp. ( R) Density [lbm/ft³] Lab. Error [%] Calc. Error [%] Table 6: Verification Results Page 8 of 9

9 Uncertainty Analysis The uncertainty analysis for the Iowa facility is performed using methods documented in the ISO GUM and NIST Tech. Note Each component of uncertainty is classified as Type A or Type B and assigned a statistical distribution (normal or rectangular). Numerical values for standard uncertainty, degrees of freedom and correlation coefficients are estimated. Standard uncertainty values are propagated by addition in quadrature as described in the ISO GUM. The effective degrees of freedom are estimated using the Welch-Satterthwaite approximation. A detailed copy of the uncertainty analysis is available from CEESI Traceability Traceability of pressure, temperature and gas composition measurements is maintained based on traditional instrument calibration. Traceability of flowrate measurement is based on periodic engineering analysis of data from three sources: 1) control charts 2) turbine substitution test 3) direct turbine meter calibrations Page 9 of 9