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SRI/USEPA-GHG-VR-27 September 2003 checks—known as the loop test—consist of checking a current of known amount from the sensor against a Fluke multimeter to ensure that 4 mA and 20 mA signals are produced. These results were found to be within ± 0.01 mA. Reasonableness checks revealed that measured flow rates were within the range specified by the CHP Operator's Manual. The Test Plan also specified that gas flow rates recorded by the Rosemount meter would be compared to the site's rotary positive-displacement meter. Problems with the function of the facility meter prevented this additional QC check. The site meter had very poor index resolution and was not pressure- compensated. Therefore, a true flow-through comparison between meters was not conducted. The same Rosemount meter (meter components include precision bore spool, orifice plate and housing, pressure sensors, temperature sensor, and transmitter) was calibrated during a previous verification on a similar microturbine in August 2002. During this test, a true flow-through comparison with a calibrated displacement-type meter was performed [11]. The two meters were confirmed to agree be within ± 0.3 percent over the same range of gas flows as those experienced during this verification. 3.2.2.4. Fuel Lower Heating Value Fuel gas samples were collected twice per day during the controlled test periods. Two additional samples were collected during the extended monitoring period. Full documentation of sample collection date, time, run number, and canister ID were logged along with laboratory chain of custody forms and were shipped along with the samples. Copies of the chain of custody forms and results of the analyses are stored in the GHG Center project files. Collected samples were shipped to Empact Analytical Laboratories of Brighton, CO, for compositional analysis and determination of LHV per ASTM test Methods D1945 (ASTM 2001a) and D3588 (ASTM 2001b), respectively. The DQI goals were to measure methane concentrations within ± 3.0 percent of a NIST-traceable blind audit sample and to achieve less than ± 0.2 percent difference in LHV duplicate analyses results. Both DQIs were met with the methane accuracy at ± 0.51 percent and the LHV repeatability at ± 0.09 percent. Results of analysis of the audit sample are summarized in Table 3-5 and show acceptable accuracy for all major gas components. Table 3-5. Results of Natural Gas Audit Sample Analysis Gas Component Certified Component Concentration (%) Analytical Result for Initial Analysis (%) Analytical Result for Initial Analysis (%) Combined Sampling and Analytical Error (%)a Analytical Repeatability (%) Nitrogen 5.00 Carbon dioxide 1.01 Methane 70.41 Ethane Propane n-butane Iso-butane Iso-pentane n-pentane 5.17 5.17 3.4 0.0 1.00 0.99 1.0 1.0 70.05 70.18 0.5 0.2 9.01 9.06 9.05 0.6 0.1 6.03 6.07 6.07 0.7 0.0 3.01 3.03 3.03 0.7 0.0 3.01 2.99 2.99 0.7 0.0 1.01 1.02 0.98 1.0 3.9 1.01 1.01 0.98 0.0 3.0 a Calculated as: Error =(certified conc. – initial analytical result / certified conc.) * 100 3-9PDF Image | Environmental Technology Verification Report
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