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Significance and Use
The results of this test method may be used to determine nitrogen oxides and carbon monoxide emission concentrations from natural gas combustion at stationary sources.
This test method may also be used to monitor emissions during short-term emission tests or periodically in order to optimize process operation for nitrogen oxides and carbon monoxide control.
1.1 This test method covers the determination of nitrogen oxides (NO and NO2), carbon monoxide (CO), and oxygen (O2) concentrations in controlled and uncontrolled emissions from natural gas-fired reciprocating engines, combustion turbines, boilers, and process heaters using portable analyzers with electrochemical sensors. Due to the inherent cross sensitivities of the electrochemical cells, this test method should not be applied to other pollutants or emission sources without a complete investigation of possible analytical interferences and a comparative evaluation with EPA test methods.
1.1.1 The procedures and specifications of this method were originally developed during laboratory and field tests funded by the Gas Research Institute (GRI). Comparative emission tests were conducted only on natural gas-fired combustion sources. Subsequently, the United States Environmental Protection Agency (EPA) sponsored Environmental Technology Verification (ETV) program conducted further evaluations of electrochemical cell analyzers, which included laboratory tests and field tests on natural gas and diesel-fueled generators. The EPA has reviewed the ETV test results, published additional information, and provided technical input that has been considered in the update of this method.
1.2 This test method contains notes that are explanatory and are not part of the mandatory requirements of the standard.
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and to determine the applicability of regulatory limitations prior to use.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D1356 Terminology Relating to Sampling and Analysis of Atmospheres
EPA Methods from 40 CFR Part 60, Appendix AMethod20 - Determination of Nitrogen Oxides, Sulfur Dioxide, and Diluent Emissions from Stationary Gas Turbines
EPA Methods from 40 CFR Part 63, Appendix AMethod301 --Field Validation of Pollutant Measurement Methods from Various Waste Media
EPA Methods from 40 CFR Part 75, Appendix HRevisedTraceabilityP Protocol G1 and G2 Procedures EPA-600/R-97/121, EPA Traceability Protocol for Assay and Certification of Gaseous Calibration Standards, September 1997, as amended August 25, 1999. Available from: http://www.epa.gov/ttn/emc/news.html.
ICS Number Code 13.040.50 (Transport exaust emissions)
UNSPSC Code 40102000(Boilers); 77101500(Environmental impact assessment)