EPA Methods List with Links



US EPA Method 2B - Determination Of Exhaust Gas Volume Flow Rate From Gasoline Vapor Incinerators

 

NOTE: This method does not include all of the specifications (e.g., equipment and supplies) and procedures (e.g., sampling and analytical) essential to its performance. Some material is incorporated by reference from other methods in this part. Therefore, to obtain reliable results, persons using this method should also have a thorough knowledge of at least the following additional test methods: Method 1, Method 2, Method 2A, Method 10, Method 25A, Method 25B.

 

Necessary equipment for performing flow Method 2



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1.0 Scope and Application.

 

1.1 This method is applicable for the determination of exhaust volume flow rate from incinerators that process gasoline vapors consisting primarily of alkanes, alkenes, and/or arenes (aromatic hydrocarbons). It is assumed that the amount of auxiliary fuel is negligible.

 

1.2 Data Quality Objectives. Adherence to the requirements of this method will enhance the quality of the data obtained from air pollutant sampling methods.



2.0 Summary of Method.

 

2.1 Organic carbon concentration and volume flow rate are measured at the incinerator inlet using either Method 25A or Method 25B and Method 2A, respectively. Organic carbon, carbon dioxide (CO2), and carbon monoxide (CO) concentrations are measured at the outlet using either Method 25A or Method 25B and Method 10, respectively. The ratio of total carbon at the incinerator inlet and outlet is multiplied by the inlet volume to determine the exhaust volume flow rate.



3.0 Definitions.

 

Same as Section 3.0 of Method 10 and Method 25A.



4.0 Interferences.

 

Same as Section 4.0 of Method 10.



5.0 Safety.

 

5.1 This method may involve hazardous materials, operations, and equipment. This test method may not address all of the safety problems associated with its use. It is the responsibility of the user of this test method to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to performing this test method.



6.0 Equipment and Supplies.

 

Same as Section 6.0 of Method 2A, Method 10, and Method 25A and/or Method 25B as applicable, with the addition of the following:

6.1 This analyzer must meet the specifications set forth in Section 6.1.2 of Method 10, except that the span shall be 15 percent CO2 by volume.



7.0 Reagents and Standards.

 

Same as Section 7.0 of Method 10 and Method 25A, with the following addition and exceptions:



7.1 Carbon Dioxide Analyzer Calibration.

 

CO2 gases meeting the specifications set forth in Section 7 of Method 6C are required.



7.2 Hydrocarbon Analyzer Calibration.

 

Methane shall not be used as a calibration gas when performing this method.



7.3 Fuel Gas.

 

If Method 25B is used to measure the organic carbon concentrations at both the inlet and exhaust, no fuel gas is required.



8.0 Sample Collection and Analysis.



8.1 Pre-test Procedures.

 

Perform all pre-test procedures (e.g., system performance checks, leak checks) necessary to determine gas volume flow rate and organic carbon concentration in the vapor line to the incinerator inlet and to determine organic carbon, carbon monoxide, and carbon dioxide concentrations at the incinerator exhaust, as outlined in Method 2A, Method 10, and Method 25A and/or Method 25B as applicable.



8.2 Sampling.

 

At the beginning of the test period, record the initial parameters for the inlet volume meter according to the procedures in Method 2A and mark all of the recorder strip charts to indicate the start of the test. Conduct sampling and analysis as outlined in Method 2A, Method 10, and Method 25A and/or Method 25B as applicable. Continue recording inlet organic and exhaust CO2, CO, and organic concentrations throughout the test. During periods of process interruption and halting of gas flow, stop the timer and mark the recorder strip charts so that data from this interruption are not included in the calculations. At the end of the test period, record the final parameters for the inlet volume meter and mark the end on all of the recorder strip charts.



8.3 Post-test Procedures.

 

Perform all post-test procedures (e.g., drift tests, leak checks), as outlined in Method 2A, Method 10, and Method 25A and/or Method 25B as applicable.



9.0 Quality Control.

 

Same as Section 9.0 of Method 2A, Method 10, and Method 25A.



10.0 Calibration and Standardization.

 

Same as Section 10.0 of Method 2A, Method 10, and Method 25A.

NOTE: If a manifold system is used for the exhaust analyzers, all the analyzers and pumps must be operating when the analyzer calibrations are performed.

 

10.1 If an analyzer output does not meet the specifications of the method, invalidate the test data for the period. Alternatively, calculate the exhaust volume results using initial calibration data and using final calibration data and report both resulting volumes. Then, for emissions calculations, use the volume measurement resulting in the greatest emission rate or concentration.



11.0 Analytical Procedure.

 

Sample collection and analysis are concurrent for this method (see Section 8.0).



12.0 Data Analysis and Calculations.

 

Carry out the calculations, retaining at least one extra decimal figure beyond that of the acquired data. Round off figures after the final calculation.



12.1 Nomenclature.

 

COe = Mean carbon monoxide concentration in system exhaust, ppm.

(CO2)a = Ambient carbon dioxide concentration, ppm (if not measured during the test period, may be assumed to equal 300 ppm).

(CO2)e = Mean carbon dioxide concentration in system exhaust, ppm.

HCe = Mean organic concentration in system exhaust as defined by the calibration gas, ppm.

HCi = Mean organic concentration in system inlet as defined by the calibration gas, ppm.

Ke = Hydrocarbon calibration gas factor for the exhaust Hydrocarbon Analyzer, unitless [equal to the number of carbon atoms per molecule of the gas used to calibrate the analyzer (2 for ethane, 3 for propane, etc.)].

Ki = Hydrocarbon calibration gas factor for the inlet Hydrocarbon Analyzer, unitless.

Ves = Exhaust gas volume, m3.

Vis = Inlet gas volume, m3.

Qes = Exhaust gas volume flow rate, m3/min.

Qis = Inlet gas volume flow rate, m3/min.

1 = Sample run time, min.

s = Standard conditions: 20 EC, 760 mm Hg.



12.2 Concentrations.

 

Determine mean concentrations of inlet organics, outlet CO2, outlet CO, and outlet organics according to the procedures in the respective methods and the analyzers' calibration curves, and for the time intervals specified in the applicable regulations.

V_{es} = V_{is} \frac{K_{i}(HC_{i})}{K_{e}(HC_{e}) + [(CO_{2})_{e} - (CO_{2})_{a}] + CO_{e}} Eq. 2B-1



12.3 Exhaust Gas Volume.

 

Calculate the exhaust gas volume as follows:



12.4 Exhaust Gas Volume flow rate.

 

Calculate the exhaust gas volume flow rate as follows:

Q_{es} = \frac{V_{es}}{l} Eq. 2B-2



13.0 Method Performance. [Reserved]




14.0 Pollution Prevention. [Reserved]




15.0 Waste Management. [Reserved]




16.0 References.

 

Same as Section 16.0 of Method 2A, Method 10, and Method 25A.



17.0 Tables, Diagrams, flowcharts, and Validation Data. [Reserved]