of Method 6C, except express all

concentrations as percent, rather than ppm. For O₂ analyzers that use a low-level callbration gas in place of a zero gas, calculate the effluent gas concentration using Equation 3A-1. EC16NO91.116 Where: C₅π=Effluent gas concentration. dry basis, percent. Cm=Actual concentration of the upscale calibration gas, percent. Con=Actual concentration of the low-level calibration gas, percent. Cₘ=Average of initial and final system callbration blas check responses for the upscale calibration gas, percent. Co=Average of initial and final system callbration bias check responses for the low- - level gas, percent. C=Average gas concentration indicated by the gas analyzer, dry basis. percent. 10. Bibliography Same as bibliography of Method 6C. METHOD 3B-GAS ANALYSIS FOR THE DETER- MINATION OF EMISSION RATE CORRECTION FACTOR OR EXCESS AIR 1. APPLICABILITY AND PRINCIPLE 1.1 Applicability 1.1.1 This method is applicable for determining carbon dioxide (CO2), oxygen (O₂). and carbon monoxide (CO) concentrations of a sample from a gas stream of a fossil-fuel combustion provess for excess air or emission rate correction factor calculations. 1.1.2 Other methods. as well as modifications to the procedure described herein, are also applicable for all of the above determinations. Examples of specific methods and modifications include: (1) A multi-point sampling method using an Orsat analyzer to analyze individual grab samples obtained at each point. and (2) a method using CO 2 or O2 and stolchiometric calculations to determine excess air. These methods and modifications may be used, but are subject to the approval of the Administrator, U.S. Environmental Protection Agency (FPA). 1.1.3 Note. Mention of trade names or specific products does not constitute endorsement by EPA. 1.2 Principle. A gas sample is extracted from a stack by one of the following methods: (1) Single-point, grab sampling: (2) single-point. integrated sampling: or (3) multipoint. integrated sampling. The gas sample is analyzed for percent CO₂ percent O₂. and, if necessary. percent CO. An Orsat analyzer must be used for excess air or emission rate correction factor determinations. 2. APPARATUS The alternative sampling systems are the same as those mentioned in Section 2 of Method 3. 2.1 Grab Sampling and Integrated Sampling. Same as in Sections 2.1 and 2.2, respectively. of Method 3. 2.2 Analysis. An Orsat analyzer only. For low CO₂ (less than 4.0 percent) or high O₂ (greater than 15.0 percent) concentrations, the measuring burette of the Orsat must have at least 0.1 percent subdivisions. For Orsat maintenance and operation procedures, follow the instructions recommended by the manufacturer, unless otherwise specified herein. 3. PROCEDURES Each of the three procedures below shall be used only when specified in an applicable subpart of the standards. The use of these procedures for other purposes must have specific prior approval of the Adminsitrator. NOTE .-A Fyrite-type combustion gas analyzer is not acceptable for excess air or emission rate correction factor determinations, unless approved by the Administrator. If both percent CO₂ and percent O₂ are measured, the analytical results of any of the three procedures given below may be used for calculating the dry molecular weight (see Method 3). 3.1 Single-Point. Grab Sampling and Analytical Procedure. 3.1.1 The sampling point in the duct shall be as described in Section 3.1 of Method 3. 3.1.2 Set up the equipment as shown in Figure 3-1 of Method 3, making sure all connections ahead of the analyzer are tight. Leak check the Orsat analyzer according to the procedure described in Section 6 of Method 3. This leak check is mandatory. 3.1.3 Place the probe in the stack, with the tip of the probe positioned at the sampling point; purge the sampling line long enough to allow at least five exchanges. Draw a sample into the analyzer. For emission rate correction factor determinations, immediately analyze the sample, as outlined METHOD 5 40 CFR PART 60 APPENDIX A 2. Devorkin, Howard. et al. Air Pollution Source Testing Manual. Air Pollution Control District, Los Angeles, CA. November, 1963. 3. Methods for Determination of Velocity, Volume. Dust and Mist Content of Gases. Western Precipitation Division of Joy Manufacturing Co., Los Angeles. CA. Bulletin WP- 50. 1968. METHOD 5-DETERMINATION OF PARTICULATE EMISSIONS FROM STATIONARY SOURCES 1. Principle and Applicability 1.1 Principle. Particulate matter is withdrawn isokinetically from the source and collected on a glass fiber filter maintained at a temperature in the range of 120 +14 °C (248±25 °F) or such other temperature as specified by an applicable subpart of the standards or approved by Administrator. U.S. Environmental Protection Agency, for a particular application. The particulate mass, which includes any material that condenses at or above the filtration temperature, is determined gravimetrically after removal of uncombined water. 1.2 Applicability. This method is applicable for the determination of particulate emissions from stationary sources. 2. Apparatus 2.1 Sampling Train. A schematic of the sampling train used in this method is shown in Figure 5-1. Complete construction details are given in APTD-0581 (Citation 2 in Bibliography); commercial models of this train are also available. For changes from APTD- 0581 and for allowable modifications of the train shown in Figure 5-1, see the following subsections. The operating and maintenance procedures for the sampling train are described in APTD-0576 (Citation 3 in Bibliography). Since correct usage is important in obtaining valid results, all users should read APTD-0578 and adopt the operating and maintenance procedures outlined in it, unless otherwise specified herein. The sampling train consists of the following components: EC01JN92.101 2.1.1 Probe Nozzle. Stainless steel (316) or glass with sharp. tapered leading edge. The angle of taper shall be ≤30° and the taper shall be on the outside to preserve a constant internal diameter. The probe nozzle shall be of the button-hook or elbow design. unless otherwise specified by the Administrator. If made of stainless steel, the nozzle 40 CFR Ch. I (7-1-99 Edition) shall be constructed from seamless tubing: other materials of construction may be used, subject to the approval of the Administrator. A range of nozzle sizes suitable for isokinetic sampling should be available, e.g., 0.32 to 1.27 cm (¹/₈ to 1/2 in.)-or larger if higher volume sampling trains are used-inside diameter (ID) nozzles in increments of 0.16 cm (1/16 in.). Each nozzle shall be calibrated according to the procedures outlined In Section 5. 2.1.2 Probe Liner. Borosilicate or quartz glass tubing with a heating system capable of maintaining a gas temperature at the exit end during sampling of 120±14 °C (248±25 °F). or such other temperature as specified by an applicable subpart of the standards or approved by the Administrator for a particular application. (The tester may opt to operate the equipment at a temperature lower than that specified.) Since the actual temperature at the outlet of the probe is not usually monitored during sampling, probes constructed according to APTD-0581 and utilizing the calibration curves of APTD-0576 (or calibrated according to the procedure outlined in APTD-0576) will be considered acceptable. Either borosilicate or quartz glass probe liners may be used for stack temperatures up to about 480 °C (900 °F); quartz liners shall be used for temperatures between 480 and 900 °C (900 and 1,650 °F). Both types of liners may be used at higher temperatures than specified for short periods of time, subject to the approval of the Administrator. The softening temperature for borosilicate is 820 °C (1,508 °F), and for quartz it is 1,500 °C (2.732 °F). Whenever practical, every effort should be made to use borosilicate or quartz glass probe liners. Alternatively, metal liners (e.g., 316 stainless steel, Incoloy 825.2 or other corrosion resistant metals) made of seamless tubing may be used. subject to the approval of the Administrator. 2.1.3 Pitot Tube. Type S, as described in