This method applies to the in-stack measurement of particulate matter (PM) emissions equal to or less than an aerodynamic diameter of nominally 10 µm (PM10) from stationary sources. The EPA recognizes that condensible emissions not collected by an in-stack method are also PM10, and that emissions that contribute to ambient PM10 levels are the sum of condensible emissions and emissions measured by an in-stack PM10 method, such as this method or Method 201A. Therefore, for establishing source contributions to ambient levels of PM10, such as for emission inventory purposes, EPA suggests that source PM10 measurement include both in-stack PM10 and condensible emissions. Condensible emissions may be measured by an impinger analysis in combination with this method.

1.2 Principle.

A gas sample is isokinetically extracted from the source. An in-stack cyclone is used to separate PM greater than PM10, and an in-stack glass fiber filter is used to collect the PM10. To maintain isokinetic flow rate conditions at the tip of the probe and a constant flow rate through the cyclone, a clean, dried portion of the sample gas at stack temperature is recycled into the nozzle. The particulate mass is determined gravimetrically after removal of uncombined water.

2. Apparatus

NOTE: Method 5 as cited in this method refers to the method in 40 CFR Part 60, Appendix A.

2.1 Sampling Train.

A schematic of the exhaust of the exhaust gas recycle (EGR) train is shown in Figure 1.

2.1.1 Nozzle with Recycle Attachment. Stainless steel (316 or equivalent) with a sharp tapered leading edge, and recycle attachment welded directly on the side of the nozzle (see schematic in Figure 2). The angle of the taper shall be on the outside. Use only straight sampling nozzles. "Gooseneck" or other nozzle extensions designed to turn the sample gas flow 90˚, as in Method 5 are not acceptable. Locate a thermocouple in the recycle attachment to measure the temperature of the recycle gas as shown in Figure 3. The recycle attachment shall be made of stainless steel and shall be connected to the probe and nozzle with stainless steel fittings. Two nozzle sizes, e.g., 0.125 and 0.160 in., should be available to allow isokinetic sampling to be conducted over a range of flow rates. Calibrate each nozzle as described in Method 5, Section 5.1.

2.1.2 PM10 Sizer. Cyclone, meeting the specifications in Section 5.7.

2.1.3 Filter Holder. 63-mm, stainless steel. An Andersen filter, part number SE274, has been found to be acceptable for the in-stack filter.

NOTE: Mention of trade names or specific products does not constitute endorsement by the Environmental Protection Agency.

2.1.4 Pitot Tube. Same as in Method 5, Section 2.1.3. Attach the pitot to the pitot lines with stainless steel fittings and to the cyclone in a configuration similar to that shown in Figure 3. The pitot lines shall be made of heat resistant material and attached to the probe with stainless steel fittings.

2.1.5 EGR Probe. Stainless steel, 15.9-mm (5/8-in.) ID tubing with a probe liner, stainless steel 9.53-mm (3/8-in.) ID stainless steel recycle tubing, two 6.35-mm (1/4-in.) ID stainless steel tubing for the pitot tube extensions, three thermocouple leads, and one power lead, all contained by stainless steel tubing with a diameter of approximately 51 mm (2.0 in.). Design considerations should include minimum weight construction materials sufficient for probe structural strength. Wrap the sample and recycle tubes with a heating tape to heat the sample and recycle gases to stack temperature.

2.1.6 Condenser. Same as in Method 5, Section 2.1.7.

2.1.7 Umbilical Connector. Flexible tubing with thermocouple and power leads of sufficient length to connect probe to meter and flow control console.

2.1.8 Vacuum Pump. Leak-tight, oil-less, noncontaminating, with an absolute filter, "HEPA" type, at the pump exit. A Gast Model 0522-V103 G18DX pump has been found to be satisfactory.

2.1.9 Meter and Flow Control Console. System consisting of a dry gas meter and calibrated orifice for measuring sample flow rate and capable of measuring volume to ±2 percent, calibrated laminar flow elements (LFE's) or equivalent for measuring total and sample flow rates, probe heater control, and manometers and magnehelic gauges (as shown in Figures 4 and 5), or equivalent. Temperatures needed for calculations include stack, recycle, probe, dry gas meter, filter, and total flow. Flow measurements include velocity head (•p), orifice differential pressure (•H), total flow, recycle flow, and total back-pressure through the system.

2.1.10 Barometer. Same as in Method 5, Section 2.1.9.

2.1.11 Rubber Tubing. 6.35-mm (1/4-in.) ID flexible rubber tubing.

2.2 Sample Recovery.

2.2.1 Nozzle, Cyclone, and Filter Holder Brushes. Nylon bristle brushes properly sized and shaped for cleaning the nozzle, cyclone, filter holder, and probe or probe liner, with stainless steel wire shafts and handles.

2.2.2 Wash Bottles, Glass Sample Storage Containers, Petri Dishes, Graduated Cylinder and Balance, Plastic Storage Containers, and Funnels. Same as Method 5, Sections 2.2.2 through 2.2.6, and 2.2.8, respectively.

2.3 Analysis.

Same as in Method 5, Section 2.3.

3. Reagents

The reagents used in sampling, sample recovery, and analysis are the same as that specified in Method 5, Sections 3.1, 3.2, and 3.3, respectively.

4. Procedure

4.1 Sampling.

The complexity of this method is such that, in order to obtain reliable results, testers should be trained and experienced with the test procedures.

4.1.1 Pretest Preparation.

Same as in Method 5, Section 4.1.1.

4.1.2 Preliminary Determinations.

Same as in Method 5, Section 4.1.2, except use the directions on nozzle size selection in this section. Use of the EGR method may require a minimum sampling port diameter of 0.2 m (6 in.). Also, the required maximum number of sample traverse points at any location shall be 12.

4.1.2.1 The cyclone and filter holder must be in-stack or at stack temperature during sampling. The blockage effects of the EGR sampling assembly will be minimal if the cross-sectional area of the sampling assembly is 3 percent or less of the cross-sectional area of the duct and a pitot coefficient of 0.84 may be assigned to the pitot. If the cross-sectional area of the assembly is greater than 3 percent of the cross-sectional area of the duct, then either determine the pitot coefficient at sampling conditions or use a standard pitot with a known coefficient in a configuration with the EGR sampling assembly such that flow disturbances are minimized.

4.1.2.2 Construct a setup sheet of pressure drops for various •p's and temperatures. A computer is useful for these calculations. An example of the output of the EGR setup program is shown in Figure 6, and directions on its use are in Section 4.1.5.2. Computer programs, written in IBM BASIC computer language, to do these types of setup and reduction calculations for the EGR procedure, are available through the National Technical Information Services (NTIS), Accession number PB90- 500000, 5285 Port Royal Road, Springfield, Virginia 22161.

4.1.2.3 The EGR setup program allows the tester to select the nozzle size based on anticipated average stack conditions and prints a setup sheet for field use. The amount of recycle through the nozzle should be between 10 and 80 percent. Inputs for the EGR setup program are stack temperature (minimum, maximum, and average), stack velocity (minimum, maximum, and average), atmospheric pressure, stack static pressure, meter box temperature, stack moisture, percent O 2 AND PERCENT CO2 IN THE STACK GAS, PITOT COEFFICIENT (Cp), ORIFICE •H@, FLOW RATE MEASUREMENT CALIBRATION VALUES [SLOPE (M) AND Y-INTERCEPT (B) OF THE CALIBRATION CURVE], AND THE NUMBER OF NOZZLES AVAILABLE AND THEIR DIAMETERS.

4.1.2.4 A LESS RIGOROUS CALCULATION FOR THE SETUP SHEET CAN BE DONE MANUALLY USING THE EQUATIONS ON THE EXAMPLE WORKSHEETS IN FIGURES 7, 8, AND 9, OR BY A HEWLETT-PACKARD HP41 CALCULATOR USING THE PROGRAM PROVIDED IN APPENDIX D OF THE EGR OPERATORS MANUAL, ENTITLED APPLICATIONS GUIDE FOR SOURCE PM10 EXHAUST GAS RECYCLE SAMPLING SYSTEM. THIS CALCULATION USES AN APPROXIMATION OF THE TOTAL FLOW RATE AND AGREES WITHIN 1 PERCENT OF THE EXACT SOLUTION FOR PRESSURE DROPS AT STACK TEMPERATURES FROM 38 TO 260˚C (100 TO 500˚F) AND STACK MOISTURE UP TO 50 PERCENT. ALSO, THE EXAMPLE WORKSHEETS USE A CONSTANT STACK TEMPERATURE IN THE CALCULATIONS, IGNORING THE COMPLICATED TEMPERATURE DEPENDENCE FROM ALL THREE PRESSURE DROP EQUATIONS. ERRORS FOR THIS AT STACK TEMPERATURES ±28˚C (±50˚F) OF THE TEMPERATURE USED IN THE SETUP CALCULATIONS ARE WITHIN 5 PERCENT FOR FLOW RATE AND WITHIN 5 PERCENT FOR CYCLONE CUT SIZE.

4.1.2.5 THE PRESSURE UPSTREAM OF THE LFE'S IS ASSUMED TO BE CONSTANT AT 0.6 IN. HG IN THE EGR SETUP CALCULATIONS.

4.1.2.6 THE SETUP SHEET CONSTRUCTED USING THIS PROCEDURE SHALL BE SIMILAR TO FIGURE 6. INPUTS NEEDED FOR THE CALCULATION ARE THE SAME AS FOR THE SETUP COMPUTER EXCEPT THAT STACK VELOCITIES ARE NOT NEEDED.

4.1.3 PREPARATION OF COLLECTION TRAIN.

SAME AS IN METHOD 5, SECTION 4.1.3, EXCEPT USE THE FOLLOWING DIRECTIONS TO SET UP THE TRAIN.

4.1.3.1 ASSEMBLE THE EGR SAMPLING DEVICE, AND ATTACH IT TO PROBE AS SHOWN IN FIGURE 3. IF STACK TEMPERATURES EXCEED 260˚C (500˚F), THEN ASSEMBLE THE EGR CYCLONE WITHOUT THE O-RING AND REDUCE THE VACUUM REQUIREMENT TO 130 MM HG (5.0 IN. HG) IN THE LEAK-CHECK PROCEDURE IN SECTION 4.1.4.3.2.

4.1.3.2 CONNECT THE PROBE DIRECTLY TO THE FILTER HOLDER AND CONDENSER AS IN METHOD 5. CONNECT THE CONDENSER AND PROBE TO THE METER AND FLOW CONTROL CONSOLE WITH THE UMBILICAL CONNECTOR. PLUG IN THE PUMP AND ATTACH PUMP LINES TO THE METER AND FLOW CONTROL CONSOLE.

4.1.4 LEAK-CHECK PROCEDURE.

THE LEAK-CHECK FOR THE EGR METHOD CONSISTS OF TWO PARTS: THE SAMPLE-SIDE AND THE RECYCLE-SIDE. THE SAMPLE-SIDE LEAK-CHECK IS REQUIRED AT THE BEGINNING OF THE RUN WITH THE CYCLONE ATTACHED, AND AFTER THE RUN WITH THE CYCLONE REMOVED. THE CYCLONE IS REMOVED BEFORE THE POST-TEST LEAK-CHECK TO PREVENT ANY DISTURBANCE OF THE COLLECTED SAMPLE PRIOR TO ANALYSIS. THE RECYCLE-SIDE LEAK-CHECK TESTS THE LEAK TIGHT INTEGRITY OF THE RECYCLE COMPONENTS AND IS REQUIRED PRIOR TO THE FIRST TEST RUN AND AFTER EACH SHIPMENT.

4.1.4.1 PRETEST LEAK-CHECK. A PRETEST LEAK-CHECK OF THE ENTIRE SAMPLE-SIDE, INCLUDING THE CYCLONE AND NOZZLE, IS REQUIRED. USE THE LEAK-CHECK PROCEDURE IN SECTION 4.1.4.3 TO CONDUCT A PRETEST LEAK-CHECK.

4.1.4.2 LEAK-CHECKS DURING SAMPLE RUN. SAME AS IN METHOD 5,

SECTION 4.1.4.1.

4.1.4.3 POST-TEST LEAK-CHECK. A LEAK-CHECK IS REQUIRED AT THE CONCLUSION OF EACH SAMPLING RUN. REMOVE THE CYCLONE BEFORE THE LEAK-CHECK TO PREVENT THE VACUUM CREATED BY THE COOLING OF THE PROBE FROM DISTURBING THE COLLECTED SAMPLE AND USE THE FOLLOWING PROCEDURE TO CONDUCT A POST-TEST LEAK-CHECK.

4.1.4.3.1 THE SAMPLE-SIDE LEAK-CHECK IS PERFORMED AS FOLLOWS: AFTER REMOVING THE CYCLONE, SEAL THE PROBE WITH A LEAK-TIGHT STOPPER. BEFORE STARTING PUMP, CLOSE THE COARSE TOTAL VALVE AND BOTH RECYCLE VALVES, AND OPEN COMPLETELY THE SAMPLE BACK PRESSURE VALVE AND THE FINE TOTAL VALVE. AFTER TURNING THE PUMP ON, PARTIALLY OPEN THE COARSE TOTAL VALVE SLOWLY TO PREVENT A SURGE IN THE MANOMETER. ADJUST THE VACUUM TO AT LEAST 381 MM HG (15.0 IN. HG) WITH THE FINE TOTAL VALVE. IF THE DESIRED VACUUM IS EXCEEDED, EITHER LEAK-CHECK AT THIS HIGHER VACUUM OR END THE LEAK-CHECK AS SHOWN BELOW AND START OVER. CAUTION: DO NOT DECREASE THE VACUUM WITH ANY OF THE VALVES. THIS MAY CAUSE A RUPTURE OF THE FILTER. NOTE: A LOWER VACUUM MAY BE USED, PROVIDED THAT IT IS NOT EXCEEDED DURING THE TEST.

4.1.4.3.2 LEAK RATES IN EXCESS OF 0.00057 M³/MIN (0.020 FT³/MIN) ARE UNACCEPTABLE. IF THE LEAK RATE IS TOO HIGH, VOID THE SAMPLING RUN.

4.1.4.3.3 TO COMPLETE THE LEAK-CHECK, SLOWLY REMOVE THE STOPPER FROM THE NOZZLE UNTIL THE VACUUM IS NEAR ZERO, THEN IMMEDIATELY TURN OFF THE PUMP. THIS PROCEDURE SEQUENCE PREVENTS A PRESSURE SURGE IN THE MANOMETER FLUID AND RUPTURE OF THE FILTER.

4.1.4.3.4 THE RECYCLE-SIDE LEAK-CHECK IS PERFORMED AS FOLLOWS: CLOSE THE COARSE AND FINE TOTAL VALVES AND SAMPLE BACK PRESSURE VALVE. PLUG THE SAMPLE INLET AT THE METER BOX. TURN ON THE POWER AND THE PUMP, CLOSE THE RECYCLE VALVES, AND OPEN THE TOTAL FLOW VALVES. ADJUST THE TOTAL FLOW FINE ADJUST VALVE UNTIL A VACUUM OF 25 INCHES OF MERCURY IS ACHIEVED. IF THE DESIRED VACUUM IS EXCEEDED, EITHER LEAK-CHECK AT THIS HIGHER VACUUM, OR END THE LEAK-CHECK AND START OVER. MINIMUM ACCEPTABLE LEAK RATES ARE THE SAME AS FOR THE SAMPLE-SIDE. IF THE LEAK RATE IS TOO HIGH, VOID THE SAMPLING RUN.

4.1.5 EGR TRAIN OPERATION.

SAME AS IN METHOD 5, SECTION 4.1.5, EXCEPT OMIT REFERENCES TO NOMOGRAPHS AND RECOMMENDATIONS ABOUT CHANGING THE FILTER ASSEMBLY DURING A RUN.

4.1.5.1 RECORD THE DATA REQUIRED ON A DATA SHEET SUCH AS THE ONE SHOWN IN FIGURE 10. MAKE PERIODIC CHECKS OF THE MANOMETER LEVEL AND ZERO TO ENSURE CORRECT •H AND •P VALUES. AN ACCEPTABLE PROCEDURE FOR CHECKING THE ZERO IS TO EQUALIZE THE PRESSURE AT BOTH ENDS OF THE MANOMETER BY PULLING OFF THE TUBING, ALLOWING THE FLUID TO EQUILIBRATE AND, IF NECESSARY, TO RE-ZERO. MAINTAIN THE PROBE TEMPERATURE TO WITHIN 11˚C (20˚F) OF STACK TEMPERATURE.

4.1.5.2 THE PROCEDURE FOR USING THE EXAMPLE EGR SETUP SHEET IS AS FOLLOWS: OBTAIN A STACK VELOCITY READING FROM THE PITOT MANOMETER (•P), AND FIND THIS VALUE ON THE ORDINATE AXIS OF THE SETUP SHEET. FIND THE STACK TEMPERATURE ON THE ABSCISSA. WHERE THESE TWO VALUES INTERSECT ARE THE DIFFERENTIAL PRESSURES NECESSARY TO ACHIEVE ISOKINETICITY AND 10 •M CUT SIZE (INTERPOLATION MAY BE NECESSARY).

4.1.5.3 THE TOP THREE NUMBERS ARE DIFFERENTIAL PRESSURES (IN. H2O), AND THE BOTTOM NUMBER IS THE PERCENT RECYCLE AT THESE FLOW SETTINGS. ADJUST THE TOTAL FLOW RATE VALVES, COARSE AND FINE, TO THE SAMPLE VALUE (•H) ON THE SETUP SHEET, AND THE RECYCLE FLOW RATE VALVES, COARSE AND FINE, TO THE RECYCLE FLOW ON THE SETUP SHEET.

4.1.5.4 FOR STARTUP OF THE EGR SAMPLE TRAIN, THE FOLLOWING PROCEDURE IS RECOMMENDED. PREHEAT THE CYCLONE IN THE STACK FOR 30 MINUTES. CLOSE BOTH THE SAMPLE AND RECYCLE COARSE VALVES. OPEN THE FINE TOTAL, FINE RECYCLE, AND SAMPLE BACK PRESSURE VALVES HALFWAY. ENSURE THAT THE NOZZLE IS PROPERLY ALIGNED WITH THE SAMPLE STREAM. AFTER NOTING THE •P AND STACK TEMPERATURE, SELECT THE APPROPRIATE •H AND RECYCLE FROM THE EGR SETUP SHEET. START THE PUMP AND TIMING DEVICE SIMULTANEOUSLY. IMMEDIATELY OPEN BOTH THE COARSE TOTAL AND THE COARSE RECYCLE VALVES SLOWLY TO OBTAIN THE APPROXIMATE DESIRED VALUES. ADJUST BOTH THE FINE TOTAL AND THE FINE RECYCLE VALVES TO ACHIEVE MORE PRECISELY THE DESIRED VALUES. IN THE EGR FLOW SYSTEM, ADJUSTMENT OF EITHER VALVE WILL RESULT IN A CHANGE IN BOTH TOTAL AND RECYCLE FLOW RATES, AND A SLIGHT ITERATION BETWEEN THE TOTAL AND RECYCLE VALVES MAY BE NECESSARY. BECAUSE THE SAMPLE BACK PRESSURE VALVE CONTROLS THE TOTAL FLOW RATE THROUGH THE SYSTEM, IT MAY BE NECESSARY TO ADJUST THIS VALVE IN ORDER TO OBTAIN THE CORRECT FLOW RATE.

NOTE: ISOKINETIC SAMPLING AND PROPER OPERATION OF THE CYCLONE ARE NOT ACHIEVED UNLESS THE CORRECT •H AND RECYCLE FLOW RATES ARE MAINTAINED.

4.1.5.5 DURING THE TEST RUN, MONITOR THE PROBE AND FILTER TEMPERATURES PERIODICALLY, AND MAKE ADJUSTMENTS AS NECESSARY TO MAINTAIN THE DESIRED TEMPERATURES. IF THE SAMPLE LOADING IS HIGH, THE FILTER MAY BEGIN TO BLIND OR THE CYCLONE MAY CLOG. THE FILTER OR THE CYCLONE MAY BE REPLACED DURING THE SAMPLE RUN. BEFORE CHANGING THE FILTER OR CYCLONE, CONDUCT A LEAK-CHECK (SECTION 4.1.4.2). THE TOTAL PARTICULATE MASS SHALL BE THE SUM OF ALL CYCLONE AND THE FILTER CATCH DURING THE RUN. MONITOR STACK TEMPERATURE AND •P PERIODICALLY, AND MAKE THE NECESSARY ADJUSTMENTS IN SAMPLING AND RECYCLE FLOW RATES TO MAINTAIN ISOKINETIC SAMPLING AND THE PROPER FLOW RATE THROUGH THE CYCLONE. AT THE END OF THE RUN, TURN OFF THE PUMP, CLOSE THE COARSE TOTAL VALVE, AND RECORD THE FINAL DRY GAS METER READING. REMOVE THE PROBE FROM THE STACK, AND CONDUCT A POST-TEST LEAK-CHECK AS OUTLINED IN SECTION 4.1.4.3.

4.1.6 CALCULATION OF PERCENT ISOKINETIC RATE AND AERODYNAMIC CUT SIZE.

CALCULATE PERCENT ISOKINETIC RATE AND THE AERODYNAMIC CUT SIZE (D50) (SEE CALCULATIONS, SECTION 6) TO DETERMINE WHETHER THE TEST WAS VALID OR ANOTHER TEST RUN SHOULD BE MADE. IF THERE WAS DIFFICULTLY IN MAINTAINING ISOKINETIC RATES OR A D50 OF 10 •M BECAUSE OF SOURCE CONDITIONS, THE ADMINISTRATOR MAY BE CONSULTED FOR POSSIBLE VARIANCE.

4.2 SAMPLE RECOVERY.

ALLOW THE PROBE TO COOL. WHEN THE PROBE CAN BE SAFELY HANDLED, WIPE OFF ALL EXTERNAL PM ADHERING TO THE OUTSIDE OF THE NOZZLE, CYCLONE, AND NOZZLE ATTACHMENT, AND PLACE A CAP OVER THE NOZZLE TO PREVENT LOSING OR GAINING PM. DO NOT CAP THE NOZZLE TIP TIGHTLY WHILE THE SAMPLING TRAIN IS COOLING, AS THIS ACTION WOULD CREATE A VACUUM IN THE FILTER HOLDER. DISCONNECT THE PROBE FROM THE UMBILICAL CONNECTOR, AND TAKE THE PROBE TO THE CLEANUP SITE. SAMPLE RECOVERY SHOULD BE CONDUCTED IN A DRY INDOOR AREA OR, IF OUTSIDE, IN AN AREA PROTECTED FROM WIND AND FREE OF DUST. CAP THE ENDS OF THE IMPINGERS AND CARRY THEM TO THE CLEANUP SITE. INSPECT THE COMPONENTS OF THE TRAIN PRIOR TO AND DURING DISASSEMBLY TO NOTE ANY ABNORMAL CONDITIONS. DISCONNECT THE PITOT FROM THE CYCLONE. REMOVE THE CYCLONE FROM THE PROBE. RECOVER THE SAMPLE AS FOLLOWS:

4.2.1 CONTAINER NUMBER 1 (FILTER). THE RECOVERY SHALL BE THE SAME AS THAT FOR CONTAINER NUMBER 1 IN METHOD 5, SECTION 4.2.

4.2.2 CONTAINER NUMBER 2 (CYCLONE OR LARGE PM CATCH). THE CYCLONE MUST BE DISASSEMBLED AND THE NOZZLE REMOVED IN ORDER TO RECOVER THE LARGE PM CATCH. QUANTITATIVELY RECOVER THE PM FROM THE INTERIOR SURFACES OF THE NOZZLE AND THE CYCLONE, EXCLUDING THE "TURN AROUND" CUP AND THE INTERIOR SURFACES OF THE EXIT TUBE. THE RECOVERY SHALL BE THE SAME AS THAT FOR CONTAINER NUMBER 2 IN METHOD 5, SECTION 4.2.

4.2.3 CONTAINER NUMBER 3 (PM10) QUANTITATIVELY 10 UANTITATIVELY RECOVER THE PM FROM ALL OF THE SURFACES FROM CYCLONE EXIT TO THE FRONT HALF OF THE IN-STACK FILTER HOLDER, INCLUDING THE "TURN AROUND" CUP AND THE INTERIOR OF THE EXIT TUBE. THE RECOVERY SHALL BE THE SAME AS THAT FOR CONTAINER NUMBER 2 IN METHOD 5, SECTION 4.2.

4.2.4 CONTAINER NUMBER 4 (SILICA GEL). SAME AS THAT FOR CONTAINER NUMBER 3 IN METHOD 5, SECTION 4.2.

4.2.5 IMPINGER WATER. SAME AS IN METHOD 5, SECTION 4.2, UNDER "IMPINGER WATER."

4.3 ANALYSIS.

SAME AS IN METHOD 5, SECTION 4.3, EXCEPT HANDLE EGR CONTAINER NUMBERS 1 AND 2 LIKE CONTAINER NUMBER 1 IN METHOD 5, EGR CONTAINER NUMBERS 3, 4, AND 5 LIKE CONTAINER NUMBER 3 IN METHOD 5, AND EGR CONTAINER NUMBER 6 LIKE CONTAINER NUMBER 3 IN METHOD 5. USE FIGURE 11 TO RECORD THE WEIGHTS OF PM COLLECTED.

4.4 QUALITY CONTROL PROCEDURES.

SAME AS IN METHOD 5, SECTION 4.4.

5. CALIBRATION

MAINTAIN AN ACCURATE LABORATORY LOG OF ALL CALIBRATIONS.

5.1 PROBE NOZZLE.

SAME AS IN METHOD 5, SECTION 5.1.

5.2 PITOT TUBE.

SAME AS IN METHOD 5, SECTION 5.2.

5.3 METER AND FLOW CONTROL CONSOLE.

5.3.1 DRY GAS METER. SAME AS IN METHOD 5, SECTION 5.3.

5.3.2 LFE GAUGES. CALIBRATE THE RECYCLE, TOTAL, AND INLET TOTAL LFE GAUGES WITH A MANOMETER. READ AND RECORD FLOW RATES AT 10, 50, AND 90 PERCENT OF FULL SCALE ON THE TOTAL AND RECYCLE PRESSURE GAUGES. READ AND RECORD FLOW RATES AT 10, 20, AND 30 PERCENT OF FULL SCALE ON THE INLET TOTAL LFE PRESSURE GAUGE. RECORD THE TOTAL AND RECYCLE READINGS TO THE NEAREST 0.3 MM (0.01 IN.). RECORD THE INLET TOTAL LFE READINGS TO THE NEAREST 3 MM (0.1 IN.). MAKE THREE SEPARATE MEASUREMENTS AT EACH SETTING AND CALCULATE THE AVERAGE. THE MAXIMUM DIFFERENCE BETWEEN THE AVERAGE PRESSURE READING AND THE AVERAGE MANOMETER READING SHALL NOT EXCEED 1 MM (0.05 IN.). IF THE DIFFERENCES EXCEED THE LIMIT SPECIFIED, ADJUST OR REPLACE THE PRESSURE GAUGE. AFTER EACH FIELD USE, CHECK THE CALIBRATION OF THE PRESSURE GAUGES.

5.3.3 TOTAL LFE. SAME AS THE METERING SYSTEM IN METHOD 5, SECTION 5.3.

5.3.4 RECYCLE LFE. SAME AS THE METERING SYSTEM IN METHOD 5, SECTION 5.3, EXCEPT COMPLETELY CLOSE BOTH THE COARSE AND FINE RECYCLE VALVES.

5.4 PROBE HEATER.

CONNECT THE PROBE TO THE METER AND FLOW CONTROL CONSOLE WITH THE UMBILICAL CONNECTOR. INSERT A THERMOCOUPLE INTO THE PROBE SAMPLE LINE APPROXIMATELY HALF THE LENGTH OF THE PROBE SAMPLE LINE. CALIBRATE THE PROBE HEATER AT 66˚C (150˚F), 121˚C (250˚F), AND 177˚C (350˚F). TURN ON THE POWER, AND SET THE PROBE HEATER TO THE SPECIFIED TEMPERATURE. ALLOW THE HEATER TO EQUILIBRATE, AND RECORD THE THERMOCOUPLE TEMPERATURE AND THE METER AND FLOW CONTROL CONSOLE TEMPERATURE TO THE NEAREST 0.5˚C (1˚F). THE TWO TEMPERATURES SHOULD AGREE WITHIN 5.5˚C (10˚F). IF THIS AGREEMENT IS NOT MET, ADJUST OR REPLACE THE PROBE HEATER CONTROLLER.

5.5 TEMPERATURE GAUGES.

CONNECT ALL THERMOCOUPLES, AND LET THE METER AND FLOW CONTROL CONSOLE EQUILIBRATE TO AMBIENT TEMPERATURE. ALL THERMOCOUPLES SHALL AGREE TO WITHIN 1.1˚C (2.0˚F) WITH A STANDARD MERCURY-IN-GLASS THERMOMETER. REPLACE DEFECTIVE THERMOCOUPLES.

5.6 BAROMETER.

CALIBRATE AGAINST A STANDARD MERCURY-IN-GLASS BAROMETER.

5.7 PROBE CYCLONE AND NOZZLE COMBINATIONS.

THE PROBE CYCLONE AND NOZZLE COMBINATIONS NEED NOT BE CALIBRATED IF THE CYCLONE MEETS THE DESIGN SPECIFICATIONS IN FIGURE 12 AND THE NOZZLE MEETS THE DESIGN SPECIFICATIONS IN APPENDIX B OF THE APPLICATION GUIDE FOR THE SOURCE PM EXHAUST GAS RECYCLE SAMPLING SYSTEM10, EPA/600/3-88-058. THIS DOCUMENT MAY BE OBTAINED FROM ROY HUNTLEY AT (919)541-1060. IF THE NOZZLES DO NOT MEET THE DESIGN SPECIFICATIONS, THEN TEST THE CYCLONE AND NOZZLE COMBINATION FOR CONFORMITY WITH THE PERFORMANCE SPECIFICATIONS (PS'S) IN TABLE 1. THE PURPOSE OF THE PS TESTS IS TO DETERMINE IF THE CYCLONE'S SHARPNESS OF CUT MEETS MINIMUM PERFORMANCE CRITERIA. IF THE CYCLONE DOES NOT MEET DESIGN SPECIFICATIONS, THEN, IN ADDITION TO THE CYCLONE AND NOZZLE COMBINATION CONFORMING TO THE PS'S, CALIBRATE THE CYCLONE AND DETERMINE THE RELATIONSHIP BETWEEN FLOW RATE, GAS VISCOSITY, AND GAS DENSITY. USE THE PROCEDURES IN SECTION 5.7.5 TO CONDUCT PS TESTS AND THE PROCEDURES IN SECTION 5.8 TO CALIBRATE THE CYCLONE. CONDUCT THE PS TESTS IN A WIND TUNNEL DESCRIBED IN SECTION 5.7.1 AND USING A PARTICLE GENERATION SYSTEM DESCRIBED IN SECTION 5.7.2. USE FIVE PARTICLE SIZES AND THREE WIND VELOCITIES AS LISTED IN TABLE 2. PERFORM A MINIMUM OF THREE REPLICATE MEASUREMENTS OF COLLECTION EFFICIENCY FOR EACH OF THE 15 CONDITIONS LISTED, FOR A MINIMUM OF 45 MEASUREMENTS.

5.7.1 WIND TUNNEL. PERFORM CALIBRATION AND PS TESTS IN A WIND TUNNEL (OR EQUIVALENT TEST APPARATUS) CAPABLE OF ESTABLISHING AND MAINTAINING THE REQUIRED GAS STREAM VELOCITIES WITHIN 10 PERCENT.

5.7.2 PARTICLE GENERATION SYSTEM. THE PARTICLE GENERATION SYSTEM SHALL BE CAPABLE OF PRODUCING SOLID MONODISPERSED DYE PARTICLES WITH THE MASS MEDIAN AERODYNAMIC DIAMETERS SPECIFIED IN TABLE 2. THE PARTICLE SIZE DISTRIBUTION VERIFICATION SHOULD BE PERFORMED ON AN INTEGRATED SAMPLE OBTAINED DURING THE SAMPLING PERIOD OF EACH TEST. AN ACCEPTABLE ALTERNATIVE IS TO VERIFY THE SIZE DISTRIBUTION OF SAMPLES OBTAINED BEFORE AND AFTER EACH TEST, WITH BOTH SAMPLES REQUIRED TO MEET THE DIAMETER AND MONODISPERSITY REQUIREMENTS FOR AN ACCEPTABLE TEST RUN.

5.7.2.1 ESTABLISH THE SIZE OF THE SOLID DYE PARTICLES DELIVERED TO THE TEST SECTION OF THE WIND TUNNEL USING THE OPERATING PARAMETERS OF THE PARTICLE GENERATION SYSTEM, AND VERIFY THE SIZE DURING THE TESTS BY MICROSCOPIC EXAMINATION OF SAMPLES OF THE PARTICLES COLLECTED ON A MEMBRANE FILTER. THE PARTICLE SIZE, AS ESTABLISHED BY THE OPERATING PARAMETERS OF THE GENERATION SYSTEM, SHALL BE WITHIN THE TOLERANCE SPECIFIED IN TABLE 2. THE PRECISION OF THE PARTICLE SIZE VERIFICATION TECHNIQUE SHALL BE AT LEAST ±0.5 •M, AND THE PARTICLE SIZE DETERMINED BY THE VERIFICATION TECHNIQUE SHALL NOT DIFFER BY MORE THAN 10 PERCENT FROM THAT ESTABLISHED BY THE OPERATING PARAMETERS OF THE PARTICLE GENERATION SYSTEM.

5.7.2.2 CERTIFY THE MONODISPERSITY OF THE PARTICLES FOR EACH TEST EITHER BY MICROSCOPIC INSPECTION OF COLLECTED PARTICLES ON FILTERS OR BY OTHER SUITABLE MONITORING TECHNIQUES SUCH AS AN OPTICAL PARTICLE COUNTER FOLLOWED BY A MULTICHANNEL PULSE HEIGHT ANALYZER. IF THE PROPORTION OF MULTIPLETS AND SATELLITES IN AN AEROSOL EXCEEDS 10 PERCENT BY MASS, THE PARTICLE GENERATION SYSTEM IS UNACCEPTABLE FOR PURPOSES OF THIS TEST. MULTIPLETS ARE PARTICLES THAT ARE AGGLOMERATED, AND SATELLITES ARE PARTICLES THAT ARE SMALLER THAN THE SPECIFIED SIZE RANGE.

5.7.3 SCHEMATIC DRAWINGS. SCHEMATIC DRAWINGS OF THE WIND TUNNEL AND BLOWER SYSTEM AND OTHER INFORMATION SHOWING COMPLETE PROCEDURAL DETAILS OF THE TEST ATMOSPHERE GENERATION, VERIFICATION, AND DELIVERY TECHNIQUES SHALL BE FURNISHED WITH CALIBRATION DATA TO THE REVIEWING AGENCY.

5.7.4 FLOW RATE MEASUREMENT. DETERMINE THE CYCLONE FLOW RATES WITH A DRY GAS METER AND A STOPWATCH, OR A CALIBRATED ORIFICE SYSTEM CAPABLE OF MEASURING FLOW RATES TO WITHIN 2 PERCENT.

5.7.5 PERFORMANCE SPECIFICATION PROCEDURE. ESTABLISH THE TEST PARTICLE GENERATOR OPERATION AND VERIFY THE PARTICLE SIZE MICROSCOPICALLY. IF MONODISPERSITY IS TO BE VERIFIED BY MEASUREMENTS AT THE BEGINNING AND THE END OF THE RUN RATHER THAN BY AN INTEGRATED SAMPLE, THESE MEASUREMENTS MAY BE MADE AT THIS TIME.

5.7.5.1 THE CYCLONE CUT SIZE (D50) IS DEFINED AS THE AERODYNAMIC DIAMETER OF A PARTICLE HAVING A 50 PERCENT PROBABILITY OF PENETRATION. DETERMINE THE REQUIRED CYCLONE FLOW RATE AT WHICH D50 IS 10 •M. A SUGGESTED PROCEDURE IS TO VARY THE CYCLONE FLOW RATE WHILE KEEPING A CONSTANT PARTICLE SIZE OF 10 •M. MEASURE THE PM COLLECTED IN THE CYCLONE (MC ), EXIT TUBE (MT ), AND FILTER (MF). COMPUTE THE CYCLONE EFFICIENCY (EC) AS FOLLOWS:

5.7.5.2 PERFORM THREE REPLICATES AND CALCULATE THE AVERAGE CYCLONE EFFICIENCY AS FOLLOW:

WHERE E1, E2, AND E3 ARE REPLICATE MEASUREMENTS OF EC.

5.7.5.3 CALCULATE THE STANDARD DEVIATION (•) FOR THE REPLICATE MEASUREMENTS OF EC AS FOLLOWS:

IF • EXCEEDS 0.10, REPEAT THE REPLICATE RUNS.

5.7.5.4 USING THE CYCLONE FLOW RATE THAT PRODUCES D50 FOR 10 •M, MEASURE THE OVERALL EFFICIENCY OF THE CYCLONE AND NOZZLE, EO, AT THE PARTICLE SIZES AND NOMINAL GAS VELOCITIES IN TABLE 2 USING THE FOLLOWING PROCEDURE.

5.7.5.5 SET THE AIR VELOCITY IN THE WIND TUNNEL TO ONE OF THE NOMINAL GAS VELOCITIES FROM TABLE 2. ESTABLISH ISOKINETIC SAMPLING CONDITIONS AND THE CORRECT FLOW RATE THROUGH THE SAMPLER (CYCLONE AND NOZZLE) USING RECYCLE CAPACITY SO THAT THE D50 IS 10 •M. SAMPLE LONG ENOUGH TO OBTAIN ±5 PERCENT PRECISION ON THE TOTAL COLLECTED MASS AS DETERMINED BY THE PRECISION AND THE SENSITIVITY OF THE MEASURING TECHNIQUE. DETERMINE SEPARATELY THE NOZZLE CATCH (MN), CYCLONE CATCH (MC), CYCLONE EXIT TUBE CATCH (MT), AND COLLECTION FILTER CATCH (MF).

5.7.5.6 CALCULATE THE OVERALL EFFICIENCY (EO) AS FOLLOWS:

5.7.5.7 DO THREE REPLICATES FOR EACH COMBINATION OF GAS VELOCITIES AND PARTICLE SIZES IN TABLE 2. CALCULATE EO FOR EACH PARTICLE SIZE FOLLOWING THE PROCEDURES DESCRIBED IN THIS SECTION FOR DETERMINING EFFICIENCY. CALCULATE THE STANDARD DEVIATION (•) FOR THE REPLICATE MEASUREMENTS. IF • EXCEEDS 0.10, REPEAT THE REPLICATE RUNS.

5.7.6 CRITERIA FOR ACCEPTANCE. FOR EACH OF THE THREE GAS STREAM VELOCITIES, PLOT THE AVERAGE EO AS A FUNCTION OF PARTICLE SIZE ON FIGURE 13. DRAW A SMOOTH CURVE FOR EACH VELOCITY THROUGH ALL PARTICLE SIZES. THE CURVE SHALL BE WITHIN THE BANDED REGION FOR ALL SIZES, AND THE AVERAGE EC FOR A D50 FOR 10 •M SHALL BE 50 ± 0.5 PERCENT.

5.8 CYCLONE CALIBRATION PROCEDURE.

THE PURPOSE OF THIS SECTION IS TO DEVELOP THE RELATIONSHIP BETWEEN FLOW RATE, GAS VISCOSITY, GAS DENSITY, AND D50. THIS PROCEDURE ONLY NEEDS TO BE DONE ON THOSE CYCLONES THAT DO NOT MEET THE DESIGN SPECIFICATIONS IN FIGURE 12.

5.8.1 CALCULATE CYCLONE FLOW RATE. DETERMINE THE FLOW RATES AND D50'S FOR THREE DIFFERENT PARTICLE SIZES BETWEEN 5 •M AND 15 •M, ONE OF WHICH SHALL BE 10 •M. ALL SIZES MUST BE WITHIN 0.5 •M. FOR EACH SIZE, USE A DIFFERENT TEMPERATURE WITHIN 60˚C (108˚F) OF THE TEMPERATURE AT WHICH THE CYCLONE IS TO BE USED AND CONDUCT TRIPLICATE RUNS. A SUGGESTED PROCEDURE IS TO KEEP THE PARTICLE SIZE CONSTANT AND VARY THE FLOW RATE. SOME OF THE VALUES OBTAINED IN THE PS TESTS IN SECTION 5.7.5 MAY BE USED.

5.8.1.1 ON LOG-LOG GRAPH PAPER, PLOT THE REYNOLDS NUMBER (RE) ON THE ABSCISSA, AND THE SQUARE ROOT OF THE STOKES 50 NUMBER [(STK50)1/2] ON THE ORDINATE FOR EACH TEMPERATURE. USE THE FOLLOWING EQUATIONS:

WHERE:

5.8.1.2 USE A LINEAR REGRESSION ANALYSIS TO DETERMINE THE SLOPE (M), AND THE Y-INTERCEPT (B). USE THE FOLLOWING FORMULA TO DETERMINE Q, THE CYCLONE FLOW RATE REQUIRED FOR A CUT SIZE OF 10 •M.

WHERE:

5.8.2 DIRECTIONS FOR USING Q. REFER TO SECTION 5 OF THE EGR OPERATORS MANUAL FOR DIRECTIONS IN USING THIS EXPRESSION FOR Q IN THE SETUP CALCULATIONS.

6. CALCULATIONS

6.1 THE EGR DATA REDUCTION CALCULATIONS ARE PERFORMED BY THE EGR REDUCTION COMPUTER PROGRAM, WHICH IS WRITTEN IN IBM BASIC COMPUTER LANGUAGE AND IS AVAILABLE THROUGH NTIS, ACCESSION NUMBER PB90-500000, 5285 PORT ROYAL ROAD, SPRINGFIELD, VIRGINIA 22161. EXAMPLES OF PROGRAM INPUTS AND OUTPUTS ARE SHOWN IN FIGURE 14.

6.1.1 CALCULATIONS CAN ALSO BE DONE MANUALLY, AS SPECIFIED IN METHOD 5, SECTIONS 6.3 THROUGH 6.7, AND 6.9 THROUGH 6.12, WITH THE ADDITION OF THE FOLLOWING:

6.1.2 NOMENCLATURE.

6.2 PM10 PARTICULATE WEIGHT. DETERMINE THE WEIGHT OF PM10 BY SUMMING THE WEIGHTS OBTAINED FROM CONTAINER NUMBERS 1 AND 3, LESS THE ACETONE BLANK.

6.3 TOTAL PARTICULATE WEIGHT. DETERMINE THE PARTICULATE CATCH FOR PM GREATER THAN PM10 FROM THE WEIGHT OBTAINED FROM CONTAINER NUMBER 2 LESS THE ACETONE BLANK, AND ADD IT TO THE PM10 PARTICULATE WEIGHT.

6.4 PM10 FRACTION. DETERMINE THE PM10 FRACTION OF THE TOTAL PARTICULATE WEIGHT BY DIVIDING THE PM10 PARTICULATE WEIGHT BY THE TOTAL PARTICULATE WEIGHT.

6.5 TOTAL CYCLONE FLOW RATE. THE AVERAGE FLOW RATE AT STANDARD CONDITIONS IS DETERMINED FROM THE AVERAGE PRESSURE DROP ACROSS THE TOTAL LFE AND IS CALCULATED AS FOLLOWS:

THE FLOW RATE, AT ACTUAL CYCLONE CONDITIONS, IS CALCULATED AS FOLLOWS:

6.6 AERODYNAMIC CUT SIZE. USE THE FOLLOWING PROCEDURE TO DETERMINE THE AERODYNAMIC CUT SIZE (D50).

6.6.1 DETERMINE THE WATER FRACTION OF THE MIXED GAS THROUGH THE CYCLONE BY USING THE EQUATION BELOW.

6.6.2 CALCULATE THE CYCLONE GAS VISCOSITY AS FOLLOWS:

6.6.3 CALCULATE THE MOLECULAR WEIGHT ON A WET BASIS OF THE CYCLONE GAS AS FOLLOWS:

6.6.4 IF THE CYCLONE MEETS THE DESIGN SPECIFICATION IN FIGURE 12, CALCULATE THE ACTUAL D50 OF THE CYCLONE FOR THE RUN AS FOLLOWS:

6.6.5 IF THE CYCLONE DOES NOT MEET THE DESIGN SPECIFICATIONS IN FIGURE 12, THEN USE THE FOLLOWING EQUATION TO CALCULATE D50.

WHERE:

M = SLOPE OF THE CALIBRATION CURVE OBTAINED IN SECTION 5.8.2.

B = Y-INTERCEPT OF THE CALIBRATION CURVE OBTAINED IN SECTION 5.8.2.

6.7 ACCEPTABLE RESULTS. ACCEPTABILITY OF ANISOKINETIC VARIATION IS THE SAME AS METHOD 5, SECTION 6.12.

6.7.1 IF 9.0 •M ≤ D50 ≤11 •M AND 90 ≤ I ≤ 110, THE RESULTS ARE ACCEPTABLE. IF D50 IS GREATER THAN 11 •M, THE ADMINISTRATOR MAY ACCEPT THE RESULTS. IF D50 IS LESS THAN 9.0 •M, REJECT THE RESULTS AND REPEAT THE TEST.

7. BIBLIOGRAPHY

1. SAME AS BIBLIOGRAPHY IN METHOD 5.

2. MCCAIN, J.D., J.W. RAGLAND, AND A.D. WILLIAMSON. RECOMMENDED METHODOLOGY FOR THE DETERMINATION OF PARTICLES SIZE DISTRIBUTIONS IN DUCTED SOURCES, FINAL REPORT. PREPARED FOR THE CALIFORNIA AIR RESOURCES BOARD BY SOUTHERN RESEARCH INSTITUTE. MAY 1986.

3. FARTHING, W.E., S.S. DAWES, A.D. WILLIAMSON, J.D. MCCAIN, R.S. MARTIN, AND J.W. RAGLAND. DEVELOPMENT OF SAMPLING METHODS FOR SOURCE PM-10 EMISSIONS. SOUTHERN RESEARCH INSTITUTE FOR THE ENVIRONMENTAL PROTECTION AGENCY. APRIL 1989.

4. APPLICATION GUIDE FOR THE SOURCE PM10 EXHAUST GAS RECYCLE SAMPLING SYSTEM, EPA/600/3-88-058.