3, provided that it is calibrated Initially and recalibrated periodically as follows:

7.1.1 Standard Dry Gas Meter Calibration. 7.1.1.1 The dry gas meter to be calibrated and used as a secondary reference meter should be of high quality and have an appropriately sized capacity, e.g., 3 liters/rev (0.1 ft ³/rev). A spirometer (400 liters or more capacity). or equivalent, may be used for this callbration, although a wet test meter is usually more practical. The wet test meter should have a capacity of 30 liters/rev (1 ft 3/rev) and capable of measuring volume to within +1.0 percent: wet test meters should be checked against a spirometer or a liquid displacement meter to ensure the accuracy of the wet test meter. Spirometers or wet test meters of other sizes may be used, provided that the specified accuracies of the procedure are maintained. 7.1.1.2 Set up the components as shown in Figure 5.7. A spirometer. or equivalent, may Pt. 60, App. A, Meth. 5 be used in place of the wet test meter in the system. Run the pump for at least 5 minutes at a flow rate of about 10 liters/min (0.35 cfm) to condition the interior surface of the wet test meter. The pressure drop indicated by the manometer at the inlet side of the dry 40 CFR Ch. I (7-1-99 Edition) gas meter should be minimized [no greater than 100 mm H₂O (4 In. H₂O) at a flow rate of 30 liters/min (1-cfm)]. This can be accomplished by using large diameter tubing connections and straight pipe fittings. EC01JN92.109 7.1.1.3 Collect the data as shown in the example data sheet (see Figure 5-8). Make triplicate runs at each of the flow rates and at no less than five different flow rates. The range of flow rates should be between 10 and 34 liters/min (0.35 and 1.2 cfm) or over the expected operating range. EC01JN92.110 7.1.1.4 Calculate flow rate, Q. for each run using the wet test meter gas volume, Vw and the run time. 8. Calculate the dry gas meter coefficient. Yds. for each run. These calculations are as follows: Pt. 60, App. A, Meth. 5 40 CFR Ch. I (7-1-99 Edition) EC15NO91.130 Where: K1=0.3858 for International system of units (SI); 17.64 for English units. Vw=Wet test meter volume, liters (ft 3). Vds=Dry gas meter volume. liters (ft 3). tds=Average dry gas meter temperature, . C (°F). tstd=273° C for SI units; 460° F for English units. tw=Average wet test meter temperature, o C (°F). Phar=Barometric pressure, mm Hg (in. Hg). Ap=Dry gas meter inlet differential pressure, mm H₂O (in. H₂O). 8=Run time, min. 7.1.1.5 Compare the three Yds values at each of the flow rates and determine the maximum and minimum values. The difference between the maximum and minimum values at each flow rate should be no greater than 0.030. Extra sets of triplicate runs may be made in order to complete this requirement. In addition. the meter coefficients should be between 0.95 and 1.05. If these specifications cannot be met in three sets of successive triplicate runs, the meter is not suitable as a calibration standard and should not be used as such. If these specifications are met, average the three Yds values at each flow rate resulting in five average meter coefficients, Yds. 7.1.1.6 Prepare a curve of meter coefficient. Yds, versus flow rate, Q. for the dry gas meter. This curve shall be used as a reference when the meter is used to callbrate other dry gas meters and to determine whether recalibration is required. 7.1.2 Standard Dry Gas Meter Recalibration. 7.1.2.1 Recalibrate the standard dry gas meter against a wet test meter or spirometer annually or after every 200 hours of operation, whichever comes first. This requirement is valid provided the standard dry gas meter is kept in a laboratory and, If transported. cared for as any other laboratory instrument. Abuse to the standard meter may cause a change in the callbration and will require more frequent recalibrations. 7.1.2.2 As an alternative to full recalibration, a two-point calibration check may be made. Follow the same procedure and equipment arrangement as for a full recalibration, but run the meter at only two flow rates [suggested rates are 14 and 28 liters/min (0.5 and 1.0 cfm)]. Calculate the meter coefficients for these two points, and compare the values with the meter calibration curve. If the two coefficients are within ±1.5 percent of the callbration curve values at the same flow rates, the meter need not be recalibrated until the next date for a recalibration check. 7.2 Critical Orifices As Calibration Standards. Critical orifices may be used as callbration standards in place of the wet test meter specified in Section 5.3. provided that they are selected, calibrated, and used as follows: 7.2.1 Section of Critical Orifices. 7.2.1.1 The procedure that follows describes the use of hypodermic needles or stainless steel needle tubings which have been found suitable for use as critical orifices. Other materials and critical orifice designs may be used provided the orifices act as true critical orifices: i.e., a critical vacuum can be obtained, as described in Section 7.2.2.2.3. Select five critical orifices that are appropriately sized to cover the range of flow rates between 10 and 34 liters/min or the expected operating range. Two of the critical orifices should bracket the expected operating range. A minimum of three critical orifices will be needed to calibrate a Method 5 dry gas meter (DGM): the other two critical orifices can serve as spares and provide better selection for bracketing the range of operating flow rates. The needle sizes and tubing lengths shown below give the following approximate flow rates: Gauge/cm Flow rate (li- Flow rate (IIters/min) Gauge/cm ters/min) 12/7.6 32.56 14/2.5 19.54 12/10.2 30.02 14/5.1 17.27 13/2.5 25.77 14/7.6 16.14 13/5.1 23.50 15/3.2 14.16 13/7.6 22.37 15/7.6 11.61 13/10.2 20.67 15/10.2 10.48 7.2.1.2 These needles can be adapted to a Method 5 type sampling train as follows: Insert a serum bottle stopper. 13- by 20-mm sleeve type. into a 1/2-inch Swagelok quick connect. Insert the needle into the stopper as shown in Figure 5-9. Environmental Protection Agency, EPA EC01JN92.111 7.2.2 Critical Orifice Calibration. The procedure described In this section uses the Method 5 meter box configuration with a DGM as described in Section 2.1.8 to callbrate the critical orifices. Other schemes may be used, subject to the approval of the Administrator. 7.2.2.1 Calibration of Meter Box. The critical orifices must be calibrated in the same configuration as they will be used; i.e., there should be no connections to the inlet of the orifice. 7.2.2.1.1 Before calibrating the meter box, leak check the system as follows: Fully open the coarse adjust valve, and completely close the by-pass valve. Plug the inlet. Then trun on the pump, and determine whether there is any leakage. The leakage rate shall be zero; Le., no detectable movement of the DGM dial shall be seen for 1 minute. 7.2.2.1.2 Check also for leakages in that portion of the sampling train between the pump and the orifice meter. See Section 5.8 for the procedure: make any corrections, if necessary. If leakage is detected, check for cracked gaskets, loose fittings, worn O-rings, etc., and make the necessary repairs. 7.2.2.1.3 After determining that the meter box is leakless. calibrate the meter box according to the procedure given in Section 5.3. Make sure that the wet test meter meets the requirements stated in Section 7.1.1.1. Check the water level in the wet test meter. Record the DGM calibration factor, Y. 7.2.2.2 Calibration of Critical Orifices. Set up the apparatus as shown in Figure 5-10. EC01JN92.112 7.2.2.2.1 Allow a warm-up time of 15 minutes. This step is important to equilibrate the temperature conditions through the DGM. 7.2.2.2.2 Leak check the system as in Section 7.2.2.1.1. The leakage rate shall be zero. 7.2.2.2.3 Before calibrating the critical orifice, determine its suitability and the appropriate operating vacuum as follows: Turn on the pump, fully open the coarse adjust valve, and adjust the by-pass valve to give a vacuum reading corresponding to about half of atmospheric pressure. Observe the meter box orifice manometer reading, H. Slowly increase the vacuum reading until a stable reading is obtained on the meter box orifice manometer. Record the critical vacuum for each orifice. Orifices that do not reach a critical value shall not be used. 7.2.2.2.4 Obtain the barometric pressure using a barometer as described in Section 2.1.9. Record the barometric pressure. Phar, In mm Hg (in. Hg). 7.2.2.2.5 Conduct duplicate runs at a vacuum of 25 to 50 mm Hg (1 to 2 in. Hg) above the critical vacuum. The runs shall be at least 5 minutes each. The DGM volume readings shall be in increments of 0.00283 m³ (0.1 ft3) or in Increments of complete revolutions of the DGM. As a guideline, the times should not differ by more than 3.0 seconds (this includes allowance for changes In the DGM temperatures) to achieve ± 0.5 percent in K'. Record the information listed in Figure 5-11. 7.2.2.2.6 Calculate K' using Equation 5-9. EC16N091.131 Where: EC16NO91.132 Temb=Absolute ambient temperature, °K (°R). Average the K' values. The individual K' values should not differ by more than ±0.5 percent from the average. 7.2.3 Using the Critical Orifices as Callbration Standards. 7.2.3.1 Record the barometric pressure. Date Train ID DGM cal. factor Critical orifice ID Run number Dry gas meter 1 2 Final reading m³(ff) Initial reading m3(ft3) Difference, Vm m3 (ft') Iniet/Outlet temperatures: Initial °C °F) , / Final °C °F) / / Avg. Temperature, °C °F) L. Time, e min/sec / / Run number Dry gas meter 1 2 min Orifice man. rdg., A H mm (in.) H2O Bar. pressure, Phar mm (in.) Hg Ambient temperature, °C (°F) Lamb. Pump vacuum mm (in.) Hg K' factor Average Figure 5-11. Data sheet for determining K' factor. 7.2.3.2 Calibrate the metering system according to the procedure outlined in Sections 7.2.2.2.1 to 7.2.2.2.5. Record the Information listed in Figure 5.12. 7.2.3.3 Calculate the standard volumes of air passed through the DGM and the critical orifices, and calculate the DGM calibration factor, Y. using the equations below: EC16NO91.133 EC16NO91.249 EC16NO91.250 where: Ver(sta)=Volume of gas sample passed through the critical orifice, corrected to standard conditions, dsm 3 (dsef). K,=0.3858 "K/mm Hg for metric units =17.64 R/in. Hg for English units. 7.2.3.4 Average the DGM calibration values for each of the flow rates. The calibration factor, Y, at each of the flow rates should not differ by more than +2 percent from the average. 7.2.3.5 To determine the need for recalibrating the critical orifices, compare the DGM Y factors obtained from two adjacent orifices each time a DGM is calibrated; for example, when checking 13/2.5, use orifices 12/10.2 and 13/5.1. If any critical orifice yields a DGM Y factor differing by more than 2 percent from the others. recalibrate the critical orifice according to Section 7.2.2.2. Date Train ID Critical orifice ID Critical orifice K' factor Pt. 60, App. A, Meth. 5 Run number Dry gas meter 1 2 Final reading nt (ft3) Initial reading ni (ft3) Difference, Vₘ m3 (ff3) Iniet/outlet temperatures: Initial °C (°F) / / Final °C (°F) / / Avg. Temperature, Ln °C (°F) Time, e min/sec / 1 min Orifice man. rdg., A H mm (in.) H₂O. Bar. pressure, Pher mm (in.) Hg Ambient temperature, Lamb °C (°F) Pump vacuum mm (in.) Hg Vm(mg) m3 (ft') Ver(mtd) m3 (ft3) DGM cal. factor, Y Figure 5-12. Data sheet for determining DGM Y factor. 8. Bibliography 1. Addendum to Specifications for Incinerator Testing at Federal Facilities. PHS, NCAPC. Dec. 6, 1967. 2. Martin, Robert M. Construction Details of Isokinetic Source-Sampling Equipment. Environmental Protection Agency. Research Triangle Park, NC. APTD-0581. April 1971. 3. Rom, Jerome J. Maintenance, Calibration, and Operation of Isokinetic Source Sampling Equipment. Environmental Protection Agency. Research Triangle Park, NC. APTD-0576. March, 1972. 4. Smith, W. S., R. T. Shigehara, and W.F. Todd. A Method of Interpreting Stack Sampling Data. Paper Presented at the 63d Annual Meeting of the Air Pollution Control Association, St. Louis, MO. June 14-19, 1970. 5. Smith, W. S., et al. Stack Gas Sampling Improved and Simplified With New Equipment. APCA Paper No. 67-119. 1967. 6. Specifications for Incinerator Testing at Federal Facilities. PHS. NCAPC. 1967. 7. Shigehara, R. T. Adjustments in the EPA Nomograph for Different Pitot Tube Coefficients and Dry Molecular Weights. Stack Sampling News 2:4-11, October. 1974. 8. Vollaro, R. F. A Survey of Commercially Available Instrumentation For the Measurement of Low-Range Gas Velocities. U.S. Environmental Protection Agency, Emission Measurement Branch. Research Triangle Park, NC. November, 1976 (unpublished paper). 9. Annual Book of ASTM Standards. Part 26. Gaseous Fuels: Coal and Coke; Atmospheric Analysis. American Society for Testing and Materials. Philadelphia. PA. 1974. pp. 617-622. 10. Felix. L. G., G. I. Clinard, G. E. Lacey. and J. D. McCain. Inertial Cascade Impactor Substrate Media for Flue Gas Sampling. U.S. Environmental Protection Agency. Research Triangle Park, NC 27711, Publication No. EPA-6007-77-060. June 1977. 83 p. 11. Westlin, P. R. and R. T. Shigehara. Procedure for Calibrating and Using Dry Gas Volume Meters as Calibration Standards. Source Evaluation Society Newsletter. 3(1):17-30. February 1978. 12. Lodge, J.P., Jr., J.B. Pate, B.E. Ammons, and G.A. Swanson. The Use of Hypodermic Needles as Critical Orifices in Air Sampling. J. Air Pollution Control Association. 16:197-200. 1966. METHOD 5A-DETERMINATION OF PARTICULATE EMISSIONS FROM THE ASPHALT PROCESSING AND ASPHALT ROOFING INDUSTRY 1. Applicability and Principle 1.1 Applicability. This method applies to the determination of particulate emissions from asphalt roofing industry process saturators, blowing stills, and other sources as specified in the regulations. 1.2 Principle. Particulate matter is withdrawn isokinetically from the source and collected on a glass filter fiber maintained at a temperature of °+10 °C (108°±18 °F). The particulate mass. which includes any material that condenses at or above the filtration temperature, is determined gravimetrically after removal of uncombined water. 2. Apparatus 2.1 Sampling Train. The sampling train conflguration is the same as shown in Figure 5-1 of Method 5. The sampling train consists of the following components: 2.1.1 Probe Nozzle. Pitot Tube, Differential Pressure Gauge, Filter Holder, Condenser, Metering System. Barometer, and Gas Density Determination Equipment. Same as Method 5. Sections 2.1.1, 2.1.3 to 2.1.5, and 2.1.7 to 2.1.10, respectively. 2.1.2 Probe Liner. Same as in Method 5.