Figure 4-5. Field moisture determination— approximation method. 3.2.2 Connect the probe, insert it into the stack, and sample at a constant rate of 2 1pm (0.071 cfm). Continue sampling until the dry gas meter registers about 30 liters (1.1 ft3) or until visible liquid droplets are carried over from the first impinger to the second. Record temperature, pressure, and dry gas meter readings as required by Figure 4-5. 3.2.3 After collecting the sample, combine the contents of the two impingers and measure the volume to the nearest 0.5 ml. 3.3 Calculations. The calculation method presented is designed to estimate the moisture in the stack gas; therefore, other data, which are only necessary for accurate moisture determinations, are not collected. The following equations adequately estimate the moisture content, for the purpose of determining isokinetic sampling rate settings. 3.3.1 Nomenclature. Bwm Approximate proportion, by volume, of water vapor in the gas stream leaving the second impinger, 0.025. Bus Water vapor in the gas stream, proportion by volume. Mu Molecular weight of water, 18.0 g/gmole (18.0 lb/lb-mole). Pm Absolute pressure (for this method, same as barometric pressure) at the dry gas meter. Pald Standard absolute pressure, 760 mm Hg (29.92 in. Hg). R-Ideal gas constant, 0.06236 (mm Hg) (m3)/(g-mole) (°K) for metric units and 21.85 (in. Hg) (ft3)/lb-mole) (°R) for English units. Tm = Absolute temperature at meter, °K (°R). Tad Standard absolute temperature, 293° K (528° R). V=Final volume of impinger contents, ml. Vm(std) Dry gas volume measured by dry gas meter, corrected to standard conditions, dscm (dscf). Vwc (std)= Volume of water vapor condensed, corrected to standard conditions, scm (scf). Pw-Density of water, 0.9982 g/ml (0.002201 lb/ml). Y=Dry gas meter calibration factor. 3.3.2 Volume of water vapor collected. where: 4.1 For the reference method, calibrate equipment as specified in the following sections of Method 5: Section 5.3 (metering system); Section 5.5 (temperature gauges); and Section 5.7 (barometer). The recommended leak check of the metering system (Section 5.6 of Method 5) also applies to the reference method. For the approximation method, use the procedures outlined in Section 5.1.1 of Method 6 to calibrate the metering system, and the procedure of Method 5, Section 5.7 to calibrate the barometer. 5. Bibliography ufacturing Co., Los Angeles, Calif. 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 applica-. ble 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 Section 7); commercial models of this train are also available. For changes from APTD0581 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 Section 7). Since correct usage is important in obtaining valid results, all users should read APTD-0576 and adopt the operating and maintenance procedures outlined in it, unless otherwise specified herein. The sampling train consists of the following components: |