Traverse point number on a diameter Table 1-1. Location of traverse points in circular stacks 20.1 9.7 8.7 7.9 16.9 14.6 12.9 11.6 10.5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 2223 85.3 67.7 34.2 25.0 24 facturing Co., Los Angeles, Calif. Bulletin WP-50, 1968. Standard Method for Sampling Stacks for METHOD 2-DETERMINATION OF STACK GAS 1. Principle and applicability. 1.1 Principle. Stack gas velocity is determined from the gas density and from measurement of the velocity head using a Type S (Stauscheibe or reverse type) pitot tube. 1.2 Applicability. This method should be applied only when specified by the test pro cedures for determining compliance with the New Source Performance Standards. 2. Apparatus. 2.1 Pitot tube-Type S (Figure 2-1), or equivalent, with a coefficient within ±5% over the working range. 2.2 Differential pressure gauge Inclined manometer, or equivalent, to measure velocity head to within 10% of the minimum value. 2.3 Temperature gauge-Thermocouple or equivalent attached to the pitot tube to measure stack temperature to within 1.5% of the minimum absolute stack temperature. 2.4 Pressure gauge-Mercury-filled U-tube manometer, or equivalent, to measure stack pressure to within 0.1 in. Hg. 2.5 Barometer-To measure atmospheric pressure to within 0.1 in. Hg. 2.6 Gas analyzer-To analyze gas composition for determining molecular weight. 2.7 Pitot tube Standard type, to calibrate Type S pitot tube. 3. Procedure. 3.1 Set up the apparatus as shown in Figure 2-1. Make sure all connections are tight and leak free. Measure the velocity head and temperature at the traverse points specified by Method 1. 3.2 Measure the static pressure in the stack. 3.3 Determine the stack gas molecular weight by gas analysis and appropriate calculations as indicated in Method 3. PIPE COUPLING TUBING ADAPTER TYPE S PITOT TUBE' MANOMETER Figure 2-1. Pitot tube-manometer assembly. 66-088-7210 Mark, L. S., Mechanical Engineers' Handbook, McGraw-Hill Book Co., Inc., New York, N.Y., 1951. Perry, J. H., Chemical Engineers' Handbook, McGraw-Hill Book Co., Inc., New York, N.Y., 1960. Shigehara, R. T., W. F. Todd, and W. S. Smith, Significance of Errors in Stack Sampling Measurements. Paper presented at the Annual Meeting of the Air Pollution Control Association, St. Louis, Mo., June 14-19, 1970. Standard Method for Sampling Stacks for Particulate Matter, In: 1971 Book of ASTM Standards, Part 23, Philadelphia, Pa., 1971, ASTM Designation D-2928–71. Vennard, J. K., Elementary Fluid Mechanics, John Wiley & Sons, Inc., New York, N.Y., 1947. |