Michigan Administrative Code › Department - Environmental Quality › Air Quality Division › Part 10 - INTERMITTENT TESTING AND SAMPLING › Section R. 336.2006 - Reference test method serving as alternate version of federal reference test method 25 by incorporating Byron analysis

Current through Vol. 24-12, July 15, 2024
Rule 1006. When using the alternate version of federal
				  reference test method 25 incorporating the Byron analysis, the procedures in
				  method 25, which are described in R 336.2004, shall be followed, except that
				  all of the following parts in method 25 are amended to read as follows:
1.2 Principle. An emission sample is
				  withdrawn from a stack at a constant rate through a stainless steel absorber
				  tube packed with porasil; the gaseous portion of the sample is pulled past a
				  battery-operated sampling pump into a tedlar bag. After sampling is complete,
				  the contents of the tedlar bag are analyzed on an automated gas chromatograph
				  (GC), and the sample in the porasil packed tube is heated to remove all
				  components for analysis on the GC. The GC separates CO, CO2, and CH4 from the
				  nonmethane organics (NMO), then converts the NMOs to methane for analysis.
2. Apparatus. The sampling system
				  consists of a nonmethane organic (NMO) absorber tube, a sampling pump, and a
				  sample bag (figure 25-1). The analytical system has 2 parts the oven for
				  removing the sample from the absorber tube and an automated gas chromatograph
				  (GC).
2.1 Sampling. All of the
				  following equipment is required, as shown in figure 25-1:
2.1.1 Heated probe. 6.4-millimeter (mm)
				  (1/4-inch (in.)) outside diameter (o.d.) stainless steel tubing with a heating
				  system that is capable of maintaining a gas temperature at the exit end of not
				  less than 129 degrees Centigrade (265 degrees Fahrenheit). The probe shall be
				  equipped with a thermocouple at the exit end to monitor the gas temperature.
				  The nozzle is an elbow fitting that is attached to the front end of the probe
				  while the thermocouple is inserted in the side arm of a tee fitting that is
				  attached to the rear of the probe. The probe is wrapped with a suitable length
				  of high-temperature heating tape and then covered with 2 layers of glass cloth
				  insulation and 1 layer of aluminum foil.
2.1.2 Heated prefilter-only for stacks with
				  possible particulate matter interference. A stainless steel filter holder with
				  a 47-mm type A/E fiberglass filter without organic binder. The entire prefilter
				  shall be maintained at 110 degrees Celsius. Note -if it is not possible to use
				  a heating system for safety reasons, an unheated system with an instack filter
				  is a suitable alternative.
2.1.3
				  NMO absorber tube. 1/2-inch inside diameter (i.d.) stainless steel tube packed
				  with porasil (thermally stable silica gel).
2.1.4 1/4-inch o.d. teflon line that is 2 to
				  4 feet long.
2.1.5 Battery-operated
				  diaphragm sampling pump with kurz digital mass flow meter. Total flow is
				  integrated electronically to measure flow with an accuracy of 1% at any flow
				  rate. (Byron instruments model 90).
2.1.6 Sample bag. 0.3-mil tedlar, 1/2-cubic
				  foot capacity. The sample bag undergoes nitrogen purge cycle until analysis
				  exhibits zero carbon content in the sample bag.