New Mexico Administrative Code › Title 20 - ENVIRONMENTAL PROTECTION › Chapter 2 - AIR QUALITY (STATEWIDE) › Part 14 - PARTICULATE EMISSIONS FROM COAL BURNING EQUIPMENT › Section 20.2.14.301 - PROCEDURE I, METHOD

Current through Register Vol. 35, No. 13, July 16, 2024
A.
				Principle: Particulate matter is withdrawn at an approximately isokinetic rate
				from the source, the large (over 2u) [over 2 micrometer] particles separated
				from the gas stream, and the fine particles collected on a filter. The weight
				of the fine particles is determined gravimetrically after removal of uncombined
				water.
B. Apparatus:
(1) Sampling Train: The recommended sampling
				train is shown schematically in Figure 1 (20.2.14.302 NMAC). It is based on the
				US EPA sampling train described in the Code of Federal Regulations, Title 40,
				Part 60, Appendix A, Method 5, Section 2.1 (hereinafter referred to as US EPA
				Method 5). To the Method 5 train is added a particle separator. The purpose of
				the particle separator is to trap essentially all of the particles greater than
				2u [two micrometers]; to do this, a certain gas flowrate is required through
				this device as specified in Section 2.2.1.3.
(2) Nozzle: Stainless steel (type 304 or
				316).
(3) Probe: Pyrex glass,
				insulated and heated uniformly to a temperature sufficient to prevent
				condensation from occurring at any point in the tube. For lengths greater than
				about 8 feet, a metal tube may be used. Incoloy 825 is preferred, but types 304
				or 316 stainless steel are acceptable. Long probes shall be reinforced or
				supported to prevent excessive droop or gas stream whip. For sampling stacks
				carrying electrically charged particles (as for installations using
				electrostatic precipitators), the probe shall be grounded to prevent electrical
				shock to personnel and the inner shell of the probe shall be electrically
				conductive and shall be grounded to prevent size discriminative trapping of
				particles within the probe.
(4)
				Particulate Separator and Filter: The particle separator and filter system
				shall be housed in a temperature-controlled container.
(a) Particle Separator: The particle
				separator shall be a cascade impactor, such as the Andersen Mark II or Mark III
				Stack Head, manufactured by 2000 Inc., Atlanta, Georgia, or other if approved
				by the Department. The stack head must be modified to use only five of the
				collection plates arranged in the following order 0, 1, 2, 3, 4, 1
				(manufacturer's numbers) and a filter holder as specified in subparagraph (b)
				of paragraph (4) of subsection B of 20.2.14.301 NMAC. The complete arrangement
				is shown in Figure 2 (20.2.14.303 NMAC). The gas flowrate through the stack
				head must be controlled to maintain a particle impaction efficiency of 50% on
				plate 4 for particles of 2 microns aerodynamic diameter. The procedure for
				doing this is described in paragraphs (3) and (4) of subsection D of
				20.2.14.301 NMAC.
(b) Filter
				Holder: The filter holder shall immediately follow the last collection plate,
				as indicated in Figure 2 (20.2.14.303 NMAC), and contain a filter similar to
				those specified in paragraph (2) of subsection C of 20.2.14.301 NMAC.
(5) Metering System: Vacuum gage,
				leak-free pumps, thermometers capable of measuring to within 3 degrees
				Fahrenheit., dry test meter with 2 percent accuracy, and related equipment, as
				required to maintain an approximately isokinetic sampling rate through the
				probe and specified flowrate through the Andersen Stack Head, and to determine
				sample volume.
(6) Other Sampling
				Train Equipment: Pitot tube (type S, or equivalent), impingers/condensers, and
				barometer shall be as specified in US EPA Method 5, Section 2.1. Note that an
				equivalent condenser may be used in place of the impinger train.
(7) Sample Recovery Accessories: As specified
				in Section 2.2 of US EPA Method 5.
(8) Analytical Accessories: As specified in
				US EPA Method 5, Section 2.3.