§ 63.1656 Performance testing, test methods, and compliance demonstrations.
(a) Performance testing. (1) All performance tests must be conducted according to the requirements in § 63.7 of subpart A.
(2) Each performance test must consist of three separate and complete runs using the applicable test methods.
(3) Each run must be conducted under conditions that are representative of normal process operations.
(4) Performance tests conducted on air pollution control devices serving submerged arc furnaces must be conducted such that at least one tapping period, or at least 20 minutes of a tapping period, whichever is less, is included in at least two of the three runs. The sampling time for each run must be at least as long as three times the average tapping period of the tested furnace, but no less than 60 minutes.
(5) The sample volume for each run must be at least 0.9 dscm (30 dscf).
(6) You must conduct the performance tests specified in paragraph (c) of this section under such conditions as the Administrator specifies based on representative performance of the affected source for the period being tested. Upon request, you must make available to the Administrator such records as may be necessary to determine the conditions of performance tests.
(b) Test methods. The following test methods in appendix A of part 60 of this chapter must be used to determine compliance with the emission standards.
(1) Method 1 to select the sampling port location and the number of traverse points.
(2) Method 2 to determine the volumetric flow rate of the stack gas.
(3) Method 3 to determine the dry molecular weight of the stack gas.
(4) Method 4 to determine the moisture content of the stack gas.
(5) Method 5 to determine the particulate matter concentration of the stack gas for negative pressure baghouses and positive pressure baghouses with stacks.
(6) Method 5D to determine particulate matter concentration and volumetric flow rate of the stack gas for positive pressure baghouses without stacks.
(7) Method 9 of appendix A–4 of 40 CFR part 60 to determine opacity. ASTM D7520–16, “Standard Test Method for Determining the Opacity of a Plume in the Outdoor Ambient Atmosphere” may be used (incorporated by reference, see § 63.14) with the following conditions:
(i) During the digital camera opacity technique (DCOT) certification procedure outlined in Section 9.2 of ASTM D7520–16, the owner or operator or the DCOT vendor must present the plumes in front of various backgrounds of color and contrast representing conditions anticipated during field use such as blue sky, trees and mixed backgrounds (clouds and/or a sparse tree stand).