40 CFR 63.7823 - What test methods and other procedures must I use to demonstrate initial compliance with the opacity limits?
(a) You must conduct each performance test that applies to your affected source according to the requirements in § 63.7(h)(5) and the conditions detailed in paragraphs (b) through (d) of this section.
(2) Obtain a minimum of 30 6-minute block averages. For a blast furnace casthouse, make observations during tapping of the furnace. Tapping begins when the furnace is opened, usually by creating a hole near the bottom of the furnace, and ends when the hole is plugged.
(1) For an existing BOPF shop:
(i) Using a certified observer, determine the opacity of emissions according to Method 9 in appendix A to part 60 of this chapter except as specified in paragraphs (d)(1)(ii) and (iii) of this section.
(ii) Instead of procedures in section 2.4 of Method 9 in appendix A to part 60 of this chapter, record observations to the nearest 5 percent at 15-second intervals for at least three steel production cycles.
(iii) Instead of procedures in section 2.5 of Method 9 in appendix A to part 60 of this chapter, determine the 3-minute block average opacity from the average of 12 consecutive observations recorded at 15-second intervals.
(2) For a new BOPF shop housing a bottom-blown BOPF:
(ii) Determine the highest and second highest sets of 6-minute block average opacities for each steel production cycle.
(3) For a new BOPF shop housing a top-blown BOPF:
(ii) Determine the highest and second highest sets of 3-minute block average opacities for each steel production cycle.
(4) Opacity observations must cover the entire steel production cycle and must be made for at least three cycles. The steel production cycle begins when the scrap is charged to the furnace and ends 3 minutes after the slag is emptied from the vessel into the slag pot.
(5) Determine and record the starting and stopping times of the steel production cycle.
(2) Obtain a minimum of 30 6-minute block averages.