| (I) the requirements in subsection (e)(2) and (3) of this section during any loading operation, as specified in subsection (e) of this section; and (II) the requirements in subsection (f)(4) and (5) of this section during any emissions event or scheduled startup, shutdown, or maintenance activity; (iii) for flares used for scheduled or unscheduled startup, shutdown, or maintenance activities, as specified in subsection (f) of this section, the operational time limits in subsection (f)(1) and (2) of this section apply for time periods involving those specified activities; and (iv) for flares used as emergency flares, as specified in §115.725(g), the requirements in subsection (g)(2)(A) - (D) of this section apply; and (C) multiple clauses under subparagraph (B) of this paragraph apply. For example, a flare used for emergencies and startup, shutdown, and maintenance activities is subject to subparagraph (B)(i), (ii)(II), (iii), and (iv) of this paragraph. (l) The owner or operator shall continuously operate each monitoring system as required by this section at least 95% of the operational time of the applicable flare, vent gas stream, or pressure relief valve, averaged over a calendar year. The percent measurement data availability must be calculated as the total operating hours for which valid quality-assured data was recorded divided by the total operating hours. Time required for normal calibration checks required by the provisions of this section is not considered downtime for purposes of this calculation. For the purposes of this calculation, the following apply: (1) the operational time of an affected flare is any time the flare has the potential to receive HRVOCs; (2) the operational time of an affected vent gas stream is any time the vent gas stream has the potential to emit HRVOCs; and (3) the operational time of an affected pressure relief valve is any time HRVOCs are present upstream of the pressure relief valve. (m) Minor modifications to either test methods or monitoring methods may be approved by the executive director. Test methods or monitoring methods other than those specified in this section may be used if approved by the executive director and validated by 40 CFR Part 63, Appendix A, Test Method 301 (December 29, 1992). For the purposes of this subsection, substitute "executive director" in each place that Test Method 301 references "administrator." The owner or operator does not require prior approval from the executive director for the following alternative monitoring approaches. (1) In lieu of monitoring constituents for net heating value in accordance with subsection (d) (2) of this section, the owner or operator may install an online calorimeter to determine the net heating value. The calorimeter must be calibrated, installed, operated, and maintained, in accordance with manufacturer recommendations, to continuously measure and record the net heating value of the gas sent to the flare, in British thermal units/standard cubic foot of the gas; and (2) The owner or operator may elect to demonstrate compliance with the minimum net heating value requirements of §115.722(d) of this title using the following procedure: (A) install, calibrate, operate, and maintain a continuous flow monitor to monitor the supplementary fuel used to increase the net heating value of the gas stream sent to the flare; and (B) continuously maintain sufficient supplementary fuel flow to meet the minimum net heating value requirements specified in §115.722(d) of this title while assuming zero net heating value contribution from all vent gas streams routed to the flare. (3) The owner or operator of a flare in dedicated service for storage tanks with 95% or greater of an individual HRVOC may elect to determine net heating value and HRVOC concentrations using process knowledge and engineering calculations in lieu of the on-line analyzer required in subsection (d)(2) of this section. (n) Upon written request by the executive director, the owner or operator shall submit the engineering calculations and process information used to determine volumetric flow rate, flare tip exit velocity, net heating value, and HRVOC emissions for compliance with the requirements of §115.722(a) - (d) of this title where applicable under the requirements of this section. The information must be submitted within 30 days for review. |
| Source Note: The provisions of this §115.725 adopted to be effective January 17, 2003, 28 TexReg 113; amended to be effective November 13, 2003, 28 TexReg 9835; amended to be effective December 23, 2004, 29 TexReg 11623 |
