| (II) the owner or operator shall include in the quality assurance plan (QAP) required under §115.726(a) of this title, manufacturer's information and data to demonstrate the accuracy and reliability of the analyzer for those monitored constituents for which routine calibration checks are not performed; (iii) the range of calibration standards for the HRVOCs and other constituents may be based on the typical concentrations observed rather than the full potential range of concentrations. Data must be included in the QAP required under §115.726(a) of this title to demonstrate the accuracy of the analyzer at maximum potential concentrations outside of the proposed calibration range; and (iv) the executive director may specify additional calibration requirements during approval of the QAP under §115.726(a)(1)(B) of this title. (B) If the on-line analyzer, required in this paragraph, measures concentrations on a dry basis, the results must be corrected for moisture when determining net heating value according to the requirements in 40 CFR §60.18(f)(3) or when determining mass rates using volumetric flow rates that are on a wet basis. The following methods may be used to determine moisture for this correction: (i) a continuous moisture analyzer installed, calibrated, maintained, and operated according to the manufacturer's recommendations; (ii) assume saturated moisture conditions for the temperature and pressure at the sample extraction point in the flare header for conditions up to 20% moisture by volume; (iii) assume 0% moisture for flare systems where moisture is not expected to be present due to the process nature of the vent streams routed to the flare; or (iv) process information and engineering calculations for conditions, such as steaming operations, where moisture is expected to be greater than 20% by volume; (3) continuously operate each monitoring system as required by this section at least 95% of the time when the flare is operational, averaged over a calendar year. The percent measurement data availability must be calculated as the total flare operating hours for which valid quality-assured data was recorded divided by the total flare operating hours. Time required for normal calibration checks required under paragraphs (1) and (2) of this subsection is not considered downtime for purposes of this calculation; (4) during any period of monitor downtime of the on-line analyzer specified in paragraph (2) of this subsection exceeding eight consecutive hours, take a sample daily, starting within ten hours of the initial on-line analyzer malfunction. The sampling location must be such that the measured constituents, including any supplementary fuel, is representative of all of the major constituents going to the flare system. For determining the HRVOC concentrations in the flare header gas, the samples must be analyzed for the concentrations of HRVOC according to the procedures in 40 CFR Part 60, Appendix A, Method 18 as amended through October 17, 2000 (65 FR 61744). Samples must also be analyzed by American Standard of Testing Materials Standard D1946-77 to determine other potential constituents (e.g., hydrogen, nitrogen, methane, and carbon dioxide, and VOCs other than HRVOCs) sufficient to determine the molecular weight and net heating value of the gas combusted in the flare to within 5.0%. Net heating value of the gas combusted in the flare must be calculated according to the equation given in 40 CFR §60.18(f)(3). During periods of monitor downtime, these samples must be used to demonstrate that continuous compliance with the requirements of §115.722(a) - (d) of this title is met; (5) for each one-hour block period, calculate the average net heating value of the gas combusted in the flare according to the equation given in 40 CFR §60.18(f)(3). Pilot gas must not be included in the determination of the net heating value; (6) for each one-hour block period, calculate the average actual exit velocity of the flare based on continuous flow rate, temperature, and pressure monitor data, according to 40 CFR §60.18(f)(4); and (7) calculate the HRVOC hourly average mass emission rates from the flare using the data gathered according to paragraphs (1) - (6) of this subsection, assuming a 99% destruction efficiency for ethylene and propylene and a 98% destruction efficiency for all other HRVOCs when the flare meets the heating value and exit velocity requirements of 40 CFR §60.18. During each one-hour block period when the flare is not in compliance with the net heating value or exit velocity requirements of 40 CFR §60.18, a destruction efficiency of 93% shall be assumed to calculate HRVOC mass emission rates. (e) Flares used solely for abatement of emissions from marine loading operations or transport vessel loading and unloading operations are not required to comply with the monitoring requirements of subsection (d) of this section, provided the following specific requirements are satisfied. (1) To demonstrate compliance with the minimum net heating value requirements of §115.722(d) of this title, a 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. (2) The flare's actual exit velocity for each loading activity must be calculated on a one-hour block average basis, based on the maximum loading rate and the supplemental fuel rate corrected to standard temperature and pressure and the unobstructed (free) cross-sectional area of the flare tip, according to 40 CFR §60.18(f)(4) to demonstrate compliance with the exit velocity requirements of §115.722(d) of this title. (3) The HRVOC hourly average mass emission rates from the flare must be calculated to demonstrate compliance with the site-wide cap in §115.722 of this title, using total HRVOC sent to the flare calculated based on loading emission calculations, and the speciated composition of the material being sent to the flare, assuming a 99% destruction efficiency for ethylene and propylene and a 98% destruction efficiency for all other HRVOCs when the flare meets the net heating value and exit velocity requirements of 40 CFR §60.18. During each one-hour block period when the flare does not meet the net heating value or exit velocity requirements of 40 CFR §60.18, a destruction efficiency of 93% must be assumed to calculate HRVOC mass emission rates. (4) For flares that receive greater than 95% of an individual HRVOC at all times, the owner or operator may use process knowledge to determine net heating value for demonstrating compliance with §115.722(d) of this title. (f) Flares used solely for abatement of emissions from scheduled or unscheduled maintenance, startup, or shutdown activities must comply with the continuous monitoring requirements in subsection (d) of this section, or satisfy all of the following requirements. (1) A single flare must not be operated in HRVOC service for more than 720 hours at a site in any 12 consecutive months. (2) The total number of hours for which a site may send HRVOCs temporarily to multiple flares as described in this subsection must not exceed 1,440 hours in 12 consecutive months. (3) To demonstrate compliance with the minimum net heating value requirements of §115.722(d) of this title, a 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 per standard cubic foot of the gas. (4) The flow rate of the gas routed to the flare, in standard cubic feet per minute must be determined by either: (A) complying with the monitoring requirements of subsection (d)(1) of this section; or (B) using process knowledge and engineering calculations. (5) The flare's actual exit velocity for each activity must be calculated on a one-hour block average basis, corrected to standard temperature and pressure and the unobstructed (free) cross-sectional area of the flare tip, according to 40 CFR §60.18(f)(4). The HRVOC hourly average mass emission rates from the flare must be calculated to demonstrate compliance with §115.722(a) - (c) of this title, using total HRVOC sent to the flare calculated based on process knowledge or actual measurement, assuming a 99% destruction efficiency for ethylene and propylene and a 98% destruction efficiency for all other HRVOCs when the flare meets the net heating value and exit velocity requirements of 40 CFR §60.18. During each one-hour block period when the flare does not meet the net heating value or exit velocity requirements of 40 CFR §60.18, a destruction efficiency of 93% must be assumed to calculate HRVOC mass emission rates. Cont'd... |
