The owner or operator shall monitor and calculate NHV cz as specified in paragraph (m) of this section.

For each flare, the owner or operator shall operate the flare to maintain the net heating value of flare combustion zone gas (NHV cz) at or above 270 British thermal units per standard cubic feet (Btu/scf) determined on a 15-minute block period basis when regulated material is routed to the flare for at least 15-minutes. The owner or operator shall monitor V tip using the procedures specified in paragraphs (i) and (k) of this section and monitor gas composition and determine NHV vg using the procedures specified in paragraphs (j) and (l) of this section. (2) V tip must be less than 400 feet per second and also less than the maximum allowed flare tip velocity (V max) as calculated according to the following equation. The owner or operator shall monitor V tipusing the procedures specified in paragraphs (i) and (k) of this section. (1) Except as provided in paragraph (d)(2) of this section, the actual flare tip velocity (V tip) must be less than 60 feet per second. For each flare, the owner or operator shall comply with either paragraph (d)(1) or (2) of this section, provided the appropriate monitoring systems are in-place, whenever regulated material is routed to the flare for at least 15-minutes and the flare vent gas flow rate is less than the smokeless design capacity of the flare. The owner or operator shall monitor for visible emissions from the flare as specified in paragraph (h) of this section. The owner or operator shall specify the smokeless design capacity of each flare and operate with no visible emissions, except for periods not to exceed a total of 5 minutes during any 2 consecutive hours, when regulated material is routed to the flare and the flare vent gas flow rate is less than the smokeless design capacity of the flare. The owner or operator shall monitor for the presence of a pilot flame as specified in paragraph (g) of this section. Deviations in different 15-minute blocks from the same event are considered separate deviations. Each 15-minute block during which there is at least one minute where no pilot flame is present when regulated material is routed to the flare is a deviation of the standard. The owner or operator shall operate each flare with a pilot flame present at all times when regulated material is routed to the flare. The owner or operator may elect to comply with the requirements of paragraph (r) of this section in lieu of the requirements in paragraphs (d) through (f) of this section, as applicable. On or before January 30, 2019, the owner or operator of a flare used as a control device for an emission point subject to this subpart shall meet the applicable requirements for flares as specified in paragraphs (a) through (q) of this section and the applicable requirements in § 63.671. § 63.670 Requirements for flare control devices.

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