| For . . .
| For this operating limit . . .
| You shall demonstrate continuous compliance by . . .
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| 1. Subject to NSPS. Each new or existing Claus sulfur recovery unit part of a sulfur recovery plant with design capacity greater than 20 LTD and subject to the NSPS for sulfur oxides in 40 CFR 60.104(a)(2) or 60.102a(f)(1) | Not applicable | Meeting the requirements of Table 34 of this subpart.
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| 2. Option 1: Elect NSPS. Each new or existing sulfur recovery unit (Claus or other type, regardless of size) not subject to the NSPS for sulfur oxides in 40 CFR 60.104(a)(2) or 60.102a(f)(1) | Not applicable | Meeting the requirements of Table 34 of this subpart.
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| 3. Option 2: TRS limit. Each new or existing sulfur recovery unit (Claus or other type, regardless of size) not subject to the NSPS for sulfur oxides in 40 CFR 60.104(a)(2) or 60.102a(f)(1) | a. Maintain the daily average combustion zone temperature above the level established during the performance test | Collecting the hourly and daily average temperature monitoring data according to § 63.1572; and maintaining the daily average combustion zone temperature at or above the limit established during the performance test
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| | b. The daily average oxygen concentration in the vent stream (percent, dry basis) must not fall below the level established during the performance test. | Collecting the hourly and daily average O2 monitoring data according to § 63.1572; and maintaining the average O2 concentration above the level established during the performance test.
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| 4. Startup or shutdown option 1: Electing to comply with § 63.1568(a)(4)(ii). Each new or existing sulfur recovery unit (Claus or other type, regardless of size) during periods of startup or shutdown | Using a flare meeting the requirements in § 63.11(b) or § 63.670 | On and after January 30, 2019, complying with the applicable requirements of § 63.670. Prior to January 30, 2019, complying with the applicable requirements of either § 63.11(b) or § 63.670.
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| 5. Startup or shutdown option 2: Electing to comply with § 63.1568(a)(4)(iii). Each new or existing sulfur recovery unit (Claus or other type, regardless of size) during periods of startup or shutdown | a. Minimum hourly average temperature of 1,200 degrees Fahrenheit | Collecting continuous (at least once every 15 minutes) and hourly average temperature monitoring data according to § 63.1572; and maintaining the daily average firebox temperature at or above 1,200 degrees Fahrenheit.
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| | b. Minimum hourly average outlet oxygen concentration of 2 volume percent (dry basis) | Collecting continuous (at least once every 15 minutes) and hourly average O2 monitoring data according to § 63.1572; and maintaining the average O2 concentration at or above 2 volume percent (dry basis). |