40 C.F.R. § Table 13 to Subpart G of Part 63
| Control device | Monitoring equipment required | Parameters to be monitored | Frequency |
| All control devices | 1. Flow indicator installed at all bypass lines to the atmosphere and equipped with continuous recorder bor | 1. Presence of flow diverted from the control device to the atmosphere or | Hourly records of whether the flow indicator was operating and whether a diversion was detected at any time during each hour. |
| 2. Valves sealed closed with car-seal or lock-and-key configuration | 2. Monthly inspections of sealed valves | Monthly. | |
| Thermal Incinerator | Temperature monitoring device installed in firebox or in ductwork immediately downstream of firebox a and equipped with a continuous recorder b | Firebox temperature | Continuous. |
| Catalytic Incinerator | Temperature monitoring device installed in gas stream immediately before and after catalyst bed and equipped with a continuous recorder b | 1. Temperature upstream of catalyst bed or 2. Temperature difference across catalyst bed | Continuous. |
| Flare (if meeting the requirements of § 63.139(c)(3) ) | Heat sensing device installed at the pilot light and equipped with a continuous recorder a | Presence of a flame at the pilot light | Hourly records of whether the monitor was continuously operating and whether the pilot flame was continuously present during each hour. |
| Flare (if meeting the requirements of § 63.108) | The monitoring equipment is specified in § 63.108 | The parameters are specified in § 63.108 | The frequency is specified in § 63.108. |
| Boiler or process heater <44 megawatts and vent stream is not mixed with the primary fuel | Temperature monitoring device installed in firebox a and equipped with continuous recorder b | Combustion temperature | Continuous. |
| Condenser | Temperature monitoring device installed at condenser exit and equipped with continuous recorder b | Condenser exit (product side) temperature | Continuous. |
| Carbon adsorber (regenerative, regenerated onsite) | Integrating regeneration stream flow monitoring device having an accuracy of ±10 percent, and | Total regeneration stream mass or volumetric flow during carbon bed regeneration cycle(s) | For each regeneration cycle, record the total regeneration stream mass or volumetric flow. |
| Carbon bed temperature monitoring device | Temperature of carbon bed after regeneration [and within 15 minutes of completing any cooling cycle(s)] | For each regeneration cycle and within 15 minutes of completing any cooling cycle, record the carbon bed temperature. | |
| Carbon adsorber (Non-regenerative or regenerative, regenerated offsite) | Organic compound concentration monitoring devicec | Organic compound concentration of adsorber exhaust | Daily or at intervals no greater than 20 percent of the design carbon replacement interval, whichever is greater. |
| The monitoring equipment is specified in § 63.139(d)(5) | The parameters are specified in § 63.139(d)(5) | The frequency is specified in § 63.139(d)(5) . | |
| Organic monitoring device d | Organic monitoring device installed at the outlet of the control device | Organic compound concentration of control device exhaust | Continuous. |
| Alternative monitoring parameters | Other parameters may be monitored upon approval from the Administrator in accordance with the requirements in § 63.143(e)(3) |
a Monitor may be installed in the firebox or in the ductwork immediately downstream of the firebox before any substantial heat exchange is encountered
b "Continuous recorder" is defined in § 63.111 of this subpart.
c As an alternative to conducting this monitoring, an owner or operator may replace the carbon in the carbon adsorption system with fresh carbon at a regular predetermined time interval that is less than the carbon replacement interval that is determined by the maximum design flow rate and organic concentration in the gas stream vented to the carbon adsorption system. For each source as defined in § 63.101 , on and after July 15, 2027, this footnote no longer applies.
d A continuous organic monitoring device may be used in lieu of the requirements outlined for thermal incinerators, catalytic incinerators, boilers, process heaters, condensers, and carbon adsorbers.
40 C.F.R. §Table 13 to Subpart G of Part 63