United States Environmental Protection Agency Petroleum and Natural Gas Systems &EFA Monitoring Checklist for Underground Natural Gas Storage Final Rule: Mandatory Reporting of Greenhouse Gases (40 CFR Part 98) What must be monitored? If emissions are going to flares, need data elements under the source flare stacks (see Monitoring Checklist for Onshore Petroleum and Natural Gas Production). Record these parameters on an annual basis, unless specified otherwise. 1. Reciprocating Compressor Rod Packing Venting Record emissions at each reciprocating compressor in as-found mode. Each mode must be monitored at least once in any three consecutive calendar years. Reciprocating Compressor Emissions in Operating Mode: ~ Rod packing venting from ~ Blowdown vent emissions from reciprocating compressor in reciprocating compressor in operational operational mode (standard cubic mode (standard cubic feet per hour) feet per hour) ~ Total time the compressor is in ~ Annual throughput (million standard operating mode (hours) cubic feet per day) ~ Mole fraction of GHG in the vent gas Reciprocating Compressors Emissions in Standby Pressurized Mode: ~ Blowdown vent emissions from ~ Total time the reciprocating compressor is reciprocating compressor in standby in standby, pressurized mode (hours) pressurized mode (standard cubic feet) ~ Mole fraction of GHG in the vent gas Petroleum and Natural Gas Monitoring Checklist Underground Natural Gas Storage Page 1 of 6 40 CFR 98, subpart W September 2010 ------- Reciprocating Compressors in Shutdown, Depressurized Mode: ~ Unit isolation valve emissions from ~ Total time the reciprocating compressor is reciprocating compressor in in shutdown, depressurized mode (hours) shutdown depressurized mode (standard cubic feet) ~ Mole fraction of GHG in the vent gas Record emission factors for recip ~ Total annual reciprocating ~ compressor emissions in operating mode (cubic feet) ~ Total annual reciprocating ~ compressor emissions in shut down, depressurized mode (cubic feet) ~ Total number of compressors ~ measured in standby, pressurized mode ing compressors in each mode. Total annual reciprocating compressor emissions in standby, pressurized mode (cubic feet) Total number of compressors measured in operating mode Total number of compressors measured in shutdown, depressurized mode ~ Emission factor for rod packing ~ vent emission in operating mode (cubic feet per hour) ~ Emission factor for blowdown vent ~ emissions in standby pressurized mode (cubic feet per hour) Emission factor for blowdown vent emissions in operating mode (cubic feet per hour) Emission factor for isolation valve in shutdown, depressurized mode (cubic feet per hour) Record emissions from each reciprocating compressor in all modes and total annual emissions. ~ Total annual compressor emission ~ from all modes of operation (standard cubic feet) ~ Total time the reciprocating ~ compressor is in standby, pressurized mode in reporting year (hours) Total time the compressor is in operating mode in reporting year (hours) Total time the reciprocating compressor is in shutdown, depressurized mode in reporting year (hours) Petroleum and Natural Gas Monitoring Checklist Underground Natural Gas Storage Page 2 of 6 40 CFR 98, subpart W September 2010 ------- 2. Centrifugal Compressor Venting Record emissions at both wet and dry seal centrifugal compressors in as- found mode. Each mode must be monitored at least once in any three consecutive calendar years. Centrifugal Compressor Emissions in Operating Mode, Wet and Dry Seal Compressors: ~ Wet seal oil degassing vents ~ emissions from centrifugal compressor in operational mode (standard cubic feet per hour) ~ Total time the centrifugal ~ compressor is in operating mode (hours) ~ Type of meters used for making ~ measurements ~ Mole fraction of GHG in the vent ~ gas Blowdown vent emissions centrifugal compressor in operational mode (standard cubic feet per hour) Number of wet seals connected to the degassing vent Fraction of operating time vent gas is sent to vapor recovery or fuel gas Annual throughput (million standard cubic feet per day) Centrifugal Compressors in Not-operating, Depressurized Mode, Wet and Dry Seal Compressors: ~ Unit isolation valve emissions from ~ Total time the centrifugal compressor is in centrifugal compressor in shutdown shutdown, depressurized mode (hours) depressurized mode (standard cubic feet) ~ Mole fraction of GHG in the vent gas Record emission factors for cent ~ Total annual emissions from all ~ centrifugal compressor in operating mode (cubic feet) ~ Total number of centrifugal ~ compressors measured in operating Petroleum and Natural Gas Monitoring Checklist Underground Natural Gas Storage Page 3 of 6 ;al compressors in each mode. Total annual emissions from all centrifugal compressor in shut down, depressurized mode (cubic feet) Total number of centrifugal compressors measured in shutdown, depressurized 40 CFR 98, subpart W September 2010 ------- mode mode ~ Emission factor for wet seal ~ Emission factor for blowdown vent degassing vent in operating mode emissions in operating mode (cubic feet (cubic feet per hour) per hour) ~ Emission factor for isolation valve in shutdown, depressurized mode (cubic feet per hour) Record emissions from each centrifugal compressor in all modes and total annual emissions. ~ Total annual centrifugal compressor ~ Total time the centrifugal compressor is in emission from all modes of operating mode in reporting year (hours) operation (standard cubic feet) ~ Total time the centrifugal compressor is in shutdown, depressurized mode in reporting year (hours) 3. Natural Gas Pneumatic Device Venting ~ Actual and estimated counts of ~ Actual and estimated counts of high bleed devices intermittent bleed devices ~ Actual and estimated counts of low bleed devices 4. Connector Equipment Leaks Using Leak Detection at Storage Stations ~ Report CO2 emissions from all ~ Report CH4 emissions from all connectors connectors (standard cubic feet) (standard cubic feet) ~ Operating time of leaking ~ Total number of components found leaking component (hours) 5. Valve Equipment Leaks Using Leak Detection at Storage Stations ~ Report CO2 emissions from all ~ Report CH4 emissions from all valves valves (standard cubic feet) (standard cubic feet) ~ Operating time of leaking ~ Total number of components found leaking component (hours) 6. Pressure Relief Valve Equipment Leaks Using Leak Detection at Storage Stations Petroleum and Natural Gas Monitoring Checklist Underground Natural Gas Storage Page 4 of 6 40 CFR 98, subpart W September 2010 ------- ~ Report CO2 emissions from all ~ Report CH4 emissions from all pressure pressure relief valves (standard relief valves (standard cubic feet) cubic feet) ~ Operating time of leaking ~ Total number of components found leaking component (hours) 7. Meter Equipment Leaks Using Leak Detection at Storage Stations ~ Report CO2 emissions from all ~ Report CH4 emissions from all meters meters (standard cubic feet) (standard cubic feet) ~ Operating time of leaking ~ Total number of components found leaking component (hours) 8. Open Ended Line Equipment Leaks Using Leak Detection at Storage Stations ~ Report CO2 emissions from all ~ open ended lines (standard cubic feet) ~ Operating time of leaking ~ component (hours) Report CH4 emissions from all open ended lines (standard cubic feet) Total number of components found leaking Count and Factors at Storage Wellheads Report CH4 emissions from all connectors (standard cubic feet) Total number of components 9. Connector Equipment Leaks Using Population ~ Report CO2 emissions from all ~ connectors (standard cubic feet) ~ Operating time of component ~ (hours) 10. Valve Equipment Leaks Using Population Count and Factors at Storage Wellheads ~ Report CO2 emissions from all ~ Report CH4 emissions from all valves valves (standard cubic feet) (standard cubic feet) ~ Operating time of component ~ Total number of components (hours) 11. Pressure Relief Valve Equipment Leaks Using Population Count and Factors at Storage Wellheads ~ Report CO2 emissions from all ~ Report CH4 emissions from all pressure pressure relief valves (standard relief valves (standard cubic feet) cubic feet) ~ Operating time of component ~ Total number of components (hours) 12. Open Ended Line Equipment Leaks Using Population Count and Factors at Storage Wellheads Petroleum and Natural Gas Monitoring Checklist Underground Natural Gas Storage Page 5 of 6 40 CFR 98, subpart W September 2010 ------- Report CO2 emissions from all ~ Report CH4 emissions from all open ended open ended lines (standard cubic lines (standard cubic feet) feet) Operating time of component ~ Total number of components (hours) Petroleum and Natural Gas Monitoring Checklist Underground Natural Gas Storage Page 6 of 6 40 CFR 98, subpart W September 2010 ------- |