California Code of Regulations › Title 17 - Public Health › Division 3 - Air Resources › Chapter 1 - Air Resources Board › Subchapter 10 - Climate Change › Article 2 - Mandatory Greenhouse Gas Emissions Reporting › Subarticle 5 - Reporting Requirements and Calculation Methods for Petroleum and Natural Gas Systems › Appendix A - to the Regulation for the Mandatory Reporting of Greenhouse Gas Emissions

Current through Register 2024 Notice Reg. No. 28, July 12, 2024
Emission Factors and Calculation Data for
						  Petroleum and Natural Gas Systems Reporting
Table 1A
Default Whole Gas Emission Factors for
						  Onshore Petroleum and Natural Gas Production
Onshore petroleum and
								  natural gas production
Emission factor
								  (scf/hour/ component)
Western U.S.
Population Emission Factors All
								  components, Gas Service:1
Valve
0.121
Connector
0.017
Open-ended line
0.031
Pressure relief
								  valve
0.193
Low Continuous Bleed Pneumatic Device
								  Vents2
1.39
High Continuous Bleed Pneumatic Device
								  Vents2
37.3
Intermittent Bleed Pneumatic Device
								  Vents2
13.5
Pneumatic
								  Pumps3
13.3
Population Emission Factors -- All
								  Components, Light Crude Service:4
Valve
0.05
Flange
0.003
Connector
0.007
Open-ended Line
0.05
Pump
0.01
Other5
0.30
Population Emission Factors -- All
								  Components, Heavy Crude Service:6
Valve
0.0005
Flange
0.0009
Connector (other)
0.0003
Open-ended Line
0.006
Other5
0.003
1
For multi-phase flow that
						  includes gas, use the gas service emissions factors.
2
Emissions factor is in units
						  of "scf/hour/device."
3
Emission Factor is in units
						  of "scf/hour/pump."
4
Hydrocarbon liquids greater
						  than or equal to 20°API are considered "light crude."
5
"Other" category includes
						  instruments, loading arms, pressure relief valves, stuffing boxes, compressor
						  seals, dump lever arms, and vents.
6
Hydrocarbon liquids less
						  than 20°API are considered "heavy crude."
Table 1B
Default Average Component Counts for
						  Major Onshore Natural Gas Production Equipment
Major
									 equipment
Valves
Connectors
Open-ended
									 lines
Pressure relief
									 valves
Western U.S.
Wellheads
11
36
1
0
Separators
34
106
6
2
Meters/piping
14
51
1
1
Compressors
73
179
3
4
In-line
								  heaters
14
65
2
1
Dehydrators
24
90
2
2
Table 1C
Default Average Component Counts for
						  Major Crude Oil Production Equipment
Major
									 equipment
Valves
Flanges
Connectors
Open-ended
									 lines
Other
									 components
Western U.S.
Wellhead
5
10
4
0
1
Separator
6
12
10
0
0
Heater-treater
8
12
20
0
0
Header
5
10
4
0
0
Table 2
Default Total Hydrocarbon Emission
						  Factors for Onshore Natural Gas Processing
Onshore natural gas
									 processing
Emission factor
									 (scf/hour/component)
Leaker Emission Factors -- Compressor
								  Components, Gas Service
Valve1
14.84
Connector
5.59
Open-Ended Line
17.27
Pressure Relief
								  Valve
39.66
Meter
19.33
Leaker Emission Factors --
								  Non-Compressor Components, Gas Service
Valve1
6.42
Connector
5.71
Open-Ended Line
11.27
Pressure Relief Valve
2.01
Meter
2.93
1
Valves include control
						  valves, block valves and regulator valves.
Table 3
Default Total Hydrocarbon Emission
						  factors for Onshore Natural Gas Transmission Compression
Onshore Natural Gas
									 Transmission compression
Emission factor
									 (scf/hour/component)
Leaker Emission Factors -- Compressor
								  Components, Gas Service
Valve1
14.84
Connector
5.59
Open-Ended Line
17.27
Pressure Relief
								  Valve
39.66
Meter
19.33
Leaker Emission Factors --
								  Non-Compressor Components, Gas Service
Valve1
6.42
Connector
5.71
Open-Ended Line
11.27
Pressure Relief Valve
2.01
Meter
2.93
Population Emission Factors -- Gas
								  Service
Low Continuous Bleed Pneumatic Device
								  Vents2
1.37
High Continuous Bleed Pneumatic Device
								  Vents2
18.20
Intermittent Bleed Pneumatic Device
								  Vents2
2.35
1
Valves include control
						  valves, block valves, and regulator valves.
2
Emission Factor is in units
						  of "scf/hour/component."
Table 4
Default Total Hydrocarbon Emission
						  Factors for Underground Natural Gas Storage
Underground
									 natural gas storage
Emission factor
									 (scf/hour/component)
Leaker Emission Factors -- Storage
								  Station, Gas Service
Valve1
14.84
Connector
5.659
Open-Ended Line
17.27
Pressure Relief
								  valve
39.66
Meter
19.33
Population Emission Factors --
								  Storage Wellheads, Gas Service
Connector
0.01
Valve1
0.1
Pressure Relief Valve
0.17
Open Ended Line
0.03
Population Emission Factor -- Other
								  Components, Gas Service
Low Continuous Bleed Pneumatic Device
								  Vents2
1.37
High Continuous Bleed Pneumatic Device
								  Vents2
18.20
Intermittent Bleed Pneumatic Device
								  Vents2
2.35
1
Valves include control
						  valves, block valves and regulator valves.
2
Emission Factor is in units
						  of "scf/hour/device.
Table 5
Default Methane Emission Factors for
						  Liquefied Natural Gas (LNG) Storage
LNG
									 Storage
Emission factor
									 (scf/hour/component)
Leaker Emission Factors -- LNG
								  storage Components, Gas and Liquids Service
Valve
1.19
Pump Seal
4.00
Connector
0.34
Other1
1.77
Population Emission Factors -- LNG
								  Storage Compressor, Gas Service
Vapor Recovery
								  Compressor2
4.17
1
"other" equipment type
						  should be applied for any equipment type other than connectors, pumps, or
						  valves.
2
Emission Factor is in units
						  of "scf/hour/compressor."
Table 6
Default Methane Emission Factors for LNG
						  Import and Export Equipment
LNG import and
									 export equipment
Emission factor
									 (scf/hour/component)
Leaker Emission Factors -- LNG
								  Terminals Components, Gas and Liquid Service
Valve
1.19
Pump Seal
4.00
Connector
0.34
Other1
1.77
Population Emission Factors -- LNG
								  Terminal Compressor, Gas Service
Vapor Recovery
								  Compressor2
4.17
1
"other" equipment type
						  should be applied for any equipment type other than connectors, pumps, or
						  valves.
2
Emission Factor is in units
						  of "scf/hour/compressor."
Table 7
Default Methane Emission Factors for
						  Natural Gas Distribution
Natural gas
									 distribution
Emission factor
									 (scf/hour/component)
Leaker Emission Factors -- Above
								  Grade M&R at City Gate Stations1
								  Components
Connector
1.69
Block Valve
0.557
Control Valve
9.34
Pressure Relief Valve
0.27
Orifice Meter
0.212
Regulator
0.772
Open-ended Line
26.131
Population Emission Factors -- Below
								  Grade M&R2 Components, Gas
								  Service3
Below Grade M&R Station, Inlet
								  Pressure >300 psig
1.30
Below Grade M&R Station, Inlet
								  Pressure 100 to 300 psig
0.20
Below Grade M&R Station, Inlet
								  Pressure <100 psig
0.10
Natural gas
									 distribution
Emission factor
									 (scf/meter-hour)
Population Emission Factors --
								  Customer Meters
Residential
0.01582
Commercial
0.00547
Industrial
0.00547
Natural gas
									 distribution
Emission factor
									 (scf/hour/component)
Population emission Factors --
								  Distribution Mains, Gas Service4
Unprotected steel
12.58
Protected Steel
0.35
Plastic
1.13
Cast Iron
27.25
Population Emission Factors --
								  Distribution Services, Gas Service5
Unprotected Steel
0.19
Protected Steel
0.02
Plastic
0.001
Copper
0.03
1
City gate stations at
						  custody transfer and excluding customer meters.
2
Excluding customer
						  meters.
3
Emission Factor is in units
						  of "scf/hour/station."
4
Emission Factor is in units
						  of "scf/hour/mile."
5
Emission factor is in units
						  of "scf/hour/number of services."
1. New
						  Appendix A filed 12-19-2012; operative 1-1-2013 pursuant to Government Code
						  section
						  11343.4
						  (Register 2012, No. 51). For prior history of Appendix A, see Register 2011,
						  No. 50.
2. Amendment of Appendix A, Table 7 filed 12-31-2014;
						  operative 1-1-2015 pursuant to Government Code section
						  11343.4(b)(3)
						  (Register 2015, No. 1).
3. Amendment of table 7 adding footnote
						  reference filed 9-1-2017; operative 1-1-2018 (Register 2017, No.
						  35).