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58
Appendix 1: Average Emission Factors
SOCMI Average Emission Factors
Equipment type
Service
Emission Factor
(kg/hr/source)
Valves Gas
Light liquid
Heavy liquid
0.00597
0.00403
0.00023
Pump seals / Agitator seals
Light liquid
Heavy liquid
0.0199
0.00862
Compressor seals
Gas
0.228
Pressure relief valves
Gas
0.104
Connectors All
0.00183
Open-ended lines
All
0.0017
Sampling connections
All
0.0150
SOCMI factors are used to determine equipment leak emissions from chemical plants or
chemical processes within refineries.
These factors are for total organic compound emission rates.
Refinery Average Emission Factors
Equipment type
Service
Emission Factor
(kg/hr/source)
Valves Gas
Light liquid
Heavy liquid
0.0268
0.0109
0.00023
Pump seals / Agitator seals
Light liquid
Heavy liquid
0.114
0.021
Compressor seals
Gas
0.636
Pressure relief valves
Gas
0.16
Connectors All
0.00025
Open-ended lines
All
0.0023
Sampling connections
All
0.0150
59
Refinery factors are used to determine equipment leak fugitive emissions from a refinery
process. For a chemical process located within a refinery that is not specifically considered a
refinery process (for example, an MTBE production unit), the SOCMI factors must be used
rather than the refinery factors.
These factors are for non-methane organic compound emission rates.
Oil and Gas Production Operations Average Emission Factors
Equipment type
Service
Emission Factor
(kg/hr/source)
Valves Gas
Heavy oil
Light oil
Water / Oil
4.5 E-03
8.4 E-06
2.5 E-03
9.8 E-05
Pump seals
Gas
Heavy oil
Light oil
Water / Oil
2.4 E-03
Non available
1.3 E-02
2.4 E-05
Others Gas
Heavy oil
Light oil
Water / Oil
8.8 E-03
3.2 E-05
7.5 E-03
1.4 E-02
Connectors Gas
Heavy oil
Light oil
Water / Oil
2.0 E-04
7.5 E-06
2.1 E-04
1.1 E-04
Flanges Gas
Heavy oil
Light oil
Water / Oil
3.9 E-04
3.9 E-07
1.1 E-04
2.9 E-06
Open-ended lines
Gas
Heavy oil
Light oil
Water / Oil
2.0 E-03
1.4 E-04
1.4 E-03
2.5 E-04
These factors are for total organic compound emission rates.
60
Appendix 2: Example calculation of fugitive emissions
Assuming a process operating gaseous product, calculation of fugitive emissions can be done
like following.
Data for example calculation:
Equipment type /
service
Equipment count
Hours of operation*
(hr/yr)
VOC wt. fraction
Valves / gas
272
8760
1
Compressors / gas
3
8760
1
Relief valves
37
8760
1
Open-ended lines
489
8760
1
Sampling connections
24
8760
1
* Hours of operation include all time in which material is contained in the equipment.
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