Emission Source Activity Data GHGRP Data Annual Emissions tonnes CH4 Facility Throughput Quantity of gas delivered to end users Yes Vented Sources Pneumatic Devices Count of high bleed pneumatic controllers No Annual CH4 Emissions (Applies emission factor) Count of intermittent bleed pneumatic controllers No Annual CH4 Emissions (Applies emission factor) Count of low bleed pneumatic controllers No Annual CH4 Emissions (Applies emission factor) Dehydrator Vents Count of dehydrators > 0.4 MMscfd Yes Count of dehydrators < 0.4 MMscfd Yes Count of desiccant dehydrators Yes Count of Dehydrators venting to Flare or Regenerator Firebox/Fire Tubes Yes Annual CH4 emissions from dehydrators venting to a flare or regenerator firebox/fire tubes Count of dehydrators vented to Vapor Recovery Units Yes Annual CH4 Emissions from all dehydrators that were not vented to a flare or regenerator firebox/fire tubes Acid Gas Removal Units Count of AGR Units No Annual CH4 Emissions (Applies GHGI emission factor) Fugitive Sources Equipment Yes Annual emissions from compressor components Yes Annual emissions from components Indicate if the facility used the alternate method (company based EF) No Annual CH4 Emissions from fugitive sources Centrifugal Compressors Number of centrifugal compressors with wet seals Yes Annual CH4 emissions vented to the atmosphere Number of centrifugal compressors with dry seals Yes Count of compressors using the alternate method No Count of manifolded groups Yes Count of routed to flare Yes Count of routed to vapor recovery Yes of compressors using the alternate method Annual CH4 Emissions Reciprocating Compressors Count of compressor vented rod packing Yes Annual CH4 emissions vented to the atmosphere from isolation valves, blowdown valves, and rod packing (including estimated fraction of CH4 from manifolded compressor sources) Count of compressor rod packing w/ flare or captured of compressor isolation valves w/control Count of compressors blowdown valves w/control Count of manifolded groups Count of compressors using the alternate method Annual CH4 Emissions Routine Maintenance Blowdown Vent Stacks Count of blowdowns by equipment type Yes Annual emissions by equipment or event type Yes Annual emissions calculated by flow Combustion Sources
Gas Engines and Turbines Count of individual units Yes Annual CH4 Emissions Number of combustion units included in aggregated group Yes Annual CH4 Emissions Number of combustion units sharing a common stack or duct Yes Annual CH4 Emissions Number of combustion units shared by a common fuel supply line Yes Annual CH4 Emissions Flares Count of flare stacks Yes Annual CH4 Emissions Table B.4: Transmission and Storage Facility Level Data Requirements Emission Source Activity Data Data Annual Emissions, tonnes CH4 Facility Throughput Quantity of gas transported (as reported to EIA Form 176) No Vented Sources Pneumatic Devices (Transmission) Count of high bleed pneumatic controllers Yes Annual CH4 Emissions Count of intermittent bleed pneumatic controllers Yes Annual CH4 Emissions Count of low bleed pneumatic controllers Yes Annual CH4 Emissions Pneumatic Devices (Storage) of high bleed pneumatic controllers Yes Annual CH4 Emissions Count of intermittent bleed pneumatic controllers Yes Annual CH4 Emissions Count of low bleed pneumatic controllers Yes Annual CH4 Emissions Dehydrator Vents (Transmission) Count of dehydrators No Annual CH4 Emissions (Applies GHGI emission factor) Dehydrator Vents (Storage) Count of dehydrators No Annual CH4 Emissions (Applies GHGI emission factor) Storage Tanks (Transmission) Count of storage tank vent stacks with flares attached Yes Count of storage tank vent stacks without flares attached Yes Count of storage tank vent stacks with dump valve leakage direct to atmosphere Yes Annual CH4 emissions from storage tank vent stacks with dump leakage venting gas directly to the atmosphere Count of storage tank vent stacks with flared dump valve leakage Yes Annual CH4 emissions from storage tank vent stacks with flared dump valve leakage Count of storage tanks using the alternate calculation method No Annual CH4 Emissions Fugitive Sources
Equipment Leaks (Compressor Stations) Yes Annual emissions from components Indicate if the facility used the alternate method (company based EF) No Annual CH4 Emissions from fugitive sources Transmission Pipeline Leaks of pipeline No Annual CH4 Emissions (Applies GHGI emission factor) Equipment Leaks (Storage Wellheads) Yes Annual emissions from components based on leak surveys and leaker factors Equipment Leaks (Storage Stations) Yes Annual emissions from components based on leak surveys and leaker factors Indicate if the facility used the alternate method (company based EF) No Annual CH4 Emissions from fugitive sources Centrifugal Compressors (Transmission) Number of centrifugal compressors with wet seals Yes Annual CH4 emissions vented to the atmosphere Number of centrifugal compressors with dry seals Yes Count of compressors using the alternate method No Count of manifolded groups Yes Count of routed to flare Yes of routed to vapor recovery Yes Count of compressors using the alternate method Annual CH4 Emissions Centrifugal Compressors (Storage) Number of centrifugal compressors with wet seals Yes Annual CH4 emissions vented to the atmosphere Number of centrifugal compressors with dry seals Yes Count of compressors using the alternate method No of manifolded groups Yes of routed to flare Yes Count of routed to vapor recovery Yes Count of compressors using the alternate method Annual CH4 Emissions Reciprocating Compressors (Transmission) Count of compressor vented rod packing Yes Annual CH4 emissions vented to the atmosphere from isolation valves, blowdown valves, and rod packing (including estimated fraction of CH4 from manifolded compressor sources) Count of compressor rod packing w/ flare or captured of compressor isolation valves w/control Count of compressors blowdown valves w/control Count of manifolded groups of compressors using the alternate method Annual CH4 Emissions Reciprocating Compressors (Storage) Count of compressor vented rod packing Yes Count of compressor rod packing w/ flare or captured Count of compressor isolation valves w/control Count of compressors blowdown valves w/control
Mishaps (Dig-ins, Pipeline Damages) Miles of pipe No Annual CH4 Emissions (Applies GHGI emission factor) Combustion Sources Internal and External combustion sources Actual count of external fuel combustion units with a rated heat capacity ≤ 5 MMBtu/hr PLUS internal fuel combustion units that are not with a rated heat capacity to ≤ 1 MMBtu/hr Yes Large Internal Combustion Sources Actual count of internal fuel combustion units that are not compressor-drivers, with a rated heat capacity >1 million Btu per hour Yes Annual CH4 Emissions for internal fuel combustion units that are not with a rated heat capacity greater than 1 million Btu per hour Actual of internal fuel combustion units of any heat capacity that are compressor-drivers Yes Annual CH4 Emissions for internal fuel combustion units of any heat capacity that are compressor-drivers Large External Combustion Sources Actual count of external fuel combustion units with a rated heat capacity > 5 million Btu per hour Yes Annual CH4 Emissions for external fuel combustion units with a rated heat capacity greater than 5 million Btu per hour