Valves

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Connectors

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Pump seals

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Open-ended lines

—

PRVs

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Other (sample/instrument)

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Gas CH₄ fraction

Gas price

$/mscf

GWP CH₄

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LDAR credit (if program in place)

Component-count fugitive inventories: EPA AP-42 §5.3 emission factors, the heavy-tailed leak distribution, and LDAR credit application.

Default factors are gas-service per EPA AP-42 §5.3 and Subpart W §98.232.
For Subpart W reporting, prefer measured emission rates over default factors.
LDAR credit reflects observed reduction from quarterly OGI surveys (typical 60-80%).
Standards: EPA AP-42 §5.3, EPA Subpart W §98.232, API Compendium, OGMP 2.0.

Fugitive Emissions from Component Count

Fugitive Inventory