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Q330. If a natural gas common pipe is connected to a series of small combustion units and a subpart D unit, how should emissions be reported?

Disclaimer This information is intended to provide general and administrative information about 40 CFR Part 98. It does not represent legal advice. This information does not have legally binding effect or expressly or implicitly create, expand, or limit any legal rights, obligations, responsibilities, expectations, or benefits in regard to any person. Facility owners or operators and suppliers are responsible for determining how they would be affected by the requirements of 40 CFR Part 98.

Q330. If a natural gas common pipe is connected to a series of small combustion units and a subpart D unit, how should emissions be reported?

As described in 40 CFR 98.36(c)(3), the common pipe reporting configuration may be used for the small combustion units. If a portion of the fuel serving a common pipe is diverted to a flare, another stationary fuel combustion unit (or units), a chemical or industrial process, or a Part 75 unit (Subpart D or 98.33(a)(5)), company records may be used to subtract out the diverted fuel stream from the fuel served to the units in the common pipe configuration. The emission reporting for the subpart D unit would be unaffected by how the emissions are calculated for the common pipe configuration.
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