a representative gas sample drawn from the system, using the method specified in section 95125(d)(3). Small refiners shall determine carbon content weekly.
The operator shall determine high heating value from the fuel sample obtained to conduct carbon analysis, or from continuous on-line instrumentation. When HHVA is derived from on-line instrumentation, operators shall use either an hourly average HHV value coinciding with the hour in which the carbon content determination was made, or the hour in which the sample was collected for analysis. The operator shall use the method specified in section 95125(c)(1)(B). Operators of facilities with installed instrumentation which provides fuel or fuel mixture LHV (Btu/scf) shall use methods specified in section 95125(c)(1)(C) for the conversion of LHV to HHV.
For each refinery fuel gas system the operator shall use the system specific daily (weekly for small refiners) fuel emission factor calculated using the equation in section 95125(e)(3) to calculate daily (weekly for small refiners) CO2 emissions from all combustion devices where the fuel gas from that system was combusted, using the following equation.
365 = ∑ HHVDA 1
FRA * EFCO2-A
= CO2 emissions resulting from the combustion of fuel gas from
system A (metric tonnes/yr) HHVDA = daily average high heating value for system A (Btu/scf) F R A = d a i l y f u e l c o n s u m p t i o n f o r f u e l g a s s y s t e m A ( s c f / d ) CO2-A C = daily CO2 emission factor for fuel gas system A (tonnes EF O 2 / M M B t u ) 0.000001 = conversion factor – Btu to MMBtu
The operator shall determine the daily average high heating value (HHVDA) from continuous on-line instrumentation (except for small refiners). Small refiners may use the HHV value determined as part of the weekly fuel carbon content analysis to calculate weekly CO2 emissions.
The operator shall calculate and report total CO2 emissions resulting from the combustion of fuel gas as the sum of CO2 combustion emissions from each fuel gas system in the following manner: