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Subpart BB—Silicon Carbide Production

Silicon carbide production includes any process that 

produces silicon carbide for abrasive purposes.

§ 98.280 Definition of the source category.

You must report GHG emissions under this subpart if your 

facility contains a silicon carbide production process and the 

facility meets the requirements of either §98.2(a)(1) or (a)(2).

§ 98.281 Reporting threshold.

You must report:

§ 98.282 GHGs to report.

(a) CO2 and CH4

(b) CO

process emissions from all silicon carbide 

process units or furnaces combined.

2, CH4, and N2O emissions from each stationary 

combustion unit. You must report these emissions under subpart C 

of this part (General Stationary Fuel Combustion Sources) by 

following the requirements of subpart C.

You must calculate and report the combined annual process 

CO

§ 98.283 Calculating GHG emissions.

2 emissions from eachall silicon carbide process unit orunits

and production furnacefurnaces using the procedures in either 

paragraph (a) or (b) of this section. You must determine CH4

process emissions in accordance with the procedures specified in 

paragraph (d) of this section.
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(a) Calculate and report under this subpart the combined 

annual process CO2

(b) Calculate and report under this subpart the combined 

annual process CO

emissions by operating and maintaining CEMS 

according to the Tier 4 Calculation Methodology specified in 

§98.33(a)(4) and all associated requirements for Tier 4 in 

subpart C of this part (General Stationary Fuel Combustion 

Sources).

2

(1) Use Equation BB–1 of this section to calculate the 

facility-specific emissions factor for determining CO

emissions using the procedures in paragraphs 

(b)(1) and (b)(2) of this section.

2 emissions. 

The carbon content must be measured monthly and used to 

calculate a monthly CO2 emissions factor:

Where:

EFCO2,n = CO2 emissions factor in month n (metric tons 

CO2

0.65 = Adjustment factor for the amount of carbon in 

silicon carbide product (assuming 35 percent 

of carbon input is in the carbide product).

/metric ton of petroleum coke consumed).

CCFn =

44/12 = Ratio of molecular weights, CO

Carbon content factor for petroleum coke 

consumed in month n from the supplier or as 

measured by the applicable method incorporated 

by reference in §98.7 according to §98.284(c) 

(percent by weight expressed as a decimal 

fraction).

2 to carbon.
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(2) Use Equation BB–2 of this section to calculateCalculate

annual CO2 process emissions from all siliconethe silicon carbide 

production facility according to Equation BB-2 of this section:

Where:

CO2 = Annual CO2 emissions from silicon carbide 

production facility (metric tons CO2

T

).

n =

EFCO

Petroleum coke consumption in calendar month n 

(tons).

2,n = CO2

2000/2205 = Conversion factor to convert tons to metric 

tons.

emissions factor from month n (calculated 

in Equation BB–1 of this section).

n = Number of month.

(c) If GHG emissions from a silicon carbide production 

furnace or process unit are vented through the same stack as any 

combustion unit or process equipment that reports CO2 emissions 

using a CEMS that complies with the Tier 4 Calculation 

Methodology in subpart C of this part (General Stationary Fuel 

Combustion Sources), then the calculation methodology in 

paragraph (b) of this section shall not be used to calculate 

process emissions. The owner or operator shall report under this 

subpart the combined stack emissions according to the Tier 4 

Calculation Methodology in §98.33(a)(4) and all associated 

requirements for Tier 4 in subpart C of this part.
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(d) You must calculate annual process CH4 emissions from all 

silicon carbide production combined using Equation BB–3 of this 

section:

Where:

CH4 = Annual CH4 emissions from silicon carbide 

production facility (metric tons CH4

T

).

n

10.2 = CH

= Petroleum coke consumption in month n (tons).

4 emissions factor (kg CH4

2000/2205 = Conversion factor to convert tons to metric 

tons.

/metric ton coke).

0.001 = Conversion factor from kilograms to metric 

tons.

n = Number of month.

§(d) [Reserved]

(a) You must measure your consumption of petroleum coke 

using plant instruments used for accounting purposes including 

direct measurement weighing the petroleum coke fed into your 

process (by belt scales or a similar device) or through the use 

of purchase records.

§ 98.284 Monitoring and QA/QC requirements.

(b) You must document the procedures used to ensure the 

accuracy of monthly petroleum coke consumption measurements.

(c) For CO2 process emissions, you must determine the 

monthly carbon content of the petroleum coke using reports from 

the supplier. Alternatively, facilities can measure monthly 

Formatted: Font: (Default) Arial, 9 pt
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carbon contents of the petroleum coke using ASTM D3176–89 

(Reapproved 2002) Standard Practice for Ultimate Analysis of 

Coal and Coke (incorporated by reference, see §98.7) and ASTM 

D5373–08 Standard Test Methods for Instrumental Determination of 

Carbon, Hydrogen, and Nitrogen in Laboratory Samples of Coal 

(incorporated by reference, see

(d) For quality assurance and quality control of the 

supplier data, you must conduct an annual measurement of the 

carbon content of the petroleum coke using ASTM D3176–89 and 

ASTM D5373–08 Standard Test Methods for Instrumental 

Determination of Carbon, Hydrogen, and Nitrogen in Laboratory 

Samples of Coal (incorporated by reference, 

§98.7).

see §98.7).

For the petroleum coke input procedure in §98.283(b), a 

complete record of all measured parameters used in the GHG 

emissions calculations is required (

§ 98.285 Procedures for estimating missing data.

e.g.

(a) For each missing value of the monthly carbon content of 

petroleum coke, the substitute data value shall be the 

arithmetic average of the quality-assured values of carbon 

, carbon content values, 

etc.). Therefore, whenever a quality-assured value of a required 

parameter is unavailable, a substitute data value for the 

missing parameter shall be used in the calculations as specified 

in the paragraphs (a) and (b) of this section. You must document 

and keep records of the procedures used for all such estimates.
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contents immediately preceding and immediately following the 

missing data incident. If no quality-assured data on carbon 

contents are available prior to the missing data incident, the 

substitute data value shall be the first quality-assured value 

for carbon contents obtained after the missing data period.

(b) For each missing value of the monthly petroleum coke 

consumption, the substitute data value shall be the best 

available estimate of the petroleum coke consumption based on 

all available process data or information used for accounting 

purposes (such as purchase records).

In addition to the information required by §98.3(c), each 

annual report must contain the information specified in 

paragraphs (a) or (b) of this section, as applicable for each 

silicon carbide production facility.

§ 98.286 Data reporting requirements.

(a) If a CEMS is used to measure process CO2

(1) Annual consumption of petroleum coke (tons).

emissions, you 

must report under this subpart the relevant information required 

for the Tier 4 Calculation Methodology in §98.36 and the 

information listed in this paragraph (a):

(2) Annual production of silicon carbide (tons).

(3) Annual production capacity of silicon carbide (tons).

(b) If a CEMS is not used to measure process CO2 emissions, 

you must report the information listed in this paragraph (b))(1) 
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through (b)(8) of this section for all silicon carbide process 

units or production furnaces combined:

(1) Monthly consumption of petroleum coke (tons).

(2) Annual production of silicon carbide (tons).

(3) Annual production capacity of silicon carbide (tons).

(4) Carbon content factor of petroleum coke from the 

supplier or as measured by the applicable method in §98.284(c) 

for each month (percent by weight expressed as a decimal 

fraction).

(5) Whether carbon content of the petroleum coke is based 

on reports from the supplier or through self measurement using 

applicable ASTM standard method.

(6) CO2 emissions factor calculated for each month (metric 

tons CO2

(7) Sampling analysis results for carbon content of 

consumed petroleum coke as determined for QA/QC of supplier data 

under §98.284(d) (percent by weight expressed as a decimal 

fraction).

/metric ton of petroleum coke consumed).

(8) Number of times in the reporting year that missing data 

procedures were followed to measure the carbon contents of 

petroleum coke (number of months) and petroleum coke consumption 

(number of months).

§ 98.287 Records that must be retained.
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In addition to the records required by §98.3(g), you must 

retain the records specified in paragraphs (a) and (b) of this 

section for each silicon carbide production facility.

(a) If a CEMS is used to measure CO2

(1) Records of all petroleum coke purchases.

emissions, you must 

retain under this subpart the records required for the Tier 4 

Calculation Methodology in §98.37 and the information listed in 

this paragraph (a):

(2) Annual operating hours.

(b) If a CEMS is not used to measure emissions, you must 

retain records for the information listed in this paragraph (b):

(1) Records of all analyses and calculations conducted for 

reported data listed in §98.286(b).

(2) Records of all petroleum coke purchases.

(3) Annual operating hours.

All terms used in this subpart have the same meaning given 

in the Clean Air Act and subpart A of this part.

§ 98.288 Definitions.