---
kind: "section"
citation: "40 C.F.R. § 98.143"
title: "40"
number: "98.143"
heading: "Calculating GHG emissions."
url: "https://uscodex.org/cfr/40/98.143"
---

# §98.143. Calculating GHG emissions.


You must calculate and report the annual process CO2 emissions from each continuous glass melting furnace using the procedure in [paragraphs (a) through (c)](#a..c) of this section.

- (a) For each continuous glass melting furnace that meets the conditions specified in § [98.33(b)(4)(ii)](/cfr/40/98.33.md?p=b-4-ii) or [(iii)](/cfr/40/98.33.md?p=b-4-iii), you must calculate and report under this subpart the combined process and combustion CO2 emissions by operating and maintaining a CEMS to measure CO2 emissions according to the Tier 4 Calculation Methodology specified in [§ 98.33(a)(4)](/cfr/40/98.33.md?p=a-4) and all associated requirements for Tier 4 in [subpart C](/cfr/40/subpartC.md) of this part (General Stationary Fuel Combustion Sources).
- (b) For each continuous glass melting furnace that is not subject to the requirements in [paragraph (a)](#a) of this section, calculate and report the process and combustion CO2 emissions from the glass melting furnace by using either the procedure in [paragraph (b)(1)](#b-1) of this section or the procedure in [paragraph (b)(2)](#b-2) of this section, except as specified in [paragraph (c)](#c) of this section.
  - (1) Calculate and report under this subpart the combined process and combustion CO2 emissions by operating and maintaining a CEMS to measure CO2 emissions according to the Tier 4 Calculation Methodology specified in [§ 98.33(a)(4)](/cfr/40/98.33.md?p=a-4) and all associated requirements for Tier 4 in [subpart C](/cfr/40/subpartC.md) of this part (General Stationary Fuel Combustion Sources).
  - (2) Calculate and report the process and combustion CO2 emissions separately using the procedures specified in [paragraphs (b)(2)(i) through (b)(2)(vi)](#b-2-i..b-2-vi) of this section.
    - (i) For each carbonate-based raw material charged to the furnace, obtain from the supplier of the raw material the carbonate-based mineral mass fraction.
    - (ii) **Determine the quantity of each carbonate-based raw material charged to the furnace.**
    - (iii) Apply the appropriate emission factor for each carbonate-based raw material charged to the furnace, as shown in Table N-1 to this subpart.
    - (iv) **Use Equation N-1 of this section to calculate process mass emissions of CO<I>2</I> for each furnace—**
    - (v) You must calculate the total process CO2 emissions from continuous glass melting furnaces at the facility using Equation N-2 of this section:
    - (vi) Calculate and report under [subpart C](/cfr/40/subpartC.md) of this part (General Stationary Fuel Combustion Sources) the combustion CO2 emissions in the glass furnace according to the applicable requirements in subpart C.
- (c) As an alternative to data provided by the raw material supplier, a value of 1.0 can be used for the mass fraction (MFi) of carbonate-based mineral i in Equation N-1 of this section.

## Notes

### Amendments

[75 FR 74831, Dec. 1, 2010, as amended at 78 FR 71954, Nov. 29, 2013]

### Authority

Authority: 42 U.S.C. 7401-7671q.

### Source

Source: 74 FR 56374, Oct. 30, 2009, unless otherwise noted.

### Amendments

[75 FR 74831, Dec. 1, 2010, as amended at 78 FR 71954, Nov. 29, 2013]