Ammonia Manufacturing
United States
Final Rule: Mandatory Reporting of Greenhouse Gases ^aimrriental Prot9ction
Under the Mandatory Reporting of Greenhouse Gases (GHGs) rule, owners or operators of facilities that
manufacture ammonia (as defined below) must report emissions from ammonia manufacturing processes
and all other source categories located at the facility for which methods are defined in the rule. Owners
or operators are required to collect emission data; calculate GHG emissions; and follow the specified
procedures for quality assurance, missing data, recordkeeping, and reporting.
How Is This Source Category Defined?
The ammonia manufacturing source category consists of process units in which ammonia is produced
either by steam reforming or gasification of a hydrocarbon feedstock.
What GHGs Must Be Reported?
Ammonia manufacturing facilities must report the following emissions:
• Carbon dioxide (CO2) process emissions from each ammonia manufacturing unit.
• CO2, methane (CFQ, and nitrous oxide (N2O) emissions from each stationary combustion unit.
Report these emissions under 40 CFR 98, subpart C (General Stationary Fuel Combustion
Sources) by following the requirements of subpart C.
• CO2 emissions collected and either used on site or transferred off site, following the requirements
of 40 CFR part 98, subpart PP (Suppliers of Carbon Dioxide).
In addition, each facility must report GHG emissions for any other source categories for which calculation
methods are provided in other subparts of the rule.
How Must GHG Emissions Be Calculated?
Calculate and report process CO2 emissions from each ammonia manufacturing process unit by using one
of two methods:
• Installing and operating a continuous emission monitoring system (CEMS) to measure combined
process and combustion CO2 emissions according to the requirements specified in 40 CFR
part 98, subpart C.
• Calculating CO2 process emissions using the equations provided in the rule for solid, liquid, and
gaseous feedstocks and the following measurements:
o Continuous measurement of gaseous or liquid feedstock consumed (using a flow meter).
o Monthly aggregate of solid feedstock consumed (using company records).
o Carbon content and average molecular weight of each feedstock consumed (using reports
from your supplier).
However, if process CO2 emissions from an ammonia manufacturing process unit are emitted through the
same stack as CO2 emissions from a combustion unit or process equipment that uses a CEMS and follows
Tier 4 methodology in subpart C to report CO2 emissions, then the CEMS must be used to measure and
report combined emissions from that stack, instead of using the calculation procedures described above.
A checklist for data that must be monitored is available at:
www.epa.gov/climatechange/emissions/downloads/checklists/ammoniamanufacturing.pdf.
40 CFR 98, subpart G 1 EPA-430-F-09-028R
September 2009
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What Information Must Be Reported?
In addition to the information required by the General Provisions at 40 CFR 98.3(c), owners or operators
of ammonia manufacturing facilities must report the following information:
If a CEMS is used to measure CO2 emissions, report under this subpart the relevant information required
by 40 CFR part 98, subpart C for the Tier 4 Calculation Methodology and the following information:
• Annual quantity of each type of feedstock consumed for ammonia manufacturing (standard cubic
feet [scfj of feedstock or gallons of feedstock or kilograms [kg] of feedstock).
• Method used for determining quantity of feedstock used.
• Total pounds of synthetic fertilizer produced and total nitrogen contained in that fertilizer.
If a CEMS is not used to measure emissions, report the following information for each unit:
• Annual CO2 process emissions (metric tons).
• Monthly quantity of each type of feedstock consumed for ammonia manufacturing (scf of
feedstock or gallons of feedstock or kg of feedstock).
• Method used for determining quantity of monthly feedstock used.
• Whether monthly carbon content for each feedstock is based on reports from the supplier or
analysis of carbon content.
• If monthly carbon content of feedstock is based on analysis, the test method used.
• Sampling analysis results of carbon content of petroleum coke as determined for QA/QC of
supplier data under 98.74(e).
• If a facility uses gaseous feedstock:
o Carbon content of the gaseous feedstock, for month n (kg C per kg of feedstock).
o Molecular weight of the gaseous feedstock (kg/kg-mole).
o Molar volume conversion factor of the gaseous feedstock (scf per kg-mole).
• If a facility uses liquid feedstock, the monthly carbon content of the liquid feedstock (kg C per
gallon of feedstock).
• If a facility uses solid feedstock, the monthly carbon content of the feedstock (kg C per kg of
feedstock).
• Annual CO2 emissions associated with the waste recycle stream for each ammonia process unit
(metric tons).
• Carbon content of the waste recycle stream for each month (kg C per kg of waste recycle stream).
• Volume of the waste recycle stream for each month (scf).
• Method used for analyzing carbon content of waste recycle stream.
• Annual urea production (metric tons) and method used to determine urea production.
• Uses of urea produced, if known.
• Total pounds of synthetic fertilizer produced and total nitrogen contained in that fertilizer.
For More Information
This document is provided solely for informational purposes. It does not provide legal advice, 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. The series of information sheets is
intended to assist reporting facilities/owners in understanding key provisions of the final rule.
Visit EPA's Web site (www.epa.gov/climatechange/emissions/ghgrulemaking.html) for more
information, including the final preamble and rule, additional information sheets on specific industries,
the schedule for training sessions, and other documents and tools. For questions that cannot be answered
through the Web site, please contact us at: ghgmrr(g),epa.gov.
40 CFR 98, subpart G 2 EPA-430-F-09-028R
September 2009
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