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Common Mistakes. by Carrie Schroeder. Emission Factors. Where did they come from? How old are they? If you changed it in your spreadsheet, make sure to change it in Redbud Document where you got the emission factor. Control Efficiencies.

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common mistakes

Common Mistakes

by Carrie Schroeder

emission factors
Emission Factors

Where did they come from?

How old are they?

If you changed it in your spreadsheet, make sure to change it in Redbud

Document where you got the emission factor

control efficiencies
Control Efficiencies

Is yours included in the emission factor you’re using?

Then don’t forget to check the box!

controls
Controls
  • Listing controls and efficiencies that do not apply to that pollutant
    • Fabric filters and baghouses only control PM
    • Catalytic converters control CO, VOCs and/or NOx
    • Catalytic oxidizers control CO and VOCs
units
Units
  • Double check that the units in Redbud are still accurate
  • Check:
    • process rate units
    • emission factor units
  • We can’t replicate your emissions if the units are incorrect
hazardous air pollutants haps
Hazardous Air Pollutants (HAPs)

Are they in your VOCs?

Speciate your HAPs out of your VOCs

We especially saw this error on compressor engines

stack parameters
Stack Parameters
  • If flow rate = 0 then list the unit as a fugitive
  • Cannot replicate flow rate and gas exit velocity calculation
stack parameters1
Stack parameters

Equation:

Gas Exit Velocity = flow rate (acfm) ÷

(∏ x r2 x 60)

OR

Flow rate (acfm) = exit gas velocity x

(∏ x r2 x 60)

acfm= actual cubic feet per minute

For non-round stacks

Diameter = 1.128 x √(length x width)

reporting not reporting
Reporting/Not Reporting

Emissions reported but have 0 for process rate and/or 0 for annual hours

OR

Process rate reported and/or annual hours reported but emissions are 0 and trace boxes are not checked

reporting same values
Reporting Same Values
  • If you have the same annual process rate, annual hours, and emissions for 2 years in a row then you will get flagged in our QC program
    • Usually incorrect, so please don’t just re-enter last years data
    • Some correct situations might be emergency generators, fire pumps, and process tank heaters
inconsistent increase decrease in emissions
Inconsistent Increase/Decrease in Emissions
  • You will get flagged if:
    • Annual process rate and hours vary slightly from previous year to current year, but emissions decrease or increase greatly
    • And calculation method, controls, emission factor, and emission factor units have not changed
  • If you legitimately fall into this situation then please make an emission unit note explaining why
why your inventory is important
Why Your Inventory Is Important
  • Missing or incorrect release point data lead to errors in geographical location of emissions and impacts photochemical modeling and health risk assessments
  • Missing or incorrect hours and season fractions lead to errors in temporal distribution of emissions
  • Errors in SCC and SIC impact control strategy development and attainment plans
  • Missing or incorrect control equipment data impacts rule development
  • Good data leads to effective air quality regulation