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EFTCO Guideline: CO2 emission calculation for tank cleaning.

 

1) Introduction.

The European authorities asked the chemical industry to calculate the CO2 emissions of the logistic services they uses. The transport service is important in these emissions, but also tank cleaning is a part of the logistic service. For this reason an emission section is integrated in the SQAS 2022 Tank cleaning questionnaire.
EFTCO prepared this guideline to help the tank cleaning stations with the calculation of these emissions to make sure this is done in a correct way. The purpose of these calculations is to make the sector aware of their CO2 emissions, to motivate them to reduces them and to show the result to the (interested) customers and/ or the public.

 

2) Terminology used.

Some terminology was originally created for the transport sector, but to keep the comparison between the logistics sectors the same terms are also used for our sector:

  • Well To Tank (WTT)
    the CO2 emission of the energy between the well and the tank of a truck. In our sector it is the emission until the energy is arriving in our companies before it is used. WTT is the only CO2 emission for electricity because the consumption of it is not producing more CO2
  • Tank To Wheel (TTW)
    The fuel or gas burned in your installation. This includes the fuel burned for boilers, forklifts, terrain trucks, incinerators, …
  • Well To Wheel (WTW)
    The sum of WTT and TTW
  • Emission intensity:
    In our sector it is the total CO2 emission (WTW) divided by the number of cleaning in the a year
  • Scope 1:
    TTW emissions of fuel or gas burned during your activities related with the cleaning
  • Scope 2:
    WTT emissions of the electricity used during your activities related with the cleaning
  • Scope 3:
    The WTT emissions of the fuel or gas burned from scope 1.
    In the transport sector this is used for the emissions of subcontractors, but because this is rare in our sector. Scope 3 is kept to keep the calculation similar to this from the transport sector
  • Emission intensity:
    The total CO2 emissions divided by the total number of cleanings.
  • GLEC framework :
    Global Logisitcs Emissions Council Framework for Logistics Emissions Accounting and Reporting. This framework contains factors for the calculation of the CO2 emissions of different energies used in different activities and countries. Mainly the WTT emission factor for electricity can differ from country to country depending on the manner the electricity is produced (wind energy, waterpower energy, nuclear energy, cole, gas, …).

3) Example calculation:

 

The example calculation below used the CO2 emission factors published in the Netherlands:

 

CO2 PRODUCTION  FOR ENERGY CONSUMPTION TANK CLEANING

 

WTW

TTW

WTT

Source

 

www.CO2Emissiefactoren.nl

 

 

Electricity
(kg CO2/kWh)

 

0,475

0,475

0

Gas
(kg CO2/Nm³)

 

1,884

1,785

0,099

Gasoline
(kg CO2/l)

 

3,185

2,575

0,61

Propane
(kg CO2/liter)

 

1,725

1,53

0,195

Restheat with co-firing (GJ)

 

21,53

20,63

0,9

         
         

Per tank cleaning

Total Consumption

WTW Production of
CO2 (kg)

TTW Production of
CO2 (kg)

WTT Production of
CO2 (kg)

Number orf tank cleaning

15.000

 

 

 

Electricity (kWh)

719.735

341.874

341.874

0

Gas (Nm³)

385.112

725.551

687.425

38.126

Gasoline (liter)

0

0

0

0

Propane consumption (liter)

0

0

0

0

Restheat with co-firing (GJ)

0

0

0

0

TOTAL for 15000 TANK CLEANINGS (kg CO2e)

 

1.067.425

1.029.299

38.126

TOTAL / TANK CLEANING(kg CO2e)

 

71,16

68,62

2,54

EMISSION INTENSITY  (kg CO2e)

 

71,16

   

 

The emission factors can be different from country to country. Therefore this calculation is not meant to compare countries or individual installations with each other. By repeating this calculation each year, a company can proof It’s effort to reduce it’s CO2 emission intensity by reducing the total energy consumption per cleaning.

 

PS.: the Excel calculation model is available for the members on the EFTCO website.