Home Information Sharing & Analysis Prevention & Protection Preparedness & Response Research Commerce & Trade Travel Security Immigration
About the Department Open for Business Press Room
Current National Threat Level is elevated

The threat level in the airline sector is High or Orange. Read more.

Homeland Security 5 Year Anniversary 2003 - 2008, One Team, One Mission Securing the Homeland

« Chemical Security

Top Screen Submittal for Fuels (Except Propane): Question 3

3. Is the release-flammable mixture NFPA 4?

  • If Yes, Complete the Top-Screen for the release-flammable mixture by entering the total weight of the mixture. If there is more than one chemical of interest in the release-flammable mixture, the entire weight of the mixture shall be entered next to the chemical of interest with the highest percentage in the mixture in the Top-Screen questionnaire.  Also, enter the weight of any non-release-flammable chemicals of interest above its screening threshold quantity and also the type and total weight of the fuel.
    • Example: 10,000 lbs of 40% hydrogen, 60% methane mixture and 2,000 lbs of diesel.
      You have completed this process.
  • If No, Complete the Top-Screen for the release-flammable mixture by entering the total weight of the release-flammable chemicals of interest. If there is more than one chemical of interest in the release-flammable mixture, the entire weight of the release-flammable chemicals of interest shall be entered next to the chemical of interest with the highest percentage in the mixture in the Top-Screen questionnaire. Also, enter the weight of any non-release-flammable chemicals of interest above its screening threshold quantity and also type and total weight of the fuel.
    • Example: 40,000 lbs of 35% hydrazine, 65% water mixture and 4,000 lbs of diesel.
      You have completed this process.

This page is part of a series of questions to help you if you have fuels
in your facility's possession, and you are trying to determine if you
have to complete a Top-Screen. More information available.

This page was last reviewed/modified on December 10, 2008.