Method for fighting fire in confined areas using nitrogen expanded foam

  • US 7,104,336 B2
  • Filed: 09/15/2004
  • Issued: 09/12/2006
  • Est. Priority Date: 07/25/2002
  • Status: Expired due to Fees
First Claim
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1. A method for extinguishing a fire comprising the steps of:

  • a. proportioning foam concentrate into a non-inflammable liquid to form a foam concentrate/liquid mixture;

    b. forming a flowing stream of said foam concentrate/liquid mixture;

    c. chilling nitrogen gas to a temperature below about 70°

    F.;

    d. mixing said nitrogen and said stream of said foam/liquid mixture to initiate the formation of a nitrogen expanded foam chilled fire suppressant; and

    e. dispensing said flowing stream carrying said chilled nitrogen expanded foam to effect the full expansion of said chilled nitrogen expanded foam and to introduce said chilled nitrogen expanded foam to an area involved in fire thereby to lower the temperature at the surface of combustible material at said area and to smother said fire.

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