1.2 Definitions
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Statutory Documents - IMO Publications and Documents - Circulars - Maritime Safety Committee - MSC.1/Circular.1312 – Revised Guidelines for the Performance and Testing Criteria, and Surveys of Foam Concentrates for Fixed Fire-Extinguishing Systems – (10 June 2009) - Annex – Revised Guidelines for the Performance and Testing Criteria, and Surveys of Foam Concentrates for Fixed Fire-Extinguishing Systems - 1 General - 1.2 Definitions

1.2 Definitions

 For the purpose of these Guidelines, the following definitions apply:

  1.2.1 Foam (fire fighting) is an aggregate of air filled bubbles formed from an aqueous solution of suitable foam concentrate.

  1.2.2 Foam solution is a solution of foam concentrate and water.

  1.2.3 Foam concentrate is a liquid which, when mixed with water in the appropriate concentration, gives a foam solution.

  1.2.4 Expansion ratio is the ratio of the volume of foam to the volume of foam solution from which it was made.

  1.2.5 Spreading coefficient is a measurement of the ability of one liquid to spontaneously spread across another.

  1.2.6 25% (50%) drainage time is the time for 25% (50%) of the liquid content of a foam to drain out.

  1.2.7 Gentle application is the application of foam to the surface of a liquid fuel via a backboard, tank wall or surface.

  1.2.8 Sediment is insoluble particles in the foam concentrate.

  1.2.9 Aqueous film-forming foam concentrate (AFF) is a foam concentrate based on a mixture of hydrocarbon and fluorinated surface active agents.

  1.2.10 Alcohol–resistant foam concentrate (AR) is a foam concentrate that is resistant to breakdown when applied to the surface of alcohol or other polar solvents.

  1.2.11 Film-forming fluoroprotein foam concentrate (FFFP) is a foam concentrate which has the ability to form an aqueous film on the surface of some hydrocarbons.

  1.2.12 Fluoroprotein foam concentrate (FP) is a protein foam concentrate with added fluorinated surface active agents.

  1.2.13 Protein foam concentrate (P) is a foam concentrate made from hydrolyzed protein materials.

  1.2.14 Synthetic foam concentrate (S) is a foam concentrate based on a mixture of hydrocarbon surface active agents and which may contain fluorocarbons with additional stabilizers.

  1.2.15 Type A foam concentrates are alcohol-resistant or multi-purpose foam concentrates.

  1.2.16 Type B foam concentrates are all regular type foam concentrates that are not alcohol-resistant, including fluoroprotein and aqueous film-forming (AFF) foam concentrates.

Parent topic: 1 General
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