10 Determination of Foam Properties
Clasification Society 2024 - Version 9.40
Statutory Documents - IMO Publications and Documents - Circulars - Maritime Safety Committee - MSC.1/Circular.1384 – Guidelines for the Testing and Approval of Fixed High-Expansion Foam Systems – (10 December 2010) - Annex – Guidelines for the Testing and Approval of Fized High-Expansion Foam Systems - Appendix 4 – Optional Small Scale Test Method for High–Expansion Foam Concentrates to be Used With Inside Air - 10 Determination of Foam Properties

10 Determination of Foam Properties

Parent topic: Appendix 4 – Optional Small Scale Test Method for High–Expansion Foam Concentrates to be Used With Inside Air

10.1 Principle

 For the determination of the foam properties, it is essential that all foam and any possible unexpanded premix is collected.

10.2 Foam expansion ratio and drainage time at ambient conditions

  10.2.1 The expansion ratio and drainage time should be measured in accordance with standards ISO 7203-2, annex F, or EN 1568-2, annex G, with the deviation that the foam generator is replaced by the foam generator as described within this document.

  10.2.2 The expansion ratio and drainage time should be measured both with fresh and with simulated seawater specified in standards ISO 7203-2, annex F, and EN 1568-2, annex G.

10.3 Foam expansion as a function of temperature

  10.3.1 The foam expansion should be measured by collecting the foam in the foam collector vessel during 20 s, or until it is full. Record the volume of the collected foam, or the filling time. Calculate the foam expansion ratio:

where:

  • V is the volume of the collected foam;

  • Q is the premix flow rate from the foam generator; and

  • t is the time for collecting the foam.

Note If the foam expansion is high (> 508) the vessel will be full before the 20 s has elapsed. In these cases, the time should be recorded when the vessel is full.

  10.3.2 The expansion ratio at each temperature should be measured with both freshwater and simulated seawater specified in standards ISO 7203-2, annex F, and EN 1568-2, annex G.

  10.3.3 The results should be presented in diagrams with expansion ratio as a function of temperature.

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