Definition(s)
Nominal Foam Expansion Ratio
Nominal foam expansion ratio is the ratio of the volume of foam to the volume of foam solution from which it was made.
Source: IMO MSC.1/Circ.1271, Guidelines for the approval of high-expansion foam using inside air for the protection of machinery spaces and cargo pump-rooms, 4 June 2008, International Maritime Organization. Regulatory Guidance
Nominal Foam Expansion Ratio
Nominal foam expansion ratio is the ratio of the volume of foam to the volume of foam solution from which it was made, under non-fire conditions, and at an ambient temperature of e.g. around 20ºC. <fixed foam fire-extinguishing systems>.
Source: IMO Resolution MSC.327(90), amendments to the International Code for Fire Safety Systems, 25 May 2012, International Maritime Organization. Regulatory Guidance