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4 - PERIODICAL CONTROLS OF FOAM CONCENTRATES STORED ON BOARD
The attention of the Administration is drawn to the fact that particular installation conditions (excessive ambient temperature, incomplete filling of the tank etc.) may lead to an abnormal aging of the concentrates.
For the periodical control of foam concentrate the rests under paragraphs 4.1 - 4.5 should be performed. They should be carried out at laboratories acceptable to the Administration.
The deviations in the values obtained by these tests, in respect of those obtained during the type approval tests, should be within ranges acceptable to the Administration.
Tests under items 4.1, 4.3 and 4.4 should be carried out on samples maintained at 60℃ for 24 hours and subsequently cooled to the test temperature.
4.1 - Sedimentation
According to paragraph 3.3 above.
4.2 - pH value
According to paragraph 3.5 above.
4.3 - Expansion ratio
According to paragraph 3.7 above.
4.4 - Drainage time
According to paragraph 3.8 above.
4.5 - Volumic mass
According to paragraph 3.11 above.
5 - INTERVALS OF PERIODICAL CONTROLS
The first periodical control of foam concentrates stored on board should be performed after a period of 3 years and, after that, every year.
A record of the age of the foam concentrates and of subsequent controls should be kept on board.
Figure 1
Figure 2
Figure 3
Figure 4
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