3.3 Sedimentation
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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 - 3 Tests for Type Approval of Foam Concentrates - 3.3 Sedimentation

3.3 Sedimentation

  3.3.1 Any sediment in the concentrate prepared in accordance with section 2 should be dispersible through a 180 μm sieve, and the percentage volume of sediment should not be more than 0.25% when tested in accordance with paragraph 3.3.2 below.

  3.3.2 The test should be carried out as follows:

  • .1 apparatus:

    • .1 graduated centrifuge tubes;

    • .2 centrifuge operating at 6,000 ± 100 m/s2;

    • .3 180 μm sieve complying with standard ISO 3310-1; and

    • .4 plastic wash bottle.

    • Note: a centrifuge and tubes complying with standard ISO 3734 are suitable; and

  • .2 procedure: centrifuge each sample for 10 min. Determine the volume of the sediment and determine the percentage of this volume with respect to the centrifuged sample volume. Wash the contents of the centrifuge tube onto the sieve and check that the sediment can or cannot be dispersed through the sieve by the jet from the plastic wash bottle.

  • Note: It is possible that the test method is not suitable for some non-Newtonian foam concentrates. In this case an alternative method, to the satisfaction of the Administration, should be used so that compliance with this requirement can be verified.

Parent topic: 3 Tests for Type Approval of Foam Concentrates
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