3.3 Sedimentation
Clasification Society 2024 - Version 9.40
Statutory Documents - IMO Publications and Documents - Circulars - Maritime Safety Committee - MSC/Circular.798 – Guidelines for Performance and Testing Criteria and Surveys of Medium-Expansion Concentrates for Fire-Extinguishing Systems – (Adopted on 9 June 1997) - Annex - Guidelines for Performance and Testing Criteria and Surveys of Medium-Expansion Foam Concentrates for 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 3.3.2.

  3.3.2 The test should be carried out as follows:

  • .1 Apparatus:

    • .1 graduated centrifuge tubes;

    • .2 centrifuge operating at 6000 + 100 m/s2;

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

    • .4 plastic wash bottle.

    • NOTE: A centrifuge and tubes complying with ISO 3734 are suitable.

  • .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
Copyright 2022 Clasifications Register Group Limited, International Maritime Organization, International Labour Organization or Maritime and Coastguard Agency. All rights reserved. Clasifications Register Group Limited, its affiliates and subsidiaries and their respective officers, employees or agents are, individually and collectively, referred to in this clause as 'Clasifications Register'. Clasifications Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Clasifications Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract.