Circular
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Circular

  1 The Maritime Safety Committee, at its eighty-sixth session (27 May to 5 June 2009), noting that the provisions in paragraphs 1.2.3 and 4.1.4 of the Revised standards for the design, testing and location of devices to prevent the passage of flame into cargo tanks in tankers (MSC/Circ.677), needed clarification to ensure that the maximum experimental safe gap (MESG) value for the medium to be used to test the device is appropriate for the product certified to be carried in the tank fitted with such a device, approved the following amendments to MSC/Circ.677:

  • .1 Paragraph 1.2.3 is replaced with the following:

  • “1.2.3 These Standards are intended for devices protecting cargo tanks containing crude oil, petroleum products and flammable chemicals. In the case of the carriage of chemicals, the test media referred to in section 3 can be used for products having an MESG of 0.9 mm and greater. However, devices for chemical tankers certified for the carriage of products with an MESGfootnote less than 0.9 mm should be tested with the following media based on the apparatus group assigned as per column i″ of the IBC Code, chapter 17:

    • .1 Apparatus Group II B – ethylene (MESG = 0.65 mm); and

    • .2 Apparatus Group II C – hydrogen (MESG = 0.28 mm).”

  2 Member Governments are invited to apply the above amendments to the Revised standards, as promulgated by MSC/Circ.1324, to ships constructed on or after 1 January 2013 and to ships constructed before 1 January 2013, no later than the first scheduled dry-docking carried out on or after 1 January 2013.

  3 Attention is drawn to the fact that information on apparatus groups in column i″ is missing in relation to a large number of products listed in chapter 17 of the IBC Code, as set out in annex 1. In order to allow sufficient time for the ESPH Working Group to receive and review the aforementioned missing information and to prepare corresponding amendments to the IBC Code, missing data needed to determine the electrical apparatus group should be sent to IMO, in the format specified in annex 2, no later than 31 December 2010.

  4 Member Governments are invited to bring this circular to the attention of the parties concerned.

Parent topic: MSC.1/Circular.1325 – Missing Information on Apparatus Groups in Column i” of Chapter 17 of the IBC Code – (10 June 2009)
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