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Early implementation of draft amendments to the IMSC Code

Iron-ore Lloyd's Register has issued a Statutory Alert regarding the early implementation of draft amendments to the IMSBC Code. These amendments are under development by the Carriage of Containers and Cargoes (CCC) Sub- Committee (formely the DSC Sub-Committee) and include the following:

a draft individual schedule for iron ore fines (group A) which addresses the dangers relating to liquefaction a revised individual schedule for iron ore (group C) a new draft test procedure - "Modified Proctor/ Fagerberg test procedure for iron ore fines" - for inclusion in appendix 2 to the IMSBC Code.

 

According to the relevant IMO Circular, taking into account that the mandatory entry into force date of these amendments would be 1 January 2017, the IMO Sub-Committee agreed to invite SOLAS Contracting Governments to voluntarily implement the draft schedules and test procedure as soon as possible.

1. DRAFT INDIVIDUAL SCHEDULE FOR IRON ORE FINES

This schedule applies to iron ore cargoes containing both 10% or more of fine particles less than 1 mm and 50% or more of particles less than 10 mm. Iron ore fines where the total goethite content is 35% or more by mass may be carried in accordance with the individual schedule for "IRON ORE", provided the master receives from the shipper a declaration of the goethite content of the cargo which has been determined according to internationally or nationally accepted standard procedures.

Hazards

This cargo may liquefy if shipped at moisture content in excess of its transportable moisture limit (TML) This cargo may affect magnetic compasses. This cargo is non-combustible or has a low fire risk.

Weather precautions

the moisture content of the cargo shall be kept less than its TML during loading operations and the voyage; unless expressly provided otherwise in this individual schedule, the cargo shall not be handled during precipitation; unless expressly provided otherwise in this individual schedule, during handling of the cargo, all non-working hatches of the cargo spaces into which the cargo is loaded or to be loaded shall be closed; the cargo may be handled during precipitation under the conditions stated in the procedures required in subsection 4.3.3 of this Code; and the cargo in a cargo space may be discharged during precipitation provided that the total amount of the cargo in the cargo space is to be discharged in the port

Loading

Trim in accordance with the relevant provisions required under sections 4 and 5 of the Code. As the density of the cargo is high, due consideration shall be given to ensure that tanktop is not overstressed during voyage and during loading by a pile of the cargo.

Precautions

Loading rates of this cargo are normally very high. Due consideration shall be given to the ballasting operation in developing the loading plan required by SOLAS regulation VI/7.3. Bilge wells shall be clean, dry and protected as appropriate to prevent ingress of the cargo.

Carriage

Cargo hold bilges shall be sounded at regular intervals and pumped out, as necessary. The appearance of the surface of this cargo shall be checked regularly during voyage, as far as practicable. If free water above the cargo or fluid state of the cargo is observed during voyage, the master shall take appropriate actions to prevent cargo shifting and potential capsize of the ship, and give consideration to seeking emergency entry into a place of refuge.

 

2. DRAFT REVISED INDIVIDUAL SCHEDULE FOR IRON ORE

This schedule applies to iron ore cargoes containing either less than 10% of fine particles less than 1 mm or less than 50% of particles less than 10 mm or both. Also iron ore fines where the total goethite content is 35% or more by mass, provided the master receives from the shipper a declaration of the goethite content of the cargo which has been determined according to internationally or nationally accepted standard procedures.

Hazards

No special hazards. This cargo is non-combustible or has a low fire risk. Iron ore cargoes may affect magnetic compasses.

Loading

Trim in accordance with the relevant provisions required under sections 4 and 5 of the Code. As the density of the cargo is extremely high, the tanktop may be overstressed unless the cargo is evenly spread across the tanktop to equalize the weight distribution. Due consideration shall be paid to ensure that tanktop is not overstressed during voyage and during loading by a pile of the cargo.

Precautions

Loading rates of this cargo are normally very high. Due consideration shall be given to the ballasting operation to develop the loading plan required by SOLAS regulation VI/7.3. Bilge wells shall be clean, dry and protected as appropriate to prevent ingress of the cargo.

 

3. DRAFT NEW TEST PROCEDURE FOR DETERMINING TML OF IRON ORE FINES

The test procedure specified in this test should only be used for determining transportable moisture limit (TML) of Iron Ore Fines.

Iron Ore Fines is iron ore containing both:

10% or more of fine particles less than 1 mm, and 50% or more of particles less than 10 mm. The TML of Iron Ore Fines is taken as equal to the critical moisture content at 80% degree of saturation according to the modified Proctor/Fagerberg method test. The test procedure is applicable when the degree of saturation corresponding to Optimum Moisture Content (OMC) is 90% or higher.

Procedure - Establishment of a complete compaction curve

A representative sample according to a relevant standard ( section 4.7 of the IMSBC Code) of the test material is partially dried at a temperature of approximately 60 C or less to reduce the samples moisture to suitable starting moisture, if needed. The representative sample for this test should not be fully dried, except in case of moisture content measurement.

The total quantity of the test material should be at least three times as big as required for the complete test sequence. Compaction tests are executed for five to ten different moisture contents (five to ten separate tests). The samples are adjusted in order that partially dry to almost saturated samples are obtained. The required quantity per compaction test is about 2,000 cm3.

 

Compaction-cylinder-and-compaction-hammer

At each compaction test a suitable amount of water is added to the sample of the test material. The sample material is gently mixed before being allowed to rest and equilibrate. Approximately one fifth of the mixed sample is filled into the mould and levelled and then the increment is tamped uniformly over the surface of the increment. Tamping is executed by dropping a 150 g hammer 25 times through the guide pipe, 0.15 m each time. The performance is repeated for all five layers. When the last layer has been tamped, the extension piece is removed and the sample is levelled off along the brim of the mould with care, ensuring to remove any large particles that may hinder levelling of the sample, replacing them with material contained in the extension piece and re-levelling. When the weight of the cylinder with the tamped sample has been determined, the cylinder is emptied, the sample is dried at 105ΊC and the weight is determined. Reference is made to ISO 3087:2011 "Iron ores -- Determination of the moisture content of a lot". The test then is repeated for the other samples with different moisture conten

For further information on the voluntary implementation of the Code, please read the IMO Circular DSC.1/Circ.71