Direct Reduced Iron (d) (By-Product Fines With Moisture Content Of At Least 2%)
DIRECT REDUCED IRON (D) (By-product fines with moisture content of at least 2%)
Schedule source MSC.539(107), Annex 9, Appendix 1, IMSBC Code Amendment 07-23 · pages 197, 198, 199, 200, 201
Description
Direct reduced iron (DRI) (D) is a porous, black/grey odourless metallic material generated as a by-product of the manufacturing and handling processes of DRI (A) hot-moulded briquettes and/or DRI (B) lumps, pellets and cold-moulded briquettes, which has been aged for at least 30 days prior to loading.
Hazard
Temporary increase in temperature of about 30°C over ambient, due to oxidation and consequent self-heating, may be expected after material handling in bulk. There is a risk of overheating, fire and explosion during transport due to the fact that this cargo reacts with air, fresh water and seawater to produce hydrogen and heat. Hydrogen is a lighter than air, flammable gas, that can form an explosive atmosphere when mixed with air in concentrations above 4% by volume. Oxygen in cargo holds and in enclosed adjacent spaces may be depleted. Flammable gas may also build up in these spaces. This cargo may liquefy if shipped at a moisture content in excess of its transportable moisture limit (TML). See sections 7 and 8 of IMSBC Code.
Stowage and Segregation
“Separated from” goods of classes 1 (division 1.4S), 2, 3, 4 and 5, and class 8 acids in packaged form (see the IMDG Code). “Separated from” solid bulk materials of classes 4 and 5. Goods of class 1, other than division 1.4S, shall not be carried in the same ship. Boundaries of compartments where this cargo is carried shall be resistant to fire and passage of liquid.
Hold Cleanliness
The cargo spaces shall be clean, dry and free of salt and residues of previous cargoes. Prior to loading, wooden fixtures such as battens, loose dunnage, debris and combustible materials shall be removed.
Weather Precautions
Storage in the open air shall be permitted prior to loading, subject to any requirements of the competent authority of the port of loading. During storage, the material shall be piled such as to allow the greatest possible exposure to the atmosphere and thus facilitate its natural ageing. When a cargo is carried in a ship other than a ship complying with the requirements in 7.3.2 of this Code, the following provisions shall be complied with: .1 the moisture content of the cargo shall be kept less than its TML during loading operations and the voyage; .2 unless expressly provided otherwise in this individual schedule, the cargo shall not be handled during precipitation; .3 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; and .4 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
Prior to loading this cargo, the shipper shall provide the master with a certificate issued by a competent person recognized by the competent authority of the port of loading stating that the cargo does not meet the criteria for class 4.2 materials. As the density of the cargo is extremely high, the tank top may be overstressed unless the cargo is evenly spread across the tank top to equalize the weight distribution. Due consideration shall be given to ensure that the tank top is not overstressed during the voyage and during loading by a pile of the cargo. Prior to loading, the cargo shall be prepared and aged naturally for a minimum of 30 days. Prior to loading this cargo, the shipper shall provide the master of the ship with a certificate issued by a competent person recognized by the competent authority of the port of loading stating that the cargo has been prepared and aged naturally for a minimum of 30 days. Prior to loading, the temperature of the cargo in the stockpile to be loaded shall be measured by the shipper for three consecutive days and recorded in a log. Measurements shall be taken 20 to 30 cm below the surface and at 3-metre intervals over the length and width of the stockpile. The cargo shall not be loaded if its temperature is in excess of 65°C. Care shall be taken by all parties concerned to ensure that particles coarser than 6.35 mm are, as far as is practicable, evenly distributed throughout the entire cargo, in order to avoid build-up of concentrations of coarse material. Trim in accordance with the relevant provisions required under sections 4 and 5 of IMSBC Code. The cargo temperature shall be monitored during loading and recorded in a log detailing the temperature of each lot of cargo loaded, a copy of which shall be provided to the master. Hatch covers shall, weather permitting and subject to the absence of precipitation, remain open after completion of loading of the respective holds and placement of thermocouples, in order to allow cooling of the cargo, stabilization of cargo temperature and natural ventilation of the hold. Otherwise, hatches shall be closed and sealed immediately upon completion of loading and placement of thermocouples. Monitoring of temperature and hydrogen concentration shall then be commenced.
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