MSC 85/26/Add.2 ANNEX 3 RESOLUTION MSC.268(85) - US Coast ...
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MSC 85/26/Add.2 ANNEX 3 RESOLUTION MSC.268(85) - US Coast ...

MSC 85/26/Add.2 ANNEX 3 RESOLUTION MSC.268(85) - US Coast ... MSC 85/26/Add.2 ANNEX 3 RESOLUTION MSC.268(85) - US Coast ...

navcen.uscg.gov
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12.07.2015 Views

MSC 85/26/Add.2ANNEX 3Page 104.4 the time the gas analyses were taken (monitoring routine);.5 the quantity of the cargo in the cargo space(s) involved;.6 the description of the cargo as per the shipper’s declaration, and anyspecial precautions indicated on the declaration;.7 the date of loading, and Estimated Time of Arrival (ETA) at the intendeddischarge port (which shall be specified); and.8 any other comments or observations the master may consider relevant.DISCHARGEPrior to, and during, discharge:1. The cargo space shall be kept closed until just before the commencement of discharge ofthat space. The cargo may be sprayed with a fine water spray to reduce dust.2. Personnel shall not enter the cargo space without having tested the atmosphere above thecargo. The personnel entering into a cargo space in which the atmosphere containsoxygen levels below 21% shall wear self-contained breathing apparatus. Carbon dioxideand carbon monoxide gas levels shall also be tested prior to entry into the cargo spaces.The recommended threshold limit value (TLV) for carbon monoxide is 50 ppm.3. During discharge, attention shall be paid to the cargo for signs of hot spots(i.e. steaming). If a hot spot is detected, the area shall be sprayed with fine water sprayand the hot spot shall be removed immediately to prevent spreading. The hot spot cargoshall be spread out on the wharf away from the remainder of the cargo.4. Prior to suspending the discharge of this cargo for more than eight hours, the hatch coversand all other ventilation for the cargo space shall be closed.1 ObservationsPROCEDURES FOR GAS MONITORING OFBROWN COAL BRIQUETTE CARGOES1.1 Carbon monoxide monitoring, when conducted in accordance with the followingprocedures, will provide a reliable early indication of self-heating within this cargo. This allowspreventive action to be considered without delay. A sudden rapid rise in carbon monoxidedetected within a cargo space, particularly if accompanied by an increase in methane levels, is aconclusive indication that self-heating is taking place.1.2 All vessels engaged in the carriage of this cargo shall carry on board an instrument formeasuring methane, oxygen and carbon monoxide gas concentrations, to enable the monitoringof the atmosphere within the cargo space. This instrument shall be regularly serviced andcalibrated in accordance with the manufacturer’s instructions. Care shall be exercised ininterpreting methane measurements carried out in the low oxygen concentrations often found inunventilated cargo holds. The catalytic sensors normally used for the detection of methane relyon the presence of sufficient oxygen for accurate measurement. This phenomenon does notaffect the measurement of carbon monoxide, or measurement of methane by infrared sensor.Further guidance may be obtained from the instrument manufacturer.I:\MSC\85\26-Add-2.doc

MSC 85/26/Add.2ANNEX 3Page 1052 Sampling and measurement procedure2.1 Equipment2.1.1 An instrument which is capable of measuring methane, oxygen and carbon monoxideconcentrations shall be provided on board a ship carrying this cargo. The instrument shall befitted with an aspirator, flexible connection and a length of spark-proof metal tubing to enable arepresentative sample to be obtained from within the square of the hatch.2.1.2 When recommended by the manufacturer, a suitable filter shall be used to protect theinstrument against the ingress of moisture. The presence of even a small amount of water willcompromise the accuracy of the measurement.2.2 Siting of sampling points2.2.1 In order to obtain meaningful information about the behaviour of this cargo in a cargospace, gas measurements shall be made via one sample point per cargo space. To ensureflexibility of measurement in adverse weather, however, two sample points shall be provided percargo space, one on the port side and one on the starboard side of the hatch cover or hatchcoaming (refer to diagram of gas sampling point). Measurement from either of these locations issatisfactory.I:\MSC\85\26-Add-2.docDiagram of gas sampling point2.2.2 Each sample point shall comprise a hole of diameter approximately 12 mm positioned asnear to the top of the hatch coaming as possible. It shall be sealed with a sealing cap to preventingress of water and air. It is essential this cap be securely replaced after each measurement tomaintain a tight seal.

<strong>MSC</strong> <strong>85</strong>/<strong>26</strong>/<strong>Add.2</strong><strong>ANNEX</strong> 3Page 1052 Sampling and measurement procedure2.1 Equipment2.1.1 An instrument which is capable of measuring methane, oxygen and carbon monoxideconcentrations shall be provided on board a ship carrying this cargo. The instrument shall befitted with an aspirator, flexible connection and a length of spark-proof metal tubing to enable arepresentative sample to be obtained from within the square of the hatch.2.1.2 When recommended by the manufacturer, a suitable filter shall be used to protect theinstrument against the ingress of moisture. The presence of even a small amount of water willcompromise the accuracy of the measurement.2.2 Siting of sampling points2.2.1 In order to obtain meaningful information about the behaviour of this cargo in a cargospace, gas measurements shall be made via one sample point per cargo space. To ensureflexibility of measurement in adverse weather, however, two sample points shall be provided percargo space, one on the port side and one on the starboard side of the hatch cover or hatchcoaming (refer to diagram of gas sampling point). Measurement from either of these locations issatisfactory.I:\<strong>MSC</strong>\<strong>85</strong>\<strong>26</strong>-Add-2.docDiagram of gas sampling point2.2.2 Each sample point shall comprise a hole of diameter approximately 12 mm positioned asnear to the top of the hatch coaming as possible. It shall be sealed with a sealing cap to preventingress of water and air. It is essential this cap be securely replaced after each measurement tomaintain a tight seal.

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