Transport Guidance for Steel Cargoes
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| 5.3 The stowage plan
5.3.1 The stowage plan is usually prepared by a representative of either the vessel owner or charterer, e.g., the party which under the governing contract(s) of carriage is responsible for cargo stowage, lashing and securing. The Master should consider the various factors regarding the stowage plan from a safety perspective, including but not limited to ensuring: (1) the cargo to be loaded onboard does not exceed any maximum allowable strength of the tank top taking into account the individual weights of cargo units and cumulative weights of tiered cargo, such as steel coils; (2) the amount of cargo loaded onboard does not make the vessel exceed her allowances under the International Convention on Load Lines, 1966; (3) the stowage planning should take into account the permissible tween deck load and the vessel’s longitudinal strength (bending moment and stress); (4) the vessel’s stability is not compromised when loading, during transit at sea or discharging; American Club: Transport Guidance for Steel Cargoes 45 (5) the cargo consignments are properly distributed amongst cargo holds to ensure that no individual cargo hold is heavily loaded in comparison to other cargo holds; (6) consideration for vessels that call to multiple ports that load and discharge cargoes in intermediate ports. Any such operations should not result in poor cargo distribution that may adversely affect the vessel’s stresses, strength, stability or seaworthiness during the remainder of the voyage; and (7) whether there is any incompatibility between the cargoes and/or difficulty on lashing and securing of the cargoes on the completion of loading, for example, containers or roll base cargo (trucks) on the top of other cargo inside cargo hold, equipment or box shaped cargo on the top of round shaped cargo (such as rolled steel coils), etc. If such a situation presents itself, the stowage plan should be rejected and adjustments should be made. 5.3.2 Cargo should be loaded only when details of the cargo to be loaded is fully understood, the stowage, dunnaging, lashing and securing plan have been reviewed and agreed between the vessel’s Master and the party responsible for these tasks such as the charterer of the vessel and/or shippers of the cargo. 5.3.3 Tank top strength for cargo stowage. The overall weight (load) of a stowage of cargo is limited by the maximum permissible tank top load. The maximum permissible load per square meter of surface area is supplied by the shipbuilder and approved by the vessel’s classification society. The details for each individual cargo hold are usually provided in the vessel’s Trim and Stability Booklet, Loading Manual and/or Cargo Securing Manual. However, unless stated otherwise, the permissible load referred to assumes a uniform weight distribution which is encountered for homogenous bulk cargoes such as grain, coal or iron ore. It does not apply to the carriage of steel coils, which exert a spot load force concentrated at the point where the coil meets the dunnage/tank top. It should be remembered that the weight of the piece or pieces of cargo should be sufficiently and appropriately spread by the use of dunnage materials over the tank top area used in the calculation. If there is any doubt, the classification society should be immediately consulted. The theoretical maximum permissible tonnage of homogeneous bulk cargo allowed to be stowed in an individual cargo hold is calculated as follows: tải về 1.97 Mb. Chia sẻ với bạn bè của bạn:
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