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What do you know about international grain code? What are the stability criteria for grain ship?
This replaced the original chapter VI of SOLAS, which contained detailed regulations on the carriage of grain in bulk, with more general requirements and placed the detailed provisions on grain in a separate mandatory code.
Applies to all ships carrying grain (even less than 500 GT) to which SOLAS VI-C
Ship should also have a grain loading manual
Contents of grain loading manual
1) Class approval. 2) Ship particular 3) Instruction for grain loading 4) Worked Example 5) Curves for VHM (Volumetric Heeling Moment) 6) Table of allowable heeling moment. (Data are given against with Disp and KG) 7) Grain loading calculation for typical condition. 8) Reference data for ship stability and grain loading 9) Grain loading calculation with untrimming (for filled compartment)
Grain loading manual should contain DOASOLAS CH. 6 PART C
Carriage of grain
Mandatory for ships carrying grain
GRAIN CODE – PART A specific requirements
GRAIN CODE – PART B calculation of assumed heeling moment and general assumptions
Stability criteria given in grain codeHow do you load grain? What are the different lashings for grain cargo? Asked about shifting boards and to draw strapping and lashing.
Shifting Boards – filled/partly filled
– shifting boards supported by uprights, 50 mm thick, grain tight
– filled – extend downwards from the underside of the deck or hatch covers, to a distance below the deckline of at least one-eighth the breadth of the compartment, or at least 0.6m below the surface of the grain after it has been assumed to shift through an angle of 15o
– partly filled compartment’ – extend both above and below the level of grain, to a distance of one-eighth the breadth of the compartment.Bundling – filled
– saucering/lashing/dunnage/separation cloth/ more dunnage/ tighten lashing/ fill with grain
– lashing 2.4 m apart
– dunnage 25x150x300 fore and aftSaucering – filled
– saucer/separation cloth/ bagged grainOverstowing – partly filled
– level off/ separation cloth or wooden boards/ overstowed with well filled bags to 1/16th the maximum breadth of the free grain surface, or to a height of 1.2 m whichever is greater
Strapping or Lashing
1. Surface of grain should be levelled but slightly crowned.
2. Surface covered with separation cloths or tarpaulins, whose joints overlaps at least 1.8m
3. Two solid floors of 25mm x 150mm to 300mm lumber to be laid athwartship-first tier and F&A-2nd tier and nailed to an athwartship bottom floor.
4. Lashed with double steel strapping, 2.4m apart with ends at a point approx 450mm below the final grain surface.
5. During voyage the strapping shall be regularly inspected.Securing with wire mesh – trimmed, slightly crowned
Cover with burlap or tarpaulin/ two layers of wire reinforcement mesh laid on top, bottom athwartship and top longitudinal. Wire mesh should overlap 75 mm/ secure ends with wooden planks/ hold down 19 mm wire lashing 2.4 mm apart. First and last 300 mm from bulkhead/ tighten with turnbuckle.
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