Section 11(3) in The Merchant Shipping (Equivalent Arrangements For Carriage Of Grain) Order, 1977
(3)where there is a raised deck clear of a hatchway the average void depth measured from the underside of the raised deck shall be calculated using the standard void depth in association with the girder depth of the hatched beam plus the height of the raised deck.(ii)In "filled compartments" which are not trimmed in accordance with paragraph 3 and where the boundary surface has an inclination to the horizontal which is less than 30 degrees, the cargo surface has an inclination of 30 degrees to the horizontal after loading.(iii)Within filled hatchways and in addition to any open void within the hatch cover there is a void of average depth of 150 mm measured down to the grain surface from the lowest part of the hatch cover or the top of the hatchside coaming, whichever is the lower.(b)The description of the pattern of grain surface behaviour to be assumed in "partly filled compartments" is shown in section IV of this Part.(c)For the purpose of demonstrating compliance with the stability criteria in paragraph 4(b) (see Figure 1), the ships stability calculations shall be normally passed upon the assumption that the centre of gravity of cargo in a "filled compartment" is at the volumetric centre of the whole cargo space. In those cases where the Central Government authorises account to be taken of the effect of assumed underdeck voids on the vertical position of the centre of gravity of the cargo in "filled compartments" it will be necessary to compensate for the adverse effect of the vertical shift of grain surface by increasing the assumed heeling moment due to the transverse shift of grain as follows :Total heeling moment = 1.06 × calculated transverse heeling moment.In all cases the weight of cargo in a "filled compartment" shall be the volume of the whole cargo space divided by the stowage factor.(d)In "partly filled compartments" the adverse effect of the vertical shift of grain surfaces shall be taken into account as follows :(e)Total heeling moment =1.12 × calculated transverse heeling moment.(f)Any other equally effective method may be adopted to make the compensation required in paragraphs (c) and (d) above.Notes on Figure 1
