Section 11 in The Merchant Shipping (Equivalent Arrangements For Carriage Of Grain) Order, 1977

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Union of India - Section

Section 11 in The Merchant Shipping (Equivalent Arrangements For Carriage Of Grain) Order, 1977

11. Grain Loading Information. - This information shall be sufficient to allow the master to determine in all reasonable loading conditions the heeling moments due to grain shift calculated in accordance with Part B. It shall include the following :

(a)Information which shall be approved by the Central Government :(i)Curves of tables of grain heeling moments for every compartment, filled or partly filled or combination thereof, including the effects of temporary fittings;(ii)tables of maximum permissible heeling moments or other information sufficient to allow the master to demonstrate compliance with the requirements of Paragraph 4(c);(iii)details of the scantlings of any temporary fittings and where applicable the provisions necessary to meet the requirements of section I(E) of Part C.(iv)typical loaded service departure and arrival conditions and where necessary, intermediate worst service conditions;(v)a worked example for the guidance of the master;(vi)loading instructions in the form of notes summarizing the requirements of this Appendix.(b)Information which shall be acceptable to the Central Government :-(i)ship's particulars;(ii)lightship displacement and the vertical distance from the intersection of the moulded base line and midship section of the centre of gravity (KG);(iii)table of free surface corrections;(iv)capacities and centres of gravity.Part-B--Calculation of Assumed Heeling Moments Section I-Description of the assumed voids and method of calculating intact stability.(A)General(a)For the purpose of calculating the adverse heeling moment due to a shift of cargo surface in ships carrying bulk grain it shall be assumed that :(i)In "filled compartments" which have been trimmed in accordance with Para 3 avoid exists under all boundary surfaces having an inclination to the horizontal less than 30 degrees and that the void is parallel to the boundary surface having an average depth calculated according to the formula :Vd = Vd1+0.75 (d-600) mm.WhereVD = Average void depth in mm;Vd1 = Standard void depth from Table I below;d = Actual girder depth in mm.In no case shall Vd be assumed to be less than 100 mm.Table I

Distancefrom hatched or Standard void hatchside boundary of compartment
	metres	depthVd1
0.5	0.5	570
1	1	530
2	1.5	500
2.5	2	480
3	2.5	450
3.5	3	440
4	3.5	430
4.5	4	430
5	4.5	430
	5	430
5.5	5.5	450
	6	470
	6.5	490
	7	520
	7.5	550
	8	590

Notes on Table IFor distances greater than 8.0 metres the standard void depth Vd1 shall be linearly extrapolated at 80 mm increase for each 1.0 metre increase in distance. Where there is a difference in depth between the hatchside girder or its continuation and the hatched beam the greater depth shall be used except that :

(1)when the hatchside girder or its continuation is shallower than the hatched beam the voids abreast the hatchway may be calculated using the lesser depth; and

(2)when the hatched beam is shallower than the hatchside girder or its continuation the voids fore and aft of the hatchway inboard of the continuation of the hatchside girder may be calculated using the lesser depth;

(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

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Union of India - Section

Section 11 in The Merchant Shipping (Equivalent Arrangements For Carriage Of Grain) Order, 1977

11. Grain Loading Information. - This information shall be sufficient to allow the master to determine in all reasonable loading conditions the heeling moments due to grain shift calculated in accordance with Part B. It shall include the following :