Marine Order 43 (Cargo and cargo handling — livestock) 2018
59Sheep, pigs and goats — strength of pen structures
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59 Sheep, pigs and goats — strength of pen structures
(1) Rails and stanchions that form a fore and aft boundary of a sheep, pig or goat pen must be able to withstand a load per metre length, uniformly distributed up to the height of the top of the uppermost rail, using Formula 1:
| Formula 1 |
|---|
| F = 1668 B (0.574 + 0.0252 Z) |
| where:F is the boundary load in newtons per metre length |
| B is the maximum breadth of the pen, in metres.Z is the vertical distance from a point 0.5 m above the pen floor to the vessel's water-line corresponding to the anticipated lightest load, in metres |
(2) However, a rail the centre of which is more than 900 mm above the pen floor is not to be included in the load calculations.
(3) Rails and stanchions that form a boundary, other than a fore and aft boundary, of a sheep, pig or goat pen must be of substantially the same method of construction and of substantially the same scantlings as required for the fore and aft boundaries.
(4) Any two-thirds of the area of the floor of a sheep, pig or goat pen must be able to withstand 100% of the floor load uniformly distributed over the area.
(5) The floor load is determined according to Formula 2:
| Formula 2 |
|---|
| F = |
| where:F is the floor load, in newtons per square metre |
| d is the draught of the vessel corresponding to the anticipated lightest loaded water-line, in metres.L is the length between the perpendiculars of the vessel, in metres.y is the longitudinal distance from the midpoint of the pen to amidships, in metres. |
(6) Subsections (1) to (4) apply to the floor support of a sheep, pig or goat pen whether or not it also forms the top boundary of a lower tier pen.
(7) For a sheep, pig or goat pen structure above the uppermost continuous deck, instead of compliance with subsections (1) to (5), AMSA may approve calculations that show that the rails and stanchions of the pens, the pen floors and the floor supports can withstand appropriate design forces, according to the criteria specified by the vessel’s classification society for the design of the vessel structure.
(8) The stresses for materials used in the construction of boundaries and floors of a pen must not exceed the figures in Table 5 when the materials are under the loads determined in accordance with subsections (1) and (5).