Marine Order 43 (Cargo and cargo handling — livestock) 2018
63Cattle — strength of pen and stall structures
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63 Cattle — strength of pen and stall structures
(1) Rails and stanchions that form a fore and aft boundary of a cattle pen or stall 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 3:
| Formula 3 |
|---|
| F = 3336 B (0.574 + 0.0252 Z) |
| where: |
| F is the boundary load in newtons per metre lengthB is the maximum breadth of pen, in metres |
| Z is the vertical distance from a point 0.75 m above the pen or stall 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 1.4 m above the pen or stall 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 cattle pen or stall 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 cattle 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 4:
| Formula 4 |
|---|
| 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) The floor of a cattle stall must be of substantially the same method of construction and of substantially the same scantlings as required for a cattle pen.
(7) Subsections (1) to (4) apply to the floor support of a cattle pen whether or not it also forms the top boundary of a pen on a lower deck.
(8) For a cattle 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.