Marine Orders - Part 43: Cargo & Cargo Handling—Livestock, Issue 6
21Sheepstrength of pen fittings
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21 Sheepstrength of pen fittings
21.1 Subject to 21.4, rails and stanchions forming a fore and aft boundary of a sheep pen must be capable of withstanding a load per metre length determined by the application of Formula 1, uniformly distributed up to the height of the top of the uppermost rail the centre of which is at a height of not more than 900 millimetres above the pen floor.[29]
Formula 1
F = 1668 B (0.574 + 0.0252 Z) newtons per metre length
where: F = load per metre length of boundary;
B = maximum breadth of pen, in metres; and
Z = the vertical distance from a point 0.50 metre above the pen floor to the ship's water-line corresponding to the anticipated lightest load, in metres.
21.2 Rails and stanchions forming a boundary of a sheep pen other than a fore and aft boundary referred to in 21.1, must be of substantially the same method of construction and of substantially the same scantlings as required for the fore and aft boundaries.
21.3.1 Subject to 21.4, any two-thirds of the area of the floor of a sheep pen must be capable of withstanding 100 per cent of the floor load, determined by the application of Formula 2, uniformly distributed over the area.
Formula 2
Image unavailable in extracted text
where: F = floor load, in newtons per square metre
d = draught of the ship corresponding to the anticipated lightest loaded water-line, in metres;
y = longitudinal distance from the midpoint of the pen to amidships, in metres; and
L = length between the perpendiculars of the ship in metres.
21.3.2 A floor support of a sheep pen that also forms a boundary of a lower pen must comply with 21.1, 21.2 and 21.3.1.
21.4 In respect of a livestock pen structure above the uppermost continuous deck, the requirements of 21.1, 21.2 and 21.3.1 may be dispensed with if the owner of a ship obtains the approval of the Manager, Ship Inspections, to calculations showing that the rails and stanchions of the pens and the pen floor and floor supports of those pens in that structure are capable of withstanding appropriate design forces using the criteria specified by the classification society responsible for approving the design of the structure.
21.5 The maximum stresses permissible for materials used in the construction of the boundaries and floors of a pen must not exceed the values specified in Table 4 when under the loads determined in accordance with 21.1, 21.3.1 and 21.4, as appropriate.
Table 4