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Used when transporting high-stowing and relatively light cargo such as grain, this appropriately-named technique allows for separation and sealing when carrying of several different grades or types of commodities within a single hold.
- The first parcel/grade is loaded into the hold. Laborers descend into the hold and trim the cargo as flat as possible to provide a good base for the next consignment of cargo.
- Once the cargo has been trimmed, tarps are draped over the cargo to protect it further.
- A layer of plywood is placed above the tarp. This acts as a further barrier between the two parcels/grades, and also helps with the discharge of the cargo if vacuvators are used at discharge. The plywood will help keep the vacuvators at discharge from getting jammed up if the were to inhale part of the tarp layer.
- The technician denotes the height at which the separation was placed and relays the information to the discharge port stevedores so that they will know when to expect the bottom of the parcel/grade they're working with and can make required adjustments in their discharge techniques.