Abstract: The invention relates to a bulkhead door arrangement for sealingly closing an opening which is located between two mutually adjacent spaces and through which a conveyor belt extends. The arrangement includes a vertically moveable door part provided with a sealing strip on the side thereof facing towards the conveyor belt. When the door arrangement is in its closed position, the door part presses the conveyor belt into abutment with a sealing strip provided in the bottom of the opening, and separate sealing devices abut the side edges of the conveyor belt.

Abstract: A dust control system to prevent the escape of dust from a cargo hold during bulk materials cargo handling operations wherein a plurality of rigid frames are suspended in parallel configuration across the hold. Unloading equipment is inserted through the frames and the frames are freely traversable between opposite sides of the hold while tarpaulins disposed on either side of the frames expand or accordion as the frames' positions are shifted in order maintain coverage from side to side. Fixed tarps cover the rest of the hold. Curtains extending downwardly from the frames and from those tarpaulins affixed to the frames engage the fixed tarps in an abutting relation to form a seal.