The collier now building at General Dynamics, Quincy, Shipyard for Keystone Shipping and New England Electric is a self-unloader and the first coal burning and carrying vessel to be built in the United States in 25 years.
Two 4-foot-wide continuous conveyor belts run the full length of the ship for unloading. To maintain watertight integrity of the four bulkheads through which the belts pass, challenging sealing problems arose.
The Walz & Krenzer patented conveyor belt door was selected because of its unique sealing characteristic. The door employs a floating rotating butterfly section between the load and return belts which was specifically designed to accommodate belt drift and provide adequate vertical clearances during unloading operations.
When the conveyor belt door is in the open position, generous vertical and side clearance are maintained, eliminating belt wear and damage in this area. No sealing gaskets are exposed to wear or damage during unloading operations.
All controls and operating gear are explosion proof.
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