I designed the bridge scuppers.
These particular scuppers pass through the deck, emerge and evacuate the water onto the planking. A “reinforced schedule” pipe (thickness) connects the two holes, which are reinforced because they are difficult to maintain in terms of paintwork.
Sometimes a piece of rubber sheet cut into the shape of a spout is placed on the outside of the planking, to prevent the inevitable rust from running down the hull.
On oil, gas and chemical tankers, they can be plugged in case petroleum products overflow onto the deck. These are plugged with a special rubber-brass stopper, the nut of which compresses the rubber against the wall of the scupper to make it watertight.
Stoppers are compulsory on scuppers used in commercial operations, to prevent pollution from reaching the sea in the event of a tank overflow or a leak in a cargo or hydraulic pipe, and to stop the leak in time, before it spills over the fish plate on deck.
It saved the day several times.
In general, the system also includes 2 empty 200-liter drums on each side of the ship and a portable pneumatic pump, either to pump the product spilled on deck (which accumulates aft of the deck due to the ship's trim) directly into the drum, or to another tank containing the same product.
Self-priming pneumatic diaphragm pump, remarkably efficient and indispensable on board.
The plugs are permanently fitted near the scuppers, which are attached to the railings by a stub connected to the ring shown in the photo.
When it rains, of course, they have to be temporarily removed to allow any accumulated water to drain away. Then put them back on immediately.
Stern details.
The rope gratings are positioned like this on the plan, but in my opinion they should have been moved a little forward so as not to interfere with the windlass manoeuvring the hawsers, which is what I'm going to do.
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