When securing an individually dogged water tight door, where should the first dog be closed?

When securing an individually dogged watertight door, closing the first dog on the opposite hinge side is crucial for ensuring that the door seals effectively against water ingress. The reason for starting with the dog on the opposite hinge side is to create a balanced pressure against the door frame, allowing for an even seal all the way around the door.

By securing the first dog here, the lock provides an anchor point that reinforces the alignment of the door, thereby minimizing any potential gaps. This technique helps to maintain the integrity of the watertight seal, which is essential for preventing water from entering a compartment, especially in maritime or underwater scenarios where maintaining buoyancy and stability is critical.

Starting with the hinge side or focusing on the top or bottom edges would not provide the same level of effectiveness in sealing, as these locations may not counteract the natural flexing or bending of the door under pressure from water. An even distribution of force initiated from the opposite hinge side ensures that the entire perimeter of the door is drawn tightly against the frame, maximizing the door's watertight characteristics.