| When pressures exceed 100 psi seating (or 60 psi unseating), doors with an O-ring design are used to achieve a 100% watertight seal. High-pressure doors are often used in tunnels, hydroelectric plants, and high-pressure chambers for industrial processes.
The door construction is typically heavier than doors that see lower pressures. Both the door and frame have matching machined flat surfaces. One of these surfaces has a dovetail groove for the O-ring, which creates the watertight seal.
The doors are opened/closed using the same type of mechanisms found in other watertight doors (quick-acting handwheels or individual dogs). Sliding doors are recommended when there may be a need to close the door with water coming through the opening.
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