Shaft Seal Arrangement for a Ship Bulkhead

A seal arrangement for providing a seal around a shaft extending through an opening in a bulkhead, comprising:

• a seal ring that comprises plural seal ring segments and has an inner diameter which can be adjusted by moving said seal ring segments radially outwardly and radially inwardly relative to an axis of said seal arrangement;
• a housing that supports said seal ring and is adapted to be mounted on the bulkhead around the opening of the bulkhead;
• plural power-activatable radial actuators that are carried by said housing circumferentially distributed about said axis, and are coupled to said seal ring segments;
• and
• at least one spring that is coupled to and applies a radially inward spring-bias to said seal ring segments and/or said radial actuators;
• wherein, in an installed condition, said seal ring encircles the shaft, said radial inward spring-bias of said at least one spring urges said seal ring segments radially inwardly into sealing contact on the shaft whereby said inner diameter of said seal ring matches an outer diameter of the shaft, and said radial actuators when activated are operative to pull said seal ring segments radially outwardly away from the shaft against said radial-inward spring bias so that said inner diameter of said seal ring becomes larger than the outer diameter of the shaft.