| Stuffing Box |
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Information AboutStuffing Box |
| CATEGORIES ABOUT STUFFING BOX | |
| ship construction | |
| marine propulsion | |
| seals mechanical | |
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In a conventional stuffing box, the seal itself is provided by packing rings made of greased Flax , which is packed tightly around the propeller shaft, and compressed in place with a threaded nut and spacer. The box may also be fitted with an opening for periodic insertion of Grease between the rings, and sometimes with a small grease reservoir. A stuffing box packed with flax rings is designed to leak a small amount of water, a few drops per minute, when the shaft is turning; this helps keep it lubricated. This amount of leakage is seldom a problem. Dripless seals, using materials more technologically advanced than flax, are also used. An early dripless seal was made of Graphite , but proved to cause substantial Galvanic Corrosion problems that rendered it unsuitable. A more successful dripless seal is made from PTFE (''Teflon''), usually used in combination with rings of conventional flax seals. The stuffing box is usually attached with Hose Clamp s to a short piece of heavy-duty rubber hose, which is then clamped around the propeller opening in the boat's hull. REFERENCES
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