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 TB 55-1900-232-10
FIGURE 2-9. Typical Towline Connection Components.
deck padeye, chain stopper or specialized towing bracket. Sometimes the attachment will use fittings or gear
intended for other purposes, such as SPM fittings, bitts, anchor chain holding fittings or the tow's anchor chain
itself. Sometimes, for planned tows, a new attachment point will be installed. At the other extreme, for an
emergency tow, a completely ad-hoc connection, such as a heavy chain wrapped around a strong foundation
may be used. Each of these attachment methods is discussed more thoroughly in subsequent sections of this
manual.
2-4.2
CHOCKS AND FAIRLEADS. Most tows make the towline connection on deck. Exceptions are
situations involving towing from the tow's anchor chain through the hawsepipe and craft, usually barges, fitted
with deck edge towing padeyes. Whether using a bridle arrangement or a single-point connection, the point at
which the towline (or bridle legs) crosses the deck edge requires careful attention
to protect the towline as
well as the towed ship's structure. These points must be robust and include a generous radius. They include
bullnoses, closed chocks and roller chocks. See Figure 2-10. Planned tows often will involve installation of a
special fair- lead, because the radii of chocks and other fittings designed for mooring are much less than
desirable for towing. Emergency tows generally must make do with whatever is available, remembering that
extra towline chafing and structural damage to the tow are probable. In this case, the towline component
crossing the deck edge will usually be a chain, heavier in size then otherwise would be required for strength
alone.
2-4.3
CONNECTING HARDWARE OR JEWELRY. These items include shackles, plate shackles, joining
links, detachable links, bridle flounder plates and specially-sized and arranged lengths of chain. This hardware
is
2-16
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