Quantcast PRECAUTIONS - CONTINUED - TB-55-1900-232-100020

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TB 55-1900-232-10
The large and small Smit Brackets are sized to accept the standard end like of 3-
inch and 2-inch chain, respectively. They will directly accept the common link of
considerably larger chains. Check dimensions carefully in designing the tow
connection! (Page 2-33)
The towing ship should reduce the tension on the towing assembly by either slowing
down or stopping prior to cutting or otherwise releasing a towline. (Page 2-34)
A carpenter stopper should not be used unless it is specially designed for the lay,
helix, number of strands and diameter of the specific wire rope. The stopper and
wire rope should both be clean and free from sand or other abrasives. (Page 3-35)
When towing "on the dog'" there is no hawser quick-release capability. (Page 2-38)
Whenever the surface of a caprail becomes rough, steps should be taken to repair
or replace it in order to protect the hawser. Caprails should be kept clear of all
appurtenances. (Page 2-44)
Shackles and other fittings frequently come with cotter pins which should be
replaced with locking bolts with two jam nuts. (Page 2-51)
Special forged shackles, when used with chain stoppers and carpenter stoppers,
utilize care- fully machined screw pins and are permissible in towing. Such pins
must remain accessible for inspection and service while in use. (Page 2-52)
Whenever a poured socket is installed on a wire rope, the condition of the lubricant
in the portion of the rope near the socket should be checked and new lubricant
applied to dry areas. (Page 2-52)
Swaging is acceptable only on IWRC (Independent Wire Rope Core) wire rope. It
is not to be used on fiber core rope. (Page 2-52)
Do not allow main reduction gears to rotate unless they are properly lubricated.
This requires full lube oil pressure. (Page 3-6)
Many barges and barge-like vessels tend to be more susceptible to damage and
deterioration than conventional ship-type vessels.  They should therefore be
inspected for hull strength prior to towing. (Page 3-8)
Do not use temporary lashings or other make-shift measures to lock the rudder of a
towed ship. Lock the rudder amidships for towing. (Page 3-8)
A screw-pin shackle shall not be used as a replacement for a safety shackle in
towing A safety shackle will deform under load and still hold, while a screw-pin
shackle's pin can work itself out of the shackle. (Page 3-14)
When picking up a tow, the Conning Officer on the tug should be cautious when
increasing speed and should maintain an even strain on the towing gear. If a
readout is not available on the bridge, tow hawser tension information should be
provided to the Conning Officer by the Towing Watch. (Page 3-16)
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