Table 4-6.--Rope Elongation
6. Cut out the seizing and unlay a strand in the
opposite direction.
APPROXIMATE ELONGATION
7. Repeat steps 4 and 5.
AT BREAK (PERCENT)
8. Tie an overhand knot in the two remaining
TYPE
NYLON POLYESTER ARAMID
strands.
55
Three-
35
9. Take a tuck with each strand or split each strand
strand
and make tucks in opposite directions with the halves.
30
Double-
30
View D shows the completed long splice.
braided
65
45
Plaited
ALONGSIDE MOORING
Four-strand
6
Mooring alongside a pier and getting under way
from a pier are basic, yet extremely critical, functions
Nylon rope, on parting, is stretched nearly one-half
performed by the deck department. Mooring a ship
of its original length. This length is recovered
safely takes preparation, training, and the teamwork of
instantaneously on parting, causing snap back with
all hands. A sound working knowledge of capstans,
hazardous force. In view of this danger, it is imperative
gypsy heads, deck and pier fittings, and the proper use
that no one stand in direct line of the pull when a heavy
of mooring lines is a must.
load is applied to the line. Polyester rope is stretched
MOORING LINES
nearly one-third of its original length and is as
dangerous as aramid rope, which stretches six percent.
Ships are moored to piers, wharfs, and quay walls,
Table 4-6 shows the approximate elongation of nylon,
and nested with other ships by mooring lines, which
polyester, and aramid ropes at break. These elongation
percentages were taken from the mil specs and
vary in size depending on the type of ship. For instance,
commercial item descriptions for the ropes.
SPLICING LINE
The ends of line may be joined permanently by a
long splice or by a short splice. Whether a long or a
short splice is used depends on how the line is to be
used. The short splice is described in the NSTM,
Chapter 613 and will not be repeated here. In this
manual, we will discuss only the long splice.
LONG SPLICE
A long splice does not change the diameter of a rope
materially; therefore, it is used to join two ropes when
the rope will run over sheaves in a block. To make a
long splice, take the following steps:
1. Unlay the end of each rope 15 turns.
2. Place the ends together, as shown in view A of
figure 4-9, and seize five of the strands together.
3. Unlay the loose strand ten more times.
4. Lay the opposite strand from the other rope in
the groove left by inlaying the first strand (view B).
5. Tie an overhand knot, as shown in view C.
Figure 4-9.--Long splice in fiber line.
4-10
