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 TB 55-1900-232-10
socket The dimensions and weights of three common sizes of open and closed Spelter sockets are shown in Figure B-8
The strength of these sockets, properly made, exceeds the strength of the wire rope for which they are designed. The
dimensions are given in detail to assist in selecting the appropriate mating jewelry.
WARNING
When using a termination on the tow hawser of less than 100 percent efficiency, the
base strength to which the factors of safety are applied must be adjusted accordingly.
See Table B-3 and NSTM 613 for efficiency of wire rope terminations.
Wire terminations are not tested because they are stronger than the safe working strength of the wire. Instead, reliance is
placed on the skill of the operator, who is initially qualified and maintains his qualification as described in NSTM 613.
Factors of safety listed in Table 6-4 and discussed in Appendix L are applicable to the nominal breaking strength of new
wire When terminations other than the poured socket are used, the reduced efficiency of the termination must be included
in the allowable load calculations. Furthermore, if the reason for alternate termination is to replace a failed termination or
a parted wire, it must be assumed that the balance of the hawser has been overstrained as well. If it is neces- sary to
continue use of the questionable hawser, doubling the factor of safety against the lowered system strength would be
appropriate.
Table B-1. Wire Hawsers Carried by U.S. Navy Towing Ships.
Wire Rope
Ship Class
Hawser Diameter
Core
by Length
ATF 76
2" x 2100'
Fiber
ASR 7
2" x 2100'
Fiber
ARS 6
2" x 2100'
Fiber
ATA 120 & 170
2" x 2100'
Fiber
ARS 38
2" x 2100'
Fiber
ATS 1
2 " x 3000'
IWRC
T-ATF 166
2 " x 2500'
Fiber
ARS 50
2 " x 3000'
IWRC
B-11
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