Python Wire Rope - Wesco Industries Ltd.
Python Wire Rope - Wesco Industries Ltd.
Python Wire Rope - Wesco Industries Ltd.
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<strong>Wire</strong> <strong>Rope</strong><br />
<strong>Python</strong> ® UNI-4<br />
4-strand crush- and rotation resistant<br />
UNI-4<br />
4 outer rope strands with fiber core<br />
40 wire parallel strand construction<br />
Complete rope is compacted resulting in oval shaped outer strands<br />
increased surface area for better contact and durability<br />
Main Applications:<br />
<strong>Python</strong> ® UNI-4 was developed for ship cranes using bulk grabs to<br />
unload coal, iron ore, and other abrasive bulk loads. Moreover, it<br />
has shown it’s superior feature of crush resistance when used with<br />
many other tough loads like logs which tends to easily crush normal<br />
wire rope.<br />
Because of it’s crush resistance it is also used on pile drivers and<br />
other heavy duty construction equipment which requires a crush<br />
resistant rope for multiple layer windings, even on smooth drums.<br />
<strong>Rope</strong> Characteristic:<br />
The geometry of ropes which have 4 outer strands results in a<br />
somewhat rotation resistant characteristic. The main reason being<br />
is that the physical lever arm length from the center of each strand<br />
to the center of the rope becomes shorter the less outer strands a<br />
rope has; such shorter lever arms results is less torque. Other<br />
reasons why this rope is rotation resistant is the ‘regular lay’<br />
construction coupled with a longer than normal rope lay length. On<br />
the other hand such a construction is relatively stiff; not only<br />
because of the 4-strands but also because of the longer lay length.<br />
We do combat that in that we insert a fiber core into each of the 4<br />
strands and that each strand has 40 wires. This is somewhat of<br />
compromise between good crush resistance, attained rope<br />
strength, and acceptable flexibility.<br />
It’s rotation resistant characteristic is not all that great but is<br />
sufficient for most ship crane applications.<br />
Strength loss when used with a load bearing swivel is acceptable<br />
but we strongly recommend to use this rope with a positioning<br />
swivel only (not having roller- or ball bearings).<br />
-24-<br />
Do NOT use <strong>Python</strong>®<br />
UNI-4 wire rope attached<br />
to a swivel or have one or<br />
both rope ends rotate<br />
freely under load. Doing<br />
so will result in a loss of<br />
rope strength and<br />
reduced fatigue life.<br />
Block Twisting (Cabling)<br />
will occur when used<br />
exceeding certain lifting<br />
heights. This is NOT a<br />
non-rotating rope.<br />
Call for advice