4-strand crush- and rotation resistant (ForcePac® & HiPac®)
Python® 4-RUNNER was developed for ship cranes using bulk grabs to unload coal, iron ore, and other abrasive bulk loads. Moreover, it has shown it’s superior feature of crush resistance when used with many other tough loads like logs which tends to easily crush normal wire rope.
Because of it’s crush resistance it is also used on pile drivers and other heavy duty construction equipment which requires a crush resistant rope for multiple layer windings, even on smooth drums.
The geometry of ropes which have 4 outer strands results in a somewhat rotation resistant characteristic. The main reason being is that the physical lever arm length from the center of each strand to the center of the rope becomes shorter the less outer strands a rope has; such shorter lever arms results is less torque. Other reasons why this rope is rotation resistant is the ‘regular lay’ construction coupled with a longer than normal rope lay length. On the other hand such a construction is relatively stiff; not only because of the 4-strands but also because of the longer lay length. This is somewhat of compromise between good crush resistance, attained rope strength, and acceptable flexibility.
It’s rotation resistant characteristic is not all that great but is sufficient for most pile driver and ship crane applications.
Strength loss when used with a load bearing swivel is acceptable but we strongly recommend to use this rope with a positioning swivel only (not having roller- or ball bearings).
Note: The maximum CAPACITY, WORKING LOAD LIMIT (WLL), or LINE PULL of the rope usually is 1/5 of the below stated values. For specific information consult the standards applicable to your rope application.
|Minimum Breaking Strength
tons of 2000 lbs
|Rope dia. inch||EIPS||EEIPS||lbs per ft|
|Minimum Breaking Strength kN|
|Rope dia. mm||1960 N/mm²||2160 N/mm²||kg per meter|