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Python® UNI-4

Main Applications:

Python® UNI-4 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 timber 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.

Rope Characteristic:

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.

We do combat that by inserting a fiber core into each of the 4 strands and that each strand has 39 wires. This is somewhat of a compromise between good crush resistance, attained rope strength, and acceptable flexibility.

Its rotation resistant characteristic is not all that great but is sufficient for most 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).

Do NOT use Python® UNI-4 wire rope attached to a swivel or have one or both rope ends rotate freely under load. Doing so will result in a loss of rope strength and reduced fatigue life.

Block Twisting (Cabling) will occur when used exceeding certain lifting heights. This is NOT a nonrotating rope. Call for advice

Breaking Strengths

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.

 

Steel Wire Rope,
Rotation Resistant, Compacted

Construction:

4 x 39 rotation resistant, fiber core, RRL

4-strand wire rope for all applications which call for a tough but at the same time rotation resistant rope type. Mainly used on bulk shipunloader cranes with grabs and on heavy duty construction equipment, like pile drivers. The swage compaction process results in nearly oval outer strands which gives the rope a smooth outer surface for increased abrasion resistance to be able to withstand the rough bulk unloading procedures and multiple layer drum crushing.

Specify if galvanized finish is required.

Python® UNI-4 4X40 rotation resistant

Rope Dia. (mm)

Rope Dia. (inch)

Nominal Strength

Weight per foot

kN

tons of 2000 lbs

kg / m

lbs / ft

 

 

 

 

 

 

18

 

224

22.9

1.3

0.87

19

3/4

250

25.5

1.45

0.97

20

 

277

28.2

1.61

1.08

22

7/8

335

34.2

1.95

1.31

24

 

399

40.7

2.32

1.55

25

1

433

44.1

2.51

1.68

26

 

468

47.7

2.72

1.82

28

1 - 1/8

543

55.4

3.15

2.11

30

 

623

63.5

3.62

2.43

32

1 - 1/4

709

72.3

4.12

2.76

33.5

 

777

79.2

4.51

3.02

34

 

800

81.6

4.65

3.12

36

 

884

90.2

5.07

3.4

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