Weights of Steel Wire Rope

Dear Readers,

Wire ropes are key members for erection activities. During erection scheme finalization it is very much essential to know the self weight of rope. Lifting weight calculation including the weight of erection object, Rope weight, Tools & Tackles weight. Steel wire rope weight is below. Weights are given per 100 Meter.

For More Details about Steel Wire Rope Click Here

For More Details about SWL for Mechanically Spliced Slings Click Here

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Safe Working Load (SWL)

Dear Readers,

SWL is very important and essential for rigging & hoisting works during construction activities and sometimes stated as the Normal Working Load (NWL).

 

It is the mass or the force a piece of lifting equipment, lifting device or accessory can safely utilize to lift, suspend, or lower a mass without fear of breaking. Usually marked on the equipment by the manufacturer and is often 1/5 of the Minimum Breaking Strength (MBS) although other fractions may be used such as 1/4, 1/6 and 1/10. 

The SWL is determined by dividing the minimum breaking strength (MBS) of a component by a safety factor assigned to that type and use of equipment. The safety factor generally ranges from 4 to 6 unless a failure of the equipment could pose a risk to life; in that instance the safety factor would be a 10.

For example, if a line has an MBS of 1,000 pounds and a safety factor of 5, then the SWL would be 200 pounds. 1000/5 = 200.  

Thumb Rule for Determination of SWL of Wire rope slings:

SWL = 8*D²; in Tons; Where D diameter of rope in inches.

Example:

1 Inch diameter rope 1*1*8 = 8 Tons

½ inch diameter rope 0.5*0.5*8 = 2 Tons

Other way to calculate the SWL of any wire rope by

1. Obtained the Breaking strength of the wire rope as per the class.
2. Consider the Safety factor (Generally taken 5 for wire rope, except taken 10 while use for lifting person)
3. Divided the breaking Strength by Factor of safety.

 For More Details about Safety Helmet Click Here

Steel Wire Rope

Dear Readers,

Let us discuss about the steel wire rope and classifications. Wire ropes are used in construction for handling of materials. Generally in construction 6 x 19 ropes are used. Centre core may by FC (Fibre Core) or SC (Steel Core)

 

In a numerical classification of rope construction, the first number is the number of strands; the second number is the number of wires in each strand. Thus, 6 x 25 means the wire rope has six individual strands with each strand containing 25 wires.

 

When such numbers are used as designations of standard wire rope classes, the second figure is purely nominal, in that the number of wires per strand for various ropes in the class may be slightly less or more than nominal.

 

For ropes with a wire strand core (WSC), a second group of numbers may be used to indicate the construction of the wire core, such as 1 x 21, 1 x 43 etc.

The standard construction of wire rope falls into four general classifications are 6 x 7, 6 x 19, 6 x 37, and 8 x 19. The first three ropes each contain six strands. In the fourth, each rope contains eight strands. The construction of a steel wire rope is expressed according to the following:

Example: 6x36-FC

     6 is the number of strands in the steel wire rope

     36 is the number of wires in the strand

     FC is the type of the core

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