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Sunday, June 5, 2016

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

3 comments:

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Anonymous said...

What is SWL of 6 meter long span of ISMB 400web + 140 flange & thickness 9mm

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