Dear Friends,
When a safety man is at site men look at him for advice. With regard to safety his words are final. Are we prepared ?
Let us understand things in the right perspective as professionals.
Read my first question - At what height PFAS need be employed and why ? This question is about PFAS and not fall protection as such. PFAS is different from fall protection.
Fall protection prevents a fall. Prevents people from reaching the fall hazard by creating a barrier between the person and the fall hazard.
Personal Fall arrest system stops a fall that is in progress through a tie off system.
At what height PFAS need be used ? Ans: Above 6 feet.
Why ? Ans : From research falls from above this height are found to be fatal ?
Now; above 6 feet can we use safety harness with shock absorbing lanyard? Answer is -NO. It is not designed for use at that height.
Then at what height we can use it? Answer is where the free fall distance is more than 19.5 feet.
Hansa please bear with me for allowing workers to use safety harness with shock absorbing lanyard at a height less than 19.5 ft gives them a false sense of protection only where as it is of no use.
What Dipil mentioned is right with regard to the free fall distance of 19.5 feet or 6 mtrs. However pl.note that the elongation of shock absorber is limited to 3.5 feet only and not 6 feet (1.8mtrs). Your calculations need some correction.
So how will you calculate the distance ?
Kindly check the ppt attached. You may get a clear idea.
My way of writing may be a little different. However if my postings are of some benefit to those who read I will be happy to feed more and more of those what I gained through the years.
Regards,
Kesava Pillai