Wll vs Swl???

[waterbuoy]

MBL is the Minimum Breaking Load, to which a factor of safety is applied to give the WLL.

 

EG a strop with an MBL of 5 tonnes will have a WLL of 1 tonne if a factor of safety of 5 is required/specified

 

Thereafter the SWL is derived by applying other factors (eg angle of pull) to the WLL - these factors may be job specific, or might arise due to a combination of items being used together such as the two lifting strops I mentioned earlier.

 

As already stated, SWL and WLL are often thought to be the same but this is not correct. The SWL of an individual item can only be less or the same as the WLL.

 

Most lifting items are now stamped with a WLL, or at least they should be!

[waterbuoy]

Great post!

 

Now, if only we could weigh them pesky lumps before we send 'em down the line 😄

 

The post you referred to Kevin was taken straight from

 

Differences Between WLL and SWL | Difference Between

 

Unfortunately, I don't think it is factually correct, nor does TIMON from what he has posted!

[Arctostaphylos uva-ursi]

Just so.

WLL is the working load limit which is the maximum load which an accessory can by design lift. SWL safe working load is the load that can be lifted under particular service conditions. e.g. The SWL of sling chains depends on the included angle.

[kevinjohnsonmbe]

The post you referred to Kevin was taken straight from

 

 

 

Differences Between WLL and SWL | Difference Between

 

 

 

Unfortunately, I don't think it is factually correct, nor does TIMON from what he has posted!

 

 

Have I been duped?? A simple cut & paste when I thought it had been an epic typing session!!

 

I agree the need for a working understanding (more so for LOLER bods) and it's easy enough to get confused, but until we have the capability to load test the lowering device anchor point and accurately measure the weight, mass, velocity combo of the lumps, I find it all a bit of an academic rather than practical exercise. 😳

[waterbuoy]

Agreed that it can all be a bit academic - until something goes pear shaped or you have a LOLER inspection!

[carlos]

its funny all these swl mbl mbs etc , whilst i look at them all and take them seriously and try and use the appropriate gear, i can honestly say i have never once known the weight of anything i have ever lowered or the force of any pull in my whole time doing tree work.!

any one else agree or do some people have accsess to dynometers ?? would love to have one for a few days.

carl