I have a slight problem in the calculation on the SWL/WLL of some "improvised" lifting points.
- The item is a 1020 mild steel angle iron 50x50 frame cage with 50x50 mesh lining. It weighs approx 150kg. Size is 2400x1200x1500.
- It must be able to hold a weight of 800kg when suspended.
- the lifting points have been locally manufactured from 10mm round bar 1020 mild steel and then "mig" welded to the top corners of the frame with about a 5mm all round single fillet weld.
My second query is they have also welded chain link to the sides of the cage to be used as tie down points. The chain is 8mm dia and one link is welded to the cage. There are no visible markings on the chain so I am not sure whether it is Hercalloy, lifting or tiedown chains or any other one of numerous types available.
This has been used for quite a few years now and shows no signs of stress or metal fatigue or fracture. The chain links are not deformed. The welds on the "lifting points" have been crack tested and show no signs of cracking. There is also no signs of stretching or necking.
Any advice or assistance on what the safe lifting weight/mass would be appreciated.
The same would be appreciated on the so called tie down points.
- The item is a 1020 mild steel angle iron 50x50 frame cage with 50x50 mesh lining. It weighs approx 150kg. Size is 2400x1200x1500.
- It must be able to hold a weight of 800kg when suspended.
- the lifting points have been locally manufactured from 10mm round bar 1020 mild steel and then "mig" welded to the top corners of the frame with about a 5mm all round single fillet weld.
My second query is they have also welded chain link to the sides of the cage to be used as tie down points. The chain is 8mm dia and one link is welded to the cage. There are no visible markings on the chain so I am not sure whether it is Hercalloy, lifting or tiedown chains or any other one of numerous types available.
This has been used for quite a few years now and shows no signs of stress or metal fatigue or fracture. The chain links are not deformed. The welds on the "lifting points" have been crack tested and show no signs of cracking. There is also no signs of stretching or necking.
Any advice or assistance on what the safe lifting weight/mass would be appreciated.
The same would be appreciated on the so called tie down points.
