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Posted By Mohammed
Hi there,
During a rig move we had to lift a cement block with a total weihgt of 6 tons and had been wondering whether or not the use of two slings of 4 tons each was acceptable to lift it.
Kind regards.
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Rank: Guest
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Posted By Renny Thomson
Sorry, but you've supplied insufficient information on how it is slung, angles of slings etc.
You could try asking the competent person who planned the lifting operation....
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Rank: Guest
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Posted By The toecap
Generally yes. On the assumption that they are correctly sited i.e spaced at equidistant intervals on the load and the load has no sharp edges. But as the previous respondent said. There isn't enough info'.
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Rank: Guest
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Posted By Christopher Kelly
Check with BS6166 for angle of slings and work out accordingly. Also refer to BS7121.
Assuming the load is totally horizontal then split the weight according to the number of items of tackle (ie in this case by 50%) and as long as SWL of each sling is more than this (ie 3tonnes) then you are OK. You should allow a margin for error in case the angle of the load alters or weather conditions can significantly change the loading without the angle changing. Guidance on all of this in the above standards.
As said previously there are other things to consider, you don't mention type of slings, how they will be attached etc. You need to calculate a max safe wind-speed (before applying your marginal percentage) and measure on the day of the lift.
You should have an appointed person to plan lifts such as this. A competent person wouldn't need to ask the questions so I would suggest that you ensure compliance with regs by appointing a suitably competent appointed person. Oh - competent banksmen / slingers also to follow instruction from the appointed person.
Hope of help,
Regards
Chris
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