RE: Why such a big crane?4 Nov 2018 09:22
Sari
Changing cranes not that it's the issue in this case is very dangerous a and can end in a mistake
Prior to any lift a lifting plan is produced by a competent person
That person needs to be qualified as an Appointed Person
The production of a lifting plan is the appointed persons responsibility
I wold expect one of these a week prior to the lift
The lift ing plan is that and outlines the type of crane to be used ,equipment weights,lifting tackle weights etc etc
The most important output of the plan is the calculated outriggerload
The site appoint a lift manager who informs the Appointed person of any below ground surgeries and whether the ground capacity will take the outrigger loads
The lift can then go ahead with a lift controller who ensures the plan is observed
I would expect a large crane in order that the outrigger loads are down to at least 20ton per metre square and importantly the crane can stand off in order that any load is not transferred by angle of repose into the well
There are also complicated calculation for using a crane to lift and suspend load below the level of the outrigger as in this case
Needless to say you just don't change cranes yes the yard may send a larger one but the process above needs to be followed again and is a pain in the ar#$e
GLA