Is there an effective utility for estimating the required size of a crane? I’m an estimator for a mechanical contractor, and it seems we never allow enough money for crane rental. How can I effectively adjust my estimates?
well I'm not sure but need to over estimate for safety cause there are all ways mitigating forces @ play when using cranes be safe first dude you dint want to be sued for being cheap and if yo do good work word will get around
The only effective way to estimate the size of a crane when needed is to know, without a doubt the weight of the heaviest thing that you have to lift, and allow at least a 20% margin for safety. This is standard practice in building bridges, in particular - the weight of EVERYTHING is clearly marked, or just generally known. If there are bridge segments to load on a barge, for example and the heaviest segments are 220 tons, then a 300 ton crane is used. Always err on the side of safety.
Sub contract this one section of crane use out to an rigging company using a flat rate. That way if they need a larger crane it is on them the down side is they always bill high but there will not be over runs.
