The nofollowing contains subjective comment on lifting operations with the Grove AT1500, telescoping crane with flyboom It does not constitute a set of instructions and does not supersede in any way LOLER of other lifting operation regulations. In addition there are several factors such as outrigger extension, outrigger pad size and ground state which have been specifically excluded as they apply only to a shore based lift. We assume that the counterbalance weight is fixed and that the stability area of the load capability chart does not apply

In addition not considered here is the trim of the vessel although this will have an effect and should be considered

Crane Mounted Load Computer

The Grove Crane has a load computer which measures the load weight, Boom Extension and Boom angle. Form this it can compare computed load against a model stored within its memory. As the load approaches overload alarms are sounded. The computer has an extra mode which takes into account operation with the flyboom. This load computer is there as a safety factor and in no way should be considered to replace proper planning.

Lifting operations

To carry out a safe lifting operation a set of variables must be known; these consist of the nofollowing

• The weight of the lift.
  
• The height of the lift
  
• The Radius of the lift
  
• Obstructions within the lift area
  
• The Sea State

Weight Of lift

This may be either a known weight i.e. a weight which is certified and clearly marked, or an unknown estimated weight- in which case the weight is estimated and a factor of safety applied

To be added to the lift weight is the weight of the hook and lifting accessories before calculations are carried out. For the hook this is given as a test weight of

• 0.20 tonne for 10t hook and headache ball
  
• 0.65 tonne for 50t 3 sheave block

Note that unless the lift weight is certified it is always classed as estimated in all circumstances.

Height of the Lift

Note this is measured form the boom pivot point and not the deck

The height of the pivot point above the deck is 4.2m

Radius of Lift

In a similar fashion the radius is measured from the pivot point and not the centreline of the crane. The distance from the pivot to the centreline is 2.1m.

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