Locating the Centre of Gravity when lifting is paramount for lifting safety.
Locating the centre of gravity or C of G of any load is vital for ensuring a safe lift; on some loads it is fairly easy to pinpoint, no
The C of G is the exact point where the total weight of the load is regarded as acting and is the point where all parts exactly balance with each other.
With a regular shaped object, hospital like a steel beam for example, the C of G will be in the middle/ the exact centre point. More complex shaped loads will require estimating and because of this, many test lifts may need to be performed until the C of G is found and the load is evenly balanced.
Sometimes you will need to calculate the weight and C of G of different parts of the load to determine the C of G of the whole load, the diagram below gives an example, and the formula for working out the C of G will be:-
(Wa + Wb + Wc) X = Wa Ya + Wb Yb + Wc Yc from this the unknown distance X can be found.
Once the position is found it should be clearly marked so the slings can be placed accordingly. It should be noted that this calculation determines the C of G in one plane only, and it may be necessary to apply the same calculations in the other two planes to discover the precise C of G.
A load which is not evenly balanced around its C of G will be unstable and the consequences of lifting an unstable load could be catastrophic.