The crane gtaI of a crane is the value of the average of the lifting load moments in tons/meters at three main boom lengths (minimum, average and maximum) and the corresponding average flight.

NOTES

1. The Crane Capacity Index is based on the maximum boom length, counterweight, outrigger positions, etc. as listed in the crane book.
2. For telescopic cranes, minimum boom length means the length of the boom with all telescopic parts retracted and maximum boom length means the length of that boom with all telescopic parts extendedFor lattice boom cranes, the maximum boom length is the largest boom length listed in the manufacturer's delivery program for the type of crane.
3. The main boom is that boom that carries the main hoisting block at its end.
4. a. If the average flight does not appear on the lifting table, the load belonging to the average flight: shall be determined arithmetically by means of rectilinear interpolation between the load values belonging to the next larger and the next smaller flight.
   b. If the average jib length does not appear on the lifting table, the average flight belonging to this jib length shall be found by means of interpolation between the average flight of the next larger and the average flight of the next smaller jib length.
   For the flight found in this way, load values are determined on the table of the adjacent larger and the adjacent smaller boom length. Interpolation between these two latter load values then gives the load belonging to the mean flight of the mean boom length.
5. The flight of a loading shovel or forklift, for example. to which a boom is mounted that cannot swing on the undercarriage, is the distance from the perpendicular of the lifting hook to the center of the wheelbase.
6. The Crane Capacity Index should be calculated from the lifting table applicable to the crane's largest permissible slewing range (usually 360 degrees)

Note

The maximum load is the largest load on the basis of which overload testing has taken place at the time of subtraction and testing before first commissioning.

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