Intermediate Rigging (BOOM VOC)
Calculate the required minimum crane capacity for each crane where two cranes are used to lift
a 35 tonne beam and the sling pints are located at equal distance from each end? - ANS-35t
divided by 2 = 17.5 x 20% = 21t Each crane must have a capacity of 21t at the required radius
\How would you determine the fleet angle for an un-grooved winch drum? - ANS-With of drum 1
meter x 19 (factor) x 0.5 (half the with of the drum) = 9.5, So the sheave must be a minimum of
9.5 m from the drum
\Is a person with a basic rigger certificate allowed to supervise dual crane lifts? - ANS-No
\What are some of the effects of working with fleet angles greater than allowed under the
standards? - ANS-Increased rope wear and sheave wear as well as uneven spooling
\What factor would you apply in determining the minimum capacity requirement for cranes,
slings etc for use in a dual crane lift? - ANS-20% reduction for each crane
\What is the maximum fleet angle allowed for a grooved drum? - ANS-5 degrees or 1 in12 factor
\What is the minimum amount of clearance required between the top layer of rope and the rim of
the flange of a winch drum? - ANS-A minimum of two full turns on the winch drum
\When rotating a load using the main and auxiliary hooks on a single crane, how ` much weight
must the whip line or auxiliary hook be capable of carrying? - ANS-20% less than its rated
capacity
\When rotating a load using two cranes, how much weight must the primary crane be capable of
carrying? - ANS-100% of the load
\When transferring a load from a crane hook to a chain block (say in a building) how much side
angle from the line of the boom would you allow? - ANS-0 degrees
\When transferring a load from one chain block to another, how would you determine the
maximum angles you would allow for the chain blocks? - ANS-60 degrees
\When using more than one crane for a lift, how many crane motions would you direct at any
one time? - ANS-One
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Calculate the required minimum crane capacity for each crane where two cranes are used to lift
a 35 tonne beam and the sling pints are located at equal distance from each end? - ANS-35t
divided by 2 = 17.5 x 20% = 21t Each crane must have a capacity of 21t at the required radius
\How would you determine the fleet angle for an un-grooved winch drum? - ANS-With of drum 1
meter x 19 (factor) x 0.5 (half the with of the drum) = 9.5, So the sheave must be a minimum of
9.5 m from the drum
\Is a person with a basic rigger certificate allowed to supervise dual crane lifts? - ANS-No
\What are some of the effects of working with fleet angles greater than allowed under the
standards? - ANS-Increased rope wear and sheave wear as well as uneven spooling
\What factor would you apply in determining the minimum capacity requirement for cranes,
slings etc for use in a dual crane lift? - ANS-20% reduction for each crane
\What is the maximum fleet angle allowed for a grooved drum? - ANS-5 degrees or 1 in12 factor
\What is the minimum amount of clearance required between the top layer of rope and the rim of
the flange of a winch drum? - ANS-A minimum of two full turns on the winch drum
\When rotating a load using the main and auxiliary hooks on a single crane, how ` much weight
must the whip line or auxiliary hook be capable of carrying? - ANS-20% less than its rated
capacity
\When rotating a load using two cranes, how much weight must the primary crane be capable of
carrying? - ANS-100% of the load
\When transferring a load from a crane hook to a chain block (say in a building) how much side
angle from the line of the boom would you allow? - ANS-0 degrees
\When transferring a load from one chain block to another, how would you determine the
maximum angles you would allow for the chain blocks? - ANS-60 degrees
\When using more than one crane for a lift, how many crane motions would you direct at any
one time? - ANS-One
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