Term
Outriggers are only to be used in special circumstances
True/False? |
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Definition
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Term
A crane is designed to pick up the same load in all 4 quadrants
True/False? |
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Definition
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Term
Blocks under outrigger floats should be.....
Times the area of outriggers |
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Definition
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Term
Load charts are charts that give the cranes gross capacity under various conditions and situations
True/False? |
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Definition
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Term
A cranes leverage is equal to the crane weight times the horizontal distance from its tipping axis to its centre of gravity
True/False? |
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Definition
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Term
The loads leverage is equal to the load weight times the horizontal distance from its tipping axis to to the loads centre of gravity
True/False? |
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Definition
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Term
A mobile crane is stable when the loads leverage exceeds the cranes leverage
True/False? |
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Definition
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Term
A cranes centre of gravity changes as the upper works rotates
True/False? |
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Definition
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Term
A cranes capacity changes when it upper works move from quadrant to quadrant
True/False? |
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Definition
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Term
A cranes capacity increases as the boom telescopes out
True/False? |
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Definition
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Term
| Overloading a crane can cause: |
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Definition
| Tipping and structural failure |
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Term
| Important considerations before making a lift include: |
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Definition
Radius
Quadrants load will be rotated through
Loads weight
Wind speed and direction,
Load placement |
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Term
A loads chart is not crane specific
True/False? |
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Definition
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Term
| When using the load chart you must know? |
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Definition
Config of crane
Quadrants of operation
Boom length
Boom angle
Load radius
Weight of line,block,ball,etc |
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Term
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Definition
Use of outriggers
Job or boom extensions |
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Term
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Definition
Over the front
Over the rear
Over the sides |
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Term
| AT's capacity can vary from:? |
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Definition
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Term
| AT's boom length can vary from:? |
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Definition
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Term
AT's ability to resist tipping forward
On outriggers:
On tires:? |
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Definition
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Term
RT's ability to resist tipping forward
On outriggers:
On tires:? |
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Definition
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Term
Boom trucks ability to resist tipping forward
On outriggers:? |
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Definition
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Term
| Crawler cranes ability to resist tipping forward |
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Definition
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Term
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Definition
| Stationary load under hook |
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Term
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Definition
Loads change in motion
Ex. Sudden stoping,
Snatching the load |
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Term
| Most blocks on cranes are? |
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Definition
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Term
| If a block is reeved 6 parts, it's a mechanical advantage of |
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Definition
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Term
Sheave diameter rule of thumb
D/d |
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Definition
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Term
| Crane blocks have what on the sides to help down haul the block when unloaded |
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Definition
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Term
If a block has a mechanical advantage of 6:1
The lead line will travel |
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Definition
| 6ft for every 1ft the load is lifted and will travel 6 times as fast |
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Term
| The relationship between a rope sheave and friction is called? |
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Definition
| Efficiency and usually expressed in % |
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Term
| How to calculate lead line pull? |
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Definition
| Weight of load divided by chart ratio= lead line pull |
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Term
Friction loss for
Roller bearings:
Bronze bushings:
Bronze bushed fibre rope |
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Definition
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Term
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Definition
WLL multiplied by Ratio=
Maximum load |
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Term
| Determine parts of line required using ratio chart |
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Definition
D2 times 45 divided by 5= WLL
For IWRC
Total weight of load divided by chart ratio=
Parts of line |
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Term
| When both blocks have the same # of sheaves the becket is attached to? |
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Definition
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Term
| When the # of sheaves varies the becket is attached to? |
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Definition
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Term
| The most popular methods of reeving are: |
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Definition
Lacing
Skip reeving
Square reeving |
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Term
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Definition
It's easy to reeve
Blocks pull close together
No reverse bends |
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Term
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Definition
Rope and sheave speed is faster on one side
Blocks tilt together on one end
Blocks rotate and lines twist together |
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Term
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Definition
Line speed is balanced
Blocks remain more level |
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Term
Skip reeving
Disadvantages |
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Definition
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Term
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Definition
Blocks are balanced
Blocks run smooth and level |
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Term
Square reeving
Disadvantages |
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Definition
The blocks can not be brought close together, this will cause the wire rope to come off the sheaves
Wire rope continually goes through reverse
Bending, this can cause premature fatigue |
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Term
| When is the most weight transferred to the lead crane on a tailing lift |
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Definition
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Term
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Definition
A= NC2 divided by NC1 multiplied by B
B= NC1 divided by NC2 multiplied by A |
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Term
Load on crane one
Load on crane 2 |
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Definition
Nc1
B divided by A+B multiplied by load weight
Nc2
A divided by A+B multiplied by load weight |
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Term
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Definition
Crane one
Crane 2 touch down first
C+D divided by B+C+D multiplied by load weight |
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Term
| What is the number 1 cause of crane accidents? |
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Definition
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Term
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Definition
| Distribute weight of load to 2 cranes |
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Term
By adjusting the crane and or attachment points on the beam it is possible to share the load in any proportion desired
T/F |
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Definition
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Term
| Disadvantages of a EQ beam |
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Definition
Limited rotation
Communication and signalling requires a higher degree of planning and ability |
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Term
| The greatest transfer of load share from the tailing crane to the lead crane occurs when the load is? |
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Definition
| 80-90* from the horizontal |
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Term
| When 2 or more cranes are used to lift one load one -------- person shall be responsible for the operation |
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Definition
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Term
| Who is allowed to deviate from the lift plan? |
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Definition
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Term
| Is a lift plan necessary for a multi crane lift? |
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Definition
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Term
| What could happen if the cranes are not synchronized when making the lift? |
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Definition
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Term
| When operating the crane you should operate it ---------- & --------- |
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Definition
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Term
| Why is there a rule for 75% on multi crane lift? |
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Definition
| Allow for a safety margin |
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Term
| Boom torque is due to what |
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Definition
| Block not centred on the boom |
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Term
| What % of injuries happen when getting on and off the machine? |
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Definition
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Term
The outriggers are the fulcrum point for the crane
T/F |
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Definition
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Term
| At high boom angles much of the load is on |
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Definition
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Term
| The highest loss of capacity when out of level occurs when |
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Definition
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Term
| For high speed duty cycle operations most crane manufacturers reduce the load chart by |
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Definition
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Term
| What must you be aware of when using a crane on retracted outriggers |
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Definition
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Term
| The sweep area is defined as |
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Definition
| The total area the crane can swing over |
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