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65 Cards in this Set
- Front
- Back
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Require audio communication with mobile crane operator when: |
Load out of sight or signal person more than 100 ft away |
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Piece of equipment designed to lift, move and land a load |
Crane |
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All removable parts on a crane should have |
ID plates |
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Considerations when selecting crane capacity |
Dimensions and weight of load, max lift radius, lift height of load, number of lifts and type of lifts |
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Set up/lift area must have how many feet of 360° swing clearance between counterweight and any other object |
2 ft |
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Ground blocking under outrigger floats must be at least how big |
3x larger area than outrigger float |
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Maximum out of grade for ground level for crane safety |
1% (1 ft over 100ft out of level) |
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Cranes rated at what percent of tipping |
85% |
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Load indicator, rated capacity indicator or rated capacity limiter must be installed on a crane with what max capacity |
3t or higher |
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Diagram shows safe approved working areas of crane |
Quadrant of operation diagram |
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What is considered the load on a mobile crane |
Anything below boom tip, including length of wire rope, block, headache ball etc. |
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What to do when measured load radius fall between 2 given on load chart |
Round up for safety |
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What to do when boom angle falls between 2 given in load chart |
Round down for safety |
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Radius on mobile crane is from |
Axis of rotation to center of load block |
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IWRC |
Independent Wire Rope Core |
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Extra extra improved plow grade |
Grade 120/130 and grade 130/140 |
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Improved Plow grade |
Grade 110/120 |
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Extra Improved Plow grade |
Grade 115/125 |
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Mild Plow grade |
Grade 90/100 |
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Plow grade |
Grade 100/110 |
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What direction and lay is this rope |
Left regular lay |
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What direction and lay is this rope |
Left lang lay |
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What direction and lay is this rope |
Right lang lay |
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What direction and lay is this rope |
Right regular lay |
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This lay has wires laid in one direction and strands laid in opposite direction |
Regular lay |
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Type of wire rope has core strands laid in one direction and putter strand laid in the opposite direction |
Rotation resistant rope |
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Strands and wires in class 6x19 |
6 strands, 16-26 wires/strand |
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What class of wire most diverse with good abrasion resistance and flexibility |
6x19 |
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This style of wire rope requires more frequent inspection due to tendancy of internal wire breakage |
Rotation resistant wire rope |
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What can happen when using rotation resistant wire rope in a wedge socket |
Internal core slippage |
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Wire rope diameter measure where |
Across widest point or "crown" |
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How many measurement should be taken on a wire rope to check it's diameter |
1/2 the # of strands. (3 measurements on a 6 strand wire rope) |
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What is the 3/6 rule |
Replace if 3 broken wires in one strand or 6 broken wires randomly distributed over one lay length |
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How much can diameter of wire rope be reduced before it needs to be replaced |
1/3 |
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Method used to bind end of rope to prevent unraveling |
Seizing |
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How many numbers of seizing should be applied to a rope |
3x diameter rounded up |
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Space between seizings |
2x rope diameter |
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Length of seizing |
1-1 1/2 x rope diameter |
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What is the fleet angle |
Angle from the center of the working sheave to the outside wire wrap on the drum |
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Maximum fleet angle in grooved drum |
2° |
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On a smooth drum the fleet angle should not exceed |
1.5° |
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How many full wraps of wire must remain on the drum |
2 |
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How many rope diameters should the flange on the drum protrude past last wrap of wire rope |
2 rope diameters or 2.5" |
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Maximum layers of ropeon a drum to prevent crushing of wire rope |
3 |
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WLL of wire rope |
5:1 |
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If load suspended on tugger hoist for extended time what must be installed in addition to the brake |
Ratchet and pawl system |
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Shackles are sized by |
Diameter measured at the bow section |
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Breaking strength formula |
Rope diameter squared × breaking strength of 1" diameter rope (42t) |
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Elevator WLL |
20:1 |
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D/d with ratio of 1:1 has a strength loss of |
50% |
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Minimum D/d ratio for full strength rating in a basket hitch |
25:1 |
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Basket hitch rated capacity compared to a single vertical hitch |
2x strength |
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What happens if both sling eyes in a basket hitch go to the same hook |
It loses capacity |
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Choker hitch rated at what % of single verticle hitch |
75% |
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This type of sling material resists alcohols, aldehydes and hydrocarbons but cannot be used with acids |
Nylon |
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This type of sling material can be used in acidic conditions |
Polyester |
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Nylon sling stretch factor is |
20% |
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Does nylon or polyester stretch more under load |
Nylon |
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Maximum temperature when using nylon or polyester slings |
200°f |
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3 safety features in a twin round sling (grommit) |
1)Fiber optic tell-tales 2) Inner core colored differently then outside 3) Overload indicator tails that can't be seen anymore if sling is overloaded |
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Increase of load on each sling when lift angle is 60° |
115% |
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Increase of load on each sling when lift angle is 45° |
141% |
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Increase of load on each sling when lift angle is 30° |
200% |
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The rule for softeners on sharp corners is that every contact point must be how long? |
1 lay length or 7× rope diameter |
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What is the recommended safe working angle for slings |
60° |
