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55 Cards in this Set
- Front
- Back
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What is the construction of wire rope |
Small wires wound around a small core create a strand. Normally 6 strands are wound around a steel or fibre core |
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What is the criteria for use of wire rope |
Crush resistance Abrasion resistance Flexibility Strength Lay Environment |
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What is breaking strength |
Force needed to break the rope |
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Define fibre core |
Made from Sisal , polyester, or other synthetic material |
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Define independent wire rope core |
Another strand of the rope as core, or steel |
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Define lay |
Directions in which the strand of rope are twisted together |
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Define Lang lay |
Strands twisted in same direction. Core design is the same as regular lay. It's more flexible and more contact with the drum spool |
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What are the wire rope classifications |
The number of wires per strand The number of strands The type of core The lay |
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How do you measure the wire rope size |
Across the greatest diameter. Strand to strand not flat side |
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What is the sling size for one ton |
3/8 |
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What is the drum to cable ratio |
20:1 20 in of drum for 1 inch of cable |
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What is the shive to cable ratio |
10:1 |
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Never use less than 3 wraps around a drum. True or false |
True. Friction holds it on |
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Define fleet angle |
From centre to where cable is pulling from. 2 degrees on groove and 1/2 deg. On smooth drum |
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When inspecting cable for wear where do you look? |
Top surface for broken strands on cross over parts. Common bend points |
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How do you look for broken cables |
Use a cloth and run down the cable fiber stick to the broken wires do not use hands manufacturer gives the amount of broken wires you're allowed typically 10 wires in one lay length or 5 broken wires in one strand |
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What are natural fibre ropes made of |
Hemp |
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What are the advantages to nylon rope |
Nylon rope is very strong and elastic it is used when shock loading is, nor when a rope needs to be smaller than a hemp one but of equal strength |
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What are the disadvantages of nylon rope |
It gets Slippery When Wet loses a little bit of strength and won't hold knots it expands it is affected by paint linseed oil and acids |
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What is the max temperature for polyester rope |
200 degrees then will melt |
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What is the working strength for new rope |
One fifth of its breaking strength |
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What is the only grade of chain that is acceptable for overhead hoisting |
Grade A |
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How do you measure chain |
The diameter of the link (side) |
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What is a grade |
It's the type of Steel what's in it and what is done to it and the heat treatment |
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What temperature should chains be removed from service |
Over 1000 degrees. 900 degrees and less they lose 10 to 15 percent of strength. Do not cool immediately |
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How can you tell if a chain is stretched |
Chain is designed with gap between the links if you cant wiggle your chain it's stretched |
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What happens if a clamp or ubolt is put on backwards |
It reduces the strength by 40% |
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What is the purpose of an eye or thymbol |
It protects the cable from sharp Kinks that can weaken it protects it from being flattened or crushed and from wear |
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What is the purpose of a headache ball |
To add weight to the load to help find center of gravity |
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How do you size a shackle |
Shackles are sized by the diameter of the steel in the bow section |
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Define Shear strength |
It is forces working away from each other |
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What are shoulderless eye bolts used for |
Shoulderless eye bolts are used for vertical loading but as soon as it's loaded at an angle the safe working load is severely reduced |
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When lifting with eye bolts always use a shackle and ensure that the lifting angle is above what degrees |
45 degree |
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What do you apply to hooks without safety latches |
Mousing |
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What are spreader beams used for |
Spreader beams are usually used to support long loads during lifts they remove the risk of the low tipping sliding or bending compressive Force |
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What are equalizer beams used for |
Equalizer beams are used to equalize a load on sling legs and keep equal loads on dual voice lines when making tandem lifts its a bending forced for an unbalanced load it is engineered designed |
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Why do you use for slings when using a bridle hitch |
When a bridle hitch has more than two legs you cannot assume that all legs or sharing a load equally regardless of the total number of legs the full weight of the load might be shared by only two legs the other legs maybe Simply Be balancing the load two for balancing and two for taking the weight of the load |
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What angle should a double basket hitch never go above and why |
60° because this will prevent the legs from sliding towards each other use longer slings to spread the legs apart without having the legs and an excessively low-slope |
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What do you use a double wrap basket hitch for |
Lifting pipe |
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What is a tattletale |
A tattle-tale is some form of material extending from the sling telling the operator that the sling has been stretched if the material completely disappears from the sling you know it is past its extension it is also used on elevators and harnesses |
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How much is a knot reducing the Rope strength |
50 % |
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How small must a Nick be in a chain to be able to continue to use |
The Nick must be under 10% of the chain 90% of the width of the chain must be remaining. 5% on the sides |
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What is a critical lift |
When angles are under 30 degrees or an operator must use one hand |
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What is a working load limit |
Max the sling can lift |
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What is the approximate weight of a cubic foot of Steel |
500 pounds per cubic foot |
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What is the approximate weight of a cubic foot of wood |
35 |
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How much does one gallon weigh of water |
8.35p |
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How much is 1 cubic foot of water |
62.43p |
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Which is lighter oil or water |
Oil |
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What is a hydraulic crane. And examples |
It uses fluid power to raise and lower the load and to extend and retract the boom an example as a boom truck which consists of specialist rank truck chassis with a hydraulic boom usually mounted behind the cab two sets of stabilizers increasing the crane stability when hoisting is also used for transporting equipment as a conventional Truck. There is also an industrial crane in must be running on a good surface they are often designed low to the ground so they can pass under obstacles they also have front and rear wheel steering and a transport deck There is a rough terrain crane it has oversized tires and is designed for rough ground that has a hydraulic telescopic boom |
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What is a conventional crane |
Conventional creams use mechanically driven by cable hoists, made up of a lattice structure. Assembled at job site and transferred in parts. Fixed tracks and rotating live. Jib can be added for length. Auxiliary line is a whip line |
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What is blocking |
Blocking is spreading the weight out material it is usually wood that you place under the floats to increase the support area the force that a crane generates on its own Outriggers is substantial as the Boom is Swun the entire load of the crane can be transmitted to 1 Outrigger the flow area is small so huge amount of pressure is exerted on the small area there must be no spaces |
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What are important things to remember when using blocking |
You must use All 4, You Must fully extended it, and the tires must be off the ground |
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What is the minimum limit approach for being next to power lines |
10 feet |
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All ropes conduct electricity true or false |
True but dry polyester ropes provide the better insulation properties synthetic fiber sling should be used whenever possible |
