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11 Cards in this Set
- Front
- Back
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What are the main parts of an EOT crane? |
Bridge Trolley Trucks Tracks |
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When estimating the weight of material, what % of SWL (safe working load) weight is added? |
12% |
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How much is the strength of a rope reduced when a knot, bend, hitch or splice is added? |
Knot or bend = 50% Hitch = 25% Splice =15% |
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Hard lay ropes provide more _______, while soft lay ropes have a higher _______. |
Abrasion resistance
Tensile strength |
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What is the strongest natural fibre used in rope making? |
Hemp, but it degrades to quickly when exposed to moisture so only number one grade Manila is suitable for industrial service |
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What is the formula to find the volume of a ring? |
Volume = (πD^2C) - (πd^2C) |
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When inspecting chain slings or chain for wear, remove from service any portion of the chain that is worn by _____or _____. |
10% or more of the original diameter
The length is more than 3% longer of a new chain |
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What is a hitch? |
A hitch is formed by fastening a rope to an object such as a ring, hook, or post |
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What is a knot? |
A knot is formed when the end of a rope intertwined within a section of the rope |
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What is a bend? |
A bend is formed by intertwining two rope ends, either of the same rope to make one endless rope or two different ropes to make one continuous rope |
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Why would you use a chain sling over a wire rope? |
-withstands rougher use -does not kink as easily -more resistant to abrasion and corrosion -less affected by high temperatures |
