3640444
Description
Flashcards by Vincent Bergeron, updated more than 1 year ago
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Created by Vincent Bergeron
over 8 years ago
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| Question | Answer |
| What is the SWL? | Safe Working Load |
| What is a rule of thumb for calculating the SWL of wire rope? | 3/8" thick rope = 2000lbs (1 ton) every 1/8" larger adds 2000lbs (1ton) |
| Safe Work Load in Tons for Wire Rope with a safety factor of 5 | SWL = D² x 8 |
| How much can a knot reduce the breaking strength of fibre rope by? | 50% |
| How much can correctly attached cable clips reduce the breaking strength of wire rope? | 20% |
| What should you do with sharp corners on a load and why? | Have padding or soft corners in place to reduce abrasion on the rope |
| What does a basket web sling look like and what is it used for? | It has metal triangles of equal size at each end of the webbing |
| What does a choker web sling look like and what is it used for? | It has a larger triangle containing a slot at one end and a smaller triangle at the other end |
| What is a metal mesh sling and what is it used for? | A sling made of metal mesh. used when a load is too abrasive or hot for synthetic webbing. |
| What is the formula for the SWL of a basket hitch? Give some examples! | SWL x H/L x 2 SWL of a sling is rated 2000 H= 3ft L= 5ft SWL=2000lbs x 3/5 x 2 = 2400lbs |
| What is the formula for the SWL of a two-leg bridle hitch? How does it differ from a basket hitch? | SWL x H/L x 2 It uses the same formula as the Basket Hitch but use the shortest length hitch when doing the calculation. |
| If a choker hitch angle is over 45 degrees, what formula do you use to calculate the SWL? Give an example! | SWL x 3/4 SWL=2000 x 0.75 = 1500lbs |
| If the choker angle is 45 degrees or LESS, what is the formula to calculate the SWL? Give an example! | SWL x H/L SWL of a sling is rated 2000 H= 3ft L= 5ft SWL=2000 x 3/5 = 1200lbs |
| If you use chokers in pairs, horizontally, how do you calculate the SWL of these kind of sling configurations? | SWL x A/B x H/L x 2 |
| What is a double basket hitch and how do you calculate its SWL? | Two Basket Hitches used to lift a part. SWL x H/L x 4 |
| What is the approximate weight of a cubic foot of steel? | 500Lbs |
| What is the approximate weight of a cubic foot of wood? | 35Lbs |
| What is the mechanical advantage of the block ? | The ratio of Load to Effort. Used to lift heavy loads using a small amount of effort. |
| What are the essential parts of any block? | Shell Sheaves Center pin Straps Becket |
| What do each of the parts of a block do? | Shell: Provides protection for Sheave Sheaves: transmit the load imposed by the rope to the center pin. |
| What are the sheaves normally made of on fibre rope blocks? | Cast iron |
| Why are fibre rope sheaves NOT used with (rope-wise) and why? | Rapid rope damage will result |
| what is a double basket hitch? Why is it used? | Loads that require support from underneath are lifted with two basket hitches. |
| What is a single vertical hitch? | A single leg of sling material with a hook and an eye at each end |
| What is a Bridle hitch? | Two three or more legs can be used together to form a bridle hitch |
| What is a single basket hitch? | A single length of sling material passed through a load |
| What is a double wrap basket? | The sling is wrapped completely around the load |
| What is a single choker hitch? | A single sling is hooked back to itself just above the load |
| What is a double choker hitch? | Two single chokers used to lift a load that require level lifting |
| What is a Double-wrap choker hitch? | The sling is wrapped completely around the load and hooked back to itself just above the load |
| What is an endless sling? | A sling that is joined at both ends to create a loop. |
| What is a synthetic web sling? What are its advantages and disadvantages? | Slings made of synthetic material. They are soft, which protects the loads they are lifting from being scratched by the sling. Heat and friction damage them. |
| What are the differences between the endless, standard eye, and twisted eye synthetic web slings? | Endless: a sling connected to itself, forming a loop. Standard eye: A sling with a loop at each end. Twisted eye: A sling with a loop at each end that is twisted. |
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