RIG CH.8 Flashcards
What are parted blocks most commonly used for?
Sag conductors, set poles, and hang pole line equipment
T or F: The manufacturer’s recommended care and inspection criteria only needs to be read once before use and never looked at again.
False, it should be read every time prior to use
Where can you find the weight rating of blocks?
stamped on the hook or shell
When should tensions involved in a rigging application be calculated?
Every time
What happens generally when the number or parts increases in a rigging application?
The force of the load decreases
What are the two main tensions involved with parted blocks?
Haul line and Hook strain
What is the standing block?
The block that is fixed and doesn’t move
What is the running block?
The block that moves
Why is haul line tension calculated?
To verify that WLL is not exceeded for the line and the hoisting mechanisms.
Why is hook strain calculated?
To verify that the WLL of the blocks is not exceeded.
What is a good rule of thumb when calculating friction?
10% friction is calculated
What is the haul line formula?
Haul line = 1.1^P*W/P
What does P stand for in the haul line formula?
Parts supporting load
What does W stand for in the haul line formula?
Weight
When does the greatest amount of mechanical advantage occur?
At two parts
