Week 4 Flashcards
What are parted blocks most commonly used for?
Sagging conductors
Setting poles
Hanging pole line equipment like transformers
Where will the weight rating for parted blocks be found?
Typically stamped on the hook or shell
What are the names of the upper block and lower block in a set of parted blocks?
Upper block – standing block
Lower block – running block
Why is hook strain calculated?
To verify that the working load limit of the blocks are not exceeded.
What are snatch blocks used for?
To redirect the pulling forces or tensions on a rope.
How do you calculate snatch block tension?
Line out x angle factor.
What is a good rule of thumb for calculating friction in parted blocks?
For every sheave a rope passes through 10% friction is added to the weight applied to the rope.
Why is haul line tension calculated?
To verify that the working load limit of the rope and the lifting device is not exceeded.
How do parted blocks provide a mechanical advantage when lifting a load?
The weight of the load is therefore divided among the parts that support it.
What are the common components of parted blocks?
Hook and safety latch Swivel Shell Center pin Becket Sheaves
