LINE E3 Flashcards
the distance a crane must be from power lines if the lines are charged with 750-75,000 Volts?
3m
the distance a crane must be from power lines if the lines are charged with 75,000-250,000 Volts?
4.5
the distance a crane must be from power lines if the lines are charged with over 250,000 Volts?
6m
turnbuckles have witch threads and a sleeve?
left hand and right hand threads
what is a turnbuckle Jaw end?
a U joint with a pin
at what angle are eye bolts able to with stand?
45 degrees but no more
what is the throat of a shackle?
the round part for the rope end
when are shackles used?
when two or more ropes are place on a hook
what must you never do with a shackle?
replace the Pin with an ordinary bolt
the pin end of a shackle should always be the ___ end
hook end never sideways
the space between cable clips is how far?
6-7 rope diameters
correctly installed cable clips reduce the breaking strength by ___ if correct it is increased by ___
20% less and 50% more
what should be used for transporting steel pipe by crane?
Choker hooks and if long pips then a spreader beam
what is a bridal hitch?
two or more ropes or slings used too support the load
if using 4 ropes what is lifting the load?
only two the other two are to stablize
what is the necessary incline angle for a basket hitch?
60 degrees from the bottom of the load
how wide should rollers be?
75mm
pulling device that uses chain or cable?
come-along
An apparatus capable of long, continuous lifts
Tirfor Jack
Tirfor Jacks can be made to move in the opposite direction by
relocating the pipe handle to the other lever
Tirfor Jacks use
Wire rope
Wire ropes must be replaced when
6 or more broken wires in a rope lay or 3 broken wires in one strand or if wires broken at attached fittings
what is Peening?
when the rope becomes flattened from rollers or other wear and becomes brittle
What is scrubbing?
displacement of wire strands
what is bird caging?
the wire rope gets twisted backwards and the strands open up and separate causing a space in the rope
what is the proffered rope for a tag line?
Polypropylene because it doesn’t conduct electricity and is inexpensive
what knot should be used to attach a tag line to a load?
Bowline
1 bell or flash (crane)
STOP
2 bells or flashes (crane)
RAISE
3 bells or flashes (crane)
LOWER
4 bells or flashes (crane)
ALL CLEAR
slings and ropes for hoisting should always be at least ___ degrees or more from horizontal
60 degrees
which gloves should not be used for safe handling of materials?
gauntlet type gloves
