Rigging (110101e) Flashcards
A right lay rope has ?
Strands twisted to the right
Yarns twisted to the left
The strongest synthetic fiber rope is?
Nylon
Safe working load is the?
Breaking point divided by the safety factor
The type of knot or bend used for tying two ropes of different diameters together is the?
Sheet bend
A knot in a rope does what?
Decreases the rope strength by 50 percent
What is rigging defined as?
The bringing together of various lifting devices to raise or lower materials or equipment
What are the two categories of Fibre rope construction?
Twisted ( laid)
Braided
Are synthetic Fibre ropes stronger than natural Fibre ropes?
Yes
Fibre rope overloading should never exceed?
10 to 1
What is a figure of eight knot for?
Tying two rope ends of equal length
What is a sheepshank knot for?
To shorten up excessively long ropes
Slings should not be used lower than what angle?
60 degree
A crane is capable of its heaviest lifts when?
It’s boom is very near to vertical
The type of chain hoist most suitable for horizontal pull?
A come along
What are the two types of synthetic Fibre rope most commonly used?
Nylon
Polypropylene
What is the most popular rope available?
Polypropylene
What is another name for chain hoists?
Chain falls
What are some different knot types?
Bowline
Sheep shank
Figure 8
Sheet bend
What does shock loading mean?
This is when a load is dropped and caught by the rigging or when there is an uncalled for strain on the load
How is mechanical advantage calculated with block and tackle?
By counting the ropes between
A splice in a rope does what to the rope?
Reduces strength by 20 percent
How are wire rope slings made?
From one piece that is looped and twisted together with a thimble on end
What increases a mobile cranes stability?
Outriggers
When does OH&S require you to check rigging?
Before every shift
When must wire ropes be replaced?
When they are kinked or have 1/3 of the original diameter worn away
What are the two main types of cranes?
Tower cranes
Mobile cranes
How is the lifting capacity identified on synthetic fiber round sling?
By color coded non load bearing cover placed on the sling
