190191d Communications and Trade Specific Safety

What is the single largest contributor to your personal safety?

Your attitude

What is profit?

Income from your customers, minus purchases, salaries and expenses

How is CO (carbon monoxide) a hazard?

• colourless, tasteless, odourless

• When carbon based fuels are oxidized in a chemical reaction and the combustion is incomplete, CO is formed

• Easily absorbed into the bloodstream and displaces oxygen in the bloodstream

• Has a cumulative effect - builds up in your body over a long period of time with repeated exposure

How should a space be ventilated when operating an engine inside?

• having a positive exhaust extraction system (take the contaminated air out)

• and a replacement (make-up) air unit (replaces the air that was taken out, ensuring a negative pressure is not created

What does a wire rope consist of?

individual wires laid into strands that are then laid around a central core

Define right strand lay

wires in the strands are wound in a clockwise direction

Define left strand lay

Wires in the strands are wound in a counter-clockwise direction

Define right lay wire rope

Strands are wound clockwise

Define left lay wire rope

Strands are wound counter-clockwise

What does regular lay mean?

if the direction of the wires in the strand is opposite to the direction that the strands are wound in the rope

Define right lay regular lay rope

Strands twist to the right (clockwise) and the wires within the strands twist the opposite direction (counter clockwise)

What type of wire rope is considered the standard wire rope?

Right lay regular lay

What are lang lay ropes?

The wires and strands are laid in the same direction

What is lay length?

The linear distance measured along the centreline of the rope, for one strand to make a complete revolution of the wore

How is wire rope size determined?

By its length and diameter

How do you accurately measure the diameter of a wire rope?

Must always take its size at the widest point (across the crowns, not the flats)

on a 6-strand rope, you must measure the diameter in three positions

on an 8-strand rope, you must measure the diameter in four positions

How are wire ropes classified?

By the number of strands in the rope and the number of wires in the strands

(EXAMPLE IMPORTANT - 6×19 6 is number of strands, 9 is number of wires in each strand)

What is breaking strength of a wire rope?

The minimum load that causes the rope to fail

What is the correct number of clips that should be used on a wire rope?

3

How should you properly install U-bolt and saddle variety clips?

U-bolt should always be on the dead side, saddle always on the live side.

“never saddle a dead horse”

When knotting the wire rope to secure a tail chain (NOT RECOMMENDED), how much does it reduce the safe working load?

by at least 50%

How much and how often would you lubricate a wire rope?

Lightly and frequently

How can you use your hand to figure out overwound and underwound right and left lay ropes?

For right lay ropes - right hand is used in a fist with the pointer finger upwards. For underwound, have palm facing up a pointer finger indicates which side the rope starts on. For overwound, palm is downwards and pointer finger indicates which side the rope starts on

For left lay ropes - left hand is used and literally the exact same concept

Why is it important to spool the first layer with wraps that are tight and close together?

Forms the foundation for the remaining layers

OHS regulations specify that there must be a minimum of ___ wraps on the drum before a load is applied.

5

Why should you lubricate wire ropes?

reduces friction and wear between the rope’s components and between the rope and drum/sheaves

The most important persons in an equipment repair business are the….??

Customers

What are the five guidelines to follow for a safe working environment while jacking or blocking?

• safety

• floor or ground stability

• load to be lifted or supported

• determining the lift points

• determining the height the equipment needs to be raised

How can the pounds per square inch load on the ground under a jack be reduced?

Placing a large piece of wood under the jack will spread the load over a larger area

At what concentration is CO deadly?

2%

When installing clips on a wire rope, the first clip should be installed where? What about the second clip?

First clip - One base width away from the dead end

Second clip - nearest the thimble

Do clips on wire rope provide full lifting strength?

No

3 methods of lubricating a wire rope

• brush on

• submersion of wire rope

• aerosol dispensers