Dealing With Problems And Advanced Lifting Techniques Flashcards
What would happen if the wire rope was not tightly and evenly wound
Severe rope damage
What are nine of the more common causes of poor drum winding and slack rope
Rope incorrectly installed on the drum Incorrect fleet angle Rope is too stiff for the crane Sheaves poorly lubricated or stiff due to cold weather Effect of wind on hoist line Suddenly stopping a load during hoisting Hook block or headache ball too light Sudden change in rope tension Overlowering
What is the maximum fleet angle on a grooved drum
2 degrees
30:1 ratio
What is the maximum fleet angle on a smooth drum
- 5 degrees
40: 1 ratio
What is the ratio for fleet angle based on
Half the drum width and the distance from the drum to the deflector sheave
If the rope Is to stiff for the crane what could the two causes be
The cable requires a larger diameter drum in order to curve around the drum properly
The cranes drum requires a more supple cable capable of bending more easily
What can you do to prevent damage caused by improperly lubricated or stiff from the cold sheaves
Ensure you boom down and check your sheaves at your boom tip and your block, look for lack of grease blown bearings and foreign objects
I cold weather is the culprit try to warm up our sheaves prior to lifting by running the line out and in slowly
A sudden change in rope tension will cause the rope to slacken momentarily and can loosen the coils or cause cross coiling. What are two instances where this is more prone to happen
When trying to lift out of ice and the ice let’s go
When lifting a cut portion of steel but the slag has re glued the steel
What are three possible outcomes of overloading a crane
Tip it
Collapse or break it
Lose the use of a component
Tipping failure will occur when overloading your crane in the stability portion of your charts. This can happen if you what
Lift a load that is too heavy
Boom down out of chart
Boom out out of chart
Swing from high side to low side in an unlevel crane
Structural failure will occur when you overload the crane in the structural chart this can happen if you what
Lift a load that is too heavy Boom down out of chart Boom out out of chart Take a heavy load "on the boom" Have de-synchronized boom sections
When do you need a competent signal person while working around power lines
If any part of the crane or load may encroach upon the minimum safe approach distance. A work area definition system may also be used to prevent encroaching on the MSAD
There are six main requirements of site supervision when working around power lines or when an incident occurs. What are they
Provide a qualified signal person
Be aware of the requirements of the electrical authority
If travel will be repeated then a route will be plainly marked under the power lines with rider poles
Ensure that where necessary the crane is grounded
Report every incident involving contact with power lines to the site safety inspector
If contact is made not use the crane until it has been completely inspected by a competent person
When planning your work near power lines what should you use to ensure you maintain a safe distance
Table 4 from z-150
Who must contact the power line operator and when
The client must contact them before work is done or equipment is operated within 7 meters of an energized overhead power line.
