1B mass hoisting questions and solutions

1B mass hoisting questions and solutions What is the leading cause of death in crane work? Electrocution What can you exceed the cranes load range? Never What OSHA Regulation govern crane operations? 1926.550 What ASME Regulations govern crane operations? B30.5 What is OSHA's definition of a crane's function? To hoist and swing loads at various radii Whats is the most common maximum crane loading safety factor? 85% Why do we need standards? To assure that everyone goes home in the same condition they came in Which condition is an example of "structural" failure? When the boom breaks What percentage of tipping is a crawler cranes stability rated at? 75 The point at which a crane tips is called Tipping axis According to Massachusetts regulations as it pertains to hoisting equipment devices to prevent the boom from falling over backward shall be considered adequate for this purpose? False What are two main factors that limit the capacity of modern day cranes Structural strength and stability What is the major reason for most mobile crane accidents? Poor operation When are you required to use cranes outriggers? When the operators manual or load chart specifies that you need them Under what circumstances can you lift the crane off the ground with the outriggers? When the operators manual says you can Can a boom bend(deflect) under normal operating conditions? Yes What does swing mean? To rotate the upper structure of the crane If a hydraulic hose ruptures, should you expect the boom to come crashing to the ground? No What is the minimum wraps of line that OSHA says that you must have on the drum? 2 What does a swing break do? It stops the upper structure from rotating According to Massachusetts regulations as it pertains to hosting equipment each crane shall be equipped with a mechanism which will cause the boom swing to be Started and stopped in a manner sufficiently gradual to prevent damaging effects of torsion on the crane It is not specifically required that an operator is to be protected with a cab when exposed to overhead hazards False What does it mean to two-block a crane To run the load block into the boom tip sheaves(upper block) The rated capacity of each load hook is Stamped on the hook What is one lay of rope? The length of rope measured by one turn of the strand What is the minimum number of broken wires that will condemn a running rope? 3 If a running rope gets crushed, is it out of service? Yes, Always How far can a hook twist before it gets condemned? 10% How big should a boom tip sheave be? 18 times the diameter of the rope If a load is lifted using a 4 point sling how much of the weight is carried on each leg? One third of the weight What's the basic rule of thumb when using wire rope clips? Never saddle a dead horse If a rope has a CBS of 15,000 lbs and a design safety factor of 5, what is it's capacity? 3,000 Lbs When attaching clips to a wire rope you should..... Never stagger the clips and ensure that the u-bolt of all clips are on the dead end of the wire rope What is the term called when the ultimate strength of an object is divided by the safe working load of that object? Safety factor A right regular lay rope is designed as one in which the Wires twist to the left and the strands twist to the right When shall wire rope be taken out of service that is used as running rope for hoisting 3 Broken wires in one strand in one rope lay When may chains be used as slings? The chains may only be used as slings so long as they are in accordance with 29 CFR 1926 Using undersized wire rope will Flatten the rope and cut a groove in the sheave A lang lay rope is designated as one in which the Wires and strands twist in the same direction