Pipefitter Rigging and Hoisting Operations 2

Question 1

What is the 'D/d ratio' in rigging, and what does a higher ratio indicate?

Accepted Answer

The ratio of wire rope drum or sheave diameter to rope diameter; a higher ratio means less wire fatigue and longer rope life

Answer

The ratio of dead load to dynamic load on a rigging system

Answer

The ratio of downward force to diagonal force in a sling angle calculation

Answer

The ratio of drum diameter to hook diameter on a hoist

Question 2

What does 'proof load' mean for rigging hardware?

Accepted Answer

A test load applied to hardware before service to verify it can handle its rated capacity without permanent deformation

Answer

The maximum load a rigging component can theoretically support before breaking

Answer

The working load limit divided by the safety factor

Answer

The load applied during hydrostatic testing of pipe

Question 3

What is the maximum angle from vertical that a two-leg bridle sling should form before the WLL is reduced to account for increased leg tension?

Accepted Answer

45 degrees from vertical (90-degree included angle)

Answer

60 degrees from vertical (120-degree included angle)

Answer

30 degrees from vertical (60-degree included angle)

Answer

There is no angle limit if the WLL of each leg is not exceeded

Question 4

What is a 'tagline' used for during crane lifts of pipe or equipment?

Accepted Answer

A rope attached to the load to control rotation and horizontal movement during the lift

Answer

The safety line attached to the crane boom to prevent over-extension

Answer

The load rating tag attached to every rigging component

Answer

A line used to manually measure the lift height

Question 5

What is the primary purpose of a 'load cell' used during rigging operations?

Accepted Answer

To measure the actual weight of a load in real time during lifting

Answer

To test the breaking strength of slings before use

Answer

To detect moisture inside rigging wire rope

Answer

To measure the electrical load on the crane motor

Question 6

Before a crane or hoist is used, what inspection must be performed according to ASME B30.2 and OSHA 1926.550?

Accepted Answer

A pre-operational (shift) inspection by the operator, checking controls, brakes, hooks, and warning devices

Answer

A full annual certification inspection by a third-party inspector

Answer

A load test to 125% of rated capacity

Answer

A lubrication service of all sheaves and drums