Boom Hoist Safety Systems

Questions and Answers

What is the purpose of the locking device in the boom hoist system?

To prevent inadvertent lowering of the boom. (correct)

To enhance the speed of the hoisting operation.

To automatically adjust the rope tension.

To provide a visual indicator of load capacity.

What minimum capacity must the boom hoist drum have regarding rope wraps?

Not less than two full wraps of rope. (correct)

At least one wrap of rope.

Only the first layer of rope is necessary.

A minimum of three full wraps of rope.

What is required for the hoist brakes when using power-operated systems?

They need to be manually adjusted at all times.

They should only engage after the load is lifted.

They must have continuous mechanical linkage.

An automatic means must be provided to prevent load falling. (correct)

How much should the drum flange extend over the top layer of rope during operation?

A minimum of 1/2 inch or one-half rope diameter, whichever is larger. Signup and view all the answers

What is necessary to ensure the rope clamp is secured correctly?

It should be tightened to the manufacturer's recommended torque. Signup and view all the answers

What is the primary function of brakes and clutches in the context of load hoist drums?

To control the motion of the load hoist drums Signup and view all the answers

Under what conditions is power-controlled lowering usually necessary?

When near maximum load capacity is being lowered Signup and view all the answers

Which of the following factors does NOT affect the maximum load capacity while using load hoist drums?

Thermal capacity of the braking system Signup and view all the answers

What is the recommendation regarding rope capacity for load hoist drums?

It should match the manufacturer's specifications for recommended rope size Signup and view all the answers

Regarding boom hoist reeving, which statement is true?

It is essential to follow the manufacturer's recommendations Signup and view all the answers

Study Notes

Boom Hoist and Load Hoist Mechanisms

A locking device or system is mandatory to prevent unintentional lowering of the boom.
Hoist drum diameter must ensure the first layer rope pitch diameter is at least 10 times the rope's nominal diameter.
The boom hoist drum must be capable of supporting the boom from horizontal to maximum angle using recommended reeving and rope diameter.

Rope Wrap and Anchor Requirements

At least two full wraps of rope must remain on the drum when the boom is lowered.
The rope end should be securely anchored by either a clamp on the drum or an approved wedge socket arrangement.
Ensure the rope clamp is tightened to the manufacturer's recommended torque specifications.

Drum Flange Specifications

Drum flange must extend a minimum of 1/2 inch (13 mm) or half the rope diameter over the top layer of rope during operation.

Load Hoist Brakes

Power-operated brakes that lack a continuous mechanical link between actuation and braking must have an automatic safety feature to prevent load descent if brake power is lost.
Brakes and clutches should be adjustable to account for lining wear.

Load Control and Capacity

Brakes must be of appropriate size and thermal capacity to manage maximum load capacity without exceeding the manufacturer’s rated capacity.
Any adjustments in operation, such as boom length changes, rigging weight alterations, or reductions in effective counterweight, must adhere to the original specifications.

Travel Control and Safety Features

Travel controls must be conveniently positioned at the operator's station for easy access.
Brakes or locking systems must secure the machine on level grades and while stationary on steep grades, maintaining their engagement during pressure loss.

Rope Specifications

Hoist ropes must be constructed for side boom tractor service; avoiding the use of rotation-resistant rope.
End terminations must comply with specifications from the side boom tractor manufacturer, ensuring safety and reliability.

Description

This quiz focuses on the safety measures associated with boom hoist systems, including locking devices and the specifications for load hoist drums. Test your knowledge on the operating capacities and requirements needed to prevent inadvertent lowering of the boom.