What are the hand signals for a crane?

Use Whip Line (Auxiliary Hoist): Tap elbows with one hand; then use regular signals. Raise Boom: Arm extended, fingers closed, thumb pointing upward. Lower Boom: Arm extended, fingers closed, thumb pointing downward. Swing: Point with a finger in direction of swing of a boom.

When giving the signal the Signalperson must watch the crane for two blocking?

signal, the signalperson must watch the crane for two-blocking. Raising the boom decreases the load radius, which increases the load capacity of the crane. The? signal should be given if the load must remain at a constant elevation and move horizontally closer to the crane as the boom is raised.

What is Reeving on a crane?

A wire rope reeving system is a system whereby the material has been placed through a hole, ring, pulley, block or some other device so as to increase the mechanical advantage that it has.

What is the first element of voice signals given to a crane operator prior to the lift?

What is the first element of voice signals to a crane operators prior to the lift? Function and direction.

Who can signal a crane to stop during a lift?

Qualified and trained signal persons must be present before the lift. Only one person should be giving signals to the crane operator unless it is an emergency stop situation – anyone can give the emergency stop signal to the crane operator.

What is two blocking a crane?

Two-blocking occurs when the operator extends the boom on a crane without letting out sufficient slack in the cable. As a result, the stabilizing weight, called the headache ball, will be popped off by the extending boom.

Who should give signal to crane operator for lifting?

As the eyes and the ears of a dedicated area or crane, a crane hand signal person carries many responsibilities. Before a person can direct the operation of a crane they must first undergo formal training and complete a qualification in crane signaling.

When should the radios be used to signal a crane to be tested?

(2) must use an equally effective method of identifying which crane/derrick the signal is for. (a) The device(s) used to transmit signals must be tested on site before beginning operations to ensure that the signal transmission is effective, clear, and reliable.

What is sheave in crane?

The sheave is a grooved wheel that is used for guiding and holding wire rope. The sheave rotates on a bearing which allows the wire rope to move freely ,minimizing the friction and wear on the rope as well as providing a smooth crane operation.