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821 Cranes and Derricks Safety II
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Derricks

Operational Aids

The operational aids requirements listed in OSHA 1926.1416 apply to derricks except when:

  1. a boom hoist limiting device (required by OSHA 1926.1416 for other equipment) is not required for derricks, and
  2. alternative requirements to those in OSHA 1926.1416 are specified for boom angle or radius indicators and load weight/capacity devices.

Boom Angle or Radius Indicator

This device is not required, but if the derrick is not equipped with a functioning one, the employer must ensure that either:

  • The boom hoist cable is marked with caution and stop marks. The stop marks must correspond to maximum and minimum allowable boom angles. The caution and stop marks must be in view of the operator or a spotter who is in direct communication with the operator; or
  • An electronic or other device that signals the operator in time to prevent the boom from moving past its maximum and minimum angles, or automatically prevents such movement, is used.

Load Weight/Capacity Device

Derricks manufactured after November 8, 2011 with a maximum rated capacity more than 6,000 pounds must have at least one of the following:

  • load weighing device
  • load moment indicator
  • rated capacity indicator
  • rated capacity limiter

Knowledge Check Choose the best answer for the question.

7-6. What must the employer ensure if a derrick is not equipped with a functioning boom angle or radius indicator?