Derricks

Scope

Applies to guy, stiffleg, basket, breast, gin pole, Chicago boom and A-frame derricks of the stationary type, capable of handling loads at variable reaches and powered by hoists through systems of rope reeving, used to perform lifting hook work, single or multiple line bucket work, grab, grapple, and magnet work.

Regulatory citations

Key definitions

• Crane: An apparatus used to lift and move equipment.
• Derrick: An apparatus consisting of a mast or equivalent member held at the head by guys or braces, with or without a boom, for use with a hoisting mechanism and operating ropes. A derrick differs from a crane in that is has a stationary mast, a movable boom, and rises from the base.
• Designated: Selected or assigned by the employer or the employer’s representative as being qualified to perform specific duties.

Summary of requirements

In general, the standard requires the covered employer to:

• Designated personnel. Only allow designated personnel to operate a derrick.
• Safe operating practices. Sling use must follow safe operating practices.
• Rated load marking. Provide for permanently installed derricks with fixed lengths of boom, guy, and mast, a substantial, durable, and clearly legible rating chart affixed where it is visible to personnel.
• Inspection. Inspect derricks prior to initial use and also frequently and periodically to insure compliance.
• Operational tests. Test prior to initial use all new and altered derricks to insure compliance
• Rope inspection. Perform an inspection of all ropes in use (and ropes idle for a month) at least once a month and a fill out a certification record.
• Before starting to hoist, ensure that the following conditions occur:
  • Multiple part lines are not twisted around each other.
  • Hoist rope is not kinked.
  • The hook is brought over the load in such a manner as to prevent swinging.
• During the hoist, ensure that:
  • There is no sudden acceleration or deceleration of the moving load.
  • The load does not contact any obstructions.
• Test the brakes each time a load approaching the rated load is handled by raising the load a few inches and applying the brakes.
• Avoid carrying loads over people.
• Never lower the load below the point where less than two full wraps of rope remain on the hoisting drum.
• The operator must never leave his/her position at the controls while the load is suspended.