Boom Hoist Reeving
OSHA 1926.1414 requires that rotation resistant rope may only be used for boom hoist reeving when load hoists are used as boom hoists for attachments such as luffing attachments or boom and mast attachment systems.
When you use rotation resistant rope for such a purpose, you must comply with conditions specified in 1926.1414(e)(4)(ii) below.
Rotation resistant ropes may be used as boom hoist reeving when load hoists are used as boom hoists for attachments such as luffing attachments or boom and mast attachment systems. Under these conditions, all of the following requirements must be met:
- The drum must provide a first layer rope pitch diameter of not less than 18 times the nominal diameter of the rope used.
- The requirements in 1926.1426(a) (irrespective of the date of manufacture of the equipment), and 1926.1426(b).
- The requirements in ASME B30.5-2004 sections 5-1.3.2(a), (a)(2) through (a)(4), (b) and (d) (incorporated by reference, see 1926.6) except that the minimum pitch diameter for sheaves used in multiple rope reeving is 18 times the nominal diameter of the rope used (instead of the value of 16 specified in section 5-1.3.2(d)).
- All sheaves used in the boom hoist reeving system must have a rope pitch diameter of not less than 18 times the nominal diameter of the rope used.
- The operating design factor for the boom hoist reeving system must be not less than five.
- The operating design factor for these ropes must be the total minimum breaking force of all parts of rope in the system divided by the load imposed on the rope system when supporting the static weights of the structure and the load within the equipment's rated capacity.
- When provided, a power-controlled lowering system must be capable of handling rated capacities and speeds as specified by the manufacturer.
Duty Cycle/Repetitive Lifts
You must meet certain criteria when using rotation resistant rope for duty cycle and repetitive lifts. These are defined as follows:
- Duty Cycle: A type of crane service in which bulk material is transferred from one point to another by rapidly lifting, swinging, booming, and placing the material. Typical types of duty cycle service are dragline, clamshell, grapple, and magnet. This type of service is differentiated from standard crane "lift service" in that cycle times are very short and continuous. Cycle times are often less than one minute per load, and loads are lifted and placed in general areas rather than precise positions to permit such rapid cycles.
- Repetitive Lifts: A continuous operation with loads that may vary in size and weight.
The requirements for using rotation resistant rope for duty cycle and repetitive lifts vary with the type of rotation resistant rope being used and the operating design factor of the rope. If you are using rotation resistant rope for one of these purposes, check the standard for the criteria that apply to the type of rope you are using.
OSHA 1926.1414 also contains the following requirements:
- Wire rope clips used in conjunction with wedge sockets must be attached to the unloaded dead end of the rope only; except that the use of devices specifically designed for dead-ending rope in a wedge socket is permitted.
- Socketing must be done in the manner specified by the manufacturer of the wire rope or fitting.
- Prior to cutting a wire rope, seizings must be placed on each side of the point to be cut. The length and number of seizings must be in accord with the wire rope manufacturer's instructions.
Knowledge Check Choose the best answer for the question.
6-5. A type of crane service in which bulk material is transferred from one point to another by rapidly lifting, swinging, booming, and placing the material is called _____.
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