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Course 821 - Crane and Derrick Safety II

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Multiple Crane/Derrick Operations

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Multiple Crane/Derrick Lifts

Lifts in which more than one crane or derrick is used require careful planning and precise coordination. It is particularly important to determine how the weight of the load will be distributed among the multiple pieces of equipment during all phases of the operation to ensure that all are operated within their rated capacities. Accordingly, when more than one crane/derrick is used to support the load, a plan must be developed and implemented. The plan must be developed by a qualified person and be designed to ensure that all requirements of this standard are met. Where the qualified person determines that engineering expertise is needed for the planning, the employer must ensure that it is provided.

The multiple-crane/derrick lift must be directed by a lift director who meets the criteria for both a competent person and a qualified person, or by a competent person who is assisted by one or more qualified persons. The lift director must review the plan in a meeting with all workers who will be involved with the operation.

Design, Construction and Testing

obligations
The crane user's obligations are met where the employer can refer to documentation from the manufacturer showing the equipment has been designed, constructed and tested in accord with this section and the equipment has not changed since it was manufactured.

For equipment to be used safely, it must be built with appropriate safety features and maintained in a safe condition. Although manufacturers are not directly subject to this standard, crane users rely on manufacturers to see that the equipment is built and tested so that it is safe when it leaves the manufacturer. The crane user, which is typically the employer, has an obligation to verify the equipment has been designed, constructed, and tested to meet the job requirements. This can typically be done by referring to the manufacturer’s documentation. It’s also important for the employer to verify the crane hasn’t been modified since it was manufactured.

You cannot rely on manufacturer documentation to comply with the requirements below:

Rated Capacity and Related Information Requirements

The following information must be available in the cab:

  • a complete range of the manufacturer's equipment rated capacities
  • a work area chart for which capacities are listed in the load chart (the work area figure and load chart must clearly indicate the areas where no load is to be handled)
  • recommended reeving for the hoist lines
  • recommended parts of hoist reeving, size, and type of wire rope for various equipment loads
  • recommended boom hoist reeving diagram, where applicable
  • size, type and length of wire rope
  • tire pressure (where applicable)
  • safety
    You must ensure the necessary safety information can be found inside the cab of the crane.
  • caution or warnings relative to limitations on equipment and operating procedures, including an indication of the least stable direction
  • position of the gantry and requirements for intermediate boom suspension (where applicable)
  • instructions for boom erection and conditions under which the boom, or boom and jib combinations, may be raised or lowered
  • whether the hoist holding mechanism is automatically or manually controlled, whether free fall is available, or any combination of these
  • the maximum telescopic travel length of each boom telescopic section
  • whether sections are telescoped manually or with power
  • the sequence and procedure for extending and retracting the telescopic boom section
  • maximum loads permitted during the boom extending operation, and any limiting conditions or cautions
  • hydraulic relief valve settings specified by the manufacturer

Miscellaneous Requirements

fire extinguisher
There must be an accessible fire extinguisher on the equipment.
  • Load hooks (including latched and unlatched types), ball assemblies, and load blocks must be of sufficient weight to overhaul the line from the highest hook position for boom or boom and jib lengths and the number of parts of the line in use.
  • Hook and ball assemblies, and load blocks, must be marked with their rated capacity and weight.
  • Hooks must be equipped with latches, except where a qualified person has determined that it is safer to hoist and place the load without latches (or with the latches removed/tied-back), and routes for the loads are pre-planned to ensure that no employee is required to work in the fall zone except for employees necessary for the hooking or unhooking of the load.
  • Posted warnings required by this standard, as well as those originally supplied with the equipment by the manufacturer, must be maintained in legible condition.
  • An accessible fire extinguisher must be on the equipment.

Equipment Modifications

This section applies to modifications that affect the capacity or safe operation of the equipment. Its provisions safeguard against unsafe equipment modifications and provide that the modifications are reflected in the equipment's instructions and specifications so that the modified equipment can be used safely.

Equipment Modifications

equipment
The equipment's manufacturer is uniquely qualified to evaluate any proposed modifications to the equipment.

Section 1434 applies to modifications that affect the capacity or safe operation of the equipment. Its provisions safeguard against unsafe equipment modifications and provide that the modifications are reflected in the equipment's instructions and specifications so that the modified equipment can be used safely.

Manufacturer Review and Approval

The equipment's manufacturer is uniquely qualified to evaluate any proposed modifications to the equipment. If the manufacturer is available and is willing to evaluate the proposed modifications, any modifications or additions that affect the capacity or safe operation of the equipment are only permitted where:

  • The manufacturer approves the modifications/additions in writing.
  • The load charts, procedures, instruction manuals, and instruction plates/tags/decals are modified as necessary to accord with the modification/addition.

Manufacturer Review Unavailable

If the manufacturer is:

  • unavailable or unwilling to review the proposed modification/addition,
  • rejects it in writing,
  • fails to initiate the review or acknowledge the request within 30 days, or
  • fails to complete the review within 120 days, the modification/addition may be made if a registered professional engineer who is a qualified person with respect to the equipment involved:
    • approves the modification/addition and specifies the equipment configurations to which that approval applies; and
    • modifies load charts, procedures, instruction manuals, and instruction plates/tags/decals as necessary to accord with the modification/addition.

Videos

Instructions

Before beginning this quiz, we highly recommend you review the module material. This quiz is designed to allow you to self-check your comprehension of the module content, but only focuses on key concepts and ideas.

Read each question carefully. Select the best answer, even if more than one answer seems possible. When done, click on the "Get Quiz Answers" button. If you do not answer all the questions, you will receive an error message.

Good luck!

1. When more than one crane/derrick is used to support the load, a plan must be developed by a _____.

2. A multiple-crane/derrick lift must be directed by a lift director who meets the criteria for _____.

3. With a couple exceptions, multiple-crane/derrick lift load hooks must be equipped with _____.

4. If the manufacturer is unavailable or will not review a modification to crane equipment, the modification may be made if a _____ who is a qualified person with respect to the equipment is involved.

5. Posted warnings required by this standard as well as those originally supplied with the equipment by the manufacturer must be maintained in _____.


Have a great day!

Important! You will receive an "error" message unless all questions are answered.