"This is an Archived Ergoweb Forum page -- Submissions are no longer possible"

Home Forums General Ergonomics Topics NIOSH Lifting equation multi-task

This topic contains 3 replies, has 2 voices, and was last updated by  [private user] 14 years, 9 months ago.

Viewing 4 posts - 1 through 4 (of 4 total)
  • Author
    Posts
  • #36803

    ErgoMaine
    Participant

    I have a question on the NIOSH Lifting Equation. My boss wants me to make a recommended weight limit for a task of unloading a 4-tiered pallet. When I perform the multi-task, I get a CLI of 3.67. He suggests that I can just take the known load of 20 pounds and divide by the CLI to get a recommended CRWL of 5.45 pounds. I read through the Revised NIOSH Lifting Equation book, and I don’t see any equations to do a “composite recommended weight limit” CRWL.

    I tried taking the least RWL for an individual task, and re-running the whole multi-task calculation. The CLI dropped to 2.4.

    Any thoughts on this?

    #42519

    [private user]
    Participant

    Can I suggest that the boss be asked, does he/she want to know the result of the equation (the final number?) or does he want the overt physical, musculoskeletal strain significantly reduced or eliminated? My guess is that his/her objective is to reduce or eliminate the need to lift whatever is being lifted which is the essence of the human factor/ergonomics intervention…..I’ve done this several times in the past with EHS Managers quite successfully….just get rid of the problem and forget about the result of the calculation (it’s ancillary)……move-on with the next workplace challenge, put the old one “to bed”.

    Carolyn Lundberg

    ACE Ergonomics

    #42520

    ErgoMaine
    Participant

    Thanks for your reply. You are correct in that we want to reduce/eliminate the musculoskeletal stress associated with this task. We want to use the appropriate ergo analysis tools to help us make the case. So getting the numbers right is important. If we get the numbers right, then hopefully we can measure the effectiveness of any suggested solutions.

    Part of this problem is how we communicate to our clients. Giving them a LI or CLI is good, but it many do not understand what it means. Recommended weight limits may be easier to understand for non-ergonomists.

    #42521

    [private user]
    Participant

    You are correct, many non-ergonomists do not understand the equations. I wish you success in your endeavor. It is obvious from your message that you have your priorities in order. BTW, most practitioners struggle with the NIOSH equation; you may want to contact one of the university Human Factors profs. to support your cause.

    Carolyn

Viewing 4 posts - 1 through 4 (of 4 total)

The forum ‘General Ergonomics Topics’ is closed to new topics and replies.

pingdom-test-string