manual chain hoist load rating 2

[bhart192]

we need to rate some small manual chain hoist ,these are used to lift material and various small parts, what is the FS required by OSHA.

 

[JStructsteel]

If I recall, OSHA publishes this on the website. In general, I recall for rigging it was 4 or 5 FS on wire rope, hooks, blocks, etc.

 

[Bribyk]

I take it you're in the States somewhere. In Alberta, Canada, there isn't a required safety factor or standard for lifting devices with a capacity of less than 2000 kg- it simply must be certified by a professional engineer. Check your OSHA Legislation though.

For reference, rigging safety factors (rope, slings, shackles, etc...) are 4-5, below the hook devices (spreader beams, etc...) SFs are a minimum of 3 (see ASME B30.20 & BTH-1) while cranes can be as low as 1.5-2.5. I would aim towards 3-4 as chain hoists are typically neglected as far as maintenance and inspection.

 

[GregLocock]

If people can stand underneath the load, or it is man rated, then higher SFs apply, where I work we design to 4 and test to 2 annually, for general workshop hoists and jibs.

Cheers

Greg Locock

SIGlease see FAQ731-376 for tips on how to make the best use of Eng-Tips.

 

[MiketheEngineer]

Check w/ the mfg. Ropes, slings, etc are 5:1

 

[Bribyk]

Every piece of rigging/literature from a manufacturer states that persons should not be under the load. Nobody wants this liability...

I doubt you're lifting people with a manual chain hoist but the required safety factor here for manlifts is 10:1.