Codes for lifting eyes 4

[iainuts]

Is there an ASME code (or other US code) which covers requirements for lifting eyes? In particular, I need to put a couple of lifting eyes on a machine and would like to see what specific requirements there are for determining suitable lifting eyes.

 

[SnTMan]

iainuts, recommend ASME BTH-1 / B30.20, available from the same.

Regards,

Mike

 

[MiketheEngineer]

Both Grainger and McMaster-Carr have "rated" lifting eyes.. I would assume (maybe mistakenly) that these are ASME "rated???

 

[iainuts]

Thanks Mike & MiketheEngineer. B30.20 doesn't mention lifting eyes though. Is there another standard that does? Here are some more specific questions.

1) McMaster Carr has unrated lifting eyes - are these acceptable?

2) Thread is 1/4"-20 UNC. Does this need to be bigger to meet code? (side note: load is ~ 600 pounds total using 2 lifting eyes)

3) If lift is not verticle, how should shoulder type lifting eyes be derated?

4) Is there any derating for a shoulder type lifting eye if washers are added?

5) Is there a minimum acceptable length of thread required? Seems like all the lifting eyes I've seen have threaded sections that are much longer than necessary.

I'd like to see a standard that covers these kinds of things if there is one.

Thanks for the feedback.

 

[boo1]

In the US the following may help guide you:
ASME BTH-1-2008 Design of Below the Hook Lifting Devices, Chapter 3
ASME B30.20a-2003 Structual and Mechanical Lifting devices. Section 20-1.2.2 Construction
CMAA crane requirements
AASHO 1.6.17
Steel Construction Manual-AISC
Occupational Safety and Health Administration (OSHA) 29 CFR standard 1926.753(e)(2) and 1926.251
American Society of Testing and Materials Specifications A391
Naval Facility Command NAVFAC-307
American National Standards Institute, "Below The Hook Lifting Devices"

 

[unclesyd]

Carr Lane has several types, some are to OSHA, as posted above or Mil Spec., some are not. All have a five to one safety factor. Never use the safety factor during normal lifting.

http://www.carrlane.com/Catalog/ind...10D020609090C0015480013180B041D1E173C1B085351

 

[iainuts]

Thanks boo1, I'll have to check some of those out. Do any of the specs address the questions per my second post above?

Thanks unclesyd. The Carr Lane rings look good and they have 1/4"-20 threaded hoist rings too.

 

[Bribyk]

Also check out Crosby for reputable lifting gear.

When you buy the eyes, the manufacturer's rating and instructions become the code (as they're usually based on one of the above-mentioned codes). Follow the instructions of a reputable manufacturer and you shouldn't have any issues.

 

[MJCronin]

Mike...

You state:

"Both Grainger and McMaster-Carr have "rated" lifting eyes.. I would assume (maybe mistakenly) that these are ASME "rated???"

Ummm ----no

My understanding of "rated" is that you test your design to destruction, take an average of many tests, then divide that number by 5 to get your "rated" load.

ASME "rates" nothing...

-MJC