Proper Design Code 2

[Creech]

Can someone direct me to the proper design standard for the following machine.

It is a fork lift type machine that is on a railroad type track that lifts a ring (125"OD X 55" height 7500lb weight). the lift has 2 "forks" on bottom and 2 on top. The machine moves to the ring, the two forks on the bottom go up, the two on top go down (squeazes ring). then proceeds to lift it up, rotates it 180 deg, then back down. I don't know the proper codes for manufacturing and or altering such a devise. Is it a crane, a fork lift ect.? Any help would be greatly appreciated. Also the machine and load would be in a gate and impossible to have anyone under it.

Rich

 

[boo1]

I would condiser it a below the hook devise.
In the US the following may help guide you:
Occupational Safety and Health Administration (OSHA) 29 CFR standard 1926.753(e)(2) and 1926.251
ASME B30.20a-2001 Structual and Mechanical Lifting devices. Section 20-1.2.2 Construction
CMAA crane requirements
AASHO 1.6.17
Steel Construction Manual-AISC
American Society of Testing and Materials Specifications A391
Naval Facility Command NAVFAC-307
American National Standards Institute, "Below The Hook Lifting Devices

Cheers

 

[ccw]

Hi Creech,
If it can be established and agreed to by the owner/operator that catastrophic failure of this machine will not lead to unacceptable programmatic delay or cost or threat to life and limb, then it could be argued that none of the above standards would apply. However, I doubt this is going to be the case for the machine you describe. So, the ANSI/ASME B30.20 series; which essentially says design for normal max load rating so general, computed max. static stresses are less than 1/3 published minimum material yield, and/or 1/5 minimum UTS; and do proof testing at 125% max rated load is probably a suitable standard. Non-ductile high stress points, such as the rail cart axle bearings or rotator axle bearings, may require considerations of other load factor critera.