[Monzsta]

Just a note on lifts, ANSI specs state any load bearing structure intended for personnel to be on/underneath must have a rating of X3. This means a 10,000lb lift must withstand a 30,000 load before failing and the failure must be of a deformation and not a shearing/snap failure. They really do have your safety in mind when they build these things.

Originally Posted by ANSI

ANSI/ALI ALCTV-1998 became fully effective on April 1, 2000. ANSI/ALI B153.1-1990 has been withdrawn. Both are performance standards requiring, in part, that catastrophic failure of the lift should not occur at less than three (3) times the lift's "rated load capacity". The most common lifts are "rated" at 7,000 and 9,000 pounds which means they should support 21,000 and 27,000 pounds respectively without collapsing. Skipping over the technical alternates, such as stress calculations, finite element analyses (FEA), etc., the usual and most practical way to run this test on these more common types of lifts is to raise the unloaded lift, load it with steel to the test weight, and see if it collapses.