Recent content by Freelander

It must be frustrating for you to field questions from stupid people like me. My apologies.

Like this, no?

That's not hypothetical. The load would be centred. I mean an evenly thick load is heaviest in the middle no?

How can I explain. It might be a length of 56 inch wide conveyor belt hanging vertically. A flat one inch wide thing would still be heavier in the middle, hypothetically would it not? In any case a centre point load is the least desirable of the possible situations. Then the question would be...

If such a lift were to happen it might already have been refused because of clearance and wind factors possibly today.

Then I can calculate a design/safety factor. Which I expect to be below 1.

'Safe' is stupid. Minimum breaking strength is what I want to know.

Okay. The weld is the whole way around. It is a butt weld. There's at least 5 passes. It's built up a 1/4 inch. Hard corner on the 4 inch tube was chamfered. Test lift was already done. Load safety device on the crane read 35,000. So the actual load on the beam is less: 2,000 lb block, weight...

Sorry is that even remotely a useful diagram? Also: it is well understood that I am not getting professional advice. I simply lack the google fu or knowledge to even ballpark the safe UDL of such stuff. I do not understand nor can calculate modulus of elasticity stuff or whatever.

I will send a napkin CAD within the hour.

A500 has a lower UDL before deformation? I want to know the best and worst case scenarios, best steel and thickest wall and worst steel and thinnest wall or please all 4 combos. I am a stupid labourer being asked to do a sketchy lift and want to know some real material engineering numbers. I...

Have a lifting yoke with 7/8 inch lifting eyes welded onto the ends of a 3/16 or 1/4 inch wall 4x4 a500 or a513 square steel tube. Expected UDL is as much as 35-40,000 lbs. Is this tube going to fail?