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@littleInch, thanks, will let you know how it goes. We usually only test to 2x but usually do calcs to 5x, go figure... @dgallup, you're actually not wrong. Might be worth considering. I'll have a ponder over the weekend and come back to it. Cheers.

Thanks, will take a look. I've actually done quite a lot of work on lifting lugs and created a pretty comprehensive spreadsheet for that using ASME BTH-1 calcs. This thing is a bit of a different animal though, haha.

Yes, that was my concern and it could easily see a knock as it's industrial equipment. Not carbon steel no, 316 stainless.

Min. factor of safety of 4.65 which is at the connection between the pads and the box section. This could be an artefact, but regardless, this isn’t bad at all!

Thanks again everyone for your input on this. It might be worth mentioning materials at this point. This is stainless steel (316) 60 mm x 5 mm SHS & 1 1/2" SCH 80 pipe. It's a beefier version of its predecessor which was only made from 1" SCH 40 pipe, however, the span has grown to 1200 mm and...

Thanks again, everyone. dgallup, only reason not to use solid bar is to save weight. This lifting bar will be bolted to something that floats. I knew it was going to come back to FEA. Looks like I'm going to need to get better at hand calc FEA. Something I've not done before. LittleInch, the...

No, I'm not trying to bend the tube, the tube will be bent already. I'm using the bent tube to lift a load using the above, welded assembly.

LittleInch. There's actually a fair bit going on with this, I was trying to simplify it and break it down into smaller calcs in the hope of getting a rough idea if my design is suitable or not. The whole thing looks like this... The SHS is basically a spreader beam which I am happy is strong...

Thanks, everyone. Lots (more) to look at. rb1957 I don't have a press local to me atm as I'm working from home :'(... But might be something I can look into once Covid has buggered off enough that I can return to work. Cheers.

Thanks. I'll look into them both. Think I've already been via Roark's formulas but I'm not sure they were what I was looking for.

See that's where I fall down. I can use Inventor for FEA but not only do I not trust it, but I'd also like to be able to figure this one out manually. I'll google non-linear FEA and see if I can find anything though. Cheers.

I'd assume this was the maximum pressure the pump could take, however 400 psi for a gear pump seems quite low to me. It does state head next to it though so it could be that the pump will operate comfortably at higher pressures but the maximum head of the inlet is 400 psi. I'd just ask the...

I have some tube (see above & ignore the fact that it's bent for now) and I'm trying to find out how I can calculate the force or load it'll take before the tube crushes. I can't seem to find this anywhere but I think I might be looking in the wrong places. I've found plenty of buckling formula...