Recent content by Gixer1127

Folks, thank you for your replies. Very much the road I was travelling. The dynamic amplification of a lift like this using a crane that does not have motion compensation would be very difficult and potentially dangerous. I will use the points you have brought up to question the team that are...

Quayside for the mobile crane and I'll expect the crane to keep tension on the load as it moves to vertical to prevent any shock loading.

Hi Berkeman. No issues with liability as this will be down to me as final signatory on the plan. Basically, the lifting foreman will draft the plan and I'll review, recommend any changes if needed , and sign off. I'm in Senegal so slightly different rules apply. That all being said, I just need...

Hey folks. A quick question. Not homework, very much work related. I've been asked to plan a lifting operation to lift a 30 metre long by 35te (metric tonne) spud leg from horizontal to vertical. The spud leg is essentially a cylinder approximately 2 meters in diameter. It is held at one end on...

No idea what causes the pressure to drop, this is all the info I was given in the question. However, I have done what you have suggested with checking the 320bar and original temp and got a final mass of 155291g. In my original post I had missed a 4 (155294). So the only things that have changed...

Hey folks, any help will be greatly appreciated. I have, what I thought, was a fairly simple equation to follow to determine the mass of air in a pressurised air tank. See below question and my attempt at solving using the pV = (m/Mr)RT) equation. A pressurised air tank supplies compressed air...

Hi Tom. I thought I'd posted a reply a couple of days ago but obviously didn't push the send button. 🙄 You are 100% correct, of course. I used the wrong unit of measurement so thank you for spotting this. I have changed this and submitted for marking.

Sorry, yes, I missed out in my original post where the 20mm comes into play. The 16 mm diameter steel bolt with modulus of elasticity of 160 GPa and modulus of rigidity of 90 GPa shown in the diagram below holds two components together. The thickness of the bolted interface of the components is...

Nope, going with 20mm, not 0.02m.

(b) Tensile strain (ɛ) = σ/E Modulus of elasticity (E) of the bolt is 160GPa. ɛ = 34468656.72Pa / 160x10⁹GPa = 0.0002154 (2.154x10¯⁴) (No units of measurement for strain) (c) Extension = ɛ x original length Extension = 0.0002154 x 20mm = 0.004308mm(4.308x10¯³) I'm thinking the above in bold...

It's OK, I've seen the error of my ways

Hey folks. I've just had this come back as wrong from my tutor. He's saying the decimal point in (a) is in the wrong place. This in turn leads onto an incorrect answer for (b) and (c) Any pointers on where I've gone wrong?

Thanks Tom. Yup, that's what I'm trying to get my head around. I'll get there in the end and have almost completed this particular assessment with the help of the folks on here. Very much obliged to all.

Many thanks. I've a few more "interesting" questions to get through on this assessment so you might see another post in the very near future. Thanks again for prompting me in the right direction.

OK, so is my answer of 14806.9N correct for the tractive force? I've been over all the posts and this is the only answer (so far) that I can come up with. If this is correct then I'll submit the wording only on how I accomplished this with a nod to Newtons 2nd Law of Motion. I do want to know...