Trunnion Lifting calcs 7

s111,

I suggest you read the pressure vessel handbook from Moss. In it, it detailed a time tested method to analysis erection loads during every angle of lift. After you determine the maximum load for the tail lug and trunnion, size these members then check the local stresses on the shell and on the skirt. On the skirt, you have to check for local skirt buckling around the skirt and anchor chair ring composite section. Just read the book, I need to write a paper to explain to you what has to be done; way too much effort.

Also, you should not size the lifting lugs and tail lug without FULLY UNDERSTANDING how to do it. If you need a trunion for lifting, then this tells me you are not dealing with a light weight "pots and pans". You should have a senior engineer to supervise and teach you how to do all this. If you screw up, someone can get kill and the equipment will be damaged.

S111,

I forgot to mention, you can do what most people do now a days is to buy "Compress" software to design the vessel. It also analysis the erection loads and check local stresses. I don't recall it designs the lugs. Good luck.

thanks vesselguy, yes indeed we do have Compress for vessel design, but it does not provide for lifting analysis and trunnion design. So I need to do hand calcs.

Or you could wait a few months... thread1259-184855

But it's really better to go through some hand calc's first anyway keeping in mind the good advice that vesselguy gave you in his posts above...

jt

s1111,

I agree with Tom, this is not a matter for beginners..

People can and have been killed when lifting devices and weldments have been improperly designed.

Is there anyone there at your organization that can lead or instruct you ?

s111,

That's a surprise to me.. the last time I used compressed 2 years ago it had a lift analysis. Anyhow, I just checked my 3rd edition of Moss's book, he has put in an extensive section on vessel lift analysis and design of lifting lugs. Go and get this book and your problem is solved. some of his erection calculations in there are from the Fluor manuals; the methods have been proven for more than 30+ years. I should know, I used to worked there many moons ago.

Seriously, even if you get the book and followed it right, you still need a review by another experienced engineer. Heavy lift is not to be kidding around with.

Thank you vesselguy and MJCronin.
valuable advice. I do have my chief who has several years of experience checking my work.

Thank you so much again. I apologize for the delay in replying back.

s1111 (Mechanical)

Technical Note:

** I Agree with vesselguy (Petroleum)Review Dennis Moss 3rd Edition Prossure Vessel Design Manual.
Brown Book Shop, Houston, Texas.


1). Review FE-Pipe / Nozzle Pro manual for Trunnion Lifting calcs:
2). Codeware Compress build 6253 has included Trunnion Lifting calcs:
Stephen
L S Thill

Thank you THill.

S

FYI and FWIW:

The television show "Extreme Engineering" on the Discovery Channel has an interesting episode about the LNG plant at Sakhalin Island, Russia. There's a 4-5 minute long segment where they show a good-sized vessel being trucked in, then lifted and turned with lifting trunnions, and then set into place on the foundation and anchor bolts. It shows great close-ups of the trunnions, spreader bar, tailing lug, stiffener beam at skirt base ring, and anchor bolt chairs.

Here's a link to a preview of the episode. About 25 seconds into the preview is the vessel lifted with trunnions

TomBarsh, I'll view this later, but a star in advance.

Regards,

Mike

s1111 (Mechanical)

Plant Engineering Solution 21 English: web base calculation for Plant Engineering Solution.

Tower Ligting Solution.