×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Davit Arm Calculations
2

Davit Arm Calculations

Davit Arm Calculations

(OP)
Hi, I'm working through calculations for a davit arm design, from Pressure Vessel Design Manual 3rd Edition by Dennis R. Moss, to check against my calculations. The web link as follows is best for descibing it: https://www.excelcalcs.com/calcs/search-calcs/Stre...
Questions:
1. Has anyone gotten effective results from it?
2. Section 3.1 Bending Moment, what is the 'l' (lower case L) in M = lV, contributed from: Pressure Vessel Handbook 12th Edition by Eugene F. Megyesy?
3. Does any one have better analytical analogy for Type 1 davit arm design?
Thanks heaps.
Referencing Eng-Tips closed post: thread794-332471: Design or calculations for davits

RE: Davit Arm Calculations

Avoid calculations, try to use standard davit as per PIP VESSEL STANDARD DETAILS.

Regards

RE: Davit Arm Calculations

Have UG-22 Loadings been considered? What about the attachment welds? Any fillet welds been evaluated in the shear?

RE: Davit Arm Calculations

@ oknow
Have you the PIP VESSEL STANDARDS DETAIL?

Regards

RE: Davit Arm Calculations

(OP)
You guys are gun! Thank you for your responses. I haven't had to engineer pressure vessels before and I am not familiar with the codes you're referring to, and I don't have the PIP Vessel Standards Detail. My main concern is the height of the davit that I can go to with the lightest SHS steel...hence the calcs. Welds aren't a problem. If you can please direct me closer (Section, page number, web site) to what you're both referring to in the documents you mention, that would be so awesome as I have not found anything useful yet (I'll keep working at it).

RE: Davit Arm Calculations

r6156..I do not have that PIP Vessel Standard but from what I viewed on a search seems to be Procedural type of document to which I am not sure who would use or how it is incorprated into ones Quality System. Just how it would support the design of the davit for ASME UG-22 Requirements. The 2019 revision to UG-44(b) requirements may also impact the davit attachments

RE: Davit Arm Calculations

Re-Eng Rana, please clarify: Davit is attached to a pressure vessel, or no? "Sand bagging"?

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

RE: Davit Arm Calculations

(OP)
Hi Mike, SnTMan,
The davit isn't attached to a pressure vessel. In this case it is similar to sand bagging..it's a 1 tonne lifting frame...6m tall.

oknow and r6156, I cannot find anything useful in the documents you have suggested, sorry. But Maybe i don't have access to it all.

Thanks heaps!!

RE: Davit Arm Calculations

(OP)
An update for all these champions for helping me, and for future designers, the formulas I was following, noted in my first post, are correct. The one thing I did not have correct was the strength of the steel SHS member mast. It required to be 350MPa as a minimum, not the 250MPa that I was using.
I really appreciate having others out there who gave me support. Thank you.

RE: Davit Arm Calculations

All thickness in PIP Davit are based on 36 ksi Yield Strength.

Also see Pressure Vessel Design Manual by Dennis R. Moss, 4TH Ed.

Regards

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Resources

White Paper - A Guide to 3D Printing Materials
When it comes to using an FDM 3D printer effectively and efficiently, choosing the right material at the right time is essential. This 3D Printing Materials Guide will help give you and your team a basic understanding of some FDM 3D printing polymers and composites, their strengths and weaknesses, and when to use them. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close