×
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

1949 Code Allowables

1949 Code Allowables

1949 Code Allowables

(OP)
Is anyone aware of the reasons why the 1949 ASME Code dropped the stress allowables?

1943 and 1952 had an allowable stress of 13,750 for SA-285 C for example but in 1949 the allowable was dropped to 11,000.

RE: 1949 Code Allowables

Just to guess, someone died.

RE: 1949 Code Allowables

When you multiply 11,000 x 1.25, you get 13,750. There is probably a paragraph in that code that allows you to use the multiplier depending on your requirements. So in the end you still get to use the same alowable stress.

RE: 1949 Code Allowables

(OP)
There was not a paragraph that allows the use of 1.25 to increase the allowable for any situation regarding shell thickness.

RE: 1949 Code Allowables

Pre World War II factor against ultimate = 5

During the war factor dropped to 4 to save steel.

Post-war the factor raised back to pre-war level.

1950 edition of Section VIII is back to a factor of 4. Presumably not too many war era vessels were experiencing problems and the committee decided that the factor of 4 was sufficient. Until the late 1990's...

jt

RE: 1949 Code Allowables

(OP)
Thank You jte!

RE: 1949 Code Allowables

jst: Nice response.  It is always cool to get the back story on the how and why of the codes we work with.  

There are days when I wake up feeling like the dumbest man on the planet, then there are days when I confirm it.  

RE: 1949 Code Allowables

Thanks, Jte.

Just want to add that the current safety factor is 3.5 but not every state of the US nor every other country is accepting it.

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!


Resources