×
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

Terminology on mechanical drawing
2

Terminology on mechanical drawing

Terminology on mechanical drawing

(OP)
This is probably a simple question but Google and my colleagues haven't been much help so far:

A fairly large vessel, almost certainly clad with thermal insulation, has two dimensions shown for its diameter: one is a plain 13.8m, the other is slightly larger "15.9m T/T". What does the T/T suffix signify? The two dimensions clearly aren't I.D. and O.D. so I'm wondering if it is diameter over the thermal insulation, or the dimension or between ports? Or something else entirely? Would appreciate if someone could help me out!
  

----------------------------------
  
If we learn from our mistakes I'm getting a great education!
 

RE: Terminology on mechanical drawing

This "t/t" is no way appears to be meaningful communication.  If non-standard terms are used on drawings, they either need to be defined in the notes or in the company standard which can be made available to anyone reading the drawing.  In this case, instead of using "t/t", I would've use a delta note and explained what I meant in the general notes with full verbage.  

Sorry I couldn't help on this though.  Do you have an example of this you can post so maybe we can through some guesses at you?

Matt Lorono
CAD Engineer/ECN Analyst
Silicon Valley, CA
Lorono's SolidWorks Resources
Co-moderator of Solidworks Yahoo! Group
and Mechnical.Engineering Yahoo! Group

RE: Terminology on mechanical drawing

2
Standard vessel terminology:
t/t = "Tangent-to-Tangent".
This is the length of the straight side from one tangent line to the other tangent line.
 

RE: Terminology on mechanical drawing

(OP)
Guyss,

Thank you all very much.

  

----------------------------------
  
If we learn from our mistakes I'm getting a great education!
 

RE: Terminology on mechanical drawing

I concur that Pennpiper gave you the right answer.

 It means "tangent to tangent" or the straight length of the vessel including the straight flange portions of the curved vessel heads.

 
  
 

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