×
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

Material designations WPxxx vs. TPxxx
4

Material designations WPxxx vs. TPxxx

Material designations WPxxx vs. TPxxx

(OP)
I get confused.
When looking in manufacturers catalogues I find pipes/tubes having both WPxxx and TPxxx designations. On the other hand, I am also finding fittings with both designations. My understanding has so far been that TPxxx refers to tubes/pipes only and that WPxxx refers to the fittings.

Can someone please clarify this for me.

PS. I am European and therefor not completely used to ASME/ASTM specs.

RE: Material designations WPxxx vs. TPxxx

LSThill,

Thanks for the dimension spreadsheet!
Very nice work.   

**********************
"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/

RE: Material designations WPxxx vs. TPxxx

(OP)
Thanks LSThill, great spreadsheet. It will undoubtedly come in handy.

Unfortunately it didn't answer my question. I think I perhaps were a bit unclear. It is the material designation that I have a problem with.
- Can a tube/pipe be of WP316L (example) or is always TP316L?
- And vice versa, can a fitting be of TP316L or is it always WP316L?

RE: Material designations WPxxx vs. TPxxx

STALguy,

I think you are crossing up two ASTM standards.

ASTM A312 is for pipe.  The grades of material are prefixed by TP.

ASTM A403 is for wrought fittings.  The grades of material are prefixed by WP (other prefixes exist, see the standard).

An A312 TP316 pipe will typically be used in conjunction with fittings from A403 WP316 (wrought), A351 CF8M (cast), and/or A182 F316 (forged).

RE: Material designations WPxxx vs. TPxxx

Since STALguy said he was looking at manufacturer's catalogs, it might be that the manufacturer is trying to be helpful and saying for pipe TPxxx, you need fittings WPyyyy.  

Patricia Lougheed

Please see FAQ731-376: Eng-Tips.com Forum Policies: Eng-Tips.com Forum Policies for tips on how to make the best use of the Eng-Tips Forums.

RE: Material designations WPxxx vs. TPxxx

(OP)
Thanks Steven,
That was exactly what I wanted to know.
Unfortunately I think that there are quite a lot of non-US manufacturers that confuses these designations. At least judging from their catalouges.
That why I asked, just to be sure. Again, thanks.

RE: Material designations WPxxx vs. TPxxx

Can't recall the orginal source, but here's what I remember.

TP = Tubular Product (pipe, tubing)
WP = Wrought Product (tee, elbow, reducer...)
F  = Forging (flange, sw fitting....)

So for a 316/316L stainless steel system:

Pipe would be ASTM A312 TP316/316L
Elbow would be ASTM A403 WP316/316L
WN flange would be ASTM A182 F316/316L

Regards,

donf

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