×
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

ASME T limits: inch vs mm

ASME T limits: inch vs mm

ASME T limits: inch vs mm

(OP)
I have a colegues talk about which is the exact T limits in mm from inches.
The 5 mm Tlimits for WPS range is convert from 3/16", but as it is comment on nonmandatory appendix G, the value should be 4,75 mm. This value is in the same that API data.

In case of pipes thickness of 4,8 mm if my PQR was qualified with 11 mm, i am able to weld it if the WPS range is from "5" to 22 mm or not.

Thanks  

RE: ASME T limits: inch vs mm

4.8mm equals 5mm [no decimal places, rounded off per good engineering practices].  "Book Smart, Field Ignorant" folks will try to specify welds or evaluate WPS's in tenth's of mm's and thousandth's of inches.

ASME Section IX is written in 1/16's of an inch and integer mm's only.  Interpolation to closer tolerances is rediculous and well beyond the intent of ASME.  You can always tell the 'genius' that you will happily go beyond the contract-specified Sect IX variables, only "Please sign this Additional Work & Cost form"

RE: ASME T limits: inch vs mm

Good work Duwe6.
Cheers,
gr2vessels

RE: ASME T limits: inch vs mm

(OP)
Your explanation have been extremely honest.

Copy, Paste and send to my collegue....answer: Everyone agre with you but said to fu*** inspector on behalf of client.:)

RE: ASME T limits: inch vs mm

Duwe6,
Sorry to disagree but the ASME IX committee have created the confusion themselves.

QW 451.1 in the 2001 Edition shows
1/16" = 1.6 mm
3/16" = 4.8 mm
8" = 203 mm

QW 451.1 in the 2004 Edition
1/16" = 1.5 mm
3/16" = 5 mm
8" = 200 mm

If I remember correctly earlier editions (pre 2001) had 3/8" listed as 9.6 mm - now it is shown as 10 mm.

If they have rounded off 1.6 to 1.5 and 4.8 to 5 (nearest .5 mm)why has 9.6 been rounded off to 10 mm and not 9.5 mm ?
Regards,
Kiwi

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