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
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
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
Cheers,
gr2vessels
RE: ASME T limits: inch vs mm
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
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