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ASME interpretation IX-80-67 and QW-202.4 requirement

ASME interpretation IX-80-67 and QW-202.4 requirement

Postby mohd » Sat Dec 14, 2013 1:13 pm

Dear team,

Available PQR: P1 material to P1 material in full penetration welding where both are pipes with thickness 20 mm.

For the below branch joint can I qualify for WPS with thickness of the vessel's shell up to 65 mm as per the below interpretation IX-80-67 or as per QW-202.4(b)?
Fig-1.jpg
Fig-1.jpg (8.9 KiB) Viewed 2531 times

The following interpretation of ASME Section IX applies to Set-through and Set-on nozzle installation:

Interpretation: IX-80-67
Subject: Nozzle to Shell Connections
Date Issued: December 8, 1980
File: BC-80-675

Question: When nozzle or branch connections are attached to the wall or head of a pressure vessel, what are the basic criteria establishing procedure and performance qualification requirements, assuming impact test is not a requirement?

Reply:
Where the nozzle is attached to the vessel by welding completely through the thickness of the vessel wall, the procedure shall be qualified for the thickness of the vessel wall penetrated by the nozzle or attachment. Where additional metal is placed on either the interior or exterior of the vessel wall in the form of fillet welds, they shall be considered as having been qualified by the procedure qualification covering the thickness of the vessel wall. Performance qualification for this weldment may be made in plate to cover the appropriate thickness of the vessel wall and the position in which the weld is being made. Diameter is not a factor.

Where the nozzle or attachment is welded to the vessel wall by welding through the thickness of the nozzle or attachment, the procedure qualification shall be made for the thickness of the nozzle or attachment wall at the time of welding. Performance qualification for this condition shall be made with the appropriate diameter pipe as required by QW-452.3, with the range of thickness of weld metal qualified determined by the thickness of the nozzle or attachment wall at the time of welding. Any fillet welds, both procedure and performance, will have been qualified when qualifying for the full penetration welds involved.

Note: The above interpretation refers to nozzle attachment to vessels, however the criteria apply to branch attachments to pressure piping as well.
Attachments
Branch connection ASME.pdf
(92.69 KiB) Downloaded 398 times
mohd
 
Posts: 74
Joined: Mon Jul 08, 2013 2:17 pm

Re: ASME interpretation IX-80-67 and QW-202.4 requirement

Postby techupon » Mon Dec 16, 2013 12:57 pm

Mohd,

Please note that the ASME interpretation IX-80-67 has been acknowledged by ASME organization as "error" and thus an "errata" has been issued regarding that interpretation (please have a look to the attached "absa newsletter" file that is a part of a subsequent issue than the one attached by you from the news letter of ABSA organization). Moreover please note that the interpretation IX-98-20R (please see attached) helps us to better clarify such an issue. So, you shall follow the QW-202.4 which in that case requires the thickness of both parts (nozzle and shell) to be within the range permitted by QW-451 and thus the qualified thickness range is 5 mm up to 40 mm for both of parts.

regards,
techupon
Attachments
absa newsletter.pdf
(82.47 KiB) Downloaded 332 times
Interpretation IX-98-20R.pdf
(39.29 KiB) Downloaded 409 times
techupon
 
Posts: 18
Joined: Thu Nov 28, 2013 9:50 am

Re: ASME interpretation IX-80-67 and QW-202.4 requirement

Postby mohd » Mon Dec 16, 2013 4:16 pm

dear techupon,

Thanks, now it is clear to me.

regards,
mohd
mohd
 
Posts: 74
Joined: Mon Jul 08, 2013 2:17 pm


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