My dear,IP is in the root, right? In 8" pipe VT is obviously out ruled. My question is, IP being a serious discontinuity, how is it acceptable even for normal fluid service? IQI contrast - indication density, etc is bit untidy, but the main question is not that. Thanks, SV --- On Tue, 21/2/12, vijayan <vijayan.m@madinagulf.com> wrote:
From: vijayan <vijayan.m@madinagulf.com>
Subject: RE: [MW:13767] Incomplete pen vide B31.3 2004 Ed
To: materials-welding@googlegroups.com
Date: Tuesday, 21 February, 2012, 7:00 PM
Hi Ref B31.3 The applicable NDT method for this defect is VT and RT. If it is an open joint check the depth of IP by visual. But in RT you can approximately identify( Not measure) the depth by difference in contrast relative to the IQI contrast at that location BR M.Vijayan From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Shashank Vagal
Sent: Tuesday, February 21, 2012 2:12 PM
To: materials-welding@googlegroups.com
Subject: Re: [MW:13764] Incomplete pen vide B31.3 2004 Ed | Thanks, Manpreet and others,
It was captured during RTFI and the lengths were 12 mm and 25 mm at 2 different locations. I have already given both as repair. But the contractor came with this table which shows Category M fluid, girth weld, weld imperfection ' Incomplete Pen' is referred to as B. On the following page, B refers to "depth" of IP to between ≤1mm and ≤ 0.2Tw (whichever is lower is implied) and not length. Now, that is one tough task to determine depth of an IP, by RT at least. In Cum Length, < 38 mm in 150 mm, we have acceptance.
So, is my judgement correct or no?
Best regards,
Shashank Vagal
--- On Tue, 21/2/12, manpreet <manpreetsin88@rediffmail.com> wrote:
From: manpreet <manpreetsin88@rediffmail.com>
Subject: Re: [MW:13762] Incomplete pen vide B31.3 2004 Ed
To: materials-welding@googlegroups.com
Date: Tuesday, 21 February, 2012, 1:49 PM
Hi,
As per ASME B31.3, acceptance criteria for incomplete penetration is:- between ≤1mm ann ≤0.2Tw
was it caught by Radiography or ultrasonic testing?
If UT then there is possibility that what you are referring to "incomplete penetration" might
actually be "Lack of sidewall fusion" for which table 341.3.2 Note 7 states that
"tightly butted unfused root faces are unacceptable".
Regards
Manpreet Singh
On Tue, 21 Feb 2012 09:11:51 +0530 wrote
>Gents,
REF:
B31.3 Ed 2010, Table 341.3.2
Weld joint of 8" dia x 7 mm thick 106 Gr B, Fluid Service Normal, Category M.
Welding Process: GTAW + SMAW.
Is incomplete pen allowed as per this code to any extent ? Please advise.
Regards,
Shashank Vagal
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