Dear Qadar,
Please note that pitting evaluation has been described very well in API 510, Sec.7, clause 7.4.3. You can also refer API - 579 Sec.6. But as per my experience 12.5% reduction as per ASME Sec VIII will be most approppriate.
On 1/23/10, sachin sankhe <sachin.sankhe@rediffmail.com> wrote:
Note: Forwarded message attached
-- Original Message --
From: "sachin sankhe"sachin.sankhe@rediffmail.com
To: damorin@shaw.ca
Subject: Re: Re: [MW:4127] Pitting acceptance criteria
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---------- Forwarded message ----------
From: "sachin sankhe"<sachin.sankhe@rediffmail.com>
To: <damorin@shaw.ca>
Date:
Subject: Re: Re: [MW:4127] Pitting acceptance criteria
Hi,
Similar kind on situation I experienced in one of the export Job
It was 55 mm SS plate used in construction of pressure vessel which was pitted from outside
We grinded extrnal surface to make it smooth.This was done taking client in confidance.
After this PT was done on externl grinded surface and also thk was checked so as to meet design requiremnt.Luckily manufacturer has used higher thk plate for manufactring.So problem was reolved
Regards
Sachin.Sankhe
On Fri, 22 Jan 2010 16:37:57 +0530 wrote
>Usually the material specification will require that a minimum of 87.5% of the ordered nominal wall thickness be maintained. This can be verified by blending and baseline UT. One other requirement is the "workmanlike finish". This is a subjective judgement. In either case, if buildup is required, ensure that your organization is certified to repair fittings and perform welding in accordance with approved WPS. On 2010-01-21, at 2:09, daniel iordache wrote:Hellothe better way about pittinganalyzeand to get a right decision is to contact a corrosion engineer to evaluate area according with visual and ultrasonic testing report- he will calculate base on remaining thickness, length, material spec, operation pressure, safety factor the corrosion allowance and the remainingstrength of material for corroded subject (api 31G).....other is to calculate all above according API 579.....
regadsOn Wed, Jan 20, 2010 at 11:45 PM, michael lawrence wrote:
dear sir anything biger than the calaberation notch
wich is 1mm is a defect and i do believe it would be down to the welding
engineer to make a desision as to wether or not to use the elbow i do bilieve
that there is no specific area as to how much pitting would b allowed the
decision would be yes or no or can the pitting b eliminated i.e repair welded as
a welding inspector i would have some idea as to wether or not it way be used
but would hafto come from a engineer and depending on what product would be
going through the material
regards
mike.
----- Original Message -----
From:
Gulam kader
To: materials-welding@googlegroups.com
Sent: Wednesday, January 20, 2010 9:52
AM
Subject: [MW:4105] Pitting acceptance
criteria
Dear all,
We received one 40" elbow (ASME 16.9) ASTM A 860 material having so much
pitting on full external surface. Which standard we can refer for the
acceptance criteria?
I referred in ASTM A 860, its talks about only depth of surface
discontinuity(5% of the nominal thickness), there is no detail about the
area of the pitting allowance.
Pleasehelp me on this issue. Very urgent
Regards,
Gulam Kader
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-- Daniel IordacheBureau Veritas - AngolaMechanical& Welding SurveyorMobile Ao: +244921544583Mobile Ro: +40721731728E-Mail: daniel.iordache@gmail.com
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