[MW:16879] PMI on Stainless Steel Welds

[Binoy Soman]

 

Dear Experts,

 

In a project, Is it always necessary  to do PMI on all Stainless welds or whether it is a clent requirement only. Code followed is ASME B 31.1

 

S.Binoy

[Weaver, mark]

Client specified

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[c.no...@vipco-thai.com]

Dear Mr.Binoy,

 

Not necessary , it depends on project spec. and how confident in working system.  For me , we will perform PMI internally anyway to double check correct material grade and correct welding rod.

Be aware that some PMI spec. require to check Carbon on high or low carbon stainless such as 316L or 347H , etc.  Normal PMI cannot perform this check and you have to use portable spectrometer which will be much more costly.  You have to review PMI spec. and material you are welding carefully.

 

Regards,

C.Nopadon

From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of Binoy Soman
Sent: Wednesday, February 27, 2013 1:10 AM
To: material...@googlegroups.com
Subject: [MW:16879] PMI on Stainless Steel Welds

 

 

Dear Experts,

 

In a project, Is it always necessary  to do PMI on all Stainless welds or whether it is a clent requirement only. Code followed is ASME B 31.1

 

S.Binoy

--

[LOKNATH PATRA]

Client specified but Generally we do 10%-20% Pmi for all ss welds.

Regards
L.patra

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[Chaitanya Purohit]

It depends, 

-on which side you are : either client side or manufacturer / contractor side 

-how much you are worried about quality of welds

-situation : of there is only SS work is going on and only one grade and brand of consumable is being used, then it may not required (if specified in client spec then its mandatory)

- Many times manufacturers involved in SS fabrication use lower grade consumables for welding and overlay, hence it is necessary to verify the correct grade (use of 308 instead of 309, 347, 316 welds)

-many other consideration..

--

C. K. Purohit

+968 92840112

[prem nautiyal]

Hi   PMI test for SS and Alloy steel is client requirement and same is mentioned in QAP / project specs.. It is not code requirement.   Regards   Prem Nautiyal 9769316004 --- On Tue, 2/26/13, Binoy Soman <bino...@DAELIM.CO.KR> wrote:

From: Binoy Soman <bino...@DAELIM.CO.KR> Subject: [MW:16879] PMI on Stainless Steel Welds

S.Binoy

[Shashank Vagal]

Gents, It is generally understood that PMI result reliability is as low as +/- 15%. It is mostly what can be called as go/no go type of test. Can any one confirm if ASME accepts PMI (by XRF) / Spectrometry and under what conditions.  Rgds, S Vagal --- On Wed, 27/2/13, c.no...@vipco-thai.com <c.no...@vipco-thai.com> wrote:

[Vino Varghese]

Dear Binoy,

I totally agree with Mr. Nopadon. 

Just to add on, check whether PMI has been done at Manufacturer location before delivery to your location. Request for the Report. Usually, PMI is a cross verification to confirm that no mix-up of  material. This verification can be 5%-10% of total lot of same Heat No.

Regards,

Vino, Doha

[pgoswami]

Hi Binoy,

 

ASME B31.1 code does not have anything written clearly about alloy verification system.However there's a wishy washy statement under clause 136.1.1 (see below). If PMI is specified by designer as one of the required inspection techniques then the inspector have the  right to ask for it.

Traditionally PMI had been a popular inspection technique in refinery and petrochemical plant construction due to numerous types of alloys being used. Accordingly API-578 is recommends  adoption of PMI for B31.3 codes(see below).

 

With the advent of supercritical plants and use of many complex alloys in power plant constructions PMI is getting recommended by clients(electric utilities) more and more.

 

In  your case  adoption of PMI for stainless and low alloy steels is subject to "client's "requirements  or for effective inspection in shop or field.

 

PMI  is not applicable for alloy verification alone .If one has to know the weld of base metal chemistry (including  carbon content), it's an effective technique also, suject to what instrument is getting used(ArcMet or Niton XRF)

 

 

Thanks.

 

Pradip Goswami,P.Eng.IWE

Welding & Metallurgical Specialist

Ontario, Canada.

Email-p...@sympatico.ca,

pgos...@quickclic.net

 

136.1.3

Rights of Inspectors. Inspectors shall have access to any place where work concerned with the piping is being performed. This includes manufacture, fabrication, heat treatment, assembly, erection, examination, and testing of the piping. They shall have the right to audit any examination, to inspect the piping using any appropriate examination method required by the engineering design or this Code, and to review all certifications and records necessary to satisfy the owner’s responsibility as stated in para. 136.1.1.

 Verification of Compliance.

Prior to initialoperation, a piping installation shall be inspected toensure that the piping has been constructed in accordancewith the design, material, fabrication, assembly, examination, and testing requirements of this Code

 

API RECOMMENDED PRACTICE 578, Material Verification Program for New and Existing Alloy Piping Systems

The purpose of this recommended practice is to provide the guidelines for a material and quality assurance system to verify that the nominal composition of alloy components within the pressure envelope of a piping system is consistent with the selected or specified construction materials to minimize the potential for catastrophic release of toxic or hazardous liquidsor vapors.

This recommended practice provides the guidelines formaterial control and material verification programs on ferrous and nonferrous alloys during the construction, installation,maintenance, and inspection of new and existing process piping systems covered by the ASME B31.3 and API 570 piping codes. This practice applies to metallic alloy materials purchased for use either directly by the owner/user or indirectly through vendors, fabricators, or contractors and includes the supply, fabrication, and erection of these materials. Carbon steel components specified in new or existing piping systems are not specifically covered under the scope of this document.

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From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of Vino Varghese
Sent: Wednesday, February 27, 2013 10:43 PM
To: material...@googlegroups.com
Subject: Re: [MW:16894] RE: 16879] PMI on Stainless Steel Welds