RE: [MW:29422] PMI Testing -ss316

Hi,

Please see the highlighted text. It does not say what technique was adopted. PMI could be done by XRF and OES techniques. Assuming this was done by XRF, this technique  could yield erratic results. More number of spots/reading, better is the accuracy. How many spots were taken?

If would be advisable to test the sample with both XRF and OES and then come to conclusions

Also see below the recommendations from API-578 and act accordingly.

Thanks.

 

 

P.Goswami.P.Eng, IWE.

Independent Welding & Metallurgical Specialist

Linkedin: https://www.linkedin.com/in/pradip-goswami-2999855/

Email:pgoswami@quickclic.net,pradip.goswami@gmail.com

Cell/Whasapp:1-905-9793232

 

7 Evaluation of Testing Results

7.1 Material Acceptance Methods

The owner/user may elect any one of the following methods of material acceptance.

a) Materials can be confirmed to contain the nominal amounts of alloying elements specified in the relevant

materials specification (e.g. ASME Section II or ASTM specifications).

b) Materials can be classified through a qualitative sorting technique (see 6.7) to establish the conformance

with the intended material.

c) When PMI indicates that alloying elements are outside the ranges indicated in the material specification,

the owner/user may still choose to allow the use of the tested materials in situations where a person

knowledgeable of the appropriate damage mechanisms confirms that the material will perform

satisfactorily in the service.

d) If testing using one of the portable or qualitative analysis methods leads to the potential rejection of a

component, a more accurate analysis may be used to determine component acceptance (see

Section 6).

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Kannayeram Gnanapandithan
Sent: March 29, 2019 7:39 AM
To: materials-welding <materials-welding@googlegroups.com>
Subject: Re: [MW:29418] PMI Testing -ss316

 

Ref ASME SEC I, Non Mandatory Appendix B, 

THANKS & BEST REGARDS,

KG.PANDITHAN, BE, IWE,  CSWIP 3.1,

ISO 9712 Level 2 in VT,

ASNT-Level II in PT,MT,RT & UT,

LA ISO 9001-2015,

International Welding Engineer. 

CONSULTANT-WELDING & QUALITY

Mobile no: +919940739349

 

 

On Fri, Mar 29, 2019 at 9:05 AM pradip kumar Sil <pradipsil@gmail.com> wrote:

Check PFI STANDARD ES 42

 

Materials shall contain the amount of
alloying elements specified in the
applicable ASME/ASTM specification.
Alloy materials, alloy castings and alloy
welding filler materials (tested in their
raw form or with the alternative described
in para. 5.7) shall be acceptable under this
procedure if each of the major alloy
elements is detected to have a value no
less than 10% below the minimum value
nor more than 10% above the maximum
value specified by the governing material
specification

 

According this your material is accepted

 

On 28 Mar 2019 3:51 pm, "Kannayeram Gnanapandithan" <kgpandithan@gmail.com> wrote:

what is the tolerance for PMI values

THANKS & BEST REGARDS,

KG.PANDITHAN, BE, IWE,  CSWIP 3.1,

ISO 9712 Level 2 in VT,

ASNT-Level II in PT,MT,RT & UT,

LA ISO 9001-2015,

International Welding Engineer. 

CONSULTANT-WELDING & QUALITY

Mobile no: +919940739349

 

 

On Thu, Mar 28, 2019 at 3:44 PM Sameer <sameer.landgebv@gmail.com> wrote:

Dear Experts ,

During PMI testing of SS316 material Ni observed - 9.86% , required range is 10-14%.

observed value will be accepted or not . Please provide your valuable comments .

 

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