PMI Testing -ss316

[Sameer]

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 .

[Kannayeram Gnanapandithan]

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

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[Bien ND]

Hello,

Plate ASTM A240 TP316: refer tolerance in ASTM A480 Table A1.1

Pipe ASTM A182 TP316, refer tolerance in ASTM A961 Table  1.

>Tolerance: Ni 0.15% content 

So, Ni reading 9.86% is acceptable.

Regards

Bien ND

[PRAMODH NAIR]

Hello,

If you checking on the weld, it should be the A number mentioned in WPS.

If you checking on the base material it should be respective base material values (Example A182 316, A312 316 Etc). Refer SEC II A.

Thanks with warm regards,

Pramodh M.R

Sr.Inspector (Welding/Coating)

[Harish Kannepalli]

Hi,

    PMI technique is by xrf, which is semi quantitative in nature. The standards refer to test methods which are accurate than PMI, hence those tolerances cannot be applied for PMI.

[Carlos Arturo Oliveros Diaz]

ASME II A, B,C  has a table for each material and show tolerance  CR 18-20, NI 11-14  ETC shall be in that range.

Carlos Arturo Oliveros Diaz  +573023482020

            ws+584245923932

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De: material...@googlegroups.com <material...@googlegroups.com> en nombre de Harish Kannepalli <harishka...@gmail.com>
Enviado: jueves, 28 de marzo de 2019 7:08 a.m.
Para: material...@googlegroups.com
Asunto: Re: [MW:29410] PMI Testing -ss316

 

[pradip kumar Sil]

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

[Kannayeram Gnanapandithan]

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

[PGoswami]

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:pgos...@quickclic.net,pradip....@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).

[munee...@gmail.com]

SAES-A-206

10 Acceptance Criteria

10.1 For acceptance, it must be demonstrated that materials contain the amounts of alloying elements shown in the material specification. Alloys shall be acceptable if the alloying elements are each within 10% of the specified range of values.

10.2 Welds with consumables that match, or nearly match, the base metal composition shall be within ±12.5% of the ranges allowed in ASME SEC IIC for each element.

11 Rejection Procedures

11.1 If the PMI testing results fall outside the acceptable range using a method described in Section 8, the Equipment Manufacturer or the Fabricator, as applicable, has the option to conduct a more accurate analysis at his own expense to determine the component acceptance such as obtaining a chemical analysis performed by an independent testing laboratory. The alternative test method or independent laboratory must be acceptable. The results of the more accurate test method or independent chemical analysis shall govern.

11.2 If any component or weld is found unacceptable, it shall be replaced and the replacement shall be alloy verified in accordance with this standard.

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Regards

Muneeb

[Vinay Thattey]

Is it plate . I assume it is ASTM-A-240 . You R right . Minimum requirement is 10 % . But what is the error or accuracy of PMI equipment . In my view , it can be accepted

[Jarod]

What is the difference between E347 & E 347 L

[George Dilintas]

L stands for low carbon 

Στις Τρί, 14 Μαΐ 2019, 07:21 ο χρήστης Jarod <taz...@gmail.com> έγραψε:

What is the difference between E347 & E 347 L

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