WQT without WPS

[srinu p]

Dear all,

 

My contractor doing welding without approved WPS. Now they are completed welding around 50 tanks (Under Ground Storage Tanks) out of 100 no.s. 

 

Now the client is asking WPS, is there any way to solve this problem.

 

Regards 

[tugrulhan özdemir]

Hi


If you use ASME there are some standart WPSs in appendix E. If contractor says ok they can use it. If you use EN there are some standart WPSs also.

2012/11/14 srinu p <sree....@gmail.com>

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Tuğrulhan ÖZDEMİR

Metalürji & Malzeme Müh. (Y.T.U.)

U.Kaynak Mühendisi (I.W.E.)

[Shashank Vagal]

Hello Srinu, The least you can do now is prepare WPS and PQR using production welding parameters, run mechanicals as required and hope all will come OK. We had one similar case when ASME AI allowed the same under what provisions I am still not sure. He picked one WPS we had closest to the case at hand and used welder qualifications based on P Nos. and F Nos. Best regards, Shashank Vagal --- On Wed, 14/11/12, srinu p <sree....@gmail.com> wrote:

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[c sridhar]

Mr. Srinu,

Take up the matter with your client Make a fresh WPS & PQR and it is generally accepted.

Make sure that, the PQR is successfully done and this may be acceptable to your client.

sridhar.

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From: srinu p <sree....@gmail.com>
To: material...@googlegroups.com
Sent: Wednesday, 14 November 2012 3:35 PM

Subject: [MW:15929] WQT without WPS

[Richard Napitupulu]

Dear Srinu
First please clarify your position. Are you on client side or contractor side. If you in the client side and not happy with the situation I feel you have valid ground to reject the works.

But as a solution I would raise an NCR and asked for all joint to be Radiograp and UT. In addition hydrotest 100 percent.

Regards
Bonardo

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[Sudhir Kumar]

All welds shall be rejected. RT/UT & hydrostatic test are not substitute for such non-conformities.  Any construction code for any type of welds, welding procedure is mandatory.
NDE does not confirm or guarantee the integrity of weld joints. Hydrostatic test does confirm the mechanical properties of Welds as hydro test pressure will be lesser than yield & tensile strength.
Regards

On Wed, Nov 21, 2012 at 11:18 PM, Sudhir Kumar <sudhi...@gmail.com> wrote:

[Vino Varghese]

Dear Sree,

Can we know the Construction Code?

Regards

Vino-Doha

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[Vino Varghese]

Dear Sudhir,

I believe that we should always strive for positive approach without hampering the Integrity of product and delivers the final product as per service requirement.

The best part is to get the Client fully involved and run a PQR with the same parameters and recommend that PQR qualification is carried by the same welder who welded the actual job.

Yes..a non-conformance is required and attach a Corrective measure for Client further review.

This is a very serious mistake and shall not be repeated in future.

Regards

Vino-Doha

_____________________________________________________________________________________

[Sudhir Kumar]

Dear Vino

 

Your approach is very positive and highly appreciated.

 

When production welds are welded with unknown parameters by using various welders (about 50tanks welding is completed out of 100 tanks as per query) on which parameters PQR can be qualified?

 

With involvement & acceptance of client may be test coupon can be taken directly from production welds by considering each welding process & welder vise for the Mechanical testing as required for procedure qualification. Further test coupon removal areas shall be attached with the insert plate.

 

By doing so cannot be estimated the welding parameters but can be ensured integrity and mechanical properties of weld.

 

With my past experience none of client may accept any alternate proposal for such non-conformity, even none of ASME code specify any alternative proposal/exemptions for the same.

 

Regards

Sudhir Kumar

[G Sreenivas Rao]

Dear all
if the welding is done with out having WPS & PQR and WPQ, ( this
is not acceptable to any clients) in this case client is aslo not
raised the point nor contractor taken it seriously and 50 tanks were
completed which is not acceptable
To solve this problem we can have the WPS &PQR and WPQ inline with
welded tank welds, my asnwer is as follows
1. identify the welders who welded the completed tanks welding
2.write down the parameters used while welding the tanks ( In WPS
format as per ASME Sec. IX or API norms)
3. the test coupons shall be taken from cut outs of tnaks man hole
openings and shall be followed regurlar process inline with welding
code( ASME /API) in presence of accepting authority ( client/ client
representaive). then this problem will resoved. and the WPS, PQR and
WPQ shall be be approved by client and after satisfacotry testing
of the samples.
the tanks can be cleared for further process.

Regards

GSR

[Vino Varghese]

Dear All,

We are again missing the very basic, what is the Construction Code? Where are these tanks going to be used? Is it atmospheric and non-coded Tanks? It is possible that these tanks are non-critical and the contracts does not state the Code specific requirement. 

The design should specifically quote for the welding requirement. 

There are numerous ways and need to openly discussed with Client about all possible approach. The end user need to agree for corrective measure based on the process and design parameters.

Regards

Vino-Doha