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
On Sat, Nov 24, 2012 at 7:35 AM, G Sreenivas Rao <gsrinivasg3@gmail.com> wrote:
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
On Fri, Nov 23, 2012 at 3:34 PM, Sudhir Kumar <sudhir18092@gmail.com> wrote:
> 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
>
>
> On Thu, Nov 22, 2012 at 2:46 PM, Vino Varghese <vinopvarghese@gmail.com>
> wrote:
>>
>> 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
>>
>>
>> _____________________________________________________________________________________
>>
>> On Wed, Nov 21, 2012 at 11:36 PM, Sudhir Kumar <sudhir18092@gmail.com>
>> wrote:
>>>
>>> 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 <sudhir18092@gmail.com>
>>> wrote:
>>>>
>>>>
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>>
>>
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>
>
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