Re: [MW:24258] Above ground storage tank

Dear Experts,

As per API 650, the following s has to be followed. And no where in
API it is mention replacement of RT to UT.

As per API 650 Cls 8.1.29, after Weld visual inspection necessary
Radiography should be carried out.

a) For double-welded butt joints, one spot radiograph shall be taken
on 10 % of the radial joints.
b) For single-welded butt joints with permanent or removal backing
strip, one spot radiograph shall be taken on 50 % of the radial
joints.
The minimum radiographic length of each radial joints shall be 150 mm.
Locations of radiographs shall be at the outer edge of the joint where
the shell plate and annular plate joints.
Thanks & Regards,
Balamurugan M,
L&T,
QA/QC Inch,
INDIA.



On 2/10/16, tugrulhan özdemir <tugrulhan9@gmail.com> wrote:
> Hello,
>
>
> We use the same method, i mean ceramic temporary backing for annular to
> annular joints. Ceramic strip backing is temporary so there will no
> settlement of backing in asphalt of ring. You can use SAW as well.
>
>
> 2016-02-07 10:48 GMT+02:00 tahir alam <tahiralam007@gmail.com>:
>
>> Dear expert
>>
>> we have contract to construct storage tank in the refinery.
>> Here client is telling us not to put backing strip while annular butt
>> joint welding and after welding do radiography of joint and they are
>> telling to put ceramic baking material bottom side of annular plate.
>>
>> pls let me know is it possible to do so.And kindly let me know the name
>> of
>> ceramic material and whats the function for this.
>>
>> *Best Regards*
>> *Tahir Alam*
>>
>> *Planning Engineer*
>> *Agam Tank Maintenance Group *Mobile : +(965)5150-1509
>>
>>
>>
>> --------------------------------------------------------------------------------
>> Site Office : +(965)2388-3614
>> Head Office : +(965) 2398-5381l2
>> Fax : +(965) 2398-8312
>> P.O.Box : 9390 Ahmadi, 61004 Kuwait
>> Email : tahiralam007@gmail.com
>> Website : www.agamltd.com
>> -------------------------------------------------------------
>>
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> --
>
> Saygılarımla / Regards
>
>
> Tuğrulhan ÖZDEMİR
>
> API 653 AI, Welding & Materials Eng.
>
> ASNT VT, PT, MT, RT L-II
>
> +90 539 747 2676
>
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