Re: [MW:19079] Tank annular bottom plate welding visual inspection

Dear All,
Yes i agree with Mr. Perumal, as we also done 10 % RT In annular
bottom plate and it is possible.

Thanks,
Bala

On 10/24/13, Perumal Govindan <perumalgovindan@gmail.com> wrote:
> Take radiography of an annular plate and interpret as per API 650 or as per
> code / as per client requirement.
>
> Further refer below for more info which is mentioned in API 650,
>
> 8.1.2.9 When bottom annular plates are required by5.5.1, or by M.4.1, the
> radial joints shall be radiographed as follows:
> (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 removable back-up bar,
> one spot radiograph shall be taken on 50% of the radial joints. Extra care
> must be exercised in the interpretation of radiographs of single-welded
> joints that have a permanent back-up bar. In some cases, additional
> exposures taken at an angle may determine whether questionable indications
> are acceptable. The minimum radiographic length of each radial joint shall
> be 150 mm (6 in.). Locations of radiographs shall preferably be at the
> outer edge of the joint where the shell plate and annular plate join.
>
> P Govindan
>
>
> On Thu, Oct 24, 2013 at 12:32 PM, Sam <onlyprivate2007@gmail.com> wrote:
>
>> dear experts,
>>
>> During weld visual inspection of storage tank annular bottom plate butt
>> joints welding with backing strip, i found some length (50 mm) with
>> excess
>> penetration and Burn through (root concavity) on backside (soil side). it
>> means it is on backing strip side.
>>
>> annular plate thickness = 10 mm
>> backing plate thickness = 3 mm
>>
>> 1) may be burn through defect is only in backing strip or it may extend
>> up
>> to annular plate ?
>>
>> 2) i have removed excess penetration from backing strip side. we can see
>> some fusion problem at backstrip. but is there chance it will extend upto
>> annular plate ?
>>
>> How will we evaluate this defects ?accept or reject. because we may got
>> full penetration for annular plate and defects are in only backing strip.
>> it is very difficult to remove full joint and reweld with new backing
>> strip.
>>
>> regards,
>> sam.
>>
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