You should follow API 650 for tank consrtuction , not ASME code .
In my best of my knowledge , you need to refer to API 650 and follow
tolarances which was mentioned in API 650 .
Thank you
Suresh
On 2/26/11, Abdul Wahab <awengineer@gmail.com> wrote:
> Dear All,
>
> I am Abdul Wahab working in KSA as QA/QC Inspector, I have an issue
> which is confusioning me. Below there is copy of Paragraph of API 650.
> Plumbness, peaking, banding & flat spot discussed in this & tolerances
> are provided but along with tolerance of API 650, also refering to
> ASTM standards, those standards have tolerances aproximately a double
> values as compared to API 650 Tolerances. Do we need to follow those
> as ASTM is not a tank construction code but provide guidance about
> matrial manufacturing,testing & handling etc.
>
> We have Banding Value for 6 mm Plate of 13 mm max, can we consider a
> dent as a banding problem in tank shell.
>
> Please see below & advice.
>
> 7.5.2 Plumbness
>
> a. The maximum out-of-plumbness of the top of the shell relative to
> the bottom of the shell shall not exceed 1/200 of the total
> tank height. The out-of-plumbness in one shell course shall not exceed
> the permissible variations for flatness and waviness as
> specified in ASTM A 6M/A 6, ASTM A 20M/A 20, or ASTM A 480M/A 480,
> whichever is applicable.
>
>
>
> 7.5.4 Local Deviations
>
> c. Flat spots measured in the vertical plane shall not exceed the
> appropriate plate flatness and waviness requirements given in
> 7.5.2.
>
> If there is any confusion to understand, please ask.
>
>
> Abdul Wahab
> Mechanical Inspector
> KSA
>
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--
Thanks & Best Regards,
Suresh
Mobile No: 91-92 92 905 905
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The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
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