Dear Abdul Wahab,
You are right, API 650 referred his users to several ASTM standard specifications, but if you refer to those ASTM, you will find the ASTM dimensional tolerances are related to the individual components (such as a sheet of plate), it means that for raw components and components prefabrication you should refer to relevant ASTM standard specifications, but for the tank fabrication and assembly you should follow the requirements
Hope the above clarification will be useful,
Regards,
Karandish
From: Abdul Wahab <awengineer@gmail.com>
To: materials-welding@googlegroups.com
Sent: Sat, 26 February, 2011 4:42:55 PM
Subject: Re: [MW:10024] Tank Peaking/Banding Issue, API 650
Dear Sir,
Thank you very much for replying, but problem is that API 650 by itself refering to mentioned standard like ASTM A 6M etc.
Please advice,
Abdul Wahab
On Sat, Feb 26, 2011 at 3:24 PM, Suresh <bobsuresh24@gmail.com> wrote:
Hii Abdul ,
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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