Please refer to PFI standard ES-3, linear tolerance given as +/- ¼” (6mm) for dia 24 to 36”, I assume your pipe falls in this dia range from the photograph.
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Sankepalli R.S.Reddy
Sent: Tuesday, February 12, 2008 4:07 PM
To: materials-welding@googlegroups.com
Subject: [MW:565] Re: Tolerance for Dog leg
Here by attached the photo related to typical dog leg.
We are facing this problems in construction stage of plant piping. Allowing 3 Deg as tolerance appears to be more liberal and in lines like relief /blow down where slope of the line is to be maintained process point of view.
Thank you very much to all of you for your prompt reply.
Regards
Srs reddy
Saudi Aramco
On 2/11/08, Shyam Herur <herur.shyam@gmail.com> wrote:
Can you specify the pipe spec and what it is used for ? Since you are referring to "line pipe" I presume its the pipe covered in spec API 5L. However I did find an abstract which goes" usually out of straightness of pipe usually follows a log normal distribution with diametre, and, as would be expected the larger the diametre of the pipe, the straighter is the pipe. API 5L allows 24mm in a 12m joint. usually it is possible to obtain pipe to 12mm in 12m. to reduce total cost over specification of straightness should be avoided".
also refer to API 5L for further details.
On 2/11/08, Sankepalli R.S.Reddy <sankepalli.rsreddy@gmail.com> wrote:
It is the out of straightness of line pipe. The out of straightness may be due to weld distortion at joint locations or due to improper fitup.
regards
On 2/11/08, Raghuram Bathula <raghurambathula@gmail.com> wrote:
Can you please explain the term Dog leg, i have no idea what it is?
Is it a term related to steel structure? type of stair case
arrangement?
On Feb 11, 7:39 pm, "Sankepalli R.S.Reddy"
<sankepalli.rsre...@gmail.com> wrote:
> *Dog leg or out of alignment of line pipe:*
> **
> Can any body gives permissible tolerance for Dog leg. Whether any standard
> is covering this tolerance.
>
> Thanks and regards
>
> S. Rama subba reddy
>
> Inspection Engineer
>
> Khursaniya Gas Project, KSA
>
> Bldg 7, Cu 1
>
> Ph no: 6770120
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