[MW:561] Re: Tolerance for Dog leg

The dog leg is terminology normally used by European/ American pipeline inspectors for "mitre bend" in pipeline construction (cross country). These mitre bends/ deflection ( dog leg) are due to misalignment between two pipes (butt joint/ girth welds).

These type of un intentional mitre bends upto 3°  are acceptable as per ASME B 31.4 Article 406.2.2 & ASME B 31.8 Article 841.2.3.2.

 

Dogleg terminology not generally used for the straightness of a single pipe (not used for manufacturing of line pipe).

 

best regards,

 

Sanjeevan

Gulf Petrochemical Services, Muscat, Oman

 

----- Original Message -----

From: Sankepalli R.S.Reddy

To: materials-welding@googlegroups.com

Sent: Monday, February 11, 2008 8:40 PM

Subject: [MW:557] Re: Tolerance for Dog leg

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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