Hi, Please find herewith the attached file might be useful to you.(FAQ for DNV-OS-F101 Submarine Pipelines Systems ) What constitutes a mitred joint and what constitutes angular mis-alignment? Section 7, Paragraph G106 states that mitred bends are not permitted.
However, Section 7, Paragraph B700 references ASME VIII & BS5500 or other industry standard with regard to components fabricated by welding. ASME B31.8, Section 841.232 paragraph a) also states that mitred bends are not permitted but qualifies that angular misalignments of less than 3° is not considered a mitre. So, what is the interpretation of OS-F101? Is an angular misalignment of less than 3° acceptable?" DNV OS-F101 is intended to be applied to subsea pipelines and alignment is in the majority of cases obtained by the use of internal or external alignment clamps. Requirements to angular misalignment of a pipeline follows from Section 5, H200 Pipe Straightness and is hence limited by design considerations from case to case.
A mitred bend is made by introducing on purpose an angular misalignment between lengths of pipe. Such bends are not acceptable regardless of the angular misalignment between adjacent pipes. Back to Top
Leif Collberg
Copyright © Det Norske Veritas. All rights reserved.
Revised: September 10, 2001.
Thanks & Regards,
(Karthik)
Karthikeyan.S QA/QC Manager Getabec Energy Co.,Ltd. 379,Moo6,Soi8,Nikhomphatana, Rayong-21180, Thailand. Phone: 0066 38 897035-8 (Off) Fax: 0066 38 897034 Hand Phone: 0066 892512282
--- On Sat, 10/1/11, antony jenis <antonyjenis@gmail.com> wrote:
From: antony jenis <antonyjenis@gmail.com>
Subject: Re: [MW:12599] Need the miter angle detail from DNV code
To: materials-welding@googlegroups.com
Date: Saturday, October 1, 2011, 11:19 PM
Dear manoj, Thanks for your reply I have the detail about miter cut in other codes. But i need the DNV F101 or other DNV code says any thing about miter cut. If anybody have related miter cut detail means just update me.
Regards
antony Sr.inspection engineer.
On Sat, Oct 1, 2011 at 4:22 AM, manu <manojkumar.dme@gmail.com> wrote: Dear Antony; please provide how cut mitter are you planning to do ; i can give you the cut back dimension if you provide the correct details Regards manoj\
Dear Friends,
If anybody have the detail about the miter cut & angle detail from the DNV code please send me the detail. here we have in offshore pipeline we have 30 degree angle miter joint . Material;API 5L X65, dia:48 inch. thickness;20 mm
-- Thanks & Regards Antony Jenis Offshore Sr.Surveyor / Representative, GERMINSCHER Lloyd-NOBLE DENTON IRAQ CRUDE OIL EXPANSION PROJECT,IRAQ OFFSHORE, LIGHTEN DSV, ORANDA-1 UAE Mobile No: 00971505624002 --
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