displacement of wellhead

10/10/2014 Displacement of Wellhead - Intergraph CADWorx & Analysis

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Displacement of WellheadAnalyzer

Member

Registered:09/17/11 Posts: 8 Loc: World

HiHow should be considered the movement of wellhead inoffshore project in input of Caesar II file and load casesaccording to below criteria?“For pipe work connected to the wellhead, verticalmovements at the Christmas tree of+150 mm and -50 mm will be catered for. Additionally,horizontal movements of ±25mm have been considered.”

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Re: Displacement of Wellhead [Re:Analyzer]

paldex Member

Registered:04/30/08 Posts: 101 Loc: Qatar

Hi Analyzer,

Please refer Det Norske Veritas Recommended Practice,DNV-RP-D101 - Structural Analysis of Piping Systems.This may give you more information for your case. It iseasy download from google search...

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danb Member

Registered:04/22/05 Posts: 1165 Loc: ...

As "externally imposed displacements"

Define them as follows (example):

D7 (dx=25, dy=0, dz=0)D8 (dx=0, dy=50, dz=0)D9 (dx=0, dy=0, dz=25)

then combine the displacements as follows and add themat the end of W+T1+P1 (OPE)

D7+3D8-D7+3D8D9+3D8-D9+3D80.707D7+0.707D9+3D8

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#44783 - 09/18/11 10:41 AM

#44790 - 09/18/11 12:40 PM

#44792 - 09/18/11 12:50 PM

-0.707D7+0.707D9+3D80.707D7-0.707D9+3D8-0.707D7-0.707D9+3D8D7-D8-D7-D8D9-D8-D9-D80.707D7+0.707D9-D8-0.707D7+0.707D9-D80.707D7-0.707D9-D8-0.707D7-0.707D9-D8

After you built these additional 16 operating load cases,construct your expansion load cases. That's it.

Regards,

Edited by danb (09/18/11 10:45 AM)

_________________________Dan

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danb Member


DNV-RP-D101 is so good that I placed on my desktop.

_________________________Dan

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Analyzer

Member


The pipe connecting to this wellhead has 2 designtemperatures(-30&100 degrees Celsius),Do thesedisplacements(+25,+150 & -25,-50) happen attemperatures (-30 & +100) respectively ?

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danb Member


I do not think so. Maybe two sets: 16 loadcases at T1 and16 loadcases at T2 are more appropiate.Ask process / mechanical enginner about this.

Regards,

_________________________Dan

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#44804 - 09/19/11 07:15 AM

#44805 - 09/19/11 07:41 AM

#44809 - 09/19/11 01:07 PM

#44817 - 09/19/11 05:15 PM


Analyzer

Member


what is the cause of these displacements of wellhead?(temperature or wave)

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danb Member


MoverZ can give more details:

http://65.57.255.42/ubbthreads/ubbthreads.php?ubb=showflat&Number=40004&page=1

Apart of this, go talk with the specialist. You belong to ateam. The person that give you the information shouldknow (I suppose ) the source of displacements.

Regards,

Edited by danb (09/19/11 07:42 AM)

_________________________Dan

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Analyzer

Member


Thanks for your reference,do you have any reference for allowable load of x-masstree(wellhead)?

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danb Member


No, I do not have. I think API have something but I do notremember well.The best thing you can do is to contactyour manufacturer and to work with him. They want tohelp you because they also do not want trouble.

Regards,

Edited by danb (09/19/11 05:18 PM)

_________________________



Hop to: CAESAR II Go

Dan

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