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#13639 - 10/16/07 01:48 AM how to end cap model using caser
pktmurugan Offline
Member

Registered: 10/15/07
Posts: 43
Loc: INDIA
hai,
i am new commer to this fourms..i want to know how to model the end cap using caser..


thank you to all....

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#13648 - 10/16/07 06:41 AM Re: how to end cap model using caser [Re: pktmurugan]
Richard Ay Offline
Member

Registered: 12/13/99
Posts: 6226
Loc: Houston, Texas, USA
1) You've posted this in the wrong Forum. I'm moving this to the CAESAR II Forum.


2) You don't model "end-caps". CAESAR II evaluates the overall system behavior using the 3D Beam Element, with the assumption that the response of the system is dominated by bending. "End-caps" are irrelevant in this analysis - just end (stop) the model there.
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Regards,
Richard Ay - Consultant

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#13667 - 10/16/07 11:21 PM Re: how to end cap model using caser [Re: Richard Ay]
pktmurugan Offline
Member

Registered: 10/15/07
Posts: 43
Loc: INDIA
if we are not add endcap we loose some system weight and also some length.any other alternate for this one..

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#13670 - 10/17/07 12:56 AM Re: how to end cap model using caser [Re: pktmurugan]
bom Offline
Member

Registered: 06/23/07
Posts: 285
Loc: Manila, Philippines
hi,

if your so theoretical then model a rigid and the weigth of the cap on it.
the lenght is not necessary.
sick


Edited by bom (10/17/07 12:57 AM)
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BOM

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#13674 - 10/17/07 06:30 AM Re: how to end cap model using caser [Re: bom]
John C. Luf Offline
Member

Registered: 03/25/02
Posts: 1110
Loc: U.S.A.
If one takes a cup of water from the worlds oceans then what effect will that have???

THINK of what you are doing this is a simplified analsysis and I cannot for the life of me think of one instance where a caps weight and volume would be critical to a systems design.

A Flange and Blind Flanges weights would be significant but not a welding cap....
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Best Regards,

John C. Luf

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#13676 - 10/17/07 07:44 AM Re: how to end cap model using caser [Re: John C. Luf]
bom Offline
Member

Registered: 06/23/07
Posts: 285
Loc: Manila, Philippines
grin that's Sir John...
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BOM

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#13678 - 10/17/07 07:55 AM Re: how to end cap model using caser [Re: bom]
Loren Brown Offline
Member

Registered: 10/18/01
Posts: 285
Loc: Houston, TX
"If one takes a cup of water from the worlds oceans then what effect will that have???"

Answer: Reduce Global Warming! So get out there with your cups to do your part!
_________________________
Loren Brown
Director of Technical Support
CADWorx & Analysis Solutions
Intergraph Process, Power, & Marine
12777 Jones Road, Ste. 480, Houston, TX 77070 USA

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#13697 - 10/17/07 10:04 PM SUSTAINED LOAD CASE [Re: pktmurugan]
pktmurugan Offline
Member

Registered: 10/15/07
Posts: 43
Loc: INDIA
we are doing high pressure and low temperature gas line analysis..in this analysis we facing sustained load case problem becase of pressure..we gave the support and solve the problem..in that analysis we gave support not only in +y direction we gave x direction restrained also..with out x restrained also the problem is solved..what is the difference b\w those two cases????...

thank you to all....

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#13698 - 10/18/07 12:35 AM Re: SUSTAINED LOAD CASE [Re: pktmurugan]
anindya stress Offline
Member

Registered: 04/12/04
Posts: 493
Loc: London, UK
If you have a pressure related high stress and not bending related , then this can be solved by either reducing the pressure or by increasing the thickness, this cannot be solved by increasing supports. Pl. check the "stress extended" report to undestand if pressure induced axial stress was the problem or bending induced. My understanding is that you had bending related problem and not due to pressure .

Also pl. write your question in proper english and complete sentences , so that others can understand what you are saying.

Regards
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anindya

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#13732 - 10/18/07 10:43 AM Re: SUSTAINED LOAD CASE [Re: pktmurugan]
Dave Diehl Offline
Member

Registered: 12/14/99
Posts: 2382
Loc: Houston, TX, USA
Perhaps you are including the Bourdom pressure effects in your analysis? If so, then restraints may affect stress since these restraints will control Bourdon deflection and related bending.
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Dave Diehl

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#13748 - 10/19/07 12:05 AM Re: SUSTAINED LOAD CASE [Re: Dave Diehl]
pktmurugan Offline
Member

Registered: 10/15/07
Posts: 43
Loc: INDIA
sorry anindya for my sentence error.i try to make sentence correctly. i want one clarification from your answer .how the bending happen?
what i feel bending is happen due to sustainde loads(weight,pressure,etc.,),so that only i mentioned the problem may come because of pressure(pressure is consider as a sustained load).

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#13749 - 10/19/07 12:07 AM Re: SUSTAINED LOAD CASE [Re: anindya stress]
pktmurugan Offline
Member

Registered: 10/15/07
Posts: 43
Loc: INDIA
sorry anindya for my sentence error.i try to make sentence correctly. i want one clarification from your answer .how the bending happen?
what i feel bending is happen due to sustainde loads(weight,pressure,etc.,),so that only i mentioned the problem may come because of pressure(pressure is consider as a sustained load).

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#13750 - 10/19/07 12:40 AM Re: SUSTAINED LOAD CASE [Re: pktmurugan]
anindya stress Offline
Member

Registered: 04/12/04
Posts: 493
Loc: London, UK
Do you think pressure can create bending ( unless of course you are considering bourdon effect which is typically treated as a secondary effect analogous to thermal expansion) ? Bending is created by dead wt. of pipe along with wt. of fluid, valves, insulations etc. Honestly, do you really need to ask this question to find out how bending is created in piping systems? You should know it from a course of Strength of materials which you must have taken ( I presume you hold an engineering degree/ diploma).

My advise for you will be to:

1) Read/Brush up Strength of materials.

2) Read B31.3/B31.1 code.

3) Improve your english.

4) If you can't do the above three ,do something else other than pipe stress analysis.

Regards
_________________________
anindya

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#13751 - 10/19/07 12:48 AM Re: SUSTAINED LOAD CASE [Re: anindya stress]
pktmurugan Offline
Member

Registered: 10/15/07
Posts: 43
Loc: INDIA
thank you for your advice.

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#13754 - 10/19/07 08:20 AM Re: SUSTAINED LOAD CASE [Re: pktmurugan]
Loren Brown Offline
Member

Registered: 10/18/01
Posts: 285
Loc: Houston, TX
We do not require our customers to speak perfect English. Please refrain from this criticism, as it is a derogatory and ethnocentrist.
_________________________
Loren Brown
Director of Technical Support
CADWorx & Analysis Solutions
Intergraph Process, Power, & Marine
12777 Jones Road, Ste. 480, Houston, TX 77070 USA

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#13867 - 10/24/07 06:06 AM Re: SUSTAINED LOAD CASE [Re: Loren Brown]
pktmurugan Offline
Member

Registered: 10/15/07
Posts: 43
Loc: INDIA
Appendix 1

Hydrostatic Test
Case1 (HYD) = WW+HP+F1
Operating plus PSV Relief Load
Case2 (OPE) = W1+D1+T1+P1+F1+F2
Case3 (OPE) = W1+D2+T2+P1+F1+F2
Sustained Case
Case4 (SUS) = W+P1+F1
Sustained plus Wind
Case5 (OCC) = W+P1+F1+WIN1
Case6 (OCC) = W+P1+F1+ WIN2
Operating plus Wind
Case7 (OPE) = W1+D1+T1+P1+F1+WIN1
Case8 (OPE) = W1+D1+T1+P1+F1+WIN2
Thermal Case
Case9 (EXP) = Case2 Case4
Case10 (EXP) = Case3 Case4

Appendix 2

Hydrostatic Test
Case1 (HYD) = WW+HP
Operating Case
Case2 (OPE) = W1+D1+T1+P1+F1
Case3 (OPE) = W1+T2+P1+F1
Sustained Case
Case4 (SUS) = W+P1
Sustained plus Wind
Case5 (OCC) = W+P1+WIN1
Case6 (OCC) = W+P1+ WIN2
Operating plus Wind
Case7 (OPE) = W1+D1+T1+P1+F1+WIN1
Case8 (OPE) = W1+D1+T1+P1+F1+WIN2
Thermal Case
Case9 (EXP) = Case2 Case4
Case10 (EXP) = Case3 Case4

from the above two case the load F1 uses in both cases but the second case do not include the F1 in the Hydrostatic Test,Sustained Case.why?..i want some idea about those two case(only based on the load F1)..normally the load is to be consider in Hydrostatic Test and Sustained Case(if may wrong).please give the solution..

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#13869 - 10/24/07 06:36 AM Re: SUSTAINED LOAD CASE [Re: pktmurugan]
John C. Luf Offline
Member

Registered: 03/25/02
Posts: 1110
Loc: U.S.A.
Appendix 1 ? 2? F1? F2? I am puzzled and bewildered
_________________________
Best Regards,

John C. Luf

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#13872 - 10/24/07 06:48 AM Re: SUSTAINED LOAD CASE [Re: John C. Luf]
Richard Ay Offline
Member

Registered: 12/13/99
Posts: 6226
Loc: Houston, Texas, USA
pktmurugan

Please do not "double post".

Also, this should really have been a different topic.
_________________________
Regards,
Richard Ay - Consultant

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#13902 - 10/24/07 09:45 PM Re: SUSTAINED LOAD CASE [Re: Richard Ay]
pktmurugan Offline
Member

Registered: 10/15/07
Posts: 43
Loc: INDIA
ok.we account the load(example;pressure valve relief load or well head displacement load)are come in the all the cases of stress analysis.in my previous problem they took the load in the operating load case only(Appendix 2)why?..the load above mentioned are should taken in the Hydrostatic Test and Sustained Case also...why..any reason for this one..

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#13948 - 10/26/07 02:54 AM Re: SUSTAINED LOAD CASE [Re: pktmurugan]
PKU Offline
Member

Registered: 08/18/06
Posts: 78
Loc: Aberdeen
Anindya is trying to help the newcomer to forum and his advise to ask the questions specific and clear so that the forum member can understand and respond. Otherwise member of the forum will try to avoid reading such type of questions and also it may happen, member can shift to other forums.
I appreciate the newocomers curiosity to learn the things fast, they should have patience, investigate as much as they can on their own and place the questions to the experienced members of this forum.
I hope the beginers to this forum can understand the views of experienced members.
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PKU

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