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#31093 - 11/04/09 12:52 AM wrc 107 & wrc 297 doubt
gipb4u Offline
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Registered: 05/18/09
Posts: 24
Loc: mumbai india
For local load analysis, wrc 107, & 297 are used to find stresses at 8 points. Is it necessary that maximum stresses occur at any of these 8 points only ?
Also, is there any provision in PVElite to include axial pressure thrust on nozzle and shell ?
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#31182 - 11/06/09 11:11 PM Re: wrc 107 & wrc 297 doubt [Re: gipb4u]
PVUSER Offline
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Registered: 10/30/09
Posts: 8
Loc: Vadodara
Can any body give me the information how can i get the value from WRC-107
Graph curve?

From which source i get that WRC-107.

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#31183 - 11/07/09 02:11 AM Re: wrc 107 & wrc 297 doubt [Re: PVUSER]
corne Offline
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Registered: 07/09/07
Posts: 401
Loc: The Netherlands
WRC = Welding Research Council
You can buy the publications on their website http://www.forengineers.org/index.html

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#31186 - 11/07/09 03:32 AM Re: wrc 107 & wrc 297 doubt [Re: corne]
PVUSER Offline
Member

Registered: 10/30/09
Posts: 8
Loc: Vadodara
Thanks crone for giving me the referance .

But i need some free resources from where i get this WRC bulletin.

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#31187 - 11/07/09 03:41 AM Re: wrc 107 & wrc 297 doubt [Re: PVUSER]
corne Offline
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Registered: 07/09/07
Posts: 401
Loc: The Netherlands
Why do people always want all documentation for free? We all have to pay for them, so just buy them.

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#31212 - 11/09/09 07:14 AM Re: wrc 107 & wrc 297 doubt [Re: corne]
Ray_Delaforce Offline
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Registered: 01/02/03
Posts: 743
Loc: Houston, TX
Hi folks

WRC 107 is subject to copyright. For this reason we cannot give it out as it would be an infringement of that copyright. I do not know the price, but WRC publications are fairly modestly priced.

The results of those curves are given in both PV Elite and CodeCalc.

With respect to the original question posed by gipbe4u the answer is that the maximum stress of the 8 reference point is given in the software. Both PV Elite and CodeCalc have provision for handling the pressure thrust and the pressure indices from ASME VIII, Division 2 for a fatigue analysis.
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Ray Delaforce
CADWorx & Analysis Solutions
Hexagon PPM

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#31225 - 11/09/09 09:41 PM Re: wrc 107 & wrc 297 doubt [Re: Ray_Delaforce]
gipb4u Offline
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Registered: 05/18/09
Posts: 24
Loc: mumbai india
bUT is it necessary that maximum stresses occur at any of these 8 points only ?
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#31244 - 11/10/09 07:37 AM Re: wrc 107 & wrc 297 doubt [Re: gipb4u]
Ray_Delaforce Offline
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Registered: 01/02/03
Posts: 743
Loc: Houston, TX
Hi gipb4u

There is no guarantee that the maximum stress will fall on one of the points. That is stated in WRC 107. However, WRC 107 has been used over the years, and has proved useful. The only alternative to the method is to go to an FEA model using a programme such as NozzlePro. That programme is available from the Paulin Research Group.
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Ray Delaforce
CADWorx & Analysis Solutions
Hexagon PPM

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#31298 - 11/12/09 04:41 AM Re: wrc 107 & wrc 297 doubt [Re: Ray_Delaforce]
gipb4u Offline
Member

Registered: 05/18/09
Posts: 24
Loc: mumbai india
Thanks a lot Mr. Ray,

I did a fea analysis of the nozzle shell junction and the maximum stresses where coming at points slighty away from the points mentiones in WRC. I also read the statment from the WRC 107.
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#31316 - 11/12/09 10:56 AM Re: wrc 107 & wrc 297 doubt [Re: gipb4u]
Ray_Delaforce Offline
Member

Registered: 01/02/03
Posts: 743
Loc: Houston, TX
Hello gipb4u

What FEA programme did you use, and did the final results come close the the value obtained using WRC 107?
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Sincerely,
Ray Delaforce
CADWorx & Analysis Solutions
Hexagon PPM

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#31357 - 11/13/09 11:44 PM Re: wrc 107 & wrc 297 doubt [Re: Ray_Delaforce]
gipb4u Offline
Member

Registered: 05/18/09
Posts: 24
Loc: mumbai india
Hello Mr. Ray,

I used Ansys 11 for the analysis. The results were not same as that obtained by the WRC 107 and 297. does WRC 107, 297 considers pressure thurst on the shell also ?
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#31379 - 11/16/09 07:42 AM Re: wrc 107 & wrc 297 doubt [Re: gipb4u]
Mukesh Offline
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Registered: 11/12/06
Posts: 125
Loc: Ahmedabad, Gujarat, India
Yes gipb4u,

WRC 107 & 297 considers pressure thurst on the shell also.

Mukesh

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#31415 - 11/17/09 08:27 AM Re: wrc 107 & wrc 297 doubt [Re: Mukesh]
Ray_Delaforce Offline
Member

Registered: 01/02/03
Posts: 743
Loc: Houston, TX
Thank you for the information gipb4u.
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Sincerely,
Ray Delaforce
CADWorx & Analysis Solutions
Hexagon PPM

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#31780 - 12/02/09 11:10 PM Re: wrc 107 & wrc 297 doubt [Re: Ray_Delaforce]
kewal(Sr. Design Offline
Member

Registered: 04/08/09
Posts: 14
Loc: mumbai
hELLO fRNDS,
i AM HAVING AN WARNING MESSAGE AS FOLLOW
Warning - The ratio, Dn/Tn (10.293) is < 20
check the limitations of WRC bulletin 297.

hOW CAN I GET OUT OF THIS.. PLEASE HELP AND SUGGEST NEED URGENT HELP

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#31786 - 12/03/09 09:55 AM Re: wrc 107 & wrc 297 doubt [Re: kewal(Sr. Design]
Mandeep Singh Offline

Member

Registered: 12/15/99
Posts: 600
Loc: Houston, Tx, USA
This is a factor of the geometry. The WRC 297 bulletin only has data for certain range of geometries. So, your answer will be lose accuracy depending upon how far it is from the limit.

What is the stress compared to the allowable.

Did you check in WRC-107 and nozzle reinforcement.

Do you have sufficient margins in the other checks.

Use your past experience.

If it is a critical application then you may go for FEA.
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Mandeep Singh
CADWorx & Analysis Solutions
Hexagon PPM

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#31793 - 12/04/09 12:20 AM Re: wrc 107 & wrc 297 doubt [Re: Mandeep Singh]
kewal(Sr. Design Offline
Member

Registered: 04/08/09
Posts: 14
Loc: mumbai
@ Mandeep

As per client requirement i cant chnage the nozzle size and shell thickness.
And also the margin availble in shell and nozzle neck thickness is very less.
As client recommanded nozzle on shell be as per WRC 297 and not for WRC 107.
I have tried with reinforcement cant find the soluton.
Kindly reply..

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#31817 - 12/05/09 05:06 AM Re: wrc 107 & wrc 297 doubt [Re: Mandeep Singh]
Mak Offline
Member

Registered: 12/12/08
Posts: 82
Loc: india
Dear kewal,

Dn/Tn is the ratio of diameter of nozzle to thicknes of nozzle. As per WRC 297 this ratio should be greater than 20 & is limited up to 100 only. (This is the limitation of WRC 297).

However, WRC 297 includes the figure (Fig. 3) for Dn/Tn = 10, which is given for smaller ratios. This allows you for Dn/tn greater than or equal to 10 but limited to 100.
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#31843 - 12/08/09 06:24 AM Re: wrc 107 & wrc 297 doubt [Re: kewal(Sr. Design]
Mukesh Offline
Member

Registered: 11/12/06
Posts: 125
Loc: Ahmedabad, Gujarat, India
Originally Posted By: kewal(Sr. Design
hELLO fRNDS,
i AM HAVING AN WARNING MESSAGE AS FOLLOW
Warning - The ratio, Dn/Tn (10.293) is < 20
check the limitations of WRC bulletin 297.

hOW CAN I GET OUT OF THIS.. PLEASE HELP AND SUGGEST NEED URGENT HELP


Check in WRCB-107 and see the results.

If your application is critical then go for FEA as said by Mandeep.

The result of WRCB-107/297 will not be adequate when geometry is not coming within its dimensional limitation.

Mukesh

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