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#26834 - 04/21/09 11:21 PM WRC107/WRC297 Doubts
Shabeer Offline
Member

Registered: 12/26/07
Posts: 266
Loc: india
Dear all,

While doing Nozzle calculation with WRC107 im getting a warning that " Ratio of Pad Radius / Rm = 0.73 This is not between 0.01 and 0.571"


While doing Nozzle calculation with WRC297 (Same Vessel) im getting a warning that " Dn/ Tn = 15.336 < 20 Check the limitations in WRC bulletin 297"

Do it have any problem as my vessel has been fabricated?

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#27073 - 04/30/09 12:34 AM Re: WRC107/WRC297 Doubts [Re: Shabeer]
corne Offline
Member

Registered: 07/09/07
Posts: 401
Loc: The Netherlands
Both WRC codes have limitations on their usage because of the range of the graphs given in both codes. If you're outside the scope of the code it depends on which side of the graph you are if the results are still reasonable or not.

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#27503 - 05/18/09 04:28 AM Re: WRC107/WRC297 Doubts [Re: corne]
gipb4u Offline
Member

Registered: 05/18/09
Posts: 24
Loc: mumbai india
while doing nozzle calculations using wrc 107/297 if we are outside the range of graphs then how to proceed with the calculations and how to validate the calculations
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P08IP708

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#27508 - 05/18/09 07:55 AM Re: WRC107/WRC297 Doubts [Re: gipb4u]
Mandeep Singh Offline

Member

Registered: 12/15/99
Posts: 600
Loc: Houston, Tx, USA
The more you are out of the range of WRC-107/297, the less accurate the results will be.

So, you should see the curve in the WRC-107/297 bulletins to check it.

You should also try the other methods, nozzle reinforcement, App. 1-10/1-7 for large nozzles, code minimum wall thickness, WRC-297, WRC-368 and most important your experience.

In my opinion, if the curves are not exceeded by much and if the stresses are well below the allowables then the design probably is ok. So, you have to utilize your prior design experience.

Otherwise, use a finite element analysis program to check that nozzle.

Another aspect of the issue is how accurate are your piping Loads :-) I am going there.
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Best Regards,
Mandeep Singh
CADWorx & Analysis Solutions
Hexagon PPM

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#27528 - 05/19/09 05:16 AM Re: WRC107/WRC297 Doubts [Re: Mandeep Singh]
gipb4u Offline
Member

Registered: 05/18/09
Posts: 24
Loc: mumbai india
Dear All,

Which WRC bulletin incorporates the stress analysis of reinforced nozzle ?
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P08IP708

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#27530 - 05/19/09 05:29 AM Re: WRC107/WRC297 Doubts [Re: gipb4u]
gipb4u Offline
Member

Registered: 05/18/09
Posts: 24
Loc: mumbai india
Also which WRC is applicable for nozzle in conical head ?
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P08IP708

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#27539 - 05/19/09 07:39 AM Re: WRC107/WRC297 Doubts [Re: gipb4u]
Mandeep Singh Offline

Member

Registered: 12/15/99
Posts: 600
Loc: Houston, Tx, USA
You may want to check this site,

http://www.forengineers.org/pvrc/

_________________________
Best Regards,
Mandeep Singh
CADWorx & Analysis Solutions
Hexagon PPM

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#29596 - 08/29/09 06:37 AM Re: WRC107/WRC297 Doubts [Re: Mandeep Singh]
Hirak Offline
Member

Registered: 06/08/07
Posts: 18
Loc: Raipur, CG, India
Can we use width of reinforcement pad larger then limit given in UG-40 of ASME, for Local Load Analysis as per WRC107.
_________________________
Hirak R Gayakwad

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#29597 - 08/29/09 08:31 AM Re: WRC107/WRC297 Doubts [Re: Hirak]
Mukesh Offline
Member

Registered: 11/12/06
Posts: 125
Loc: Ahmedabad, Gujarat, India
Yes Hirak,

You can use higher width pad, but for good results your pad size in design shall be such that you remain in curve value limitations of WRCB-107 graphs.

Mukesh

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#29828 - 09/07/09 06:03 AM Re: WRC107/WRC297 Doubts [Re: Mukesh]
pktmurugan Offline
Member

Registered: 10/15/07
Posts: 43
Loc: INDIA
what are all the piping load cases are included in your WRC analysis? please listout the same.

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