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#38026 - 09/22/10 11:48 AM WRC-107 - Clip Calculation
Guilherme Offline
Member

Registered: 07/21/10
Posts: 4
Loc: Araraquara, São Paulo - Brazil
Hi.

I have a doubt about the PVElite Clip Calculation, using WRC-107.

I performed a calculation using the following parameters:

Type: Retangular
C11 = 26.5mm
C22 = 565.00mm

Vessel Thickness = 12.5mm / corrosion = 3.00mm

Gamma = 121.87


At the beginning of the calculation report , the program accuses a note, that when considering figures 3A, 3B, 4A e 4B, the curve value was exceeded.

I performed a manual calculation and the results were pretty close to calculated by the program, without any extrapolation.

So, the question is: "what indicates the note accused by the program" ?

I figured out that when it calculates the relation beta1/beta2 or beta2/beta1, the results are out of the range determinated in the tables 7 and 8 of WRC-107 bulletin.

This could be a problem? Do I have to make another consideration to correct this, like a FEA, or just considering loads multiplied by a safety factor I can assure that the equipment will not fail?

Best regards,

Guilherme


Edited by Guilherme (09/22/10 11:52 AM)

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#38028 - 09/22/10 01:29 PM Re: WRC-107 - Clip Calculation [Re: Guilherme]
Luis Sanjuan Offline
Member

Registered: 08/19/08
Posts: 87
Loc: Houston,TX, USA
Hi Guilherme,

If you are outside the range of graphs, then the results will be less accurate.

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

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

You may also want to check this site,

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


Edited by Mandeep Singh (09/23/10 07:59 AM)
_________________________
Best Regards,
Luis Sanjuan


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