Hi,

Can you please include the gasket reaction load HG in the calculation of Appendix Y flanges? Not all App Y flanges have soft, self-sealing gaskets. The code calculations already include the gasket moment, so implementation should be straightforward.

If this change will not be made, then the software should make it clearer that the gasket loads are set to zero in the calculation regardless of the m and y values entered by the user.

I have found that the Appendix Y flange calculations are not correct when using CodeCalc (most current build). For instance, in the input echo the value of y that was specified by the user is not used in the calculation.

For example:

Here are my specified values

Gasket Factor, m, M 3.0000
Gasket Design Seating Stress Y 10000.00 psi

Here is the calculation

Gasket Seating Bolt Load[Wm2]:
= y * b * PI * G + yPart * bPart * lp
= 0.00*0.2500*3.141*10.500+0.00*0.0000*0.00
= 0.000 lb.

y has been set to zero even though it is specified as 10000.00 psi.

Also, the capital letter Y is specified as a factor involving K from (2-7.1) the lower case letter y is the gasket or joint contact surface unit seating load.

Does anyone else agree with this error?

Thanks
Matt

Hi folks

In Appendix Y of ASME Section VIII, Division 1, there is as symbol Hp in the nomenclature. That indicates that the m and y gasket factor are included in the analysis. Strictly speaking it is therefore correct to say that there is a gasket force in some instances.

In CodeCalc, we have assumed a self energising gasket is employed, as the flanges have a metal to metal contact. In the code, paragraph Appendix Y-1(b), the gasket reaction is discussed. But, metal to metal flanges primarily employ self energising gaskets.

We are going to discuss this issue internally to see of CodeCalc can be changed to accommodate a gasket load.

Thanks for your input Ray.

Since you have assumed a self energizing gasket in the programming of CodeCalc why do you allow for user input of m and y? If they are not to be used can they be "grayed out" so as to not confuse the users?

Thanks
Matt

I know about that, and that is the reson why we are going to discuss it with the PV Elite group.