Gasket Effect In Piping Stress Analysis

By pretending its not there....

Its considered in the normal way. Why? How do you want to considerer a gasket?

Flange joints with gaskets are considered as rigid as pipe in calculating the stresses.

Thanks all,

I am in a conclution that no need to consider the gasket compressibilty effect in pipe stress analysis at high temperature.May be because during the design phase of flange joint we are considering the required bolt load is the highest of bolt load required at these two.

1 operating conditions.

2.Installation .

So means no more futher compression of gasket at high temp.Also I asked the same question in Inetrgraph CAESER-II Forum too, the respose was caser -II also not considering any such gasket effect.

Thereby considering flange joint as rigid in the analysis will give reliable results.

Regards

Subsequent to Diameter of Gasket load reaction, G, appreciate if someone can let me know the reason of multiply by 2 for both gasket's width and bo as to determine the G value. What is the original formula? Is that:-

G= Gasket ID + (2 x gasket width) - (2 x bo)

As an example, in "guidebook for the design of ASME section VIII pressure vessel", chapter 4, example 4.5:-

It was given that, G = 13.75 + (2 x 1) - (2 x 0.3535)

Thanks in advance!

Dear All,

Nice to meet you all.

I do agree that we consider gasket as a part of flange itself while modelling considering it's not there, it being a packing element.

Whereas we do take care of flange leakage by Kellogg's method/NC 3658/ASME Sec VIII methods by checking the bending stresses at the flanges which could inturn lead to damaging effects on gaskets. Based upon Axial stresses & Bending Moments.

Regards,

Amit Dewan