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Section E.6.1.4, API 650

Section E.6.1.4, API 650

Section E.6.1.4, API 650

(OP)
I noticed that the coefficients on the equations for Ni and Nc have changed between Addendum 4 of the 10th edition and the 11th edition.  Does anyone know the reason for the change and what effects the changes have on the calculated loads?  

Also, in equation E.6.1.4-4B two new variables are included in the equation.  They are Cc and S.  I can not find where these are defined.  Are they in there and I am just overlooking them?

RE: Section E.6.1.4, API 650

Sounds like an inquiry to API would be in order on this one.

RE: Section E.6.1.4, API 650

If the values are correct it will increase the combination stress from seismic and liquid. I asked API this question along with several others on the seismic and was told that there are corrections to these coming in the Addendum 1 to be released in January.

RE: Section E.6.1.4, API 650

January of which year?  API is notorious for missings schedules bigtime.  My guess is January 2009!!!

Joe Tank

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