Section E.6.1.4, API 650

[sme75]

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?

 

[JStephen]

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

 

[jaydees]

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.

 

[JoeTank]

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

Joe Tank