If we make Z axis vertical in global co-ordinate system.

When we want to analyse nozzle loads as per API 610, it asks the direction cosines for pump centreline and also has an option to indicate whether z axis is vertical or not.

Whats is the correct way to put direction cosines and other information in the input form, if my pump centre line is in x direction and the discharge nozzle is dx= 300 mm , dy = 0 and dz = 500 mm as per global coordinate system of piping input drawing.

I am asking this as the global forces when seen in equipment report, the directions of nozzle locations, forces and moments are changed with respect to global directions.

Back in the old days, API-610 and CAESAR II used a right-handed coordinate system with the "Y axis" vertical.

Then, in the 8th Edition if I remember correctly, API-610 changed their coordinate system so that the "Z axis" is vertical. So we changed our API-610 module to perform this coordinate transformation when you click the [Get Loads from Output] button.

Then, in Version 4.30, we added the capability for users to define which axis (Y or Z) was vertical in piping jobs. As a result of this change, you will find the "Z axis vertical" checkbox in a number of places in CAESAR II.

So, for your API-610 analysis, if your piping was analyzed with "Y vertical" you don't check the "Z axis vertical" checkbox, and CAESAR II will perform the transformation. If your piping was analyzed with "Z vertical", you should check the "Z axis vertical" checkbox, and the loads should come straight across without any transformation.