dear all,

Here I modeled some pipe systems based on a wrong local coordinate which do not comply with the the right hand rule.I do not know if the different local coordinate will produce the different stress and loads. Not only the direction of loads,but also the magnitude.Can somebody throw some light on this query.
Any response will be great appreciated!

There is a big discussion on local / global coordinate systems in the Technical Reference Manual. See Chapter 6 - Technical Discussions, the last section - Local Coordinates.