Hi,

Iam looking for modeling of an Inline Pressure balanced expansion Joint in Caeser 2.Kindly share the steps with Snap shots.

Thanks and Regards
Vineeth Velayudhankutty

I would suggest starting here.
http://65.57.255.42/ubbthreads/ubbthreads.php?ubb=showflat&Number=57166

Thank you for the reply..But many of the links are not available.Kindly provide if you have any document which showing step by step procedure for the modeling.
Is there any tied Single expansion joint which allowing axial compression & restricting extension(To avoid Pressure thrust effect)?
So i can replace Inline Pressure balanced EJ with the above.

Have you checked the applications guide that came with CAESAR?

On the main window of CAESAR, click help>applications guide. All these types of expansion joints are laid out, starting on page 74 of the English guide.

Caesar user guide can be referred. Model for rods as rigid elements with infinite stiffness. Tie rods should be modelled with cnodes.Try to get stuff from others if not I shall send you snap shots.

Yes and no. It is better to model the rods in general as solid pipe with correct temperature. CAESAR II is very clever and will then calculate expansion under load and thermal.

There is one thing that CAESAR II cannot calculate properly is the deflection of the rod connection. It is possible to do some FEA and then include the result into the model. Using spring rate if I am not mistaken. (There is no such thing as rigid)

In over 20 years of expansion joint design I have had two cases where the rod strain (lateral compensator) or the deflection of the rod fixing point (axial pressure balanced) had material impact. The first case was due to CAESAR II analysis and the second was replacement job. Deflection on the old unit was more than the expansion joint movement. Looking on internet I see many suspect expansion joint designs.

So if you have critical application (rare) better to do the modelling properly just in case. If you need to limit deflection or strain you need to give max values to the expansion joint designer. On hot lines you may have to specify rods to be outside the insulation.