@somethingnew If both pipes are welded to the baseplate, then do not change bonded contact to frictionless. You would simply apply an upward force on the top face of the inner pipe.

@peteroznewman, Thanks a lot for your response! But my contacts are not welded, they are bonded together i.e. press fitted. So should I change the contacts to frictionless in this case?nThanks in advance n