My point was that the addition of Mu. to every restraint variable leads to unstable iterations,
when it can be argued that the pipework movement in any other direct apart from opposing gravity is non consistant due to vibrations etc.
Still, some good points.
Now in response to the above comments, we ensure
especially during designs involving nozzle loads that a non friction run is done. But how do we asses that phenomenom of stiction? In most cases running to a nozzle, the nozzle loads are dependent on the friction factors staying low.
Do(should) we assume that pipe shoes are able to lock up???