Hi ,
You should use the service of company familiar with very high or ultra high pressure pump (1200 bars) to remove your ceramic ball . This will work for sure . Good to visualize the location of the blockage with an endoscope .
The only real risk with the plugged tubes is that the increased flow rates may cause more erosion.
If the ball is actually in the ubend then you may be out of luck. The ubend portion is oval and they may not be able to build enough pressure to dislodge it.
This underscores a learning lesson that most of us already know. In some situations big balls are needed to solve problems, while in other situations they just unnecessarily create problems. In situations where the latter is true (as is the case here) it's usually very difficult to undo those problems.
I have watched guys use air to slam a carbide ball down a tube in order to break up an obstruction. It might work and it might not.
You could always weld a small bar across the opening of each tube in order to prevent that.
@georgeverghese (Chemical) - Kindly advise on how to contact you privately (drop some clues, LinkedIn profile, etc.). I really need to pick your mind on a compressor issue.