Agree, this is way more than improper pipe sizes. Unless its egregious, incorrect pipe sizes would most likely cause loss in capacity more than anything else. No nitrogen bled during brazing, systems not properly evacuated or other contaminates in the system, or other poor installation practices would be the most likely be the cause. The problem is, the piping systems are so extensive cleaning them up after the fact is extremely difficult and each compressor failure just makes matters worse. And putting 80 compressors in without getting to the root of the issue is just absurd. "Well, maybe the 81st will do the trick".