Our wet gas compressor is tripping by vibration. We checked outside and opened bearing etc and they were OK. We are thinking that it would be ammonium salts on the second stages. In the past it happened. To solve it we wash the gas compressor second stages with injecting water in the entrance gas pipe of second stage in order to overflow to outside second stage by the exit gas pipe and move the wheel very slow. After we drain the water. We do this at least twice time. In the past solve this problem and the vibration was reduced. Of course, the sealing and lubrication oil is keeping running. What is the refinery experience about that ? How do they solve this problems (ammonium salt in the gas wet compressor) ?